Car goes wild at low speeds in high gear!!! NEED HELP!!

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10-11-2005, 07:15 PM
NeeD4SpeeD

Car goes wild at low speeds in high gear!!! NEED HELP!!

:brick: Ok here's my problem... Today im driving to pickup my girl and the car is running fine, no problems nothing. I come through the toll booth in 6th gear and i have to slow down. It was eairly in the morning and i was lazy so i kept it in 6th gear and decided to give it some gas to move it back up to 70mph.

Now when i did this on the way there (going through the toll booth) there was no problem it just did what it usually did hummed and took a bit to raise the RPMs and get back up to speed.

BUT!!!!! On the way back from getting her i did the SAME EXACT thing i did when i first went through the toll booth. I was in 6th gear doing 65-70 and i has to slow abit to about 35-40. So i knew i was going to remain in 6th so i just left the car in 6th and pushed the gas to the floor to get it back up to speed.

Only this time when i was doing 40mph in 6th gear at about 1100RPM my stick in the car would slam from side to side very fast and my car would backfire like crazy and also the car would jerk as if it were trying to move faster but wasn't able to. I have NO idea what this could be. I did bottom out HARD comming over the bridge because NY sucks with frigen pot holes but i checked my modifyed exhaust and no leaks, nothing wrong. Not even really a scratch. So i DOUBT that caused this problem.

Could it be the throttle at thoes low speeds in high gear?? Maybe the fuel system needs to be upgraded? Maybe it's dirty? Nothing is misfiring in the engine or anything and when i'm in 1st, 2nd, 3rd, 4th and i stop on the gas from low RPM the car has FULL power and feels perfect. Only in some parts of 5th gear and all of 6th...

DOES ANYONE HAVE AN IDEA OF WHAT THIS COULD BE???????
10-12-2005, 06:43 AM
SeVeReDiStOrTiOn

accelerating in 6th puts a big load on the motor...it's more of a cruiseing gear to get better mpg. At least down shift to 5th or get an automatic :)
10-12-2005, 07:26 AM
NeeD4SpeeD

:lmao: lol thx i'll stick with my stick but you dont believe its a problem with the car just basically i should be at WOT in 6th at 1100....
10-12-2005, 09:08 AM
Beast

I believe that's just too low in the RPM range to be flooring it... too much of a load on the engine. It was explained to me like this once when I asked this question(as best as I can remember) --> Remember that inside your cylinders the gasoline should burn as a slow wave front, and is perpetuated by the piston going down. Also remember that a cam profile keeps both the intake and exhaust ports open at the same time during a portion of the engine cycle because it's required during most of the engines operating range. So when you mash the gas at low rpm, the wave front can't form properly, so the gas starts to detonate, and at the same time since the gas is just detonating but the piston isn't going down fast enough, some of this explosion goes out the open exhaust port.

Hence backfiring and a jerky ride. :usa:
10-12-2005, 11:12 AM
NeeD4SpeeD

I must say beast that was an excellant overview of what the possible problem might be and i must give you lots of credit for it!! Thanks for taking the time to explain it to me and from my knowledge of cars i would say your probably right on point and i just over looked that fact in its entirety. So i guess that the best logical explination of the problem and thanks for the perfect explination!!! Helps also to know that my "beast" won't need to be put to sleep for awhile:lmao:
10-12-2005, 11:15 AM
NeeD4SpeeD

I did also fill up my tank with 93 from a citco gas station right before the problem happened... Could shitty gas contribute to this weird problem?
10-12-2005, 01:43 PM
DaddySS

If you don't floor it in 6th at 1100 RPM does it perform normally?

If that's the case, just don't do that!

Remember your 300 HP at 5500 RPM engine puts out about 50 hp or less at 1100rpms, think of how that makes the engine feel trying to move a 3700 pound car.
10-12-2005, 01:52 PM
91Z28

Try not to lug the engine below 1500 RPMs.
10-12-2005, 03:56 PM
02z28ls1

6th gear is your second overdriven gear-most cars only have one overdrive gear.According to the manual you don't shift into 6th until you are going at least 60 mph!And if you want to floor it-DOWNSHIFT!!!If you are too lazy to shift leave it in 5th-and don't floor it anyway.You are totally abusing that engine-I shift into 6th gear at about 70 or 80 if at all.The factory won't tell you this but the only reason it's got a 6th gear IMHO is to give the car that incredible top speed(around 170).Don't lug your engine like that-leaving that tollbooth you should downshift into 3rd-then shift into 5th-how hard is that?
10-12-2005, 04:02 PM
NeeD4SpeeD

It's not hard... I just did it this one time, not like i do it all the time. No reason to get nasty i know how to drive a car. I was just asking if there was anything wrong that the car did what it did.
10-13-2005, 10:24 AM
SteveC

Yo bro, you boggs down da motor in thats gear, like a mofo, u gots to gets it into second, daz a bitch!!!.

Peace Out.

SteveC :)
10-13-2005, 01:20 PM
02z28ls1

Quote:

Originally Posted by NeeD4SpeeD

It's not hard... I just did it this one time, not like i do it all the time. No reason to get nasty i know how to drive a car. I was just asking if there was anything wrong that the car did what it did.

Honestly I still don't think you're getting this-I'm trying to impress upon you that that IS abusive and that's not how to drive that car.It is your car and you can screw it up if you want-but to a mechanic such as myself you wouldn't believe the cringe I did reading that.Maybe some day you will understand how that kind of thing sounds to a mechanic-but I'm not so sure.You said you've done it in the past and didn't understand why it reacted like that this time -Right?So you've been driving like that.For your cars sake -stop it.
10-13-2005, 02:54 PM
NeeD4SpeeD

I KNOW what your saying... And what i'm saying is i just did it TWICE. Just both times happened to be in the same day thats how i noticed a difference. I definatly DO NOT ABUSE my car. I've been working on cars for over 12 years and learned everything i know from my father and uncle who are both master mechanics so i know pleanty about cars. I just couldnt place why since i did NOTHING different between the first time i did it and the last time i did it (which was twice total in the lifetime of my car) which is why my suspision was raised when i noticed something different.

Thats all i was saying but we pluged the car it and noticed the fuel air mix was off and running lean when i pushed it into WOT at high gear. I was told that since i dont have the O2 sims in yet and i'm still throwing a code that the cars ECU is trying to fix the problem and adjust but cant because there really is nothing wrong just that i have no cats.

I have the O2 sims comming this upcomming week and once i install em i'll re check the fuel air ratio and see if the car re-adjusts it self.
10-13-2005, 05:37 PM
02z28ls1

OK-I'm reading your last post there -and it says you're concerned about your air fuel ratio at WOT in high gear.I don't see any reason to be at WOT in high gear until I'm doing around 120 mph-seriously.Below that speed I'm going to downshift if I want to accelerate or go WOT.Your O2 sensors behind the cats are checking the performance of the cats for the purpose of emissions laws and doesn't use that info to operate the engine.If your engine is performing flawlessly except at WOT in double overdrive-you don't have any problems except how you're driving it.I'm betting you weren't going that fast when you were scanning it.It's not a diesel engine-with that much load you need at least 2500-3000 rpm before I would recommend WOT-and that would be over 100mph (at 80 mph in 6th gear you are barely above idle at 1800 rpm).I repeat-you don't appear to be getting this.
10-13-2005, 08:38 PM
TGrits10

****THREAD SUMMARY****

NeeD4SpeeD: "I lugged the living SHIT out of my engine, and it complained...is there something wrong with it??"

Everyone: "Nothing wrong with it, just don't lug it like that, jeeezz...."

NeeD4SpeeD: "well maybe it was..."

Everyone: "No, trust us, the motor's running fine, you just lugged the SHIT out of it and that's what happens"

*************

There, now it's all cleared up :D.
10-13-2005, 08:56 PM
02z28ls1

Quote:

Originally Posted by TGrits10

****THREAD SUMMARY****

NeeD4SpeeD: "I lugged the living SHIT out of my engine, and it complained...is there something wrong with it??"

Everyone: "Nothing wrong with it, just don't lug it like that, jeeezz...."

NeeD4SpeeD: "well maybe it was..."

Everyone: "No, trust us, the motor's running fine, you just lugged the SHIT out of it and that's what happens"

*************

There, now it's all cleared up :D.

:yup: That pretty much sums it up.
10-13-2005, 10:16 PM
NeeD4SpeeD

I GET IT!!! YOUR A BUNCH OF PAINS!! :lmao: j/k seriously i do and i appriciate your comments. I dont take em as being asses or anything its constructive critism and i kno everyone is just looking out for the well being of the car and if i screw up i'm glad i have people there to let me know and help me correct it. So thanks for all your help seriously and I DO GET THE POINT!!
10-13-2005, 10:57 PM
ninobrn99

damn, i could've sworn i posted in this thread!! :screwy: im losing it!
10-14-2005, 09:27 AM
02z28ls1

Quote:

Originally Posted by NeeD4SpeeD

I GET IT!!! YOUR A BUNCH OF PAINS!! :lmao: j/k seriously i do and i appriciate your comments. I dont take em as being asses or anything its constructive critism and i kno everyone is just looking out for the well being of the car and if i screw up i'm glad i have people there to let me know and help me correct it. So thanks for all your help seriously and I DO GET THE POINT!!

:haha: OK nuff said-we really were just concerned about your car-you are a good sport.
10-14-2005, 10:29 AM
TGrits10

Quote:

Originally Posted by NeeD4SpeeD

I GET IT!!! YOUR A BUNCH OF PAINS!! :lmao: j/k seriously i do and i appriciate your comments. I dont take em as being asses or anything its constructive critism and i kno everyone is just looking out for the well being of the car and if i screw up i'm glad i have people there to let me know and help me correct it. So thanks for all your help seriously and I DO GET THE POINT!!

:beer:

It's refreshing to mess with someone who sees the humor, good on ya :yup:
10-14-2005, 09:27 PM
NeeD4SpeeD

It's all good!!:lmao: Not like im gunna cry or n e thing :cry: lol Nah im a clown my self and i know you guyz are concerned 4 the car and i definatly respect that and everyone is entilted to their own opinion as well am i so laugh it up!!!:lmao: :lmao: :lmao: :lmao:
10-15-2005, 06:37 AM
345hpss

What you are describing is NOT normal, couple things come to mind:

- misfire on 1 cylinder, ie bad plug, or wire
- fuel filter
- failing/plugged cat

running the car like that puts an enormous load on the engine and all it's supporting systems. Maybe your pothole broke up a cat (inside), or you have a fouled plug or bad wire. I sometimes do use real high gears at low speeds, the car should be smooth at 40mph in 6th gear with factory gearing.
10-15-2005, 04:52 PM
02z28ls1

Dude-do you go wide open throttle at 30 mph in 6 th gear also?Did you read any of this stuff?Pleez stop!!!!!!!!!!!!!!
10-15-2005, 11:03 PM
NeeD4SpeeD

No i didnt do that..... I'm not that crazy...yea i gave it some gas but not full wide open throttle...
10-15-2005, 11:16 PM
NeeD4SpeeD

OKKKK.... Problem seems to be getting worse now i decided to open the car up in 1st gear and in high RPM i get the exact same problem.... Exhaust backfire, shifter going krazy and car jerking!!! Feels as if i'm loosing some power i dont know what the problem could be... A misfire on a cylinder??? Maybe a bad plug or wire? I think that might be possible...

I did buy a whole fuel system cleaner just incase i had a bad batch of gas and the injectors needed to be cleaned but i doubt thatt the prob! I mean now that it's happening in 1st gear going up the RPM range now i know theres something wrong and i didnt just bog the engine...

You dont think it's anything wrong with the internals do you??

I did order the O2 Sims for the true duals but i know that has nothing to do with it unless for some reason something caused the air/fuel ratio to get all screwed up because i checked and i believe its running lean but i need to check again...

Please anyone any ideas on what the problem could be?
10-16-2005, 01:19 AM
TGrits10

Sounds like spark. Pull the codes to see which cylinder, check plugs and wires. If they're fine, check the coil. If that's fine....maybe it's not spark.

I had the same problem with a different car, baffled me for the longest time because the problem kept causing other problems, which distracted me from the real problem. Turned out to be a bad coil.
10-16-2005, 05:50 AM
345hpss

Quote:

Originally Posted by 02z28ls1

Dude-do you go wide open throttle at 30 mph in 6 th gear also?Did you read any of this stuff?Pleez stop!!!!!!!!!!!!!!

:think: These cars are perfectly capable of cruising around town all day at 1000 rpm, and you know what, the amount of gas that saves is phenomenal. The point I was making is that under those conditions of high load, low engine speed, a driveability problem will be exagerated and may show up before you see it in a
"more normal" low load situation.

Obviously I am NOT crazy as Need4Speed's problem is getting worse. I stand by my statements. The car should be smooth, just not very responsive under those conditions.

Could be spark, could be fuel, could be exhaust. All of those things would cause his problems. A dead cylinder will definitely give him the vibration he is talking about. Plugs, wires, coil packs should all be checked. A plugged up cat would definitely cause these problems too, and I point that out only because he mentioned bottoming out the car just before this happened.
10-16-2005, 07:01 AM
02z28ls1

Slow down a minute and reread the first post-he's doing 35 in 6th gear and he floors it.I repeat-your nuts if you drive a car like this -like that.If you want better gas mileage get a rice car-if you want to lug a motor like that drive a tractor.This is not a diesel engine-don't drive it like that.If you don't get this I'm not going to be able to explain it to you-you don't understand what's going on.Notice how his description of the problem has changed-now he has a problem-but did the problem start after he lugged the shit outta his motor,could be.You can't diagnose this over the internet-codes need to be read -stuff needs to be checked.Convertors rattle if they are breakin up internally and you will have a choking effect on the exhaust-it will set a code also.What kind of things would happen from lugging the motor?Detonation could screw up the spark plugs for example-lugging the motor damages the engine bearings also.The electronics will try to limit the damage by pulling out timing and the knock sensors in particular will be your best friend here but why not drive it different ?Gas mileage-not what you are concerned with at WOT!At 35 downshift to 3 or 4 if you want to gun it-it has to do with the characteristics and design of this motor and gas engines in general.I'm not going to try this to find out but I'm betting it was not running at 1100 rpm at 35 mph in 6th gear-I believe it was at idle speed or less.Gas engines need rpm to avoid damaging stuff.Again-6 th gear doesn't need to be used below 60 mph and if you want to accelerate at all-Downshift!!!
10-16-2005, 07:28 AM
NeeD4SpeeD

Quote:

Originally Posted by 345hpss

:think: These cars are perfectly capable of cruising around town all day at 1000 rpm, and you know what, the amount of gas that saves is phenomenal. The point I was making is that under those conditions of high load, low engine speed, a driveability problem will be exagerated and may show up before you see it in a
"more normal" low load situation.

Obviously I am NOT crazy as Need4Speed's problem is getting worse. I stand by my statements. The car should be smooth, just not very responsive under those conditions.

Could be spark, could be fuel, could be exhaust. All of those things would cause his problems. A dead cylinder will definitely give him the vibration he is talking about. Plugs, wires, coil packs should all be checked. A plugged up cat would definitely cause these problems too, and I point that out only because he mentioned bottoming out the car just before this happened.

I would say that it could be a cat but i dont have any..... I have a true dual system with no cats. I'm going to check all the wires today and the sparks if i can get them out to see if anything is wrong.

02z28ls1 It was a one time thing with what i did... I understand your point of view and i will definatly downshift next time as well as i respect your point of view comming for a mechanic.

But what is goign on now with the car, i have no idea!!! I really dont want to have to rip the block apart and search for a problem. I hope its on the surface such as the wires or something. Like i said before i did order the O2 Sims for the car but wont have them till wed but i wouldnt think that would cause that problem unless maybe one of the O2's going into the headers is bad??

This shit is driving me crazy because im loosing power and car feels like crap and i hope its something simple....
10-16-2005, 07:40 AM
02z28ls1

I know-we already talked about it need4speed-I was mainly talking to 345hpss.If you bumped up the hp then drive it like the high performance car it is-they really are magnificant beasts IMHO-dont drive it like a plowhorse.Yes you do have a prob now-you can rule out exhaust then easily by looking under the car-it would have to be smashed shut to be affecting you like that.Go to the genuises at Auto Calzone and get your codes read if you can-that'll be a good start.
10-16-2005, 08:20 AM
NeeD4SpeeD

Yea i know i really need to do that.. Well i know that one of our sponsors is really close to me which is TTPerformance because i live in New York. And i know they are very good with the LS1 engine. So come tommrow i'll stop by them and have them read into the codes to see what the problem is. opefully it wont cost me much because i was planning of doing christmas shopping for myself eairly this year but i hope i wont have to wait.

I did check the exhaust out and it's in perfect condition, not bent or anything so i say we can rule that out...

Bought fuel system treatment just incase it a fuel problem b/c i want to cover all angles here...

And was thinking about buying new wires and sparks just to have an excuse to do them eairly....

But i think i'm going to do what you said and go ahve the codes checked out to determine what is definatly the problem!!!
10-16-2005, 12:05 PM
02 Blk T/A WS6

one time my car did what your discribing and it turned out to be a loose plug wire that was arching at high rpm check you plug wires
10-16-2005, 06:38 PM
NeeD4SpeeD

Quote:

Originally Posted by 02 Blk T/A WS6

one time my car did what your discribing and it turned out to be a loose plug wire that was arching at high rpm check you plug wires

LOL funny you say that because thats what i did eairlier and thats was exactly the prublem!!!! Stupid wire wasnt on all the way and i was jumping sparks!!! Go figure....

Well i just wanted to say thank you to everyone for all your suggestions and opinions and that i'm glasd it wasnt anything serious!!!!:beer3:

Thanks everyone again 4 your help!!!:beer:
10-17-2005, 03:56 PM
02z28ls1

Kool-all's well that ends well!!I just wanted to say something in closing(I can't let things go!haha) These engines will set a code for misfire and even tell you what cylinder.As complicated as these engines can be-most of the time stick to the basics when diagnosing these things and you can find 90% of the problems yourself.Finally-last nite I was on the hiway going 70 mph in 6th gear and that was 1600 rpm.Take half of that-35 mph is 800 rpm -idle speed-in double overdrive---anybody still think this is a good idea?(If you do please keep it to yourself):usa:

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