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about a week ago my car started hesitating real bad, now when i am driving it, even at wot, it feels like i am letting off the gas. i dont really know how to explain it, but it will run just fine, then out of nowhere it starts doing it. i just changed the fuel filter and the spark plugs and wires are only a few months old. i just cant figure out what it is. :soapbox::think::brick: if you have any ideas or questions let me know.
maybe water in the gas ???
i ran the tank out when i changed my filter, i just got back from gassing it up again, i put about 30 miles on it when i put the new gas in it. thanks for the help though.
Quote:
Originally Posted by ice97ta
if it were me b4 I did anything major I would run some fuel injector cleaner through it
i will try that, ill do it today then its getting parked until i get some more ideas.
now it seems as if it only does it when i turn right, it will do it all through straights after a right turn, then magically it will stop.
Quote:
Originally Posted by ice97ta
some other guys will see this and maybe have some other ideas .....gl
thanks
Did the injector cleaner make any difference?Quote:
Originally Posted by ice97ta
If turning just one way causes it, it seems like it is a fuel flow problem. In the older T/A's ('70-80's) they used to have a sock filter in the gas tank itself...do the new ones also? If it does, that might be the problem. They had a tendancy to get clogged, or get sucked up into the line and cause hesitation like you are feeling.
Just a stab in the dark. :goodluck:
havent been able to run it through yet, will try tonight. talked to a friend, he thinks it might be the Mass airflow sensor but i will try anything right now.
its the mass air
i sure hope your right, i ran some injector cleaner through it and nothing changed, so i am going to try the MAF now
If it does that when you step on the gas pedal then it might even be your fuel pump. That happened to me a while back it felt like if it would go dead whenever i floored it! :cry:
The dreaded opti-spark maybe??? They have a notorious reputation.
the thing is that it does it no matter how hard or soft i push the pedal.Quote:
Originally Posted by SMOKIN WS6
I would go with MAF before anything, I don't think its the optispark from my experience I feel that they only tend to hesistate like that at very high rpms not down low. However, I'm also saying that because optispark is an expensive fix and i'd try a few other things first. good luck keep us up to date.
i will definitatly let you guys know what it is when i fix it, thanks.
Your problem definitely sounds electronic in nature. Personally I have never worked on an OBD II LT1. But I did have a similar problem with my 89 GTA. I had changed the cam and went with a lingenfelter/accel plenum, runners, and intake manifold. A check engine light popped up and the code was for a burn off relay for the MAF. So I changed the relay, and not to soon after my MAF kicked the bucket. So I dropped the money and changed it. About three days after changing it I would get these sudden burst of hesitation when the car was cruising and when I held the RPMs at a constant level. The RPMs would oscillate, the worst thing was that there was no codes or engine light so, I had no clue to what was fouling out. So after checking for a vacuum leak and changing out O2 sensors, and TPI sensors I went back to the MAF sensor, went back to the parts store to find out that I was given a sensor calibrated for a 6 cylinder car. I went to a granatelli MAF sensor for a l98, a bear to adjust but a good product, and the car ran well. Honestly, I would check for a vacuum leak, and then go through your sensors, something has to be fouled up and giving the computer a wrong reading, I would even check your connection for your sensors make sure there is no corrosion in the wiring.
thanks for the insight, i will be getting a new maf tomorrow so i will do that first and see what happens
From what you're saying I dont think it's the MAF......to me I'd be leaning more towards the Opticrap. How longs it been since you did anything with it????? And since you live in a coastal city that nice salt air you have will do wonders on the opti.........take a look at that...
another vote for the opti.
I’ve never messed around with an opti spark, but in the position its in behind the water pump and the close proximity each lead has to other I can see a lot of problems. I would at least look there before spending money on sensors. But even if the its not the opti spark depending on the miles, where the car is keep and if the water pump is leaking, its probably not a bad idea to change it any way.
not to descredit that point I think that would be an excellent plan (given the pocket book can support it) optispark is pretty expensive.
I agree, I would do as much possible to narrow it down to the opti. Unfortunately it ends up being the opti many times. Worst design in the history of the sbc.Quote:
Originally Posted by Bouvs
!!! if you have a fuel pressure tester disconnect the vacuum to the fuel pressure regulator see if there is enough pressure, i know for an l98 its 42-45 psi, check see what the pressure is for a lt1. a bad regulator of pump would effect the engine at WOT.
this is the problem i just went through hell with mine because it was put on wrong. i got a new one and the car runs like a champ!Quote:
Originally Posted by SSTODD
you can totally do away with the opticrap now......there is a system out there called optidirect I think it is......elminates the need for one.......do a google search on it.....made by deltech I believe....I've seen it in GM High Performance......I'm about 99.99 percent sure it's got to do with your opti.....it certanly isn't your MAF....
i like that one, i am going to try to get it this weekend.
does anybody know someone that has used that setup before, it seems like a lot of different things can go wrong with it?
All I can tell you is there was a write up in GM about it and it said simply that it will end your opti problems forever.....basically in the end what you have is a system like the LSX motors have as far as coils and such go........if I can find the month it was written up I'll let you know........
cool thanks, ive seen other coil packs just not this one.
Hey just came across your thread and took a look in my repair manual just to see what it would say under "lacks power". Its got a nice big list of stuff for you to check:
--Incorrect ignition timing
--Faulty Distributor Cap, wires, etc
--Faulty or incorrectly gapped spark plugs
--Dirty air filter (if only that simple)
--Sparking timing control system not operating properly
--Faulty Ignition coil(s)
--Brakes Binding
--Auto tranny fluid level incorrectly causing slippage
--clutch slippage
--fuel filter clogged and or impurities in the system (obviously not since u fixed it)
--EGR not functioning properly
--substandard fuel
--low or uneven cylinder compression pressures
--Air leak at intake manifold or plenum
some of you guys are experts and such im just trying to help, hope you figure it out. I hate it when somethings wrong but you cant figure it out... good luck