Spark/bogging...annoying

**RedHot99T/A** · 07-15-2010, 10:22 AM

Hey im new to this forum and would like to say hey for starters.i have a 99 ls1 trans am and im have a misfire problem and i changed the plugs wires and even the coil...it had a little bit of oil on the threads not alot tho(heard thats normal?)and latly the car has been acting weird like somthing is miss alighned when get on it like it kind of boggs down,this doesnt happen all of the time tho but it seems to be progressing im at a los...ik i have a bad motor mount and im replacing them with poly mounts ik thats the cause of vibrating hoping it fixes the bogg feeling tho...any ideas?

**shady milkman** · 07-15-2010, 10:26 AM

are you sure it is a misfire ? are you throwing a code ? i would check your maf first, make sure it is clean..but i would also check your fuel system...hook a fuel pressure gauge up to the rail to see whats going on. i would also replace your fuel filter if you have not done so already

**35th-ANV-SS** · 07-15-2010, 10:38 AM

What shady said. Fuel pressure should read around 58psi.

**RedHot99T/A** · 07-15-2010, 10:46 AM

my friend has a tuning software it read 32 misfires every 100sec after replacing the plug...so it missfired more..started at 16 every 100sec(cyl3)....and i did the filter last season.nope no code eaither and i did the pressure test came out fine...idk ive tried it all...it did the same bogg down last year it was a vaccum leak...but not now all checks out...im lost and have tried alot of stuff.

**Spaz** · 07-15-2010, 10:59 AM

Originally Posted by RedHot99T/A

my friend has a tuning software it read 32 misfires every 100sec after replacing the plug...so it missfired more..started at 16 every 100sec(cyl3)....and i did the filter last season.nope no code eaither and i did the pressure test came out fine...idk ive tried it all...it did the same bogg down last year it was a vaccum leak...but not now all checks out...im lost and have tried alot of stuff.

check your plug wires to make sure none are melted...

**RedHot99T/A** · 07-15-2010, 11:07 AM

nope replced with new msd wires

**Spaz** · 07-15-2010, 11:08 AM

Originally Posted by RedHot99T/A

nope replced with new msd wires

the only other thing i can think of ATM is that maybe one of the plugs cracked when installing... i'd pull the plugs and check them out for cracks...

**Spaz** · 07-15-2010, 11:12 AM

also make sure the plug boots are on all the way on the plugs and the coil packs...

**RedHot99T/A** · 07-15-2010, 11:13 AM

ok ill do it all today...hope its simlp like that...

**shady milkman** · 07-15-2010, 11:13 AM

id start to look into the injector on #3 ...also may be time to at least crack the valve cover and make sure #3 doesnt have a really bent pushrod and check the state of the springs and rocker arms

**RedHot99T/A** · 07-15-2010, 11:25 AM

could that cause the problems im having really? if so its gunna have to wait until i do the cam swap thats been sitting there..lol...i barley have time to do anything on the poor car

**shady milkman** · 07-15-2010, 11:36 AM

i really hope it is a simple fix..i hope it is nothing internal that is causing you problems

**RedHot99T/A** · 07-15-2010, 11:40 AM

yea me also...thanks for the help man....ill keep updates on it

**35th-ANV-SS** · 07-15-2010, 01:36 PM

You never answered if you have a SES light on....

Another thought is the cats going bad. This would cause power loss and not necessarily trigger a code.

**RedHot99T/A** · 07-15-2010, 01:58 PM

Sorry overlooked that...no codes and I do not have cats on the car...full customduels.

**35th-ANV-SS** · 07-15-2010, 03:02 PM

OK then I would definitely start with the MAF cleaning. spark plugs themselves and fuel pressure.

If you have a bent pushrod you would probably here some ticking which would get louder as you rev'd the engine.

**RedHot99T/A** · 07-15-2010, 03:34 PM

Actually just finished plugs and will be cleaning the maf tonight could oil from a filter screw with it?

**Smittro** · 07-15-2010, 05:35 PM

Originally Posted by RedHot99T/A

Actually just finished plugs and will be cleaning the maf tonight could oil from a filter screw with it?

Sure can.. If you're running a K&N throw it away and go back to the cheap old paper.. The gains from the k&n are highly questionable. I've seen dyno numbers of only 1-2 hp gains and even some that were about the same as running a paper filter.. Most auto parts carry MAF cleaner, and many of us here use CRC MAF cleaner..

**rajiv1998** · 07-15-2010, 05:42 PM

Did you change your wires?? If so check to make sure they are ok. When I changed mine, I threw away the heat sheilds from the stock wires. I then installed the MSD wires and over time the wires twisted and flexed and ended up hitting my headers. It did the exact same thing you mentioned and it wasnt untill I pulled them off that I saw it was burned. Make sure you didnt break/damage any sensors.

**RedHot99T/A** · 07-15-2010, 06:05 PM

Hmmm wire are fine and I didn't know that about the filter good I asked...took it out about 20mins ago seems like a lost a lil bit of power feel laggy like I have the a/c on...idk I'm. Gunna try what all you reccomend