Car is misfiring like a mother f***er!!!
09-14-2009, 12:09 AM
#1
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Car is misfiring like a mother f***er!!! Just did a spark plug/wire change on my car and used NGK iridium plugs for the replacement plug. After i changed the plugs i started the car with the oem wires installed and the car started to misfire. I then changed the wires to see if it would stop the misfire and lo and behold it began to misfire "less" as in the car wasn't "hickuping" as much. Then i took it to a shop to see if i could resolve this problem, and they told me cylinders 3 and 4 were the culprits. However, they swapped plugs from 3and 4 to 8,7 and it still misfired in 3,4. So my question is HOW THE HELL DO I GET THIS FREAKING CAR TO STOP MISFIRING??? Any help/suggestions are highly appreciated. thank you
09-14-2009, 12:25 AM
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I just took a set of iridium plugs out of a friends ls1 that had a miss on cylinders 4 and 8 and he had changed the plugs on those same cylinders before he called me.I replaced them with a set of NGK tr55's and the miss is gone now.
Last edited by streetlegalls1; 09-14-2009 at 12:37 AM.
09-15-2009, 03:16 PM
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well for starters you shouldnt waste your money on iridium plugs unless your wanting maximum fuel economy, and i think they burn to hot anyways. change your coils around also see if that changes anything. i would stick with the tr55s you will have to change them more frequent but worth it in the end.
09-15-2009, 03:19 PM
#5
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I've never had a problem with a Stock plug, ac delco. NGK are good though, wierd problem.
u should always run same plug in all cyclinder, are u sure Plug Gap is right?
u should always run same plug in all cyclinder, are u sure Plug Gap is right?
Last edited by 01'SSLSX; 09-15-2009 at 03:27 PM.
09-15-2009, 07:28 PM
#7
Guys, I'm running Delco Iridium replacement plugs in both my LS1 and my truck's 4.8L engine for over 30K miles and 3 years now with no problems whatsoever. They may not be optimum performance pieces, but they're not duds either.
I bought 16 of them at the dealer, measured gaps and gave the LS1 the 8 best...threw the rest in the truck.
Given that the problem didn't follow the plugs when they were moved, it's likely either the new wires (whip out the Ohm-meter and check them) or something else requiring further diagnostics.
I bought 16 of them at the dealer, measured gaps and gave the LS1 the 8 best...threw the rest in the truck.
Given that the problem didn't follow the plugs when they were moved, it's likely either the new wires (whip out the Ohm-meter and check them) or something else requiring further diagnostics.
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09-15-2009, 10:25 PM
#8
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already changed wires to msd, thanks though. as for the misfiring problem, i've narrowed it down to cylinders 3 and 4. I have regapped both to 0.040 just like the others and i still get misfires in both 3,4. So 2morrow im going to try and change the coil packs on the two cylinders and see what happens. I hope this works...if not i will swith to the tr55's or ac delco for all 8 cyl as many of you have suggested...
09-16-2009, 10:02 PM
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if those are iridium plugs you shouldnt touch them with a gap tool. those are pregaped for a reason. plus i think the gap should be close to 50 on that. i run mine at .055
09-16-2009, 11:28 PM
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Sorry i was not more clear,i took it that saying a set was 8.All 8 were replaced with the tr55's.It's alway's a good practice to back up to when the concern started,was it ok before the plugs were installed?
Last edited by streetlegalls1; 09-16-2009 at 11:42 PM.
09-17-2009, 12:09 AM
#11
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Not knocking iridium plugs,good low maintenance plugs that maintain gap,just happened to be the problem with this car,fuel tables,timing,etc were moved around a good bit on this car and it did not run well with them
Last edited by streetlegalls1; 09-17-2009 at 12:15 AM.
09-17-2009, 07:00 PM
#12
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yea it ran fine before i changed the plugs, i still havn't had time to work on it but hopefully i'll get time tommorow...maybe a dumb question but do you know if its ok to drive the car around (gently of course)?? as it is my only way of getting from a to b.
09-17-2009, 07:42 PM
#13
The ole' sprak plug issue once again.
Some cars will not work with some brand plugs...don't ask me why but its a fact. Bosch plugs in my engine...it will hardly idle, much less be able to drive it away. Pull them out and put in NGK plugs in...perfect.
mvaldezss,
Swap those coils to see if the misfire follows them.
Make sure those spark plug wires (3 and 4) are not touching the exhaust manifold pipes at all. That will cause misfires.
If that does nothing:
Get NGK TR55 plugs, gap them to .050, .
.
Some cars will not work with some brand plugs...don't ask me why but its a fact. Bosch plugs in my engine...it will hardly idle, much less be able to drive it away. Pull them out and put in NGK plugs in...perfect.
mvaldezss,
Swap those coils to see if the misfire follows them.
Make sure those spark plug wires (3 and 4) are not touching the exhaust manifold pipes at all. That will cause misfires.
If that does nothing:
Get NGK TR55 plugs, gap them to .050, .
.
09-18-2009, 01:05 AM
#16
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[QUOTE=LS6427;12236914]No...misfires are horrible for an engine.
****!! i've driven it for about a week already...What kind of things could/have happened to the engine after driving it for this long?
****!! i've driven it for about a week already...What kind of things could/have happened to the engine after driving it for this long?
09-18-2009, 05:14 AM
#17
C'mon dude, change your panties, fix it, and resume enjoying your car.
I mean, really. It was running fine, you changed plugs and wires, and then it wasn't running fine. Even your average mouth-breather can conclude the right next step is to back-out the change you just made without a dozen posts about it.
09-18-2009, 11:37 AM
#20
[QUOTE=mvaldezss;12238231]
The way I see it........a misfire is like your engine ******* with you. It will fire and you'll get the combustion one time, but the next you get nothing.....but all the while fuel is always being sprayed into the cylinder. So when it does fire its going to be a lazy power stroke, then the next piston in line to fire is picking up the slack that never happened from the misfiring cy;linder....thats why the engine stumbles and lags...... or when that piston moving upward squeezes the fuel/air mixture it can and does "pre-ignite" on the way up...which is detonation. Bad for the rod bearings, it crushes them.
I think if a hard run was done with misfires you could perhaps lose the engine, in a worse case scenario. But you're not doing any good to it by driving it at all. Misfires means "imbalance", thats not good for any "V" engine.
.
****!! i've driven it for about a week already...What kind of things could/have happened to the engine after driving it for this long?
I think if a hard run was done with misfires you could perhaps lose the engine, in a worse case scenario. But you're not doing any good to it by driving it at all. Misfires means "imbalance", thats not good for any "V" engine.
.