I have a pesky misfire. I replaced the fuel filter, opti, coil, plugs and wires and still cant get rid of it. I must've done something wrong or burned a wire. I did get rid of it for a few weeks when I installed my TR6s for my N2o setup. BUT its back!!!
Can someone help me out? Any tips to finding out the problem? I did notice a smell today when it started misfiring again. It was the smell similar to that of burning wood... unlike anything ive ever smelled.
Also, I recently installed TR6s... what do fouled plugs look like?
Thanks guys, tips, tips, tips!
Thank you

 

try look in teh engine compart with no lights on at night... around the headers , spark plug wires and what not... if taht dont help try to make sure no wires are burnt and if there all the way on... if not might be a opti problem...

 

Just want to add to the above comment, it has to be REALLY dark. It being dark outside with streetlights neearby or lights from houses is not dark enough. Best thing to do is use a garage at night with all the lights off..

 

Pull plug wires off while it is running. The one that has no change is your problem.

 

yes, excellent idea!
thanks guys! ill try tomorrow!

 

You might get a spray bottle and put it on stream and spray each header tube. If you have a dead cylinder at idle the water will just sit there and sizzle.

 

Another good idea. Only works if you have headers though. I do it the lazy way and spit on them.

 

You're never gona pull wires off with a stock manifold when it's running. Anyone that suggests it, never did it. I wouldn't even attempt it with headers. But then I could use my infrared thermometer to find a dead hole. Doubt you have a dead hole. If you think it's an ignition misfire, use a timing light to find it. That is, assuming it's ocassionally misfiring.

You said you have a misfire. What makes you say that? Does it idle rough? Do you feel anything when you are at speed?

I also noticed a few things in your signature. One is you have no screen in your MAF. Bad idea. Removing it gains nothing but can add to turbulence in the incoming air in turn making in-accurate metering of the incoming air. Add to that, your free ram air set up that may have a cotton filter that got over oiled and "here's your sign".

The other thing I noticed is you have not cats but did not notice you removed the EGR. The EGR valve is closed with exhaust back pressure when it's supposed to close. If you uncork the exhaust, the EGR may not be fully closing.

Just a few ideas to consider.

 

And maybe the person that has suggested it has done it. Both manifolds and headers.

 

You could unplug them from the opti.

 

I would definitely put the screen back in the MAF, but GENTLY clean the MAF wires first with spray electronics cleaner, or you can try alcohol on qtips (be gentle tho!). The reason for this is because oil from your filter can slowly build on the wires.. Also make sure that you have absolutley no air leaks after your MAF, which would cause unmetered air. I would also check your IAT to make sure that is working correctly. And the EGR as slopok said. Shoebox has some good instructions on how to check your sensors and such...