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Hi guys...newbie here. I have a 92 SER that is basically stock minus Exhaust and K&N conical.
We just tuned my car up with new NGK V power plugs (.040" gap) and new "Autozone" dist cap and rotor. I have fairly new Accel wires on the car as well as an Accell coil (on there when I bought it). It had a miss around 3000 and up when you stand on it, so I figured the tune up would cure it. Well it did for a few days it seemed and then all of a sudden its back but worse! Now it stumbles off idle and misses bad during acceleration... BUT it only seems to do this when the engine is hot and its really warm outside. When cold it runs fine. Any ideas???
Thanks! and great site!
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1992 SER
Stock with 2 1/4" Exhaust and Apexi Muff.
Do the MAF's really go bad like that? I didn't think there was much to go wrong but the two heated wires... any ideas where I can get one and how much?
What really confuses me is that it appears heat related... it only happens after the car is nice and hot... I was thinking the distributor or maybe the ignition module?
MAFs are NOT cheap, not if you buy them new at least. they pop up in the classifieds once in a while for roughly $75. You can just test your maf by checking the voltage output based on airflow.
Find someone that has some stock wires to try out. With high heat, the electrical resistance of wires increases, which would cause less spark, and maybe misfires.
Might want to pull the plugs and see how they look, or gap them down. Bad plugs can cause a miss.... or bad distributor and rotor...
get factory ignition stuff, dist. cap, rotor, wires and ngk plugs gapped to factory specs.(.025 is pretty narrow for n/a) you can't beat them. i've seen aftermarket dist. caps cause mis-fires on different cylinders at different times! (made it interesting to track down to cap) and it was a new cap also. you can probably get everything for less than a new MAF. good luck.
On a cold engine push up on the egr valve if the engine sounds like it does when your driving and its missn chances r all but one egr ports r clogged causing a misfire on that cyl. bet its num. 1cyl. Then again do you have egr still?? Just a thought
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SR20 1320 Racing
SR20DEN Up N runnin 1.64 60ft 11.8@119 Direct progressive 50SHOT 1ST,2ND-100SHOT 3RD,4TH
ALLNITROUSENTRA
and a little bit of compression
Be an innovator not a replicator My Nitrous Monster
Well, I gapped the plugs down and took it out tonight, it seemed much better, it pulled all the way to redline without a miss, but when it got warm, it was still missing down low..at light throttle 2200rpm or so. But it was also cooler tonight (around 80*) and when it does it worse is in the middle of the day which is 90+ degrees..
Could you go into a little more detail on the EGR problem? I really don't even know where its at..I assume its still on there. The only thing I have disconnected is the air pump for smog..cause it made so much damn noise..
Your O2 sensor could potentially be bad or contaminated with carbon build up, etc. This will cause low-end power loss around the exact same rpm range you are experiencing.
Good luck.
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Brandon
'02 Maxima SE 6MT
'96 G20 (SOLD)
I just read all of the info on the EGR over on se-r.net....I think thats my problem. I am going to try disconnecting it tomorrow to see if that solves my problem.
Thanks so much for all the help guys! You really helped a newbie out here!
I just read all of the info on the EGR over on se-r.net....I think thats my problem. I am going to try disconnecting it tomorrow to see if that solves my problem.
Thanks so much for all the help guys! You really helped a newbie out here!
You can try the 5 cent fix. Take the egr tube out of the manifold and put a nickel in the manifold then reinstall the egr tube this just bypasses the entire egr system. Good for drivability bad for emissions testing Hope this helps.
Ok, I pulled the vacumn hose off of the EGR this morning and capped it and took the car on a 50 mile trip and it ran flawless! Seems to pull much better now and I took it all the way to 7000 without a miss! I guess it was the EGR all along.. thanks for the help guys!
