Need Help! Misfiring?

[cabbie_bro]

Hey all,

Just today my car went back to being it's old self, which isn't making me happy. It has started to misfire again, or what i believe is misfiring, i am worried in case it has dropped a cylinder or something bad! When the car is idling you hear a miss in the exhaust note (like a rotary/boxer effect) and the car wobbles. when you start to accelerate the wobble kinda goes away but it sounds like it is constantly misfiring. Now this has only just came back since i got the aircon re gassed (replaced condensor with 2nd hand item) and i haven't used the aircon in the car for abit over a year.

Previously i had this issue, replaced spark plugs, coil packs with no luck, but then i replaced the ignitor module (2nd hand) and after idling for about 30secs it went to normal, and it would always misfire for a while, then after about 10 or so secs of idling it would go back to normal.

Now its gone back to a terrible idle\drive and i am at my wits end with no ideas. also the tacho needle doesn't bounce, it stays steady under idle which i thought is wierd if it is a misfire.

any ideas would be great!

Thanks in advance!

PS is it still safe to drive? it needs to be driven about 30mins in total everyday (2 x 15min trips)

[Wacky Dee]

what gap are you using? My 34 was misfiring badly on 0.8mm when idle almost constant misfire on idle and up to 3000rpm .. upped the gap to 1mm and it went away.

[cabbie_bro]

Standard 1.1mm gap

Update: Reset ECU (held in brake and also left battery disconnected over night) started up perfect, did the daily drive and so far no probs.

Fingers Crossed!!!!

Edited March 19, 2009 by cabbie_bro

[Turbz RB-25]

Check for vaccum leaks, check gap in spark plugs, borrow someone's coil packs that work, check for leaks in piping.

Reset ECU as stated above.

If all that fails, take it to a mechanic for diagnosis.

[cabbie_bro]

Update:

Started car up again about 5hrs after driving, problem came back!

I am going to buy "start 'ya bastard" tomorrow and give a spray over all the joins and vacuums lines to check for splits. might also try cleaning the AAC valve although i doubt that is the problem. I had a mate think maybe ECU??

[Wacky Dee]

check your plugs see if they're in a good nick and replace if necessary .. lower the gap to maybe .8 or .9mm, this is your cheapest option. Other than that, i'd take it to a skyline mechanic for diagnostic check etc

[roosterwfyu]

did you ever solve this problem? what did you do? how did you fix it?

[defari]

^^^ check all the usual suspects. Spark plugs, coilpacks, Afm, fuel pump.

[StevenCJR31]

guys this topic is four years old and the op hasnt been active for three years!

[defari]

No shit breh