Missfire After Timing Belt Change Rb25Det Neo

[hks33]

Hey guys,

Recently carried out the first major service in my series 2 manual stagea (25 neo) with a friend of mine. After starting the car up once everything was put back together we had noticed a misfire whilst revving the car and holding the revs then slowly backing off. The misfire would only occur whilst backing off the throttle and holding it in the one spot. Have temporarily fixed the issue by retarding the timing and adjusting the revs. The more it was advanced the more the misfire would occur and the more obvious it would become ..

I seem to think it may be the cam pulleys that weren't lined up properly but my friend says the car would not start if they were out... Car was running fine with no misfire before the service was carried out and its really upsetting me thinking something major has gone wrong and I'm going to be spending unnecessary money to get it looked at and fixed.

Any ideas and a solution to this problem, may it be the ignition timing/timing not set right or could it be the pulleys weren't lined up properly?

Looking forward to your responses.

[NYTSKY]

Timing belt skipped a tooth?

[hks33]

Hoping its not that... Would a skipped tooth result in a misfire the way i have described it or could it be the ignition timing which wasn't set correctly because we never marked where it was sitting prior to removing the CAS?

A timing light wasn't used at all during the change to set it to 15 degrees @ 650rpm.

Would the car still be running if it has skipped a tooth because it seems like its running fine now once we've taken timing out of it but i know its not good for the engine.

[Moodles2]

Go to all the trouble of doing a 100,000km service, then neglect to set the timing? The answer is obviously get a good timing light.

[hks33]

So your diagnosis would be the timing is too advanced or retarded...?

I kept thinking to myself it couldn't have been anything else besides the timing, I did insist several times throughout the change and persisted to my mate who said not to worry about it, Due to it being a "so called" waste of time.. The timing degrees isn't there for no reason

Some people irritate me, Is there any possibility the valves have been bent? Car is running almost fine but the CAS isn't lining up to the previous marks before it was taken off and getting a slight rough patch between 1,200-1,800rpm

Still not happy with it because the CAS should be in the previous position from my understanding.

Edited February 18, 2012 by hks33

[boostn0199]

Just get a light and set it you wont have any valve damage from wrong timing car will just run shit.