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Help Please

NimAjNeB

By NimAjNeB,
in General Maintenance

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NimAjNeB Rookie

NimAjNeB

Posted
Posted

It started at engine load at first, I changed the spark plugs to iridium plugs since they were recommended to me by the dealer I purchased the car from.

The miss started shortly after I got the 3 1/2 inch exhaust added and the bleed valve. It only happened at about > 5000RPM and the misses were very close together and continuous. Since then I have tried removing the bleed value and several other solutions such as changing the plugs back to standard platinum plugs. Also tried resetting the computer several times.

Both of these solutions seemed to have helped in the short term but then the problem started shortly after once again.

I have now noticed there is a miss once the car warms up at idle but it is very intermittent, it doesn't happen all the time and the idle RPM seems to vary and not stay at a constant.

I've been wondering if it could be the mass air flow sensor? Is there a test to see if this component is faulty?

Just wondering if anyone has any ideas?

Any help or ideas would be much appreciated.

Cheers

:D

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Anguss Newbie

Anguss

Posted
Posted

Sounds like it could be the AFM (Air Flow Meter). Cheapest way to test it is to swap it with another one to see if that resolves the issue...

It's easier with a GTR as you can disconnect one or the other and it will run off one AFM and stall if it's running off the faulty one!

Ask someone if you can temporarily swap it with someone else, maybe a mate that has the same car!

Also you could try getting the O2 Sensor checked, guess I should have checked what sorta car you have before posting lol. I just saw the thread and thought i'd have my lil say :D

Good luck mate..

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Beef Community Regular

Beef

Posted
Posted

Its very very easy to check if the air flow meter is faulty, unplug it and start the car, see if it idles all over the place like it did before.... if not then plug it back in... while the car is still going.... and listen for any changes...

as soon as you plug the afm back in... if the car changes idle speed and carries on... then it must be the afm that is faulty...

very very easy....

Beef

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d00dz Grand Master

d00dz

Posted
Posted

Sounds like coils may have small cracks, and one or more of them arent working due to it? You are running higher boost and under load std parts tend to break.

Do a search on mis-fire or coils or sparks and there seems to be alot of info. :D

Check: http://www.skylinesaustralia.com/forums/in...showtopic=32356

and to test your coils: http://www.skylinesaustralia.com/forums/in...howtopic=124932

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