Misfiring Problem With R34 Gtt... Any Ideas?

[Alien]

Hey guys

My r34 has been fooling me around a bit for past 2 weeks or so. First it started off misfiring after about 4000 revs. It was like that for a week or so and then the other night, it was misfiring right after 2000 revs and was barely driveable. In fact, I had trouble starting it then left it for about 10 mins and barely was able to start it and take it home.

Can anyone provide some advice so I know what to look for? Is it the coilpacks? Maybe spark-plugs (never been changed)? AFM? Crank angle sensor? anything else possibly?

Thanks guys and all feedback is much appreciated as I need to know what it could be as my mechanic mate is not really too familiar with lines.

[abu]

My cousin had the same problem on one of his car's, Toyota Aristo.

We changed the plugs and it was ok, but still miss firing, on the way to the petrol station the fuel pump actually died.

Do your fuel pump prime at all? Fuel pump failure is generally caused due to old age, or running the petrol level really low, below 1/4 tank usually.

Check if the fuel pump primes when you turn the ignition, if that doesn't work then its your fuel pump.

If it does actually prime, then it could be your spark plugs, or a number of things such as your AFM, blocked injectors coilpacks etc..

Hope that helps.

Thanks,

Abu

[toffy]

afm and fuel pump are usually the culprits. also could be your water temp sensor

[R34NRG]

have u in any way screwed around with ur BOV?

[Alien]

have u in any way screwed around with ur BOV?

nope... i blocked the vacuum line from bov over a year ago (to flutter) for a period of one day and then set it back and have never had any problems with the car until just week or so ago.

hmmmmm any1 got any more concrete suggestions?

[Alien]

bumppp

[TTT]

Do the free things for a start.

Clean AFM

take out spark plugs and see if they are completely farked.

If so, spend $30 for a set of new COPPER spark plugs.

if you still have problems, look at replacing the fuel pump and fuel filter.

[Howie]

Can anyone provide some advice so I know what to look for? Is it the coilpacks? Maybe spark-plugs (never been changed)? AFM? Crank angle sensor? anything else possibly?

I'd be looking in the following order

1, coil packs and/or power transistor

2, spark plugs

3, afm

4, cas

I've had all of the above problems on every nissan i've owned - to me it sounds more like a coil pack and/or power transistor than an afm problem (but just in case, check for filter remnants or gunk on the afm and give it a good electrical contact clean for safe measure.

If it's the cas, your timing will change frequently, check with a timing light. Or if you're inclined take the cas out and check for wear on the spindle.

Edited August 21, 2007 by Howie