Intermittent miss fire/loss of power??

[320stu]

My 1990 320i se seems to have developed an intermittent miss fire/loss of power? Its happend to the wife a few times and once with me.

I was driving for about 5 mins at around 45mph and felt sort of a loss of power, I pulled over put the car in netural and it was miss firing and the engine was hunting on idle after reving it? Everytime I tryed to pull away it had no power and nearly stalled, after about 2/3 min of reving from idle to about 4k and letting it idle then giving it a nother rev etc etc it was fine, I then carried on driving for another 20 mins and it never done it again? In total its done it about 5/6 times.

Any idea's guys??

Thanks

[320stu]

anyone??

[Ziggy]

Fuel pump?

[Silverfang]

Could be the ICV sticking, I've had a similar issue and it turned out to be the ICV (idle control valve) sticking and causing the engine to overfuel.

[town325i]

I would check the wiring under the inlet manifold on the engine loom side to see what the wires are like as this causes all sorts of trouble.

[320stu]

Could be the ICV sticking, I've had a similar issue and it turned out to be the ICV (idle control valve) sticking and causing the engine to overfuel.

Is this what the air box bolts onto? how can I stop it sticking? (if that is the problem!)

[320stu]

anyone?

[pac1982]

Fuel pump?

2nd that

[E30BeemerLad]

Could be the ICV sticking, I've had a similar issue and it turned out to be the ICV (idle control valve) sticking and causing the engine to overfuel.

Is this what the air box bolts onto? how can I stop it sticking? (if that is the problem!)

No the air box is bolted to the air flow meter.

I'd recommend checking the wiring plug under the inlet manifold as suggested above, also worth checking wiring to things like crank sensor to check they look in order and haven't been caught by the belts etc.

Fuel pump is another suspect. Next time it does it, lift the rear seat base and give the inspection cover on the driver side a thump and see if the problem goes away.

[stackede30]

I had this problem aswell and it was my ICV. I cleaned mines up and it worked for alil then the problem came back. Bought a new one and now it runs fine.

[Ajsingh]

I had this issue and found a very small split in one the h/t leads.... Replaced the lead, was all good.. Get water in a bottle n spray it over the dizzy cap and all the h/t leads whilst giving a bit of rev and u might b able to see a small spark seeping out of somewhere (obv dnt use shit loads of water)