Miss/Hesitation at WOT

[jtb_29]

My car just recently started missing or hesitating only at wide open throttle and only in first gear. If I stab the throttle when the rpm's reach past 4k it misses once or twice and you can hear almost a small pop or something from the exhaust. Any ideas?

1990 325i M20
-New cap and rotor
-Fairly new spark plugs
-New fuel filter

[JGood]

That's going to be a tough one. Check all your grounds. Any CEL's?

[thereisnoyun]

That's going to be a tough one. Check all your grounds. Any CEL's?

^^^. I would suggest using spare parts to test. I would test the ECU, AFM with spares to see if its having issue at WOT.

[E30_fiend]

Im 99% sure its the AFM. Do yourself a favor and find a known working AFM from an i motor and swap it out. If it solves the problem then there you go. It solved the problem for mine.





Taylor

[jtb_29]

I have a friend with an '89 525i with an m20. I'm 99% sure the afm is the same but just to make sure it would work right?

[vr2jetta]

I have a friend with an '89 525i with an m20. I'm 99% sure the afm is the same but just to make sure it would work right?

Check the part #'s.