Fuel Pump Prob...any Suggestions

[mosyslack]

I have a 89 325i. At 1750RPM the engine sputters, and will not accelerate above 2000RPM. The check engine light came on at idle, and I ran the code checker. No codes poped up, so I assume that there is no electronic prob. Does anyone have any suggestions, ideas, have you experienced this before?

When I bought the car two years ago, a shop said that the fuel pump was a bit on the low side for output pressure.

Thanks for the suggestions.

[BMWJNKY]

Well I'd go with the shops sugestion and do a fuel pressure test. You should have arround 40psi at idle give or take a few psi. If it is on the low side I would try putting in a new fuel filter if it hasn't been done recently. Recheck the pressure after that and if it is still low you may have to bite the bullet and buy a new pump. If the fuel pressure is really high you either have a cracked vaccum hose going to your fuel pressure regulator or the FPR has a broken diaphram. Another thing to check is the connector to the AFM. If it is dirty or loose the car won't want to run right and will throw a "soft" check engine light.

[idanity]

what is the "AFM" that could be dirtly or loose, my 325i conv. is hesitant at times and sputters when driving normal...starts fine, drives good, but still sputters,,, i left a new post Nov.23rd 2004 and hope i can fix it..

but what is this...AFM ?

thanks...

[detour54]

Originally posted by idanity@Nov 23 2004, 05:34 PM

but what is this...AFM ?

thanks...

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It stands for the Air Flow Meter.



It sits on top of your air box.

[idanity]

ofm=airflometer...okay thanks...

i am amazed with all the info here... how can i post pictures...inside the messeges as you have..?

i would like to post some nice things ive created for the 325i series.

and i just started the HOT SOAK and should be done in 53 minutes...

im also having a studder/hesitation/ problem with my 325i conv. ..

[detour54]

Originally posted by idanity+Nov 23 2004, 08:20 PM--><div class='quotetop'>QUOTE(idanity @ Nov 23 2004, 08:20 PM)</div><div class='quotemain'>ofm=airflometer...okay thanks...

i am amazed with all the info here... how can i post pictures...inside the messeges as you have..?[/b]

No problem. In order to post pictures, you need to surround the image url by [img] tags.



<!--QuoteBegin-idanity@Nov 23 2004, 08:20 PM
im also having a studder/hesitation/ problem with my 325i conv. ..

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[/quote]

Try giving your ICV (Idle Control Valve) a cleaning.