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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 08-09-2012, 09:36 PM   #1
jmill90

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91 525i

i have a 1991 525i, i do all the maintenance myself and even some of the more complicated stuff. i have run into a problem that so far i have yet to find a way to fix. the car runs good till i get to about 2500 rpm then it spits, sputters and acts like it is running on 4 cylinders. does anyone have any ideals?
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Old 08-11-2012, 01:02 PM   #2
DEATH2000
 
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Have you checked all your vacuum lines and hoses? ICV?
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Old 08-11-2012, 09:52 PM   #3
jmill90

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I didn't see anything, but i could take a lot closer look. Would it need to be a major leak?
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Old 08-12-2012, 06:52 AM   #4
DEATH2000
 
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Even a very thin crack or tear could cause idle issues.
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Old 08-12-2012, 11:47 PM   #5
jmill90

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Ok, thanks. will take a lot closer look.
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Old 08-13-2012, 09:09 PM   #6
jmill90

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I checked and replaced a ICV hose and took off and closely inspected the other vac hoses. No change. I have also changed spark plugs, coils, injectors, o2 sensor and fuel filter. I did a fuel pressure test and at idle i had 41psi. I also swapped out the check control and DME without any changes. Oh i failed to mention that the car runs great till it's been at operating temp for about 20 mins then it starts acting like it does.

Last edited by jmill90; 08-13-2012 at 09:17 PM..
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Old 08-21-2012, 10:15 PM   #7
jmill90

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thanks for the ideals. it turned out to be a fuel pump.
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