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Old 01-12-2018, 12:22 PM   #1
Rcarradine
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E30: '89 325i Auto (For sale), '91 325i Coupe 5-Lug Swap, Coilovers, LSD, future M60 candidate.
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Default Sudden 'blip' on WOT

Good morning and happy Friday,

When pushing the pedal to the floor, my '89 325i has a moment of hesitation a few seconds in, then continues to power out. The check engine light goes on immediately.

Backstory:

The car has E36 green top injectors (17.5 lb I believe), adjustable fuel pressure regulator (adjusted to 36 psi (2.5 bar) to accommodate fuel feed rate through injectors on 3.0 bar rail of E30 (is that right?)). I also have a new 5.0 mustang 02 sensor wired to the E30 connector. I just replaced the throttle position sensor two days ago which appeared to have fixed the rough idle. Checked my idle control valve, and it works. All vacuum hoses appear to be in good condition. I have note checked anything with the air box.

The battery is not strong, and part of me wonders if that has something to do with it.

What do you think it could be? I'm looking to sell the car, and I would prefer to fix this before letting it go.
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Last edited by Rcarradine : 01-12-2018 at 12:29 PM.
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Old 01-13-2018, 10:06 PM   #2
lcoleman
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What's the code?
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Old 01-15-2018, 02:26 PM   #3
M20_Fever
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Are you still running an AFM? If so pop the cap and see if the sweeper wore through the contact strip. It can cause this issue. The fix is easy, just bend the sweeper arm a tiny bit to contact a new section of the contact strip.
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Old 01-15-2018, 06:17 PM   #4
superj
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Yup, i thibk somwthing with the air flow meter, also
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