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E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #21 of 51 Old 13th October 2017, 09:30 AM
TheShafro
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Aeromotive is a such a piece of sh*t. You should replace it regardless lol

-Shady H.
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post #22 of 51 Old 13th October 2017, 03:28 PM
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DI'd you connect a fueL pressure gauge during the runs? Maybe pressure drops off. Tuner maybe adding fuel in upper bins in attempt to compensate for dropping pressure? This gives the spike rich, then when pressure collapses enough, it goes lean? ForgiVE me if you already checked this.

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post #23 of 51 Old 13th October 2017, 10:29 PM Thread Starter
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Quote:
Originally Posted by philly98540 View Post
DI'd you connect a fueL pressure gauge during the runs? Maybe pressure drops off. Tuner maybe adding fuel in upper bins in attempt to compensate for dropping pressure? This gives the spike rich, then when pressure collapses enough, it goes lean? ForgiVE me if you already checked this.
I've never but it's good to be done. Just ordered a new OEM fuel pressure regulator and then I'm going to test. I have all symptoms of a bad regulator - black smoke from the exhaust, cold start stalling and (maybe) gasoline drips out of the tailpipe but I'm still not sure about the last one. Also should check the oil dipstick and see if I can smell fuel on it.

Thanks!

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Aeromotive is a such a piece of sh*t. You should replace it regardless lol
I was pretty happy with it until three failed dyno days. If I find it causes these headaches will be replaced ASAP.

Last edited by nosferau666; 14th October 2017 at 12:32 PM.
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post #24 of 51 Old 2nd November 2017, 03:36 PM Thread Starter
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Ok guys, I replaced the fuel regulator with a genuine one but no difference. We still reproduce the problem at 50 degrees and 90 degrees air temp so I'm sure the fuel pump doesn't overheat. Also if it overheats that would cause runing lean not rich I believe.

I have no idea what else to replace from a mechanical side.

Last edited by nosferau666; 2nd November 2017 at 03:41 PM.
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post #25 of 51 Old 2nd November 2017, 04:07 PM
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Hard to start, black smoke, running rich? What about a stuck or leaking injector? I'd pull the rail off with the injectors attached, and turn the key on and see if anyone of them start leaking fuel out of the nozzle.

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post #26 of 51 Old 2nd November 2017, 04:13 PM Thread Starter
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Hard to start, black smoke, running rich? What about a stuck or leaking injector? I'd pull the rail off with the injectors attached, and turn the key on and see if anyone of them start leaking fuel out of the nozzle.

Chris
It starts up easily already. Injectors are brand new and also the issue appears just sometimes depending on something but no idea what. Today it happened in 3rd but not in 4th gear.

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post #27 of 51 Old 4th November 2017, 08:28 PM Thread Starter
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Wondering if the gas pedal sensor could be bad by a chance? I have a spare one from another M5 and considering to replace it, but doesn't look like this could cause that kind of issues. Also I have another one ECU. Does it worth to give a try?

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post #28 of 51 Old 14th November 2017, 11:26 AM Thread Starter
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My investigation shows sometimes Walbro fuel pumps cause running rich with stock fuel pressure regulators. It's possible Aeromotive to do the same. I already believe I need an aftermarket FPR... but first I'm going to test the fuel pressure.

Last edited by nosferau666; 14th November 2017 at 11:33 AM.
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post #29 of 51 Old 14th November 2017, 05:10 PM
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Quote:
Originally Posted by nosferau666 View Post
My investigation shows sometimes Walbro fuel pumps cause running rich with stock fuel pressure regulators. It's possible Aeromotive to do the same. I already believe I need an aftermarket FPR... but first I'm going to test the fuel pressure.
I think others SC cars are using Walbro and Aeromotive without issues. Most people are using the stock FPR. I know I am, although I have a different fuel setup (stock fuel pump and BAP). Focusing on a faulty FPR makes more sense to me.

Good luck tracking down the issue.

Regards,
Jerry

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post #30 of 51 Old 14th November 2017, 07:46 PM Thread Starter
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Quote:
Originally Posted by gsfent View Post
I think others SC cars are using Walbro and Aeromotive without issues. Most people are using the stock FPR. I know I am, although I have a different fuel setup (stock fuel pump and BAP). Focusing on a faulty FPR makes more sense to me.

Good luck tracking down the issue.

Regards,
Jerry
Hi Jerry,

I already installed brand new genuine FPR with no result. That's the reason I want to measure the fuel pressure next. Any tips & tricks to do it properly? Looks like the car need to be with wide open throttle.

Otherwise you are right most people use stock FRP without troubles. I just can't accept it could be a software issue and still looking for a bad hardware.

Last edited by nosferau666; 14th November 2017 at 07:53 PM.
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