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post #11 of 51 Old 11th October 2017, 12:49 AM
Silent
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Itís rare for TPS sensor to go bad. Iíve experienced failure of the aeromotove pump when it gets hot.

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post #12 of 51 Old 11th October 2017, 02:54 AM
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Quote:
Originally Posted by Silent View Post
Itís rare for TPS sensor to go bad. Iíve experienced failure of the aeromotove pump when it gets hot.
Good point. Those little Aeromotives do tend to fail when they get hot.

--Peter
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post #13 of 51 Old 11th October 2017, 03:25 AM
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Originally Posted by herrubermensch View Post
Good point. Those little Aeromotives do tend to fail when they get hot.

--Peter
Wouldn't that explain going lean, but not rich?

Regards,
Jerry

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post #14 of 51 Old 11th October 2017, 03:41 AM
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Quote:
Originally Posted by gsfent View Post
Wouldn't that explain going lean, but not rich?

Regards,
Jerry
Probably correct, Jerry. But could be functioning erratically when hot.

--Peter
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post #15 of 51 Old 11th October 2017, 10:46 AM Thread Starter
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I could try to get back to the original fuel pump but because it's runnig rich and not lean makes me think the fuel pump is not a problem. I'm going to replace the fuel pressure regulator first, although I can't explain myself how a bad regulator or something bad in the fuel system at all could cause running rich irregularly? When the FPR fails it not regulates the fuel pressure correctly and makes more fuel to pass than it should be, am I right?

The only one constant is the problem appears after similar RPMs every time.

Anyone has an idea what else from mechanical side would be good to be replaced?

Last edited by nosferau666; 11th October 2017 at 11:18 AM.
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post #16 of 51 Old 11th October 2017, 04:24 PM
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Quote:
Originally Posted by nosferau666 View Post
I could try to get back to the original fuel pump but because it's runnig rich and not lean makes me think the fuel pump is not a problem. I'm going to replace the fuel pressure regulator first, although I can't explain myself how a bad regulator or something bad in the fuel system at all could cause running rich irregularly? When the FPR fails it not regulates the fuel pressure correctly and makes more fuel to pass than it should be, am I right?

The only one constant is the problem appears after similar RPMs every time.

Anyone has an idea what else from mechanical side would be good to be replaced?
Unless I am not reading your graph correctly, it looks like it is running rich AND LEAN. There are two "spikes", one up and then one down. So it looks like it goes very lean (upwards spike) , then very rich (downwards spike). Perhaps it is the lean condition causing the problem? When it goes so lean, the computer is overcompensating and you get the momentary richness until the computer catches up? (remember, no O2's online during WOT). Computer should really react faster though. Can you hear any noise when it goes lean? Any knocking?

Since it happens at a certain rev range, I keep thinking less fuel pump/FPR and more CPS/Vanos. Something that causes a running change. Cam timing would do that. Have you run the Vanos test on the computer?

Regards,
Jerry

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post #17 of 51 Old 11th October 2017, 04:48 PM Thread Starter
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Quote:
Originally Posted by gsfent View Post
Unless I am not reading your graph correctly, it looks like it is running rich AND LEAN. There are two "spikes", one up and then one down. So it looks like it goes very lean (upwards spike) , then very rich (downwards spike). Perhaps it is the lean condition causing the problem? When it goes so lean, the computer is overcompensating and you get the momentary richness until the computer catches up? (remember, no O2's online during WOT). Computer should really react faster though. Can you hear any noise when it goes lean? Any knocking?

Since it happens at a certain rev range, I keep thinking less fuel pump/FPR and more CPS/Vanos. Something that causes a running change. Cam timing would do that. Have you run the Vanos test on the computer?

Regards,
Jerry
The uploaded graph is random - just one from many while we were still in the tuning process. I've got graphs without runing lean, we were able to fix it but running rich is most of the times and that's what interferes us to do a final tune.

We've done vanos test recently but looks like will need to do again just for double check.

Last edited by nosferau666; 11th October 2017 at 04:50 PM.
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post #18 of 51 Old 11th October 2017, 09:39 PM Thread Starter
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post #19 of 51 Old 11th October 2017, 11:34 PM
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Quote:
Originally Posted by nosferau666 View Post
Guys what would you recommend - a stock fuel pressure regulator or aftermarket one (AEM, Aeromotive, etc.)?



Stock should be fine, but if you want to upgrade, I strongly recommend Weldon. Have to ensure you install one that can handle the 5 bar (72.5 psi) fuel pressure employed by the S62.


--Peter
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post #20 of 51 Old 12th October 2017, 03:04 AM
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Guys what would you recommend - a stock fuel pressure regulator or aftermarket one (AEM, Aeromotive, etc.)?
I use the Fuelab 53501. No issues.

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Last edited by Bimmerbear; 12th October 2017 at 03:06 AM.
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