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  #11  
Old 04-24-2019, 09:31 AM
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Have you ever checked the fuel pressure. Constant lean condition if not vacuum or MAF related is likely plugged injectors or low fuel pressure.
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Old 04-24-2019, 09:53 AM
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is b) replaced MAP supposed to be "replaced MAF"?

^Edit: As Andrew states could be fuel pressure. The FPR is known to go bad from time to time. Not super common, but I've seen it happen.
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Old 04-24-2019, 03:26 PM
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at this point i think the options are as follows:

fuel filter, fuel pump, injectors, catalyst...it has to be one of these
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Old 04-24-2019, 08:04 PM
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Sorry my bad, yes I meant MAF. In addition, I missed stating a few other repairs:
dd) replaced fuel filter - not resolved
ddd) added 2 rear O2 foulers (sp?) - not resolved. Since they didn’t do anything, I took them off.
dddd) replaced again 2 new front O2, instead of Bosch, I used Denso. Short lived, the light went off for 1K+ miles then went back on and off
So yes, at this point , I haven’t touch or check these items: fuel pressure, fuel pump, fuel injectors, and the cats. I read from a couple places stating that checking the fuel pressure on our car (3.0 M54) , for some reasons, is not as simple as just attaching a gauge to to a valve in the fuel line? Could someone please tell me the correct procedure?
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Old 04-24-2019, 09:10 PM
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Code 235 / P1092

Fuel pressure at the rail under the engine cover. It's a valve just like car tire. There are adapters to use with fuel pressure gauge. I use a cheap tire pressure gauge with a dial. I did once with a digital gauge but some seal inside apparently disolved so it died later.

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Old 04-25-2019, 02:26 PM
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After replacing your O2 sensors did you recalibrate your DME and reset your adaptations? I had replaced my sensors and after a little while I started getting a CEL light whcih would come back when reset. I recalibrated and cleared adaptations. Light went away and has been gone since.
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Old 04-25-2019, 07:50 PM
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Hmm, recalibrate DME? the mechanic who reset my fuel adaptation told me that he also “cleared” a few others codes... sorry, can’t remember what DME stands for? Does the DME calibration a different thing and required a different/specific processes?
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Old 04-25-2019, 07:52 PM
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Code 235 / P1092

FPR and fuel filter one in the same. (Well technically they are different but on e53 they are in the same assembly).

@tn52: are you running rich or lean? My car has been running lean for a while. I get a good long reprieve if I reset adaptations but the fuel trims are showing a story as well as the post cat O2 sensors. I'm getting too much air or too little fuel.

Low fuel pressure or vacuum leak or bad MAF are the main reasons, clogged injectors or crappy quality O2 sensors next on the list.

I'm going to do an explosive vapor intake test (where you pump propane or starting fluid etc. near intake parts and watch the real time fuel trims. Get a rich spike you found the vacuum leak)
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Old 04-25-2019, 08:34 PM
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Quote:
Originally Posted by Tn52 View Post
Hmm, recalibrate DME? the mechanic who reset my fuel adaptation told me that he also “cleared” a few others codes... sorry, can’t remember what DME stands for? Does the DME calibration a different thing and required a different/specific processes?
I think it's also called the ECM, the engine control module. Recalibration is a different process than "clearing codes". Clearing adaptations is also a different function.
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Old 04-25-2019, 09:22 PM
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Code 235 / P1092

DME and ECM are the same.

DME digital motor electronics
ECU engine control unit
ECM engine control module
PCM powetrain control module

All mean the same thing.


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