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post #331 of 919 Old 31st December 2009, 01:59 AM
DouglasABaker
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Originally Posted by cmc540 View Post
Hello all. I have a 2001 540 and purchased a Peake R5/FCX-3 primarily so I could benefit from the wealth of knowledge on this board. The reader and the members on this board have helped me diagnose and correct several problems without having to visit the dealer. However, I'm now getting a couple of codes that I would greatly appreciate some help with. The codes I'm getting are:

Table OF
1D - Mixture control, idle - Cyl 5-8
1C - Mixture control, idle - Cyl 1-4
62 - Evaporative emission system purge valve

The car does idle rough briefly at cold start. This has only become noticeable the last few days when the temps dropped below 45 degrees. Otherwise, the car runs great with no indications that anything is amiss except the CEL. I'm not seeing any obvious signs of a vacuum leak, so any ideas would be welcome before I just start replacing parts. I'm not sure what the mixture control codes are telling me.

On the other problem, would the "purge valve" issue be related to the emission control air pump value (11721707619), the cover on the back of the intake manifold (11617501563) or the oil separator (11151705272)? None of these are referred to as "purge" valve on Realoem.com but I was hoping someone here could provide some info.

Many thanks!
Mixture control codes are pretty much useless. It means either you have too much or too little or either air or fuel. Reset them and wait for a real code to arise.

The evap code means you need a new PCV valve. It is a pain to get to, so I would again reset and see if it recurs. I've had it 2x in my car, but it is very intermittent and I have no intention of replacing until it is continuous or I fail emissions.

d-
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post #332 of 919 Old 31st December 2009, 02:13 PM
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I guess I'll follow your advice and wait until the car starts exhibiting other symptoms. The temperature was back up to 59 degrees this morning and the idle was smooth as glass. Thanks and Happy New Year!
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post #333 of 919 Old 6th January 2010, 05:20 PM
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I wanted to post up the Peake Codes that I was receiving BEFORE I fixed my VANOS solenoid on the driver's side. Hopefully this may help someone if you are chasing codes similar to these:

46 - Knock Sensor, Cyl #3-4
4A - Intake camshaft VANOS advance valve, Cyl #5-8
71 - Intake camshaft VANOS position control, Cyl #5-8

I also occasionally would get codes D1-D5 indicating misfires during warmup on cylinders 5-8.

After I removed the VANOS solenoids, replaced the gaskets/o-rings and fixed a bad solder joint on one solenoid on the driver's side, I no longer get these codes and don't have the rough idle and random Limp mode issues.

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post #334 of 919 Old 15th January 2010, 05:06 PM
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I just had a CPS replaced and car was fine for a couple weeks. Now I'm pulling codes AE and 90. I have cleared it a couple times and keeps coming back. Ideas?

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post #335 of 919 Old 15th January 2010, 05:31 PM
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I just had a CPS replaced and car was fine for a couple weeks. Now I'm pulling codes AE and 90. I have cleared it a couple times and keeps coming back. Ideas?
Sounds like a MAF, or a clogged air filter/fuel filter/injector.

I'd start with the filters if you are due and run the MAF test.

d-

Last edited by DouglasABaker; 15th January 2010 at 05:33 PM.
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post #336 of 919 Old 15th January 2010, 05:38 PM
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Quote:
Originally Posted by DouglasABaker View Post
Sounds like a MAF, or a clogged air filter/fuel filter/injector.

I'd start with the filters if you are due and run the MAF test.

d-
+1 - When I was getting codes 90 and AE, I replaced the MAF's and air filters and the problem went away.

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post #337 of 919 Old 15th January 2010, 07:18 PM
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My car recently failed emissions and did throw up codes

28 - “AfterCat oxygen sensor heater control, Cyl #5-8”

and

E8 - Evaporative emission purge valve functional check

I have replaced both the 02 sensor and the valve under the inlet plenum however i retested the emissions after i only replaced the 02 sensor, and it failed on excessive 02 at fast idle.

Do you think replacing hte valve as i have done now has anything to do with emissions?

Also i have the code

8F Electronic box fan

what the heck is that and where is it?
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post #338 of 919 Old 20th January 2010, 05:15 AM
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Quote:
Originally Posted by jamiepeers View Post
My car recently failed emissions and did throw up codes

28 - “AfterCat oxygen sensor heater control, Cyl #5-8”

and

E8 - Evaporative emission purge valve functional check

I have replaced both the 02 sensor and the valve under the inlet plenum however i retested the emissions after i only replaced the 02 sensor, and it failed on excessive 02 at fast idle.

Do you think replacing hte valve as i have done now has anything to do with emissions?

Also i have the code

8F Electronic box fan

what the heck is that and where is it?
It's the little fan inside your DME. It's relatively easy to change out. I replaced mine last year after getting multiple 8F codes.

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post #339 of 919 Old 26th January 2010, 12:46 AM
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Hey guys....I need some help/advice. I have been experiencing slight 'bucking' and stalling when letting off gas and car attempting to idle. This is happening in warmer weather but has gone away in colder conditions.

Here are my fault codes:

1b 49 Air mass
Af air fuel adapt bank 1 & 2
63 Control unit
91 fuel control bank 1 & 2

Any diagnosis/advice would be greatly appreciated....from what I am reading, MAF's may be the culprit? Fuel filter?

Thanks again in advance

J

------Just read back a few pages and found some info but any other input to substantiate my finds would be great. Looks like its CPS's....if so, how much am I looking at in costs? Again, thanks to all.....

Last edited by Seisup; 26th January 2010 at 01:00 AM. Reason: Read Back a few pages and found some info...
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post #340 of 919 Old 26th January 2010, 01:40 AM
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Sounds like MAFS. You can run the secret menu test, and/or do the spray-clean/disconnect/swap-sides diagnostic to confirm.

Can't speak to code 63.
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