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E63 / E64 6 Series (2004 - 2010)
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Old 08-04-2019, 08:31 AM
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Mulchman Mulchman is offline
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Slow start - no start - fuel purge valve!!

I'm at 158k now. Replaced the starter a while back. Recently (past 6 months) been having slow first crank then start. Then it became two long slow cranks on first button push with no start, then fire right up on second. My IVM is only a few years old but I replaced it anyway.

ISTA said I had a dirty VANOS solenoid so I cleaned and swapped them.

It also said I had a fuel purge valve issue. I ran though the test procedure and it all checked out (including the did you hear the valve click? part). So I figured that was a ghost. I finally decide to pull the valve and pressure test it. That was it, it wasn't closing all the way. It should be closed when not under load and open when powered. I sprayed it with some WD and banged it around a couple times and then it held vacuum. I used alligator clips and a 9 volt battery to test open and close it a few times, then reinstalled. The car fired up like new and I got back all of my low end (low RPM) power, that I was missing.

Part will be waiting for me at Bimmerzone tomorrow, $80. I've been driving for the past two days and I can literally tell when it gets stuck open now. I will report back if this doesn't solve my problem, but I think I found the culprit.

Hope this helps someone. Hi Herb!!
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Old 08-04-2019, 03:22 PM
HerbP HerbP is online now
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The fuel purge valve does pop up quite often, but it is an easy repair. I have noticed that if the battery voltage is low, that the error code for it will pop up occasionally. I have not seen you around for a while, but good to hear from you!
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Old 08-04-2019, 04:05 PM
FredoinSF FredoinSF is offline
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Great info. Subscribed to thread so I can find it if / when needed.
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Old 08-05-2019, 03:06 AM
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Mulchman Mulchman is offline
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Quote:
Originally Posted by HerbP View Post
The fuel purge valve does pop up quite often, but it is an easy repair. I have noticed that if the battery voltage is low, that the error code for it will pop up occasionally. I have not seen you around for a while, but good to hear from you!
Exactly the reason I blew it off. I've seen the code come and go many times. When it came back a few times I rolled though the ISTA test and it came up fine. It does not test the valve closure for vacuum, It test the system as a whole for vacuum and checks to make sure the valve will open (listen for clicking noise). So I overlooked it again. The only way to tell it's bad is to pull it and apply vacuum.

Like I said, Vincent at Bimmerzone will have one by noon today and I will know for sure if this was my entire problem.
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Old 08-08-2019, 05:24 AM
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Well I was still getting a CPS error (bank 1 exhaust) after installing the new purge valve. I pulled it, cleaned it and swapped it with the intake CPS. Cleared the errors and she's running like a champ. No errors (so far), starting seems back to normal and low end power restored. Took less than 30 minutes. Purge valve takes less than 15 to swap.
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Old 08-08-2019, 12:51 PM
HerbP HerbP is online now
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Sounds like you were running lean, but I would have thought it would have caused Bank 2 to go lean? Smoke test is the easy to find any vacuum leaks on our engines. After any repairs to the valve covers or intake. smoke test everything before you button everything up. I simply remove the air intake, & insert a 4" drain test plug to block the port. After that pump the smoke to it, you will find your leaks very fast!
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