Fuel injector Rehab, cont'd

Phil Rose pjrose at frontiernet.net
Mon Apr 19 22:22:09 EDT 2004

At 3:45 PM -0400 4/19/04, TooManyAudis at aol.com wrote:
>Couple of other points -- brand new plugs -- in fact, did a timing belt
>change, along with plugs, cap, rotor, fuel filter and seemingly 
>hundreds of other
>miscellaneous parts as soon as I got the car -- about 1,000 miles ago or less.
>Also, I spoke to an owner of a foreign car service center (ran into him at
>the VW dealership while picking up replacement wires for a couple I managed to
>short out) and he suggested the the problem sounded more like a fuel pressure
>problem, with the most likely culprit being the check valve.  Any thoughts?

He's probably right. Replacing the fuel-pump's check valve on our '91 
200q (with only 62K) solved exactly the problem you've described. The 
valve is very inexpensive ($10?)--and it's a fairly quick 
job--definitely the place to try a "fix" before pulling, testing, 
replacing injectors. BTW, our "bad" valve was soooo bad that it was 
easy to blow air through it in either direction. Of course if your 
car already has had its oem fuel pump replaced with one of the new 
style "slim" pumps, there'll be no external check valve to replace, 
so either the problem is elsewhere (or the replacement pump is 
defective). You'll know which pump is in there as soon as you remove 
the bayoneting cover-plate--the old-style (original) pumps have that 
mushroom-shaped noise damper on top (and the check valve is just 
below that).



Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net

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