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1995 964 Runs rough 900

posted by  dnice on  Thu Apr 19 19:37 CST 2012
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last visit: Thu Jun 13 18:49 CST 2013
[RELATED]

Hi Guys,

Has been awhile since my last post. Hope you can guide me a bit.

This problem just started suddenly. Engine was running smooth before this problem.

Engine starts well when cold until air pump kicks in. Then it begins to run rough. Engine can be accelerated normally until engine warms up a bit. The warmer it gets the worse it runs at idle and feels like stumbling while accelerating. If accelerated slowing it'll build up RPM's, but if done quickly it stumbles badly. Eventually engine stalls and will restart but reluctantly.

I checked:
-Sprayed starter fluid around intake boots with no changes.
-Fuel pump relays by swapping them and didn't make any difference.
-Fuel pressure. KEY ON pressure was btwn 42-43psi
-Fuel pressure Engine Running at idle 38psi, accelerating 38-40psi
-Pulled vacuum hose off regulator and it jumped to 48psi
-Disconnected connector at air pump and oddly it sounded like it ran when started cold. Did I disconnect the wrong connector?? (PICS at link)

http://s244.photobucket.com/albums/gg26/photonut2008/Volvo%20FPR/

Was thinking possible fuel filter, fuel pump issue as pressure seems low while at idle or accelerating.

Any feedback appreciated.

Thanks.





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