IMCGM Posted February 10, 2004 Report Share Posted February 10, 2004 I have a 95 DeVille 4.9 with about 160,000 mi. on it. Yesterday for no apparent reason after driving it all day I went out to leave again and it started but barely and sputtered and died. When giving it gas it died right away, when feathering the pedal it would stay running barely and sputtered and back fired till I stoped feather the pedal then it died right away. I had new plugs wires filters etc. done less then 10,000 mi ago and self diognostic when you turn the key on say "system ok"...Just lookin for ideas and imput....PLEASE! Link to comment Share on other sites More sharing options...
KHE Posted February 10, 2004 Report Share Posted February 10, 2004 You need to hook up a fuel pressure gage to the fuel rail and monitor the fuel pressure when the symptoms occur. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Bob D Posted February 10, 2004 Report Share Posted February 10, 2004 Follow Kevins advice. Offhand, it sounds like your fuel pressure regulator (FPR) is going, which can give you those difficult hot start symptoms you described. It's a normal wear and tear item, (especially with higher mileage) not too difficult, or expensive to replace. One easy way to check this is remove the vacuum line going into the FPR 'can'. If there is fuel present, that's a sure sign it needs to be replaced, and would cuase the symptoms you are having. '93 STS.. opened, dropped, wide...fast. Link to comment Share on other sites More sharing options...
rjhat Posted February 10, 2004 Report Share Posted February 10, 2004 The last two posts are probably correct. If it is not the fpr, it would likely be a fuel pump. I think you would much rather replace the fpr. Link to comment Share on other sites More sharing options...
IMCGM Posted February 10, 2004 Author Report Share Posted February 10, 2004 if that is the case how do I determine which is the problem... Link to comment Share on other sites More sharing options...
rjhat Posted February 10, 2004 Report Share Posted February 10, 2004 I would do what bob D said first. Pull the vacuum hose off and check for gas leakage. If that doesn't pan out, try to rent a fuel pressure guage from an auto parts store and connect to the fuel rail. I know that my car usually runs between 45-55 lbs of pressure. Also check your codes for an answer. Link to comment Share on other sites More sharing options...
loucar1 Posted February 11, 2004 Report Share Posted February 11, 2004 I would check for trouble code as a first step. Then the FPR, but you may need that guage Have you replaced the fuel filter? Lou 94 Seville STS Link to comment Share on other sites More sharing options...
IMCGM Posted February 11, 2004 Author Report Share Posted February 11, 2004 I hooked a fuel pressure gauge up and got a reading of 0. With the fule door open we could hear the pump turn on, so doeg that leave me with the FPR and could someone give me an idea what it looks like... Link to comment Share on other sites More sharing options...
KHE Posted February 11, 2004 Report Share Posted February 11, 2004 Block off the return fuel line and monitor the fuel pressure. If the pressure builds up, then it is definitely the fuel pressure regulator. If the pressure does not build up, then I'd suspect the fuel pump. The fuel pressure regulator is on the fuel rail and has a vacuum line attached to it. There is also a smaller fuel line (that's the return line.) Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
IMCGM Posted February 11, 2004 Author Report Share Posted February 11, 2004 Is there any chance it could just be a clogged fuel filter? Link to comment Share on other sites More sharing options...
KHE Posted February 11, 2004 Report Share Posted February 11, 2004 I doubt it but anything is possible... I have never had one of the large diameter filters plug up enough to cause zero fuel pressure. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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