I have a 92 buick regal with the 3800 engine, the engine doesnt miss but its got a roughness/shake to it, it burning grayish out the exhaust *fuel* and smells extremely rich, while checking it over today we decided to unplug the vacuum line to the fuel pressure regulator. When we did there was no difference at all except for the engine revving up from the vac leak, when the vac leak was plugged with your finger the engine went back to running like it was with the regulator plugged in. I dont have a pressure tester nor do I have the extra $$$ to buy one unfortunetly and the car isnt road legal so it cant go to a garage to be tested. My question is.. with the fact there is no difference when the regulator is plugged or unplugged, does this sound like the regulator is bad?
Thanks for any advice
2007-09-22 13:10:44 · 2 answers · asked by CitationOne 3 in Cars & Transportation ➔ Maintenance & Repairs
head gaskets are fine, no water in oil or vice versa and compression checks out fine.. but even if it was a head gasket would that have anything to do with the fact my fuel pressure regulator makes no difference when its unplugged?
2007-09-22 13:37:32 · update #1
Yes I know that, but my main concern and question is.. Is it ok for the engine to run EXACTLY the same whether or not the FPR is plugged in? It should make some difference or it wouldnt have one to begin with correct?
2007-09-22 14:44:20 · update #2
The thing that goes bad in vacuum powered fuel pressure regulators is the vacuum diagram. If it's bad you'll likely have gas in the vacuum line. The vacuum line sucking a ton of gas into the manifold is what makes the engine run rich, not bad fuel pressure.
2007-09-22 14:42:24 · answer #1 · answered by Nomadd 7 · 0⤊ 0⤋
Not necessarily. The grayish smoke sounds like water problems. Maybe a head gasket.
2007-09-22 20:16:43 · answer #2 · answered by Ron F 3 · 0⤊ 0⤋