Guest TurboSedan Posted August 17, 2004 Report Share Posted August 17, 2004 today my engine was stumbling rather bad on acceleration, so i checked my fuel pressure today to see if it's 'normal' first i bled the fuel pressure down and removed the schrader valve from the fuel rail. i then screwed on a fuel pressure gauge that my brother and i pieced together at NAPA (we should have gotten a liquid filled gauge...the needle on this one vibrates too much). but anyways... first i checked fuel pressure with the key on and engine off. i could hear the fuel pump prime. the guage held a steady 45psi. next i started the engine up. at idle it read about 39psi. finally i checked the fuel pressure with the engine running but this time i disconnected the vacuum line that goes into the TB from the FPR. i held my finger over the hole in the rubber TB fitting so the engine wouldn't die while i did this. fuel pressure was about 49psi. i also noticed that the fuel pressure would rise as RPM increase (as expected). does this sound normal? my car is still having a stumbling issue - i replaced the plugs yesterday and it ran fine afterwards, but it was stumbling this morning. right now i'm suspecting the spark plug wires...i think i fucked one up yesterday when i pulled a boot off one of the old plugs. oh yeah, my fuel pump is a Masters brand fuel pump that i bought for a TGP application from Checker about a year and a half ago or so. the filter is fairly new also. the sock filter in the tank is probably only 2 months old. Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted August 18, 2004 Report Share Posted August 18, 2004 anyone know if the fuel pressure sounds normal? Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted August 19, 2004 Report Share Posted August 19, 2004 Fuel pressure is good Joshua, start looking for other problems EDIT: where exactly does the "stumbling" occur? any particular time?(off-idle, on the highway,etc?) Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted August 19, 2004 Report Share Posted August 19, 2004 the stumbling was during acceleration, and it idled rough also. i fixed the problem today. i found some extra spark plug wires leftover from my old 3.1 in my garage. i found that plug wire #1 had seperated from the end of the wire inside the boot. i replaced the wire and the engine runs great now, idles nice and smooth too thanks! Quote Link to comment Share on other sites More sharing options...
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