lnwilcoxson Posted November 3, 2007 Report Share Posted November 3, 2007 my 92 sedan deville just rolled over 180,000 miles. This morning out of the blue it started hesitating like crazy. the problem is generally less apparent at light throttle but as I apply more throttle engine begins to hesitate and backfire through the throttle body. I replaced the normal things (maintenance was almost due anyway). I replaced the plugs and wires and installed a new fuel filter. No change in the symptoms. My catalytic convertor is just a few months old so i ruled out a restriction. Has anybody else experienced anything like this? I run premium fuel and always buy my fuel from the same company. I am not getting a service engine light at all. My drive to work is 43 miles and problem seemed to come and go both going to work this morning 36 degrees and coming home tonight 60 degrees. I am suspecting fuel pump? Link to comment Share on other sites More sharing options...
Ranger Posted November 3, 2007 Report Share Posted November 3, 2007 Before replacing the pump, replace the cap & rotor. Cap contacts will erode overtime from the spark. The gap widens and you get the symptoms you describe. Link to comment Share on other sites More sharing options...
lnwilcoxson Posted November 3, 2007 Author Report Share Posted November 3, 2007 Before replacing the pump, replace the cap & rotor. Cap contacts will erode overtime from the spark. The gap widens and you get the symptoms you describe. Thank You! I iwll give that a shot tomorrow. I wish this was a shovelhead or and evo engine , but, with injected car engines I am lost. Link to comment Share on other sites More sharing options...
PAUL T Posted November 3, 2007 Report Share Posted November 3, 2007 Check the fuel pressure regulator. It is probably leaking fuel and flooding the throttle body with gas. Look under the air cleaner for a small cylinder with a fuel line coming in on one end and a rubber hose on the other end. Pull the rubber hose with the fuel system pressurized (key on or running) and see if gas is coming out. If it is, replace it. It can be a bear to replace due to a screw that has to be loosened from the underside. Link to comment Share on other sites More sharing options...
lnwilcoxson Posted November 3, 2007 Author Report Share Posted November 3, 2007 Check the fuel pressure regulator. It is probably leaking fuel and flooding the throttle body with gas. Look under the air cleaner for a small cylinder with a fuel line coming in on one end and a rubber hose on the other end. Pull the rubber hose with the fuel system pressurized (key on or running) and see if gas is coming out. If it is, replace it. It can be a bear to replace due to a screw that has to be loosened from the underside. Thank You ,I will check it in the morning. Link to comment Share on other sites More sharing options...
wiz6728 Posted November 3, 2007 Report Share Posted November 3, 2007 if u try all of that i would do a fuel pressure test. if thats ok i would check the injectors next hope this helps Wiz DRIVE IT LIKE YOU own it!!!!!! 1967 chevy II ( FOR SALE!!!!) 1995 Lexus Es 300 1998 SLS Link to comment Share on other sites More sharing options...
beetlejuice Posted November 4, 2007 Report Share Posted November 4, 2007 My 92 Deville did what yours is doing. I fineally made a hose long enough to get my fuel pressure gauge up to the windshield and tape it where I could read it. When the car started sputtering the pressure gauge would drop and flucuate. Also with less that 8 gallons in the tank when I would stop the engine would die. I replaced the tank and fuel pump and have had no peoblems since. (YET!!!) It was about a 4 hour job for me including getting the fuel out of the tank. Now if I can Figure out how to get this to post. Link to comment Share on other sites More sharing options...
lnwilcoxson Posted November 7, 2007 Author Report Share Posted November 7, 2007 if u try all of that i would do a fuel pressure test. if thats ok i would check the injectors next hope this helps THANK YOU Link to comment Share on other sites More sharing options...
lnwilcoxson Posted November 7, 2007 Author Report Share Posted November 7, 2007 My 92 Deville did what yours is doing. I fineally made a hose long enough to get my fuel pressure gauge up to the windshield and tape it where I could read it. When the car started sputtering the pressure gauge would drop and flucuate. Also with less that 8 gallons in the tank when I would stop the engine would die. I replaced the tank and fuel pump and have had no peoblems since. (YET!!!) It was about a 4 hour job for me including getting the fuel out of the tank. Now if I can Figure out how to get this to post. Thank You, i noticed a while back that under 5 gallons I sould get a sputter Link to comment Share on other sites More sharing options...
Ranger Posted November 7, 2007 Report Share Posted November 7, 2007 Early '90's are known for tank baffles going bad. In low fuel situations (under 5 gal.) fuel will slosh away from the pump pick up, thus causing fuel starvation. Link to comment Share on other sites More sharing options...
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