5.8 rough idle?
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5.8 rough idle?
I have 96 f250 5.8 and lately its started to idle really rough. when i first start it in the morning its fine, then it starts to get rough. every now and then it will even out for a few seconds then get rough again. Also when i put it in drive it bogs way down and sounds like its going to die, then springs back and the truck tries to lurch forward. Any ideas? I'v done a basic tune-up (plugs,wires,coil,cap,rotor,fuel pressure regulator) Thanks
Laughing Gas
Joined: Jan 2008
Posts: 751
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From: NC
Sounds like you may have a vaccum leak. Is it throwing any codes?
Also as for the tune-up, don't forget the fuel filter and PCV valve, it also wouldnt hurt to clean out the throttle body. I am not sure if the F250/350's have MAF senors, but if they do, make sure the senor itself is clean too...
Also as for the tune-up, don't forget the fuel filter and PCV valve, it also wouldnt hurt to clean out the throttle body. I am not sure if the F250/350's have MAF senors, but if they do, make sure the senor itself is clean too...
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Sounds like a fuel pressure problem to me, put a gauge on it ans make sure it's making 40psi all the time.
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I had a gauge on it last weekend, if i remember right I had about 37 at an idle, 40 with the FPR (new) hose off. But the odd thing was when the truck was off and the pressure had relieved, if i cycled the key i only gain about 2 psi per cycle, but it started fine. I was checking it to see if I had a sticking injector, but im not sure how fast the pressure should bleed out. is this normal for the pressure? thanks
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From: Lebanon, OH
MAP sensor
I had a gauge on it last weekend, if i remember right I had about 37 at an idle, 40 with the FPR (new) hose off. But the odd thing was when the truck was off and the pressure had relieved, if i cycled the key i only gain about 2 psi per cycle, but it started fine. I was checking it to see if I had a sticking injector, but im not sure how fast the pressure should bleed out. is this normal for the pressure? thanks
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