5.0 low idle when cold sometimes
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Senior User
Joined: Oct 2002
Posts: 379
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From: Shawnee , KS
5.0 low idle when cold sometimes
I've been searching through these forums for answers and my situation is slightly different. The truck is a '96 5.0 M5OD. When it is cold sometimes the truck will not idle first thing in the morning. I will crank it on and it will maybe idle at like 300-400 RPMS... enough to cause the oil pressure gauge to move low and the lights to dim in the cab etc.
There are two situations after this:
1.) Sometimes it will finally begin to idle. I will hear something become unstuck and the truck will begin to idle at its normal 1200 RPMS or whatever it is when it's cold. I can then begin my trip like normal.
2.) Sometimes it doesn't fix itself. The truck will idle very low my whole commute and will nearly die when I push the clutch in. When shifting gears the revs drop like a rock, rather than slowly fall like it normally does. I really have to speed shift or blip the throttle to even come close to rev matching gears (yes even going from 2nd into 3rd etc..).
I tried pulling codes 2 minutes ago and everything came back clear. The truck is getting around 15 MPG and has pretty normal power. Last year I replaced the gasket for the idle control valve.
Is there anything that I should look at specifically? It's too bad this is intermittent because I can't always repeat the problem to troubleshoot.
There are two situations after this:
1.) Sometimes it will finally begin to idle. I will hear something become unstuck and the truck will begin to idle at its normal 1200 RPMS or whatever it is when it's cold. I can then begin my trip like normal.
2.) Sometimes it doesn't fix itself. The truck will idle very low my whole commute and will nearly die when I push the clutch in. When shifting gears the revs drop like a rock, rather than slowly fall like it normally does. I really have to speed shift or blip the throttle to even come close to rev matching gears (yes even going from 2nd into 3rd etc..).
I tried pulling codes 2 minutes ago and everything came back clear. The truck is getting around 15 MPG and has pretty normal power. Last year I replaced the gasket for the idle control valve.
Is there anything that I should look at specifically? It's too bad this is intermittent because I can't always repeat the problem to troubleshoot.
Senior User
Joined: Feb 2010
Posts: 443
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From: Bear, DE
Mine is KINDA the same way. It only does it on the VERY first cold (sub 40 deg's) start. I have to hold the gas down a tiny bit for a split second while the engine cranks, then I can let go and it'll idle normally.
I've pulled codes too. Only one I got was a ECT sensor out of range (I did the test with a cold engine, gonna repeat with a warm to see if it goes away).
I've pulled codes too. Only one I got was a ECT sensor out of range (I did the test with a cold engine, gonna repeat with a warm to see if it goes away).
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FlyCool5.0
1987 - 1996 F150 & Larger F-Series Trucks
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Feb 8, 2015 01:40 PM
