Idles funny
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Joined: Jan 2012
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From: Southern West Virginia
Idles funny
'97 F250 PSD, after it's up to normal operating temp, and I stop and let it idle, it idles up and down just a little. It's fluctuating at about 1 to 2 sec. intervals. When it's up, it's smooth. When it drops down, the truck rocks. Just changed the CPS, but it was doing it before. Did injector o-rings a couple months ago. What would cause this? Would the HPX crossover help this, or is it an IPR or oil issue?
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Joined: Jan 2012
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From: Southern West Virginia
I just changed the fuel pump, hoses and put all new o-rings in the fuel bowl and FPR. Had the FPR apart and cleaned it. That was around the same time I did the injector o-rings.
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From: Livoina,La
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Yeah, I have two, a 94.5 and another '97. That's where I got the CPS! LOL! It's a grey parts store one though. I need to get off my butt and get one from Ford!
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When I changed my ICP it really improved my idle AND throttle response.... It was working and not leaking, but it looked original ( 400K) and I had an International one handy, that I paid 75 bucks for from a buddy who worked at the local dealer .......
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From: Southern West Virginia
I plugged it back up right after I unplugged it and the idle smoothed out. The up/down idle didn't come back and I didn't wiggle it or anything. I'll try it again tomorrow. I'll take the truck out and get it up to temp and see what it does.
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The up and down idle issue came back when I plugged the ICP back up. I had it unplugged for 30 sec. or so. While it was unplugged the idle smoothed out. When I plugged it back up, the idle issue came right back. I took the ICP from another truck and put it in mine, no change. That one may be bad too, or is it something else?
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From: Livoina,La
SURGE AT IDLE
1. ICP circuit problem, disconnect the ICP sensor, if the surge goes away then you possibly have a bad ICP sensor.
2. AA code injectors installed into a engine that require AB code injectors will cause a surge (California emissions in 96 and 97 require AB injectors)
3. 94-97; if you have any transmission range sensor codes repair these first. A bad transmission range sensor can back
See if it surges in neutral
1. ICP circuit problem, disconnect the ICP sensor, if the surge goes away then you possibly have a bad ICP sensor.
2. AA code injectors installed into a engine that require AB code injectors will cause a surge (California emissions in 96 and 97 require AB injectors)
3. 94-97; if you have any transmission range sensor codes repair these first. A bad transmission range sensor can back
See if it surges in neutral
Thread Starter
|
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
SURGE AT IDLE
1. ICP circuit problem, disconnect the ICP sensor, if the surge goes away then you possibly have a bad ICP sensor.
2. AA code injectors installed into a engine that require AB code injectors will cause a surge (California emissions in 96 and 97 require AB injectors)
3. 94-97; if you have any transmission range sensor codes repair these first. A bad transmission range sensor can back
See if it surges in neutral
1. ICP circuit problem, disconnect the ICP sensor, if the surge goes away then you possibly have a bad ICP sensor.
2. AA code injectors installed into a engine that require AB code injectors will cause a surge (California emissions in 96 and 97 require AB injectors)
3. 94-97; if you have any transmission range sensor codes repair these first. A bad transmission range sensor can back
See if it surges in neutral
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