High idle, keeps going up!
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Joined: Dec 2010
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High idle, keeps going up!
I have a 89' f-250 with a 5-speed. it always seemed to idle around 850 rpm, the other night i ran though a fast food drive through, shut the truck off and ordered, started the truck back up and i noticed it sounded higher, looked down and seen it at 1000.
I now realize it was high to begin with, so i thought i would give it a try and adjusted the idle screw. I got the rpm down to 700 this morning that way, now by the end of the evening it is back up to 1000. any ideas?
Seen some people talk about the high idle solenoid, but the idle never changes on the truck, dont know if the solenoid just dont work or if the truck dont get warm enough. It usually never reaches the N in the Normal part of the gauge.
I dont know, Im stumped.
I now realize it was high to begin with, so i thought i would give it a try and adjusted the idle screw. I got the rpm down to 700 this morning that way, now by the end of the evening it is back up to 1000. any ideas?
Seen some people talk about the high idle solenoid, but the idle never changes on the truck, dont know if the solenoid just dont work or if the truck dont get warm enough. It usually never reaches the N in the Normal part of the gauge.
I dont know, Im stumped.
Posting Guru
Joined: Jul 2004
Posts: 1,627
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From: West Valley Utah
The throttle cable might be sticking a little. Lube the throttle shaft on the injection pump. Don't use a lot of lube, just enough to make things slide better.
Use something like WD40, NAPA silicon spray lube ect.
Use something like WD40, NAPA silicon spray lube ect.
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
I'm not trying to be the bearer of bad news, but if you don't find something sticking or hanging up, get a new IP and keep it handy.
The last time I had to replace mine, that was the first symptom. The idle wouldn't stay put, and "wandered" - no matter where I set it.
Good luck.
The last time I had to replace mine, that was the first symptom. The idle wouldn't stay put, and "wandered" - no matter where I set it.
Good luck.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
My first actions would be examine the throttle cable looking for frayed wires that are causing it to bind.
My next step, drain the fuel filter, refill with Diesel Kleen, start the engine for 20 seconds and turn it off.
That would get a strong dose of cleaner and lubrication in the IP.
Let it set for a while, then when you do start it, drive it a little hard.
Could be you have some crud in the govenor linkage holding the throttle open.
I always try the inexpensive fixes first.
My next step, drain the fuel filter, refill with Diesel Kleen, start the engine for 20 seconds and turn it off.
That would get a strong dose of cleaner and lubrication in the IP.
Let it set for a while, then when you do start it, drive it a little hard.
Could be you have some crud in the govenor linkage holding the throttle open.
I always try the inexpensive fixes first.
Postmaster
Joined: Jan 2010
Posts: 4,319
Likes: 4
From: Elk City, OK
normally 400 or so, but heres a deal while it lasts. PUMP,DIESEL INJECTION,REBUILT - eBay (item 200425807183 end time Feb-01-11 13:04:37 PST)
PUMP,DIESEL INJECTION,REBUILT - eBay (item 160393038320 end time Feb-01-11 12:56:18 PST)
you may wanna clean the cdr as well. could be letting excess oil in. oil burns hotter then diesel, also its adding more fuel to your system then just the fuel so that could cause the idle to get higher.
PUMP,DIESEL INJECTION,REBUILT - eBay (item 160393038320 end time Feb-01-11 12:56:18 PST)
you may wanna clean the cdr as well. could be letting excess oil in. oil burns hotter then diesel, also its adding more fuel to your system then just the fuel so that could cause the idle to get higher.
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Joined: Dec 2010
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well, I think I may have lucked out. when i adjusted the idle i noticed the idle screw a little loose. so in theory, when I am cruising down the highway it is standing vertically and can sit and vibrate its way down, so i pulled it out, added a lock nut, lathered her in lock tight and reinstalled it.
So far so good. but I guess only time will tell. cross my fingers! Thanks for all the help guys!
So far so good. but I guess only time will tell. cross my fingers! Thanks for all the help guys!
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