High idle
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Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
High idle
Hey guys,
Having a slight idling issue. My truck will idle around 1500 rpm and not come down. I just installed a FMS MAF conversion kit and have not yet changed the firing order on the injectors. It runs fine, just not SEFI. When I did the swap, it was running fine and the idle was ok. That was about 2 weeks ago maybe. My spider/side gears went out and the truck spent about a week and 1/2..maybe 2 weeks sitting in the driveway until I could repair it. Got everything going and last night I test drove it. Now my idle is pegged on 1500 and won't go down on its own. Now I do throw a check engine light, but it's been doing that since I put the MAF kit in because of the injector order. So basically, everything was working ok after the MAF swap, but now its been sitting for a week or two and the idle is screwy. Any ideas?
Having a slight idling issue. My truck will idle around 1500 rpm and not come down. I just installed a FMS MAF conversion kit and have not yet changed the firing order on the injectors. It runs fine, just not SEFI. When I did the swap, it was running fine and the idle was ok. That was about 2 weeks ago maybe. My spider/side gears went out and the truck spent about a week and 1/2..maybe 2 weeks sitting in the driveway until I could repair it. Got everything going and last night I test drove it. Now my idle is pegged on 1500 and won't go down on its own. Now I do throw a check engine light, but it's been doing that since I put the MAF kit in because of the injector order. So basically, everything was working ok after the MAF swap, but now its been sitting for a week or two and the idle is screwy. Any ideas?
Elder User
Joined: Mar 2004
Posts: 537
Likes: 2
From: Alabama
High Idle
Don't know how your engine is set up, but I have had (2) different occurrences of high idle caused by (2) different things. My '90 302 has all the emmissions control stuff on it. TAD, TAB, EGR EVR solenoids, smog pump and the whole nine yards. First high idle was the vacuum line coming off the bottom of the air bypass valve down by the smog pump. Second high idle was an Upper Intake Manifold gasket leak. First time idled at about 1100 and would not come down. Second time idled at about 2200 and would come down. First fix was easy, just put the line back on. Second one, had to install new gasket. The link below was posted on the 5 th, called High Idle Possible TPS? and I think it turned out to be intake gasket too.
Let us know,
guzzler96
https://www.ford-trucks.com/forums/s...d.php?t=225645 on manifold.
Let us know,
guzzler96
https://www.ford-trucks.com/forums/s...d.php?t=225645 on manifold.
Thread Starter
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Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Originally Posted by EPNCSU2006
I see the problem was resolved, but what code is it throwing with the MAF computer?
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Freshman User
Joined: Jul 2003
Posts: 35
Likes: 1
From: Peabody, USA
I've had a high idle problem for a while. I checked for a vaccum leak and didn't find anything. I was looking it over today and found out that the "coffee can" loacted on the pass side fender under the hood, had a small rust out hole on the bottom. There is 2 vaccum lines going into it. I pulled one vaccum line and I had vaccum going into the "coffee can" but nothing going out. Then I found the hole in the under side of the "coffee can". Now the truck runs fine.
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Looking for air tubes to throttle body
This is for mustanggt221, i was looking at the pics of your spark plug wires and noticed your air tubes going to the throttle body...where did you get these? i want a set of smooth ones so i can wrap thermal barrier tape around them and the airbox, but the set of tubes i have now are the stock ribbed ones...
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
Originally Posted by MustangGT221
They came in my MAF kit, but they are similar to the ones off an 87-91 or so truck.
Jason
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