• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

High / Fast Idle


mnewman

Active Member
GMRS Radio License
Joined
Jan 16, 2020
Messages
141
Reaction score
50
Points
28
Location
Ohio
Vehicle Year
1986,1992,2003
Make / Model
BII, Rangers
Transmission
Manual
2WD / 4WD
4WD
I did a bit of searching and tried some stuff to no avail. I have an '88 2.9 w/auto. As of now it will not idle below 1600 RPMs. I drove it, ran fine, parked it and the next morning I have this problem. Vac lines aren't leaking. Swapped MAP sensor off a good running truck. Same result. Unplugged IAC and idle stayed high. Am I still looking a vacum leak? I sprayed brake cleaner at the base of the intake but didn't get any change in RPM. What else should I look at?
 


Dirtman

Former Middleweight Moss Fighting Champion
Joined
May 28, 2018
Messages
19,304
Reaction score
13,326
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.
Pull the IAC valve off and verify that it is actually closing. They can get gummed up and jam open. If thats not it then you almost certainly have a vacuum leak.
 

mnewman

Active Member
GMRS Radio License
Joined
Jan 16, 2020
Messages
141
Reaction score
50
Points
28
Location
Ohio
Vehicle Year
1986,1992,2003
Make / Model
BII, Rangers
Transmission
Manual
2WD / 4WD
4WD
Nailed it. I didn't know those went bad like that. Everyone I've had die always dropped the idle. Thanks!
 

Sponsored Ad


Sponsored Ad

Staff online

Today's birthdays

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top