93 Exp XLT idles poor
Thread Starter
|
Freshman User
Joined: May 2006
Posts: 26
Likes: 0
93 Exp XLT idles poor
I have a 93 Exploader XLT with the 4.0.
When it is cold it does not want to stay running, it idles around 550RPM but abbruptly dies. When warm it idles around 600, but very rough. This started 2 weeks after a headgasket replacement. I'm thinking my EGR valve is bad, any ideas?
When it is cold it does not want to stay running, it idles around 550RPM but abbruptly dies. When warm it idles around 600, but very rough. This started 2 weeks after a headgasket replacement. I'm thinking my EGR valve is bad, any ideas?
Senior User
Joined: Jul 2005
Posts: 281
Likes: 0
low compression could cause bad idling. Run a compression test and make sure the cylinders are the same all the way around. EGR is a likely possibility, you could test that by disconnecting the egr vacuum line and plugging it. Did you check for vacuum leaks? Does it run fine except for when it idles?
Thread Starter
|
Freshman User
Joined: May 2006
Posts: 26
Likes: 0
runs great except at idle, vaccum connections check okay.
It idled fine before the gasket work, I developed a small leak in the lower intake gasket and decided to pull the heads while I was down there. Everything inspected ok.
Any tell tale signs of poor compression without bringing it into a shop?
It idled fine before the gasket work, I developed a small leak in the lower intake gasket and decided to pull the heads while I was down there. Everything inspected ok.
Any tell tale signs of poor compression without bringing it into a shop?
Post Fiend
Joined: Jul 2005
Posts: 8,462
Likes: 4
From: Durant, OK (SOSU)
IAC = Idle Air Control valve. Controls the idle speed by allowing air to bypass the throttle plate when it's closed.
It's a small metallic cylinder on the driver's side of the throttle body with a few wires coming out of it. At least it is on my '94 4.0L Ranger.
Remove and clean, it gets dirtied up over time. Usually cleaning it fixes it.
RP
Zach
It's a small metallic cylinder on the driver's side of the throttle body with a few wires coming out of it. At least it is on my '94 4.0L Ranger.
Remove and clean, it gets dirtied up over time. Usually cleaning it fixes it.
RP
Zach
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
Rangerpilot is probably correct,
if you disconnect the electrical contact from the IAC it should drop the idle to the 600+, if it does not change the idle the IAC is either bunged up with carbon or dead, a vacuum leak would give you a high idle so we may as well discount that...
if you disconnect the electrical contact from the IAC it should drop the idle to the 600+, if it does not change the idle the IAC is either bunged up with carbon or dead, a vacuum leak would give you a high idle so we may as well discount that...
Trending Topics
Posting Guru
Joined: May 2002
Posts: 2,450
Likes: 2
From: Baltimore
Here's the link to a great post about IACs. https://www.ford-trucks.com/forums/s...hreadid=166103
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Senior User
Joined: Nov 2003
Posts: 478
Likes: 0
From: ut
The IAC is likely the problem. But if cleaning doesn't help, check the codes. My 94 throttle position sensor (TPS) just went bad and the idle was erratic. (But driving was too). Running the diagnostic pinpointed the problem real fast. Check the posts at the top of this forum for help if you've never done it.