Engine Stalling
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Elder User
Joined: Feb 2005
Posts: 630
Likes: 1
From: Central PA
Engine Stalling
My 98 5.4 has been stalling out immediately after starting. It wont stay running unless I hit the gas pedal as I start it and keep my foot on the gas. It doesn't seem to want to idle. After a few tries or if I keep my foot on the gas for a few minutes the problem goes away. Its been doing this for 4 days now. When it first happened, I found the driver's side PCV valve hose disconnected. I reconnected it and it started fine and I thought I fixed the problem. But the next day and everyday since, Its been doing it. So far, its always the first start of the day when the problen occurs. Also, there is no "check engine" light. Could it be a vacuum leak? I don't hear anything taht would indicate that. Any suggestions would be appreciated. Thanks!!
Tuned
Joined: Dec 2006
Posts: 344
Likes: 0
From: huntsville, alabama
Icefan71,
Your Idle Air Control valve has stopped functioning properly. You can remove it and spray clean with a cleaner that leaves no residue (brake cleaner?) or replace it:
1. Disconnect negative terminal from battery(5/16"). Two reasons, safety, and the engine computer has to be provoked into calibrating the new IAC to work with your engine. Disconnecting/reconnecting the battery will accomplish this.
2. Unbolt the three bolts (10mm, I think) that secure the plastic "4.6" cover to the top of the engine.
3. Find the little SOB. It's on the driver's side, looks as described.
4. Unplug the two-wire harness from it.
5. Unbolt the old IAC (two bolts, 8mm) and remove the IAC and the old black mounting gasket.
6. Bolt the new IAC in its place. Don't forget the new gasket!
7. Plug the wiring harness you unplugged in step 4 onto the new IAC.
8. Put 4.6 cover back on.
9. Reconnect negative terminal to battery.
10. Start engine and let idle for fifteen minutes (Don't touch the accelerator!) to allow the engine management system to learn how much voltage the new IAC needs to perform it's job.
I borrowed this info from another post. I think it was on another forum too.
Your Idle Air Control valve has stopped functioning properly. You can remove it and spray clean with a cleaner that leaves no residue (brake cleaner?) or replace it:
1. Disconnect negative terminal from battery(5/16"). Two reasons, safety, and the engine computer has to be provoked into calibrating the new IAC to work with your engine. Disconnecting/reconnecting the battery will accomplish this.
2. Unbolt the three bolts (10mm, I think) that secure the plastic "4.6" cover to the top of the engine.
3. Find the little SOB. It's on the driver's side, looks as described.
4. Unplug the two-wire harness from it.
5. Unbolt the old IAC (two bolts, 8mm) and remove the IAC and the old black mounting gasket.
6. Bolt the new IAC in its place. Don't forget the new gasket!
7. Plug the wiring harness you unplugged in step 4 onto the new IAC.
8. Put 4.6 cover back on.
9. Reconnect negative terminal to battery.
10. Start engine and let idle for fifteen minutes (Don't touch the accelerator!) to allow the engine management system to learn how much voltage the new IAC needs to perform it's job.
I borrowed this info from another post. I think it was on another forum too.
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