Jeep Wrangler Forum banner
1 - 8 of 8 Posts

·
Registered
Joined
·
46 Posts
Discussion Starter · #1 ·
Engine turns over fine but won't start on it's own. Discovered today that if I give it a shot of starting fluid to get it started it runs fine. As long as I leave it running everything is normal.....no check engine light.....no codes.

I have switched out the horn relay(which works) with the ASD and the fuel pump relay...same prob.

Could it be the CPS? Can someone advise on a way to check it? Any help very much appreciated.
 

·
Registered
Joined
·
298 Posts
So you are saying it will crank and continue to run on it's own after spraying the starting fluid? Or are you having to continue giving it shots of fluid to keep it running once it's fired off? Makes a huge difference in diagnosis. Also if it is continueing to run on it's own with no spray after initial crank is it running well? Seem to rev normally? Drivability?
 

·
Registered
Joined
·
298 Posts
Yeah, I think Owen hit it there. If the IAC has failed in a position where it is just shy of allowing enough air through the shot of ether will be enough to kick it off, after that the engine will run ok depending on outside air temps and all being as the IAC is really nothing more than a choke and idle up circuit for when the AC compressor kicks in. Pull the IAC and give it a good cleaning. The pintle on the IAC should move in and out with a bit of force, basically just a spring loaded solenoid that the computer sends a pulse width modulated signal to that determines how far the air circuit is opened or closed at idle. There really isn't any direct feedback to the computer to set a code unless the winding in the coil on the IAC is open.
 

·
Registered
Joined
·
46 Posts
Discussion Starter · #8 ·
Finally got it back to normal...actually better than it was. Tried cleaning the TB by spraying cleaner in the IAC slot while still on the Jeep. It was better but still didn't want to start. Took the TB off and apart cleaned it thoroughly and now it runs better than ever. Thanx again for the advice.
 
1 - 8 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top