Join Date: Nov 2001
Thanked 5 Times in 5 Posts
Re: HELP! Jeep still won\'t start
Thanks for the response, that's what I was looking for, somebody to just throw out ideas and maybe hit upon something I'm missing.
No to all of the comments though. It only has the one sensor for rotation, the distributor. I first thought that was the problem because forgot to disconnect it and I pulled the connector off the end of the cable. I soldered the connections back, removed the computer and rung out the wires all the way to the ends. Also checked for shorting between the wires. All that is good.
I actually had the plenum and tubes off, had it covered with a heavy plastic sheet like a tarp, used to be part of a waterbed mattress. Didn't stuff anything in the holes.
No neutral safety switch. Good power and ground to the computer. No faults. Got an Auto-Xray, shows proper readings for injector pulse width etc.
Even though it's port injected, it's not timed to the piston. It has four injectors on each side, each set on a separate fuse. It fires all four at a time.
There is no reason for me to be out of time, didn't have the cam or distributor out. Even if it were a timing issue, I'd think it would either run poorly or I'd hear a backfire through the intake or exhaust. Nothing, just a couple half-hearted coughs like it tries to start every so often. I've tried a timing light while cranking, I get flashes but not at high enough frequency to really provide enough light to see the mark. I'll try again when it's darker.
Good spark, I can consistently pull a 3/4" spark at a plug wire. Like I said with the high voltage coil wire to the distributor removed, it would build up enough charge to jump an inch and a half gap.
I've cranked the engine and placed my hand over the throttle body on the front of the plenum and also over both of the exhausts. It sucks in the plenum and blows out the exhaust.
Only thing I can think of now is the diaphragm got dry in the fuel pressure regulator and cracked. I'll pick up a fuel pressure gauge tomorrow and check for proper pressure. Fortunately, I have a spare regulator. Unfortunately, it's a PITA to change. I have to remove the plenum, a fuel rail and probably a runner for clearance.