Cranks with spark and fuel but won't start?
Asked by Dwinnings Dec 31, 2016 at 09:48 PM about the 1990 Jeep Wrangler STD
Question type: Maintenance & Repair
I gavec1990 jeep wrangler with 2.5 . While driving it
sputtered backfired and quit running. Have
checked for spark changed coul. Checked for fuel
getting fuel. Checked timing by aligning tdc and
looking at position of rotor under distributor.
Correct alignment according to Haynes manual.
Have not checked compression. Just will not start.
What else could be wron?
6 Answers
Ok you say you have fuel but what is the pressure at rails should be about 38 pounds, did you ohm out the injectors they should be anywhere from 14.2 to 14.4 ohms and when you crank her you should around 5 volts to each. Which jeeps with high miles the chain could stretch and jump a tooth. The compression should be about 130 to 145.
Sorry it's been a,while now since my first question. So it is a throttle body and you can see the fuel pulse when cranked. Still haven't checked compression. I thought about the timing jumping a cog. But no way to adjust time since it is computer controled. When it stop running it really spit and sputtered and backfired then nothing. I changed the coil because the spark I was getting g looked a little orange. New coIL better looking spark but still no run.
I have a 1994 Jeep Wrangler that gets spark one min and the next min it don't I had is start and try to drive it and it would shut off and not start up again
Did you figure it out?
Antonecappone76 answered 5 years ago
My yj was running fine then it shut off all pressures are normal bubit will have spark for a little while then it's gone again replaced the ignition coil 4times and still does the same thing ...my jeep is my baby please help me
Just fixed problem with 97 Wrangler 2.5 which would crank, but not fire easily. I found I could get it started by only cranking for a short burst and stopping if it didn't fire up. Turned the key on after that for ~2 sec and tried again. Usually it would fire up after 3-4 times as long as I didn't hit the gas. Fuel pump was recently replaced so OK. Once it started up it would run OK, but would hesitate every once in a while. Turns out it was the crank position sensor. Strange that it didn't show any codes for it in the diagnostics.
