jeep4lf

Was driving everywhere last night no problems then this morning get going and she just stops at the first light I hit the breaks and she turned off now it'll turn over but seems like no spark or anything any suggestions

jeep4lf

I think it's the fuel pump but not sure

jvanhare

Spray some starting fluid into it and see if it fires and dies or doesn't fire at all.

XJUSMC

I would also look into the tps. Mine was doing the same thing and was not shifting into OD. It would turn off three times after a cold start.

jeep4lf

Well it's not the pump that's working fine ...

F1Addict

Crank position sensor?

jeep4lf

How do you check that

F1Addict

Unplug it from the harness and probe A and B (on the CPS side, not the harness side) with a multimeter set to AC volts (yes, AC). With the engine cranking (it won't start) you should read 0.5v AC. Anything under ~4.5 and your CPS is suspect.

Also, just unplugging and replugging sometimes clears the issue.

F1Addict

You could just check for spark as well, whatever technique you prefer as there are many. Starting fluid in the throttle body, tongue on spark plug wire (<<<that's a joke, don't do that), pull a plug and ground it while cranking, probe the coil... like I said, lots of ways.

revolver

ignition coil, same thing happened to me a while ago, also a 97.

cruiser54

Good idea.

tjwalker

I approach every no-start in the same way.

First, check for spark.

Pull a spark plug. Keep it attached to the plug wire. Place the plug electrode near a good engine ground. Have a buddy crank the engine while you watch. You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark, which may not be strong enough to start the engine.

If spark checks out (and only IF), try a small splash of gas into the intake or a small shot of starting fluid. If the engine starts and runs for a little bit using this technique, you have identified a FUEL DELIVERY problem.

The above two tests are quick and dirty but are extremely valuable in isolating root cause here.

Do NOT throw parts at this on a hunch. You will likely be wrong and your pocketbook will suffer for the guesswork. Test your way to a solution here.

Good luck and keep us posted!

XJdryva

Same happened to one of my 88s. Someone had added a 2ft extension to the CPS for some reason and it was wrapped around the front driveshaft...

jeep4lf

Found out its the cps for sure got one with a lifetime warranty for 85 not bad will throw it in tomorrow and hopefully take her out as well

jvanhare

Awesome, I was hoping that first post wasn't broken down on the roadside!