Will not start

Tiny
TBRINKMEYER
  • MEMBER
  • 1997 JEEP WRANGLER
  • 4.0L
  • 6 CYL
  • 4WD
  • MANUAL
  • 160,000 MILES
Hadn't had any problems up until a couple weeks ago my vehicle wouldn't start. The battery is strong, the starter turns over fine but won't fire. However, when the ignition is on the battery and fuel gauge don't respond. Based on this other troubleshooting suggest that it's likely the CPS but when disconnecting the CPS wire connection the gauges still don't respond. I also used an ohm meter to make sure the CPS was reading as it should and it checked out fine. I've checked all fuses and any same relays I've exchanged location with no success. I checked the ignition coil ohm reading and it's checked out fine. Spark plugs were changed out at around 150,000 miles and the fuel pump was changed out around 135,000 miles. When turning on the ignition listening for the fuel pump I can't hear it activate for a few seconds as I should. So I disconnected the fuel pump wiring are the rear of the vehicle and checked the meter readings and it doesn't seem to be getting power. I inspected the fuel pump wiring from the rear to the front and found no damage. I've tried using a diagnostic FIXD but it requires the vehicle to be running to get a read.

I don't know what else I can check other than I could spray starter fluid into the intake to get it to briefly start but I'm certain that would work. It seems that it's electrical but I've not found any culprits. Please let me know if there's anything else I can look into. Thanks.
Saturday, July 6th, 2019 AT 4:13 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

An ohmmeter is not a test for the signal from the crank sensor. What you need to do is to crank the engine and see if you get an RPM reading either on a scan tool or on the tachometer on the dash if you have one.

https://www.2carpros.com/articles/car-cranks-but-wont-start

The crank sensor is a very common failure for no start but has no effect on the dash cluster.

If you spray starter fluid into the intake and it starts and stall, that will tell you that you have spark and that you have a fuel delivery issue. Try this test.

I would also check the actual fuel pressure to be sure it is supplying the correct pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Thursday, September 24th, 2020 AT 6:19 PM

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