Will be driving and motor will cut off. Try to crank but it just cranks no fire up until i used jumper cables. The lights will still be on but flicker a little. I fired it up unhooked the battery and it idle fine besides voltage gauge moved up and down some. This has happened several times finally replaced fuel pump relay and CSP sensor it ran fine for a day and did it again. Any suggestions ? and will the 743 code shut the motor off ? it says its a trans code . Thanks
One problem at a time please. Let's get the engine running All the time! First, it seems that the battery is weak, perhaps old and past its prime (thus the jumper cables worked). Or, maybe you just need to clean off the battery terminals on the battery and the connecting cables. When did you replace the plugs, wiring harness, distributor cap and rotor last? Perhaps just cleaning them up will do the trick. Also, check that the grounding cables all over the engine compartment are clean and tight.
I just got back getting a new battery and plugs. So you think I should change the cap also? I have only changed the plugs about 6 years ago and the battery was 6 years old also with some corrosion. I have never changed to cap or rotor is it hard to do ?Thanks
Not difficult, but necessary! You need to do regular maintenance on your vehicle. Six years is way too long...yearly is recommended...check the owner's manual.
2001 4.0l i know it has a coil pack but cant seem to find cap and rotor
think it has no cap coil pack sets directly on top of plugs
Individual high voltage coils on each spark plug..nice! Now back to business...have you tried to reseat EVERY fuse and relay in the fuse boxes? There are 2; one under the dash on the driver's side (I believe) and the big one under the hood.
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SOURCE: 90 jeep starting problem
Check the crank position sensor. I had the same problem in a 1989 cherokee 4.0, and the solution was simply to acomodate the sensor wiring. No replace was necesary
SOURCE: Car dies at random moments
I just had this problem and replaced the camshaft sensor, crankshaft sensor, and coolant temp sensor. i replaced these items because of high mileage. try these but first check your relays located under the hood on the passenger side. sometimes they get hot and fail.
SOURCE: 2007 Jeep Wrangler Unlimited Crank-No Start. Replaced FP.
Hey Tim take a look at this, will this help ?
SUBJECT:
No Engine Crank Or No Engine Start Due To Electronic Lockup Of The WCM / SKREEM
OVERVIEW:
This bulletin involves the replacement of the Wireless Control Module (WCM), and if
equipped, the replacement of the Electric Steering Column Lock (ELV). The WCM is also
referred to as the Sentry Key Remote Entry Module (SKREEM).
MODELS:
2007
SYMPTOM/CONDITION:
The customer will experience a no engine crank AND a no engine start condition. Also, the
remote keyless entry (RKE) system will not operate. This condition may be due to an
electrostatic discharge (ESD) from the ignition key into the Wireless Control Module
(WCM), causing the WCM to electronically lockup. This condition may occur more
frequently in dry and/or cold weather conditions where a sufficient electrostatic charge is
more easily produced. This condition is corrected by the replacement of the WCM
DIAGNOSIS:
1. With the condition present (i.e. the vehicle in the no crank / no start condition), connect
the StarSCAN® scan tool to the vehicle.
2. Turn the ignition switch to the “ON” position, and power up the StarSCAN®.
3. If the WCM is electronically locked up, the StarSCAN® will display the WCM as being
“off bus”.
4. If the no crank / no start condition is present, and the WCM is “off bus”, then reset the
WCM by temporarily removing the IOD fuse (with the key out of the ignition switch),
wait for 10 seconds and then reinstall the IOD fuse.
5. With the IOD fuse reset having been performed, verify that the vehicle will now crank,
start, and run.
6. If the condition is temporarily corrected by performing the above steps, and if the part
number of the WCM is earlier than the part number of the WCM listed in the part
reference table in the Service Bulletin Parts Required Section below, then perform the
Repair Procedure.
SOURCE: 1991 Jeep Fuel Control Issue
Hey Mudkicker,
Who ever thought of putting an electric fuel pump inside a tank of gas........
Check your other gauges for accuracy. They do that when a ground is loose.
Check the wiring from the fuel tank along the longitudinal frame for frays and shorts. Plugs are secured.
Under the hood, passenger side, check the fuel pump relay. Switch it with one of the others to test it.
Bring the vehicle to an auto parts store. Ask them to break out he code reader. Check for diag codes
Comment me back
Mike.
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