My Jeep Cherokee with 4.0 will crank but not start. If I off key and restart it will start immeditately. Had fuel pump checked and all is good. What else could be causing the problem?
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Is it out of gas? Try spraying starting fluid into the throttle body and see if it starts then. If so, you have a fuel delivery problem. If not, you have an electrical problem (no spark).
does the motor crank. if it cranks the starter and altnator are good. now when you turn the key to the start position do you hear the fuel pump? do you know if you have spark at the spark plugs
Check your temp sensor. if it's out of range it could be sending incorrect readings to the computer. Also check the white ceramic block on the drivers side fender back near the brake cylinder. It is a resistor that affects pump pressure on start up.
this is a fuel problem, fuel pump is bad, or fuel filter is clogged up. check to see if fuel pump is working. check fuses and relays if it does not work. to rule out a bad fuse or relay.
you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs or if your missing crank sensors RPMs, it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.
check the fuel pump fuse/relay, could be just bad enough to cause an intermittent start/no start. and check fuel pressure,spark and the crank position sensor.
First install a fuel pressure tester on the fuel rail and check the
pressure during crank. It should be about 30 psi.If the pressure is not
good then it could be a bad fuel pump relay or fuel pump itself (in the
tank).
If the fuel pump pressure is good then you could have a bad crank sensor.
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