My 98 Cherokee Cranks but won't start..
05-20-2011, 06:13 PM
#1
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Model: Cherokee
My 98 Cherokee Cranks but won't start..
I Have a 98 Jeep Cherokee 4.0 with 131,000 miles on it. When I Try to start my Jeep for the first time The jeep will just crank 4 to 6 times before it starts and it will start perfect every time after that. If I Let it crank over 1 time turn the ignition off and try to start again it will start right up. I Have New plugs and wires in the jeep New Fuel pump new 02 censors new TPS and IAC. My Reverse lights work. any ideas on what this can be? Thanks...
05-20-2011, 08:26 PM
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Model: Cherokee
Two Thoughts....
I'm learning as I go also...
First thought is the Crank Position Sensor (caused a hard start...lots of cranking before it would start...if it did at all..on my '95).
However....almost sounds like you're losing fuel pressure while it is sitting.
Try:
When it's cold (i.e...when you normally have trouble starting it)
Turn the key to the on (not start) position. Listen for the fuel pump to run for a few seconds. Turn the key off, wait a few seconds then repeat.
Try this once or twice more...then try to start it.
If it starts fine, you may have something allowing the fuel to flow back into the tank (takes time to get to the engine), or something not keeping the fuel system pressurized.
Maybe an expert can take over from there..
AFARR
First thought is the Crank Position Sensor (caused a hard start...lots of cranking before it would start...if it did at all..on my '95).
However....almost sounds like you're losing fuel pressure while it is sitting.
Try:
When it's cold (i.e...when you normally have trouble starting it)
Turn the key to the on (not start) position. Listen for the fuel pump to run for a few seconds. Turn the key off, wait a few seconds then repeat.
Try this once or twice more...then try to start it.
If it starts fine, you may have something allowing the fuel to flow back into the tank (takes time to get to the engine), or something not keeping the fuel system pressurized.
Maybe an expert can take over from there..
AFARR
05-21-2011, 04:52 AM
#5
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Year: 1999
Model: Cherokee
Engine: 4.0
Did you install the entire fuel pump assembly, or just the fuel pump?
There is a check valve in the regulator and when that goes bad, you can have a bleed down of fuel pressure and the exact symptoms you are describing.
And if the engine stumbles and runs rough for a few seconds after it starts, you could have a leaky fuel injector. That leak bleeds down pressure and then it runs rough for a short time as the excess raw fuel is burned off.
Get a fuel pressure gauge and start testing your way to the root cause here.
There is a check valve in the regulator and when that goes bad, you can have a bleed down of fuel pressure and the exact symptoms you are describing.
And if the engine stumbles and runs rough for a few seconds after it starts, you could have a leaky fuel injector. That leak bleeds down pressure and then it runs rough for a short time as the excess raw fuel is burned off.
Get a fuel pressure gauge and start testing your way to the root cause here.
05-22-2011, 11:32 AM
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Did you install the entire fuel pump assembly, or just the fuel pump?
There is a check valve in the regulator and when that goes bad, you can have a bleed down of fuel pressure and the exact symptoms you are describing.
And if the engine stumbles and runs rough for a few seconds after it starts, you could have a leaky fuel injector. That leak bleeds down pressure and then it runs rough for a short time as the excess raw fuel is burned off.
Get a fuel pressure gauge and start testing your way to the root cause here.
There is a check valve in the regulator and when that goes bad, you can have a bleed down of fuel pressure and the exact symptoms you are describing.
And if the engine stumbles and runs rough for a few seconds after it starts, you could have a leaky fuel injector. That leak bleeds down pressure and then it runs rough for a short time as the excess raw fuel is burned off.
Get a fuel pressure gauge and start testing your way to the root cause here.
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