Question about Jeep Grand Cherokee
No fuel peressure
Which engine, no engine stated means answers will be wrong.
that above is a statement so will run with that.
so what makes you think there is no fuel pressure??
1: the pressure gage is way low? how low , that you connected.
2: the pump seems silent. (near useless test)
3: pump never gets 12vdc cranking, you must crank.
4: the dribble test fails. (wasted time) (rail drips)
5: the injectors seem all dry, (spark plug tips are all dry)
now EFI 101 (crash course)
THE EFI system will be dead if fuse are blown.
and the ECU never injects with spark errors.
or CKP errors
or CMP errors
or IMMO is active. immobilizer is unhappy see lamp, look at it.
if all that works good, the ASD closes
the injectors fire
and the car starts if the ECU/PCM sees any errors stated above
it drops out in 2seconds <KILLING all injections,.
this is the PCM logic hard coded for fire prevention. all cars have it
does that help.
key factorys, ASD closes, for 2 seconds.
crank with no errors (scan tool shows errors after 5 seconds cranking)
if that works the engine does start.
ask for more tests, i have 3 more that find any bad start.
Posted on Feb 17, 2014
Testimonial: "Tnx,all OK,immo not work!"
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Posted on Jan 02, 2017
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