vg66baller

If anyone could help it would be greatly appreciated... first of all I have a 1988 jeep cherokee 4x4 automatic with an inline 6.... this baby only runs when she wants to...sometimes will fire up..than sometimes it wont start for months....recently it has been starting up witho a problem..than I was gonna take her out fir a spin (she's not my daily driver) seems like she knows...she wont start.....I know when it will st because I will hear the ignition or fuel pump engage for a couple seconds. If I don't hear tha know it wont start....when I hear it engage she works like a charm...when it doesn't. I don't hav spark or fuel....????? I've changed the cps on th bell housing tried to bypass the fuel pump but still nothing .......any suggestions??? Oh btw do this year jeep come with an alarm....I've noticed clifford alarm almosts looks like a kill switch underneath the dash...do you think it might be related to this issue???... any answers would be greatly appreciated...Thx

jronald

An engine needs 3 things to run (back to the basics)
Fuel
Air
Spark
Your job is to figure out which of the 3 it is not getting.

Dont worry about the air, there is a 100% chance, its getting air.
Pull a plug wire and stick a screw driver in the end of it. Hold it close to metal, is there a spark?
That leaves fuel.

Ron

vg66baller

Thx ron....but that's what I think is weird..cause one minute everything runs great..the next I have no fuel or spark????

Metmknice

Sounds most like a failing CKP (Crank Pos. Sensor), try disconnecting it, and reconnecting it and see if it starts. IF it does, then that is at least one of your problems. A mech. fuel gauge on the fuel rail will tell you if you are getting good pressure as well.

vg66baller

Woo hoo....I just took out the clifford alarm system and she fired right up.....let's see if its consistant.....fingers crossed

freegdr

also needs injector pulse you can have all the fuel pressure in the world with out pulse you aint gonna go nowhere

vg66baller

Thx...she's still firing up like a charm...

jronald

I headed for the basics.

Air and Spark ok? Check for fuel pressure. Got fuel pressure I would have headed for the injector pulse. Elimination..............

Bottom line is the engine takes 3 things Air, Spark, Fuel. If you have all 3, its running.

Ron