ericfx1984

Was driving my 96 4.0 Cherokee down the highway today and the XJ just lost power, I got to the side and it was just barely running, really low idle almost, kicking and just running REALLY rough... a few seconds later it died


I tried to start it, it would turn over but when you started trying to start it, the engine would buck and kick a little

I think I could smell fuel...

the shrader just only sprayed a little bit

I pulled the fuel line and I could hold back the fuel pressure with my pointer finger

someone suggested that my crank/flywheel sensor might be bad... any thoughts on this?

Turbo X_J

Check fuel pressure with a gauge, the pump is probably

ericfx1984

can I have some jam please ??

ericfx1984

funny thing is I purchased the pump 05/05/2011

I have been reading that Airtex pumps are pretty bad

tjwalker

What you have read is correct. I have about zero confidence in that brand. I can't tell you the amount of people that have had issues (including myself).

As mentioned, ALWAYS verify with a fuel pressure gauge. For a 96, you must have 49 psi for the engine to run correctly. From what you described, I don't think you have that 49.

Gee oh Dee

x2 on fuel pump being the cause.

Sucks that its so fresh. But at least you know you'll be really good at doing them now.

Magiksreal

X 3 to use a fuel pres. test gauge.

Sounds like a pump to me, but for sts and gns, also change the fuel filter.

I've had one fail before and cause a block like you're explaining. Dunno how or why it happened, only that the fuel filter fixed it...

If you can't be good, be good at it!

ericfx1984

yeah I hear ya Makic... bu I tested with out the fuel filter... and I can blow thru the filter like it's nothing

ericfx1984

OK... I have spark... I have fuel... but it will not start... it tries... a little sputter here and there... but it is not starting

keep in mind it is a 1996, first year for OBD2 but only has 1 O2 sensor

there are NO codes and NO check engine lights

94JeepCherokeeMan

Coil?

ericfx1984

it is possible... tested for spark using a spark plug hooked up to one of the plug wires... it was blue in color, but not super big...

ericfx1984

followed this test...


http://www.jeepforum.com/forum/f9/4-...6/#post7019813

everything on the CPS seems to be within spec :eyes:

so that is not the problem



THE GOOD NEWS is Advanced auto parts not only gave me a new pump, BUT they insisted on giving me my money back... so it worked out ok... would have been better had it just have been a pump...

Turbo X_J

Pop off the oil fill cap and see if the rocker arms move when the engine is cranked over.

ericfx1984

they do

Turbo X_J

Are the spark plugs soaked with fuel?