4.0

[rollbar]

What does it mean when U have or smell gas in the oil?

I need a clareification.

Thanks,
RollBar

[Goose]

Well If It's a pretty strong smell or the level of oil is rising.. Usually it means the carb is flooding (or a bad injector on a F/I engine) Possibly a fouled plug if the engine is missing.. at any rate it is fuel getting past the rings in sufficient quantity to be a concern..

[rollbar]

After further review & not listening to the DEALER>

O.k. here it goes.

Get your thinking cap on.

1. Compression test on all cylinders = 125lbs. Engine=170,000 miles. Has proper fuel pressure.

2. Engine runs fine w/a little hesitation then quits, let it sit for 10 min & it starts right up.

3. Replaced the throttle positioning sensor, cap, rotor, plugs (plugs were clean, NO oil), wires & the FUEL pressure regulator.

4. Took it to the dealer & he says it's between the computer & the coil, when it DIES it has no spark but let it sit & it fires up.

5. Dealer also said the plugs were oil fouled (NOT) & the distributor was bad (NOT, Dizzy is good).

6. NO codes from the computer so that's why the dealer can't tell me what it is.

7. Gas in the oil was due to cranking w/no spark.

8. Just changed the oil/filter tonight.

9. Full tank of premium gas ($$) w/sea foam cleaner in it.

HUmmmm, it's something very simple.

** I hope it ain't the computer going bad.

[pyagid]

know anyone else with the same vehicle? swap the computer out with them real quick see if it still does it. Otherwise it looks like you could get them for about $50 from the junkyards, but that would be a $50 test that may not work.


Computer
Jeep Grand Cherokee A 065372 $60 Eagle Auto Parts South, Inc. USA-MI(Three-Rivers) E-mail 1-800-900-8630

1997
Engine Computer
Jeep Grand Cherokee 4628 $55.01 Ryans Northend Auto Parts, Inc. USA-MI(Ferndale) E-mail 1-800-505-7600

1996
Engine Computer
Jeep Grand Cherokee TESTED OK 4.0 - GREAT LOW PRICE ! A 060312 $44.95 Marshalls Auto Parts, Inc. USA-OH(Circleville) Request_Quote 1-800-333-2104 Request_Insurance_Quote

1997
Engine Computer
Jeep Grand Cherokee 4.0 good A1009 $44 Carz R Us USA-IL(Armington) E-mail 1-309-392-2000

[Goose]

Ok here's what caused mine to do that.. the Hall effect sensor on the crank was getting flakey (crank timing sensor)..you could toodle around on a cool day for 15 minutes or 1 minute completely random..and very annoying, It wasnt that expensive either.. like 40 bucks.. but no codes no info just no spark.

[rollbar]

replaced the crank positioning sensor--no effect
Replaced the coil-had a crack- runs excellent.

I'm going back to get my $$ back from the dealer cause I was told I needed a rebuild & the plugs were oil fouled etc.

GAs in oil I think was the weak coil & lack of starting, it smoked after the change for a while but then it cleared up. I thnik the gas dried out the ring.

Thanks for all the help,
RollBar

[boman40]

change the coil, or it is the fuel pump, if it is the fuel pump pressure usaully
drops to around 40 psi, had the same problem with my grand cherokee at different times.

[runnamuck]

make sure you never lose the 5V ref signal. there are two. sounds like a sensor shorting to ground when hot, thus taking out the 5V ref signal. without the ref., all hell breaks lose. injectors go full stream among other things.