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Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Jeep
Satisfied Customers: 47686
Experience:  16 years of experience
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I have a 2002 jeep liberty 4wd 3.7l ....has 6 new

Customer Question

I have a 2002 jeep liberty 4wd 3.7l ....has 6 new injectors....it won't run without foot on pedal....and smokes ....within running 4 or 5 minutes both converters are red hot....but plenty of pressure from exhaust....no codes whatsoever.....no valve noise.....intake
suckin very hard.....and most like it's out of time somehow.....but it's getting way too much fuel...absolutely ....... any ideas?...did this before injector replacement as well.....customer just wanted them replaced. .... this went from normal to this condition
while driving....and parked at light. .....no codes then either...
Submitted: 1 year ago.
Category: Jeep
Customer: replied 1 year ago.
Now it has a p0500 code for speed sensor....still horrible smoke.....red converters. .....like its way out of time.....took off drivers side valve cover to check for rocker arms....all ok.....haven't done passengers side......I hear these are bad for crank key shaft shearing. ....all day dropping valve seats.......any suggestions ?
Expert:  Chris (aka-Moose) replied 1 year ago.

Have you done a compression test to check the timing?

Have you checked for vacuum leaks, wrong fuel pressure, incorrect reading MAF sensor?

Customer: replied 1 year ago.
Vacuum yes....fuel pressure not at rail.......and compression for timing no.....how will compression on each cylinder tell me if it's jumped time?
Expert:  Chris (aka-Moose) replied 1 year ago.

When doing a compression test. You want to see 160 plus psi but more important the highest and lowest reading within 10% If a reading is to low then this indicates there is a possible valve open on the compression stroke resulting in low compression indicating a possible timing jumped issue.

The converters a red hot from to much fuel getting into them. That happens from high fuel pressure, valves open when they should not be, injectors spraying to long, not enough air getting into the engine, MAF sensor reading wrong.

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Customer: replied 1 year ago.
Gotcha ....give me a few and I'll get the numbers....
Expert:  Chris (aka-Moose) replied 1 year ago.

Thanks

Customer: replied 1 year ago.
150 psi on 1..3...4...5...6...... (0) on #2....
50psi on fuel rail when key on then quickly to 0.....50 psi while keeping it running.....is valve seat dropped keeping valve open....?
Expert:  Chris (aka-Moose) replied 1 year ago.

Bring cylinder 2 up to TDC compression, then apply air to the cylinder while holding the crank and see where the air escapes, the intake or exhaust (valve issues) or the oil fill cap (rings)

Customer: replied 1 year ago.
2 Intake rocker laying In top of the head
Expert:  Chris (aka-Moose) replied 1 year ago.

Glad you found the issue.