THIS MISFIRES ON DECEL ONLY.

2003 Jeep Liberty

Tiny

morris972

May, 21, 2012 AT 10:52 PM

This Jeep has had new heads installed recently. Runs great. Check engine light comes on when decelerating. Can watch the misfires on the scan tool. Shows misfires on all cyl's, but cyl 1, 3, &5 seems to set at about a 2 to 1 rate over cyl's 2, 4, & 6. Have already changed plugs. Disconnected each injector while idling & found nothing wrong. Smoked sys for vacuum leak. Found small leak at throttle body shaft. Don't know if this is enough to cause a problem. Usually sets a p0300, but once set 300, 303, 304, 305. Has not done that again. This crazy thing is a 3.7. Surprise!
Any suggestions?

FOUND 1062 RELATED QUESTIONS

1 Answer

Tiny

mhpautos

May, 22, 2012 AT 9:22 AM

Normally associated with lean mixture and sometimes an exhaust leak at the manifold, also faulty leads can cross fire if they are bundled together, try these.

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