Bad miss and won't idle
I have a 2005 jeep grand cherokee that has a 4.7l. It has a bad miss and don't want to
idle. I changed the spark plugs and coil packs but didnt help. The check engine light is on
but code reads oxygen sensor but I was told by a dealer that wouldn't cause it. Anyone
got a clue what it might be.
What is the code? O2 Codes don't always mean the sensors are bad, your dealer is right. Check for vacuum leaks too.
The Positive crankcase Ventilation (PCV) vacuum system is leaking. At the rear of each heads, hose enters and do split, that will give you a random misfire, in turn will cause O2 not to read accurate.
I just bought a 2006 Jeep Grand Cherokee Ltd. 4.7 V8 motor. Are there any problems with this engine? Is there anything I can do to help the gas mileage?
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