00 MULTIPLE/RANDOM MISFIRE AND STALLS

2000 Jeep Grand Cherokee

Tiny

danielwalker-peters

October, 9, 2012 AT 8:49 PM

Please help
Got an 00 jeep grand Cherokee 4.7 v8
It is throwing p1756 p0300 and at least 3 diffrent misfire codes for cylinders always different and every cylinder has been pulled
First I noticed really bad exhaust manifold leak causen the H02 sensors reading unmetered air. Extracted the broken bolts
Nothing still doing it
Did compression test getting. 90 - 100 all away around
replaced cam and crank sensors
Still nothing
Any ideas whay it might be

5 Answers

Tiny

ASEMaster6371

October, 9, 2012 AT 8:55 PM

What about the basics, like plugs and coil?

90-100 is low for that motor.

Vacuum leaks? Injectors? Wiring to injectors?

Roy

Tiny

danielwalker-peters

October, 9, 2012 AT 8:59 PM

Plugs replaced about 6 months ago along with coils
no vacuum keaks that I can tell wires for injectors look fine
fuel pressure is with in specs to the manual

Tiny

ASEMaster6371

October, 10, 2012 AT 1:14 AM

Did you have the injectors professionally cleaned? Not an additie but a real direct injection cleaning?

Roy

Tiny

danielwalker-peters

October, 10, 2012 AT 1:30 AM

No was going to hook up it tomorrow
also 1x1 ho2 sensor is bouncing from..00 to.8 rapidly would and o2 sensor cause this and not though any codes

Tiny

ASEMaster6371

October, 10, 2012 AT 2:44 AM

It is working normally and will not cause this code.

Roy

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