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XJ Ask the Question Thread
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Could be a bad bulb. Could be a bad relay. Could be improper wiring.
Beach Bum
Joined: Jul 2011
Posts: 6,123
Likes: 22
From: Cape Hatteras, North Carolina
Year: 2000 WJ
Model: Grand Cherokee
Engine: 4.0
I have a question about checking the AC fuses in the PDC fuse box in the engine compartment.
There is an AC Compressor Clutch Relay
And Fuse #9 is labelled AC Clutch Relay
But, in the diagram legend/key in small print,
Fuse #9 also says something about Fuse #27 (sentry key immoibilzer)
Why would Fuse #9 refer to another fuse? What does that even mean?
Engine Bay Fuse Box (PDC)
There is an AC Compressor Clutch Relay
And Fuse #9 is labelled AC Clutch Relay
But, in the diagram legend/key in small print,
Fuse #9 also says something about Fuse #27 (sentry key immoibilzer)
Why would Fuse #9 refer to another fuse? What does that even mean?
Engine Bay Fuse Box (PDC)
Last edited by BimmerJeeper; Dec 26, 2013 at 06:57 PM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
The system is designed to operate at speeds above 30 mph (50 km/h).
To store a set speed, depress the SET switch while the vehicle is moving at a speed between 35 and 85 mph
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
The spark plug is oily. I had a misfire cylinder 3 code and did a compression test and got a dry result of 30 and a wet result of 100 plus had oil in coolant. Not a cracked head and all the people I asked all suggested blown head gasket. (Which is why I pulled the 9 month old head off). All the other chambers look fine. Just number three cylinder (which was pictured) is the only one I'm wanting to get figured out and fixed before I put it back together.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
The spark plug is oily. I had a misfire cylinder 3 code and did a compression test and got a dry result of 30 and a wet result of 100 plus had oil in coolant. Not a cracked head and all the people I asked all suggested blown head gasket. (Which is why I pulled the 9 month old head off). All the other chambers look fine. Just number three cylinder (which was pictured) is the only one I'm wanting to get figured out and fixed before I put it back together.




