Exhaust comming out of air intake?
CF Veteran
Joined: Aug 2009
Posts: 1,047
Likes: 3
From: Hanover,Ont, Canada
Year: 1991
Model: Cherokee
Engine: 4.o
Do you think we misread this?? was the smoke in the air box exhaust? or did it flood and just back fire? by now the cyls would be washed, would like to know the results of the second compression test.
were the sparkplugs wet when you removed them?? Still leaning toward a valve issue. Just off topic for a sec, I opened up an 06 4.7l yesterday that was soo hot it dropped valve seats......little compression issue there
were the sparkplugs wet when you removed them?? Still leaning toward a valve issue. Just off topic for a sec, I opened up an 06 4.7l yesterday that was soo hot it dropped valve seats......little compression issue there
Last edited by captainwoot; Aug 21, 2009 at 05:16 PM.
CF Veteran
Joined: Mar 2009
Posts: 28,068
Likes: 6
From: Tenn. and Mich.
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
Uh-oh... Hoping for bad gauge, but here are my tests:
Series #1:
Pistons going from front to back
P1: 100
P2: 100
P3: 60
P4: 150
Series 2
Pistons from front to back
P1: 90
P2: 130
P3: 145
P4: 140
I checked them from back to front, actually (because that front cylinder is such a pain to get to the spark plug hole) and when I was done with the second series I went back to P4 and got 90...
If those records are accurate, what on earth does that mean is going on in there?
Oh, and just to clarify, if I left the gauge in the plug, reset, and test again it gave the same result. It was only when I came back later that it reported different.
Series #1:
Pistons going from front to back
P1: 100
P2: 100
P3: 60
P4: 150
Series 2
Pistons from front to back
P1: 90
P2: 130
P3: 145
P4: 140
I checked them from back to front, actually (because that front cylinder is such a pain to get to the spark plug hole) and when I was done with the second series I went back to P4 and got 90...
If those records are accurate, what on earth does that mean is going on in there?
Oh, and just to clarify, if I left the gauge in the plug, reset, and test again it gave the same result. It was only when I came back later that it reported different.
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
Alot of people asuming,including myself,that is funny,it even says it is a 2.5 in his discripition,good catch. I notice it last night I just assumed he did not check them all. But most things as far as issues still pertain.
Last edited by Abovetimberline; Aug 21, 2009 at 06:09 PM.
CF Veteran
Joined: Mar 2009
Posts: 28,068
Likes: 6
From: Tenn. and Mich.
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
I usually click on the details or check the profile before I open my mouth.
CF Veteran
Joined: Mar 2009
Posts: 28,068
Likes: 6
From: Tenn. and Mich.
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
Looking at those numbers it's apparent you don't have a piston/ring/valve/ head gasket problem. So it must be something else. I'm not familiar with those engines. Sorry.
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
CF Veteran
Joined: Aug 2009
Posts: 1,047
Likes: 3
From: Hanover,Ont, Canada
Year: 1991
Model: Cherokee
Engine: 4.o
Don't you think those #s are a little off?? You need at least 100psi to have decent combustion! That engine should be 125 -150psi across the board. They only allow 10% varience between cyls. cylhead, valves??
Thread
Thread Starter
Forum
Replies
Last Post
bradleyheathhays
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
9
Oct 21, 2024 09:27 AM
Turbocube
Modified XJ Cherokee Tech
34
Dec 10, 2015 03:46 PM
Zerocyde
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
Aug 24, 2015 10:56 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)