Map Sensor Issues.
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CF Veteran
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From: Wilmington,NC
Year: 1989
Model: Cherokee
Engine: 4.0
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Aug 2011
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From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
OfreCristSakesPeople! Drivers side. 
"Hell, I forgot what I had for dinner earlier this evening" Did you get those brownies I sent?...
"Hell, I forgot what I had for dinner earlier this evening" Did you get those brownies I sent?...
Last edited by DFlintstone; Nov 19, 2013 at 09:38 PM.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Please describe "Flipped" Slim. Pete, any chance a restricted exhaust might be an issue?
Also Slim, have you checked that brittle little tube to your MAP? Mine about crumbled when I touched it. It is supper crucial, and fragile.
Drivers side, brown with white stripe.
Slim had said after it warms up. Put a vacuum gauge on it maybe, rule that out. ..
Also Slim, have you checked that brittle little tube to your MAP? Mine about crumbled when I touched it. It is supper crucial, and fragile.
Slim had said after it warms up. Put a vacuum gauge on it maybe, rule that out. ..
Thread Starter
CF Veteran
Joined: May 2012
Posts: 3,004
Likes: 1
From: Wilmington,NC
Year: 1989
Model: Cherokee
Engine: 4.0
Thread Starter
CF Veteran
Joined: May 2012
Posts: 3,004
Likes: 1
From: Wilmington,NC
Year: 1989
Model: Cherokee
Engine: 4.0
Please describe "Flipped" Slim. Pete, any chance a restricted exhaust might be an issue?
Also Slim, have you checked that brittle little tube to your MAP? Mine about crumbled when I touched it. It is supper crucial, and fragile.
Drivers side, brown with white stripe.
Slim had said after it warms up. Put a vacuum gauge on it maybe, rule that out. ..
Literally flipped lol. Exhaust sux (sounds like a pissed off bumble bee) but not messed up. The tube is fine I just replaced it.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Hey, you broke one of those rules..let me think...OH! I remember, "Keep the rubber side down" That's the one.
There is a brittle little tube. It comes out of a rubber plug, low on the engine side of the throttle body. It runs back to the firewall, then up to your MAP sensor sort of high up there near center on the firewall. CRUCIAL!! The MAP will tell the ECU to dump fuel with less/no vacuum. Any crack or blockage and it will be pig-rich. (black smoke, fouled black plugs). You can pull the line off the MAP and feel for vacuum with your finger. If it runs!
There is a brittle little tube. It comes out of a rubber plug, low on the engine side of the throttle body. It runs back to the firewall, then up to your MAP sensor sort of high up there near center on the firewall. CRUCIAL!! The MAP will tell the ECU to dump fuel with less/no vacuum. Any crack or blockage and it will be pig-rich. (black smoke, fouled black plugs). You can pull the line off the MAP and feel for vacuum with your finger. If it runs!
Thread Starter
CF Veteran
Joined: May 2012
Posts: 3,004
Likes: 1
From: Wilmington,NC
Year: 1989
Model: Cherokee
Engine: 4.0
Hey, you broke one of those rules..let me think...OH! I remember, "Keep the rubber side down" That's the one.
There is a brittle little tube. It comes out of a rubber plug, low on the engine side of the throttle body. It runs back to the firewall, then up to your MAP sensor sort of high up there near center on the firewall. CRUCIAL!! The MAP will tell the ECU to dump fuel with less/no vacuum. Any crack or blockage and it will be pig-rich. (black smoke, fouled black plugs). You can pull the line off the MAP and feel for vacuum with your finger. If it runs!
There is a brittle little tube. It comes out of a rubber plug, low on the engine side of the throttle body. It runs back to the firewall, then up to your MAP sensor sort of high up there near center on the firewall. CRUCIAL!! The MAP will tell the ECU to dump fuel with less/no vacuum. Any crack or blockage and it will be pig-rich. (black smoke, fouled black plugs). You can pull the line off the MAP and feel for vacuum with your finger. If it runs!
ol gal run for about 5 minutes b4 I shut her off. No engine knock or anything runs pretty good . I did replace the map line awhile back. 
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