Does this look bad?
CF Veteran
Joined: Jan 2009
Posts: 1,242
Likes: 4
From: Northfield MN
Year: 1995
Model: Grand Cherokee
Engine: 5.2 v8
I would also agree on doing plugs, wires, cap, and rotor with a seafoam treatment.
Just a small reminder if you get the cap and stuff (not sure why you wouldn't lol) make sure it has brass terminals.
Also I know you said you cleaned the butterfly, but did you do the rest of the tb as well?
Just a small reminder if you get the cap and stuff (not sure why you wouldn't lol) make sure it has brass terminals.
Also I know you said you cleaned the butterfly, but did you do the rest of the tb as well?
Thread Starter
Junior Member
Joined: Dec 2012
Posts: 99
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Champion Copper plugs are good. Something is wrong! Gap the new to .035.
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
Junior Member
Joined: Dec 2012
Posts: 99
Likes: 0
I would also agree on doing plugs, wires, cap, and rotor with a seafoam treatment.
Just a small reminder if you get the cap and stuff (not sure why you wouldn't lol) make sure it has brass terminals.
Also I know you said you cleaned the butterfly, but did you do the rest of the tb as well?
Just a small reminder if you get the cap and stuff (not sure why you wouldn't lol) make sure it has brass terminals.
Also I know you said you cleaned the butterfly, but did you do the rest of the tb as well?
CF Veteran
Joined: Jan 2009
Posts: 1,242
Likes: 4
From: Northfield MN
Year: 1995
Model: Grand Cherokee
Engine: 5.2 v8
CF Veteran
Joined: Jan 2009
Posts: 1,242
Likes: 4
From: Northfield MN
Year: 1995
Model: Grand Cherokee
Engine: 5.2 v8
Take another snap shot if you can!
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Thread Starter
Junior Member
Joined: Dec 2012
Posts: 99
Likes: 0
Champion Copper plugs are good. Something is wrong! Gap the new to .035.
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!
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Yessir' The MAP thought you had it floorboarded. (vacuum plummets with the throttle open) I have it the map "roughs out" the mixture with the temp sensors. Intake air, and coolant, then the 02 sensor helps put the final touch on it. Something like that anyway.
Power, that's the Idle Air Control. IAC The "butterfly" in the TB is all but closed at idle. It has an air passage and a little motor that (a Renix), ECU controls. (91 on, call it a PCM).
Power, that's the Idle Air Control. IAC The "butterfly" in the TB is all but closed at idle. It has an air passage and a little motor that (a Renix), ECU controls. (91 on, call it a PCM).
Last edited by DFlintstone; Feb 25, 2013 at 10:54 PM. Reason: IAC!
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