Bogging under exceleration
11-01-2014, 03:34 PM
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Bogging under exceleration
We'll been having some issue with my 99 jeep Cherokee. It is a 4.0L and Was an Auto. When the symptoms started if felt like my auto was starting to slip so I proceed with the Trans swap to an AX-15. This issue is still persisting. It is like the jeep has a governor on it. I cant get over 20 miles per hour and the engine makes a bogging slash vac leak sound. It is the original Exhaust from 99 I am wondering if it could be the cat ?
Anyone have any thoughts.
Anyone have any thoughts.
11-01-2014, 04:18 PM
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Year: My Jeep is a GMC
"Anyone have any thoughts."
Why change out the transmission for an engine related problem? Automatics are so much nicer than manual transmission unless it's only for a special purpose / weekender / sunny day vehicle.
The bog could be related to an old cat stuck in the exhaust system (they crawl in there cus it's warm) but more importantly what is the fuel pressure in psi?
Why change out the transmission for an engine related problem? Automatics are so much nicer than manual transmission unless it's only for a special purpose / weekender / sunny day vehicle.
The bog could be related to an old cat stuck in the exhaust system (they crawl in there cus it's warm) but more importantly what is the fuel pressure in psi?
11-01-2014, 05:35 PM
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This the first auto I have owned. So I had plans to swap my 5 speed In. The auto was slipping for time to time, shifting hard Prior to this starting. So I just thought it was the trans.
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11-03-2014, 07:58 AM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CRUISER’S VACUUM TEST FOR EXHAUST RESTRICTION
Your vacuum gauge should come with an instruction booklet outlining the procedure. Hook the vacuum gauge up to a source on the intake manifold. Start the engine and note the vacuum reading. Usually 17 to 21 inches of vacuum. Throttle the engine up to 2,000 to 2,500 RPM for 20 seconds or so and the vacuum reading should stabilize to the same reading you got at idle. Let the throttle snap shut. The vacuum reading should shoot up about 5 inches of vacuum higher for a second and then come quickly down to the original reading. If the vacuum reading stays high and comes down slowly with jerky needle movements, you have an exhaust restriction.
Your vacuum gauge should come with an instruction booklet outlining the procedure. Hook the vacuum gauge up to a source on the intake manifold. Start the engine and note the vacuum reading. Usually 17 to 21 inches of vacuum. Throttle the engine up to 2,000 to 2,500 RPM for 20 seconds or so and the vacuum reading should stabilize to the same reading you got at idle. Let the throttle snap shut. The vacuum reading should shoot up about 5 inches of vacuum higher for a second and then come quickly down to the original reading. If the vacuum reading stays high and comes down slowly with jerky needle movements, you have an exhaust restriction.
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