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Unread 05-04-2009, 02:15 PM   #1
HankyDanky
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1989 XJ Cherokee 
 
Join Date: Jun 2008
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89 Cherokee Sudden Loss Of Power.

Went to go somewhere today and there is a huge loss of power. Did a compression test and all looked good, inspected vacuum lines, spark plugs, wires and anything else that could have come loose in the engine bay. Last time I drove it, it was completly fine. Let it warm up to op temp and still the same power loss. Any ideas? Fuel pump is newer and same as filter, about 6 months old.

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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.

Last edited by HankyDanky; 05-04-2009 at 04:24 PM..
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Unread 05-04-2009, 04:23 PM   #2
HankyDanky
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Replaced fuel filter, cap and wires are all fine. I know because it gave me a nice jolt of electricity.

When I floor it, thats when I have a power loss. Seems like the engine is running completely fine... I am going to test the PSI on the fuel line and see what I get.
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-04-2009, 04:25 PM   #3
beneharris
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if your flooring it and its bogging down it seems like a fuel pump/filter thing.
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1995 Jeep Cherokee- 5" lift, Locked Up Fab Long arms, 31" Km2's. AA SYE kit, with Xj front driveshaft. Dual 12" Pioneer Subs
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Unread 05-04-2009, 04:26 PM   #4
HankyDanky
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Quote:
Originally Posted by beneharris View Post
if your flooring it and its bogging down it seems like a fuel pump/filter thing.
There is a bit of hesitation every time I press the gas. Kinda like it is not getting enough gas to the fuel rail in time.. Hmm..
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-04-2009, 06:24 PM   #5
HankyDanky
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Fuel pressure was good....

I can not see what else it could be. Common guys, I know you have some ideas here..
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-04-2009, 06:27 PM   #6
Grinola
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It must be something in the fuel delivery system or the distributor isnt advancing. I think you said you checked the air filter. Caould be mass airflow sensor too.
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Unread 05-04-2009, 06:54 PM   #7
XJoutlaw
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clogged injecters?
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Unread 05-04-2009, 06:56 PM   #8
HankyDanky
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Quote:
Originally Posted by XJoutlaw View Post
clogged injecters?
Naw, they were replaced about 100-200 miles ago. All new, threw some injector cleaner into the gas tank as well though.
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-05-2009, 12:25 AM   #9
HankyDanky
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Any thoughts about possibility of going into limp mode? Transmission? Seems like it shifts quicker through gears than normal....
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-05-2009, 12:38 AM   #10
XJoutlaw
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From what I know that wouldnt bog you down how bout clogged fuel lines or a bad regulator
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Unread 05-05-2009, 12:59 AM   #11
HankyDanky
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Quote:
Originally Posted by XJoutlaw View Post
From what I know that wouldnt bog you down how bout clogged fuel lines or a bad regulator
Doesnt really bog down, think that was a bad choice of words. There is just no power there. Couldnt be the reg or lines or the PSI test would have shown. I read that if the trans fluid gets to low then it can go into limp mode, or could be a restriction on the exhaust I missed.. I am going to check those next the next couple days and see what I find.
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-05-2009, 08:45 AM   #12
1deadeye
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Check your tps and map sensor.
Scooter
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Unread 05-05-2009, 06:29 PM   #13
XJoutlaw
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Mines been doing something simlar it wont like idle and move like it use to and it takes extra skinny pedal to get up and go my dad said check the tranny fluid so I am.
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Unread 05-07-2009, 06:45 PM   #14
HankyDanky
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Checked the TPS, replaced the IAC, checked the tranny fluid and cleaned out the air intake with some sea foam.

STILL NOTHING!

Checked the MAP sensor... teminal A had a reading of 5.2 volts, terminal B had a reading of .2 volts and C is the ground..

The wiring is tied into the main harness for the Map Sensor plug and thats what I tested so what chould I be looking for now?
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1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
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Unread 05-07-2009, 10:33 PM   #15
1deadeye
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Here is a link for the Renix ignition. It shows you testing for the renix ignition.

http://jeep.zerok.ru/index.php?page=21

Is your exhaust plugged. Bad cat.
Scott
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