Sputtering
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Joined: Mar 2010
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From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
You also need to take a look at your CPS. It is located on the bell housing-driveside-top. This can cause ALOT of issues and are known to "gradually" fail. If it were a fuel pump issue it is either it works or it doesnt about 99% of the time. Take a fuel pressure reading and see what you get. it may be a clogged filter-its almost always neglected.
Good advice on the o2 sensors. Mine did the grounding out on the upstream one too, but if that fuse blows/pops then the vehicle will not run at all. But the o2 sensor will cause rough running, or a to lean/to rich issue. but it should throw a code....
Next thing to check is your MAP sensor. i had an issue few weeks ago when going from 4000 feet to 9000 feet in a 16 mile uphill. Once i got to the top and shut the vehicle the map sensor did not take into account the thinner air right away so it cause it to run to rich and run like crap(once it did run) and then once the map sensor adjusted to the thinner air all was well...
Good advice on the o2 sensors. Mine did the grounding out on the upstream one too, but if that fuse blows/pops then the vehicle will not run at all. But the o2 sensor will cause rough running, or a to lean/to rich issue. but it should throw a code....
Next thing to check is your MAP sensor. i had an issue few weeks ago when going from 4000 feet to 9000 feet in a 16 mile uphill. Once i got to the top and shut the vehicle the map sensor did not take into account the thinner air right away so it cause it to run to rich and run like crap(once it did run) and then once the map sensor adjusted to the thinner air all was well...
Thread Starter
Senior Member
Joined: Mar 2010
Posts: 693
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From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
New Update
Installed a new cps same problem then switched pcm same thing so far the following is new or known to work from parts jeep that runs but trans is out
CPS
MAP
IAC
Plugs
Fuel Filter
Fuel Pump
Injectors
Plug Wires
Coil
Distributor Cap and Button
Throttle Body and Sensors
New thing learned the harness going to PCM when jiggled electric fan works but motor does not run... Jiggle again no fan but engine runs (like CRAP)
CPS
MAP
IAC
Plugs
Fuel Filter
Fuel Pump
Injectors
Plug Wires
Coil
Distributor Cap and Button
Throttle Body and Sensors
New thing learned the harness going to PCM when jiggled electric fan works but motor does not run... Jiggle again no fan but engine runs (like CRAP)
Caracticus Potts The Mod
Joined: Jul 2009
Posts: 5,298
Likes: 9
From: Hainsville, NJ
Model: Grand Cherokee
remove every wire coming out of that aftermarket alarm, and toss it in the can. If any factory wires are cut and spliced into that alarm just make sure you reconnect them to there proper location.
Thread Starter
Senior Member
Joined: Mar 2010
Posts: 693
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From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
Thread Starter
Senior Member
Joined: Mar 2010
Posts: 693
Likes: 0
From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
Ok i will try it but if that aint it i dont know what im gonna do probably beat the crap out of it and sell it to a junk yard
Thread Starter
Senior Member
Joined: Mar 2010
Posts: 693
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From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
ripped out the aftermarket alarm all wires are back to the stock setup still same thing i think it is the connections where the harness goes to pcm got a new end gonna put it on tomorrow and update then
Newbie
Joined: Apr 2010
Posts: 15
Likes: 0
From: Colorado Springs
Year: 1998
Model: Cherokee
Engine: 4.0 inline 6
Have you tried the o2 sensors yet? I checked literally everything before I even considered them and sure enough that's what it was. Just saying it's worth a shot. You can always take out the upstream sensor and drive around the block without it. It will cause the engine to run rich but it will determine if that's your problem.
Thread Starter
Senior Member
Joined: Mar 2010
Posts: 693
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From: Carrollton, Georgia
Year: 1995
Model: Cherokee
Engine: 4.0 Liter High Output
Have you tried the o2 sensors yet? I checked literally everything before I even considered them and sure enough that's what it was. Just saying it's worth a shot. You can always take out the upstream sensor and drive around the block without it. It will cause the engine to run rich but it will determine if that's your problem.
but still same issue mess with pcm electric fan kicks on and some other electronics work but no ignition mess with it again and ignition but no electric fan i am getting ticked to the point of scrapping it and buying a new one
Newbie
Joined: Apr 2010
Posts: 15
Likes: 0
From: Colorado Springs
Year: 1998
Model: Cherokee
Engine: 4.0 inline 6
I actually have to do the same thing on my jeep due to a faulty check valve in the fuel pump. I dont remember have you checked your fuel pressure yet?
Newbie
Joined: Apr 2010
Posts: 15
Likes: 0
From: Colorado Springs
Year: 1998
Model: Cherokee
Engine: 4.0 inline 6
im not sure how it is where your located, but here in colorado i just go to the closest autozone and they have tools (including a fuel pressure gauge that they let me borrow and test in the parking lot). Most of the auto parts stores around here do the same
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