Hello
I have been trying to fix this for some time.
Feels like i'm not running on 6 cylinders. Gutless
>1998
XJ 4.0
5 speed
Stock
177K
Jeep dealer couldn't find problem and didn't want me throwing money at it. Since I reset the PCM Jeep dealer couldn't review any history.
No codes
Power loss, struggles to accelerate. Same in each gear
Idles well no dips, spikes etc.
Power loss seemed to come suddenly about 2 years ago after a wash, but 2 years later I'm sure I'm forgetting some details.
Drives dependably, always starts with no recent hiccups.
What I've done to date.
No codes/stored
Fuel trim both short and long term are with in spec.
New Cat, muffler
New Crankshaft sensor
New O2 (Bosch) up and downstream
New plugs, wires, distributer
Throttle body cleaned
IAC cleaned
New TPS sensor, then replaced back to original when it drove same.
New MAP sensor then replaced back to original when it drove same.
Fuel pressure is 49 at rail
Compression 150, with very slight variation
Vacuum tested good
Plugs looked fine after 2k replaced. Not rich. All consistent with each other.
No back fire
Gas milage bad
Fuel injectors cleaned
Tested spark- all good
Tested fuel injectors with noid light- all good
Coil is original and within spec
Besides O2 codes (which were both replaced) no other stored error codes
Ran gutless before upsteam O2 showed code. Was replaced with same result.
When O2 showed code it also blew the 15 amp @PDC. After new O2 and fuse it was back to normal gutless.
From my Torque app I get error message but I've read that error was pretty common.
TiD: $11 CID: $01
Min:56
Current:13
Test result said "not Ok"
When checking temp at header, cylinders 2/3/4 seem to be running cooler 250f to 400f (+-50). This was only thing that i could find.
Again this was a sudden change. Has not gotten worse nor improved.
Thanks in advance
I have been trying to fix this for some time.
Feels like i'm not running on 6 cylinders. Gutless
>1998
XJ 4.0
5 speed
Stock
177K
Jeep dealer couldn't find problem and didn't want me throwing money at it. Since I reset the PCM Jeep dealer couldn't review any history.
No codes
Power loss, struggles to accelerate. Same in each gear
Idles well no dips, spikes etc.
Power loss seemed to come suddenly about 2 years ago after a wash, but 2 years later I'm sure I'm forgetting some details.
Drives dependably, always starts with no recent hiccups.
What I've done to date.
No codes/stored
Fuel trim both short and long term are with in spec.
New Cat, muffler
New Crankshaft sensor
New O2 (Bosch) up and downstream
New plugs, wires, distributer
Throttle body cleaned
IAC cleaned
New TPS sensor, then replaced back to original when it drove same.
New MAP sensor then replaced back to original when it drove same.
Fuel pressure is 49 at rail
Compression 150, with very slight variation
Vacuum tested good
Plugs looked fine after 2k replaced. Not rich. All consistent with each other.
No back fire
Gas milage bad
Fuel injectors cleaned
Tested spark- all good
Tested fuel injectors with noid light- all good
Coil is original and within spec
Besides O2 codes (which were both replaced) no other stored error codes
Ran gutless before upsteam O2 showed code. Was replaced with same result.
When O2 showed code it also blew the 15 amp @PDC. After new O2 and fuse it was back to normal gutless.
From my Torque app I get error message but I've read that error was pretty common.
TiD: $11 CID: $01
Min:56
Current:13
Test result said "not Ok"
When checking temp at header, cylinders 2/3/4 seem to be running cooler 250f to 400f (+-50). This was only thing that i could find.
Again this was a sudden change. Has not gotten worse nor improved.
Thanks in advance