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Jeep specialists close to Glasgow?


Zach Oneill

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What I thought was hopefully going to be just an issue with O2 sensors has gradually started driving my insane so looking to see if anyone has any suggestions of Chrysler or Jeep specialist garages north of the border or closer to Glasgow that can work on older TJ’s. I doubt any dealer would really have a clue with it as it’s an 04. I know ACD has techs around Lancashire but given I think my problem was brought on by a long drive I’m trying to avoid stressing the old girl hahah

 

-Zach 

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Zach, can you describe the fault your Jeep has? Have you got an OBD2 scanner to read the Diagnostic Trouble Codes (DTCs)?

 

Your earlier post says that your TJ had a problem stalling. Without driving it or seeing the DTCs reported, I reckon this could be your Crankshaft Position Sensor (CPS) failing. The sensor gets hot and it and it's wiring harness degrade with age. I can't remember if it is easier to do on a TJ or not, it is fiddly on a XJ, but the same process. See this video.

 

If your Jeep has jerky running and generally doesn't respond as expected to how you are pressing the accelerator pedal this could be the Throttle Position Sensor (TPS) failing. If it is idling roughly and stalling while idling it could be the Idle Air Control (IAC). TPS and IAC Video.

 

Depending on mileage, changing the oxygen sensors is worth doing every 3 or more years to keep the fuel economy and performance optimal. A ten year old oxygen sensor will waste more fuel in a year than the cost of it's replacement. I always buy Bosch sensors from RockAuto.com , they are usually cheaper and better quality than the no-name sensors found in the UK.

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Yeah it’s got no codes or lights at all. I’m getting a huge range of symptoms from stalling at lights (I’ve cleaned the throttle body and IAC however am going to replace), to having no power occasionally and limited acceleration. I’ve been talking with some guys on the wrangler tj forum which has been really helpful but getting to the point now I just need it sorted. I purchased it and the guy said it ran brilliantly which I don’t question he was a genuine guy but after driving it home from wales to Glasgow I noticed some strange behaviour notably fluctuating power on the motorway and loss of power after coming off. I had originally thought it was simply something to do with driving at speed and thought about TCC issues but it’s happened at other times also. After replacing O2 sensors I took it a drive about an hour from home and noticed acceleration locking up about 40mph which reset after a restart , so I’m presuming it’s entering limp mode for some reason which kind of makes me think transmission or PCM related faults. It’s just a really hard to diagnose issue, I’ve had it at two garages and they’ve had no clue. The next thing on my list was fuel pump but I’m doubting it would cause it to go into limp mode or cause the breadth of issues I’m having

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4 hours ago, Zach Oneill said:

The next thing on my list was fuel pump but I’m doubting it would cause it to go into limp mode or cause the breadth of issues I’m having

 

I was just about to suggest checking the fuel pump. I think fluctuating fuel pressure could be a possibility.

 

I have just had a fuel pump die on an XJ that was stored for most of last year with half a tankful of E5. It has never had any E10 in it and the fuel pump and filter were 3 years old. I have not removed the pump yet but I won't be surprised if the internals are rusty. It had been started regularly over the year and was running for 20 minutes on the day that it failed.

 

I have just remembered that my TJ had a mysterious problem similar to yours for a few months. The field fix was to grab the wiring loom on the bulkhead near the back of the engine and give it a shake. I can't remember if the CPS was changed before or after but I changed something and the problem went away without me noticing when exactly.

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