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Author Topic: Passed MOT but runs like a bag of shit.  (Read 3366 times)

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Pembrokeshire-Wj

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Passed MOT but runs like a bag of shit.
« on: August 08, 2011, 09:39:36 AM »
Hi everyone.
just got my Jeep through the Mot but now it's backfiring spluttering etc,it drove fine to and from the test but on the way back from the post office it started to play up.
I've just recently changed crank & cam sensors and a new battery, the check engine light is on and the code thrown up on the dash is P0340 cam sensor ?? do i need to get the codes erased for the system to  run correctly.
Thanks.
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Cockney Boy

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Re: Passed MOT but runs like a bag of shit.
« Reply #1 on: August 08, 2011, 09:55:37 AM »
I'd say if the cam sensor is going to ground then it needs changing. And doing that before you do some real damage to the engine
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JamesH

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Re: Passed MOT but runs like a bag of shit.
« Reply #2 on: August 08, 2011, 11:52:45 AM »
I recently changed my cam sensor and the code disappeared as soon as I changed the part and fired it up. Did you buy a non-genuine sensor? I'm led to believe that 3rd party sensors can cause problems. When my cam sensor went it killed the engine, there was no rough running, just cut power to the coil.
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Pembrokeshire-Wj

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Re: Passed MOT but runs like a bag of shit.
« Reply #3 on: August 08, 2011, 08:33:52 PM »
Thanks for the replies.
I'm going to take to a mechanic friend tomorrow and get the codes cleared from the  ecu.
i'll update as to what we find :icon_biggrin:
cheers.
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tim_aka_tim

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Re: Passed MOT but runs like a bag of shit.
« Reply #4 on: August 08, 2011, 08:43:03 PM »
Go onto Amazon.co.uk and buy yourself a 20 quid obdii scanner. They will read and reset your CELs.
That goes for everyone who reads this, just do it!
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Pembrokeshire-Wj

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Re: Passed MOT but runs like a bag of shit.
« Reply #5 on: August 09, 2011, 01:49:16 PM »
Hi all.
Just got back from getting my code reader and it's still running shite,with a nice bacolite smell coming from the engine,plugged the reader in and it looks like the coil pack has failed and by the temperature of one of the coils it's got to be the pack.
Question should i buy new or go for second hand as there are  a few on Ebay.
Thanks.
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Dave69

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Re: Passed MOT but runs like a bag of shit.
« Reply #6 on: August 09, 2011, 10:10:04 PM »
new coil
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XJ 2.5 diesel - dead. XJ 4.0 6" lift - sold to some lucky person
CJ7 4.2 auto standard(ish)
Alfa 147 jtdm

Pembrokeshire-Wj

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Re: Passed MOT but runs like a bag of shit.
« Reply #7 on: August 09, 2011, 10:34:29 PM »
Yep new coil pack it is,i have one winging it's way to me right now.
hopefully this will sort it out as i'm getting pissed off driving a shite Mondeo :078:
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Dave69

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Re: Passed MOT but runs like a bag of shit.
« Reply #8 on: August 10, 2011, 07:42:36 PM »
 :iagree:
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XJ 2.5 diesel - dead. XJ 4.0 6" lift - sold to some lucky person
CJ7 4.2 auto standard(ish)
Alfa 147 jtdm

Pembrokeshire-Wj

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Re: Passed MOT but runs like a bag of shit.
« Reply #9 on: August 10, 2011, 11:28:15 PM »
OK new coil pack installed drives fine for a while.If you stop the engine and leave it for 5 it has a misfire and throws up code PO353 ignition coil C Primary/ Secondary Circuit malfunction.
Same as before with the old  coil pack ,ok the one i bought was from a dismantler with a garantee but why would the same bloody code come up again.
any ideas as this is driving me nuts, i love my jeep but this is taking the piss.
 :011: :011: :011: :011:
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Mike Pavelin

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Re: Passed MOT but runs like a bag of shit.
« Reply #10 on: August 11, 2011, 06:48:51 AM »
I had this happen on a late TJ. It was the crank sensor.
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Pembrokeshire-Wj

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Re: Passed MOT but runs like a bag of shit.
« Reply #11 on: August 11, 2011, 07:20:00 PM »
Hi all.
I've changed the crank & cam sensors,plugs,new battery etc.
I'm running out of ideas :100:
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