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JAGUAR X-TYPE 3.0 MAN MISFIRE PROBLEM RANDOM

Posted By sydneydean 10/7/2010 12:51:55 PM
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sydneydean
 Posted 10/7/2010 12:51:55 PM
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Had this jag now for 3 weeks &thought we solved the problem but just returned to us again now it all started with it misfire/heavy judder under extreme load/speed but progressed to random times,had codes P0303 cylinder 2/3 misfire,P0353 ignition coil c primary/secondary cicuit & P0303 checked out oxygen sensors & changed all under customer orders!! also changed bank 1 coils & all plugs as found backburned! all seamed good untill now but now its returned code p0420  cat system efficiency below threshold bank 1??? it will slightly misfire & throw up the warning light once again at extreme load ie 4th gear up steep hill but it will only flash the warning light & not store any codes,now dont want to throw customers money & my time all over again,any ideas pleeease!!!!! maybe cat??
Angus
 Posted 10/7/2010 5:39:21 PM
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Welcome to the forum.

Seems from the codes that you had a straightforward coil failure on cylinder 3 and driving with the misfire has probably damaged the cat.  What did the oxygen sensors have to do with it?

If the light is flashing, that warns that there is still a misfire being detected - there should be a code stored.  What are you reading it with?

.

sydneydean
 Posted 10/8/2010 5:17:21 AM
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Hi the oxygen sensors were replaced by customers orders after he came back from jag service asking us to change them as jag were to expensve! but the problem as you say seamed to lye with misfire on 3 cylinder,after checking coils all three coils on bank 1 were changed & it was fine for 2 weeks but the same problem returned (slight misfire & car holds back/judders) engine warning light flashes but then disapears,no codes stored?? we have checked the cats for temperture changes at front & rear & they are reading ok,also put through emissions check & all good! now that doesnt mean the cat fails at extreme load but cant seam to come to a reasonable answer! using the snap on solus epuiptment with advantage add on!! any other ideas welcome.
oldford
 Posted 10/8/2010 6:27:55 AM
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Have you tried reading with Generic EOBD and then checking "Long Term Fuel Trim"?
This could be a fueling problem possibly caused by a defective air mass sensor or false air.

Did you use original Oxygen sensors? Have you checked the signal from the Oxygen sensors?
10/8/2010 6:29:05 AM by oldford
sydneydean
 Posted 10/8/2010 6:40:49 AM
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yes read all through EOBD & nothing stored since orginal code P0420,went down the air mass rote & tried swopping for known good sensor (no change),used gen jag sensors & all are switching ok & at correct voltages.

Now the freeze frame data at orginal fault on fuel trim read as follows

short term trim bank 1 = 1.6

long term trim bank 1 = -3.6

short term bank 2 = 6.3

long term bank 2 = -1.5

a wee bit of differance between banks but cant work out why?? this problem will only occur flat out up long steep hills,slow off & retry and all seams good? still scratching head!!!

Angus
 Posted 10/8/2010 9:11:29 AM
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I'd be wondering if you had another coilpack going down?  You seem to have a little excess oxygen on bank 2 at idle.

Can you scope the primaries and the injector pulses and see if you have an oddball reading?

A flashing MIL is for a detected misfire - there should be a code somewhere.

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