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mg_tf
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Discussion Starter #23
Looks like I'll be checking every electrical connection in the engine bay on Saturday now then. At least if it works out ok it'll a proper result. It would definitely answer why the CAT was glowing like rudolfs nose

Tubs
 

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The thread I posted the link to mentions a split exhaust flexible - might be something in that...
 

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Discussion Starter #25
Thanks Ian

I will check out all the air side hoses as well as all the electrical connections.

Cheers

Tubs
 

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Looks like I'll be checking every electrical connection in the engine bay on Saturday now then. At least if it works out ok it'll a proper result. It would definitely answer why the CAT was glowing like rudolfs nose

Tubs
Don't bank on it. Ive had these pop up now and again. Car runs fine. Make of that what you will.
 

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Discussion Starter #27
Don't bank on it. Ive had these pop up now and again. Car runs fine. Make of that what you will.
As much as you sound like the harbinger of doom, I am coming round to the startling realisation that owning the JC car will be al labour of love and bloody knuckles.:surprise::surprise::surprise:
 

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As much as you sound like the harbinger of doom, I am coming round to the startling realisation that owning the JC car will be al labour of love and bloody knuckles.:surprise::surprise::surprise:
Not really. Ive had mine for over four years and yes, it's not been without problems. That said they can mainly be attributed to poor maintenance from the past owners and general wear and tear.

You are right about bloody knuckles though. As you will see I am skeptical of OBD codes as even "experienced garages" seem to just change every thing till they get it fixed.

PS if mine had been a PITA it would have gone ages ago.
 

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Discussion Starter #29
The only saving grace is that the parts are relatively cheap and I'm fairly useful with the spanners, and as you say I'll have changed most bits systematically the longer we own it.

But getting it running with some consistency is the driving force at the minute.

Roll on Saturday

Tubs
 

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Discussion Starter #30
A quick update

I spent a couple of hours yesterday, cleaning every set of electrical connections and checking induction side hoses, I also removed and cleaned as best I could the IACV, fitted new fuel and air filters and I'm extremely happy to say that the misfiring has gone.

Took it for a quick spin yesterday afternoon without the engine cover on and scared the other half witless, covers back on and suddenly it's perfect again.

Thanks to everyone who has offered help and support

Cheers again

Tubs
 

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Discussion Starter #31
So after a week of faultless driving, the dreaded stuttering has returned. I've just run the diagnostic on it and its logged the P0300 misfire code. It's going in for it's MOT next week so I'm going to wait for the outcome before I rush headlong into more head scratching.

The diagnostic software has picked up that a possible issue with the exhaust sensors but they aren't bringing up and fault codes.

As confused as ever

Tubs
 

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Discussion Starter #32
A further update

JC had it's MOT yesterday and much to my surprise it passed. After setting the CAT alight i was convinced it would fail on its emissions, it just goes to show how paradoxical this car is.

It does however still have the infrequent misfire which is driving me mad, so I'll bite the bullet and change both the exhaust sensors a new IACV, and should all else fail a new ECU.

The local garage put it on their diagnostic machine and it came up with the same spurious misfire and a AC evaporator code which baffled me as it hasn't got AC, and they advised that the crank sensor may be temperamental, I will check they read out later for the codes as I didn't get much of a chance last night, and i'll post the actual codes list later.

Would a dodgy crank sensor give the symptoms of a misfire?

Yours a relatively chuffed

Tubs
 

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Would a dodgy crank sensor give the symptoms of a misfire?

Absolutely. If the crank sensor is dodgy, then at times it might not send the signal, which would show as a misfire.


The full name for the crank sensor is crank shaft position sensor, which is used in place of a distributor cap and rotor, which tells the engine when to fire which spark plug at the right time.
 

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Discussion Starter #36
Right a quick update

I have now changed the following parts

Coils and leads
MAP sensor
Cleaned every electrical plug and socket I could get to with contact cleaner.
New CSP sensor
Both Lambda sensors

And whilst the individual changes when they were changed seemed to improved the sporadic misfire initially it has always returned.

So it seems that if this is an ignition issue, the only thing left to change is the ECU, if it is an air leak on the induction side I need to change the gaskets and check all the hoses pertaining to the air side and a new IAVC. Otherwise if its on the low tension side it will be a loom change.

I'm still not 100% convinced that its not a semi blocked CAT but seeing as it sailed through its MOT and it emissions were ok that would perhaps exclude my theory.

All of which I am prepared to do but I would really like to narrow it down a little if I can.

If any of you has had or is finding the same problems and you have fixed them please let me know, otherwise I will just keep renewing it in the immortal words of Johnny Cash "One piece at a time"

Cheers

Tubs
 

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Discussion Starter #37
A final update (Hopefully)

Well after making all the changes listed above it seem I might have (everything crossed) found out the fundamental issue with the car. Seeing as I've only been driving it a mile to and from the station and back due to its malevolent nature the battery unsurprisingly run down and after not using it for a couple of days I went to move it Sunday morning and it was as flat as a pancake. Out with the jump leads and start her up no problem but I noticed the battery terminals were a little corroded so I decided to give them a little TLC and a nice smear of copper grease. This is where things started to improve my lot. Apart form a missing battery clamp (now ordered and will be here tonight for fitting) the negative terminal wouldn't actually clamp tightly on to the battery terminal. Being from an electrical background this minor technicality wasn't going to stop me I simple stripped up an old piece of flex wound the copper strands around the terminal and all clamped up nice and tight.
Restart the engine on jump leads and left it running for a bit all good, and started up no problem the following morning, I tested the battery at 13v and when running its 14v so all good.
So to close out a un-clamped battery will loosen your terminals (only the negative in my case) this will lead to a high resistance joint which may (and I am hoping) cause the ECU to lose the plot. Which may just manifest itself in my sporadic misfire. Well here's hoping.

All I can say is from a car that barely left the drive with out the full disco flashing lights to one that has been impeccable for 2 consecutive days, I will get a chance to give it a good test run at the weekend and will report the outcome.

So currently all is good with the JC car and apart from a binding caliper on the front but that's a completely different saga.
 

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A final update (Hopefully)

Apart form a missing battery clamp
I'm surprised the car passed its MOT with a missing battery clamp.
Mine failed purely on this (it was actually still there just not fitted)

Good news on your fix. Fingers crossed your problems are history.
 

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Discussion Starter #39
Please ignore the ramblings of an idiot.

So after my elation of the loose battery connection, I took it out for a proper test drive last night with a little bit of everything to put JC through its paces, all was fine till 2 miles home when the power fell away then came back on over 3000rpm. The warning light winking at me in a very gloating manner.

This mornings run to the station was what I've been used too light flashing /down on power then fine.

Time to hand it over to a garage to sort it out, has anyone any dealing with LMG in Bexleyheath? as they seem my closest specialist.

A very dispondant

Tubs
 
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