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Author Topic: Engine Misfiring & Cutting Out  (Read 1658 times)

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kentman99

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Engine Misfiring & Cutting Out
« on: 27 April 2009, 12:04:39 »
I'm hoping for some advice as ive just bought an 1999 2.5 V6 estate on ebay. I haven't even driven (or seen it!) yet but everything appears okay except the current owner says the engine is misfiring. He was told the most likely cause is the rocker cover gasket.....not sure if this sounds right. I have to drive it about 50 miles home tonight but I'm told at motorway speeds its less of an issue. Apparently it tends to misfire more at low speeds and cuts out but always restarts okay. I intend to take it to a garage straightaway but if i'm able to point them in the right direction for the most likely cause it would help. Not sure if this is relevant but its a manual and has 137k miles.  I almost bought a 2 litre auto yesterday but when test driving it jumped out of gear!  The fella that owned it reckoned he'd had it all checked out and the most likely cause was low transmission fluid as nothing else appeared wrong when checked on a diagnostic machine.

Thanks
Nick
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MutantCav

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Re: Engine Misfiring & Cutting Out
« Reply #1 on: 27 April 2009, 12:16:31 »
Guy is probably right...oil in plug wells as a result of leaking cam cover gaskets...causes plugs and/or leads and/or dispack to start failing depending on how long its been left misfiring...

Cutting out when idling may be the AICV needing cleaning or coiuld just be as a result of the misfiring...

Should be fine to get you home anyway...easy enough job to tackle yourself when you do :y
« Last Edit: 27 April 2009, 12:17:29 by ShieldOfSteel »
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MutantCav

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Re: Engine Misfiring & Cutting Out
« Reply #2 on: 27 April 2009, 12:20:05 »
And with the auto...guy was probably right but really if he has had it on diagnostics then he already knew about the fault and could have just topped it up if he wanted to sell the car rather than hoped it wouldnt happen while being test driven...
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ians

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Re: Engine Misfiring & Cutting Out
« Reply #3 on: 27 April 2009, 12:56:43 »
Quote
And with the auto...guy was probably right but really if he has had it on diagnostics then he already knew about the fault and could have just topped it up if he wanted to sell the car rather than hoped it wouldnt happen while being test driven...

I don't buy that either.  Surely you would top it up before selling in that case.
« Last Edit: 27 April 2009, 12:57:24 by ians »
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kentman99

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Re: Engine Misfiring & Cutting Out
« Reply #4 on: 27 April 2009, 18:26:56 »
Thanks for the info guys it's very much appreciated. Ive just had a chat on the phone with the seller and basically the misfiring started on a long drive home from cornwall. His garage were using the rocker cover gasket as a starting point as there was an obvious leak but I think it was going to be a process of elimination rather than a definitive answer to the problem. He was quoted £250 to do it.
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alexandjen

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Re: Engine Misfiring & Cutting Out
« Reply #5 on: 27 April 2009, 18:37:04 »
Quote
Thanks for the info guys it's very much appreciated. Ive just had a chat on the phone with the seller and basically the misfiring started on a long drive home from cornwall. His garage were using the rocker cover gasket as a starting point as there was an obvious leak but I think it was going to be a process of elimination rather than a definitive answer to the problem. He was quoted £250 to do it.

Did he say if the EML is on or not?
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TheBoy

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Re: Engine Misfiring & Cutting Out
« Reply #6 on: 27 April 2009, 18:41:18 »
When you get it home, paperclip it. If no relevent fault codes stored, suspect HT side.
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kentman99

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Re: Engine Misfiring & Cutting Out
« Reply #7 on: 28 April 2009, 00:01:07 »
well ive just got home after driving it about 65 miles and have made it back in one piece! The car was generally in good condition and the interior had held up very well but the misfire was far worse than i expected. It idles like a dog and did cut out a couple of times on roundabouts, but that said once i was cruising along the motorway it ran far smoother with only the occasional spells of lumpiness. The other thing suggested as the cause of the problem was head gasket failure but there were no tell tale signs of that ie overheating, creamy oil filler cap etc. The other major problem which went undeclared on the ebay listing was the brakes. As I went to drive away there was a jolt as the brakes released but things got lots when i wanted to stop. There was a horrible grinding noise and vibration through the pedal and then the pedal wouldn't depress and i had no brakes! Fortunately it then freed itself and the brakes worked. When i got out of the car there was a horrible burning smell from the offside rear wheel arch. I'm not handy at all with cars so I just hope when the garage ring me tomorrow its not going to be mega bucks.  There were no eml on by the way
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MutantCav

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Re: Engine Misfiring & Cutting Out
« Reply #8 on: 28 April 2009, 07:36:03 »
Quote
Quote
And with the auto...guy was probably right but really if he has had it on diagnostics then he already knew about the fault and could have just topped it up if he wanted to sell the car rather than hoped it wouldnt happen while being test driven...

I don't buy that either.  Surely you would top it up before selling in that case.
Isnt that what I said?? lol
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MutantCav

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Re: Engine Misfiring & Cutting Out
« Reply #9 on: 28 April 2009, 07:40:43 »
If oil leak from cam covers and no EML then as said its the HT side...

First of all the cam covers will need doing and the breather system cleared...then start with cheapest (spark plugs) then leads then if not cured dispack...the oil in the plug wells if left for too long will have caused some or all of these to fail...

As for brake, sounds like cars been sat a while so brake has started to bind...see what the garage says but if not too bad then some grease to free it up may well do the trick :y
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kentman99

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Re: Engine Misfiring & Cutting Out
« Reply #10 on: 28 April 2009, 12:04:03 »
Thanks again for the help and i'll keep you posted on what the garage says.
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ians

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Re: Engine Misfiring & Cutting Out
« Reply #11 on: 28 April 2009, 12:30:44 »
Quote
Quote
Quote
And with the auto...guy was probably right but really if he has had it on diagnostics then he already knew about the fault and could have just topped it up if he wanted to sell the car rather than hoped it wouldnt happen while being test driven...

I don't buy that either.  Surely you would top it up before selling in that case.
Isnt that what I said?? lol

Yep - and I was agreeing with you :y

and I agree with you again - sounds like the (hand) brake is binding.  The handbrake cable has a tendency to wear through its outer sheath just forward of the rear wheel arch - could be this sticking and causing the clonk as the shoes unbind as you move off...
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kentman99

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Re: Engine Misfiring & Cutting Out
« Reply #12 on: 28 April 2009, 16:55:24 »
Just had an update from the garage and there is good and bad news. First the good news, the misfire was caused by blocked breather pipes and easily fixed as Correctly called by mutant cav! And also nothing that serious is wrong with the brakes they just need freeing up. Unfortunately the good news ends there, the burning smell is being caused by a significant oil leaking around the exhaust but apparently not from the rocker cover. The garage receptionist felt that the cost of repair may outway the value of the car but will confirm hopefully tonight exactly what the damage is.  
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tmx

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Re: Engine Misfiring & Cutting Out
« Reply #13 on: 28 April 2009, 17:08:12 »
leaking on the exhaust sounds very much to me like rocker gaskets! thats why when you race an mv6 with duffed gaskets blue smoke appears from under the bonnet :y
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kentman99

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Re: Engine Misfiring & Cutting Out
« Reply #14 on: 28 April 2009, 17:50:45 »
Right this is getting confusing...........the apparent significant oil leak is actually a tiny leak that's not worth doing??? They cleaned up the area where the oil was and left the car running for 30 mins and no more oil leaked out. They think the leak was from a pipe which was running on to the exhaust and causing the burning smell. The misfire and brakes have been sorted all for £35! I think i'll get a second opinion on the oil leak just to be on the safe side.
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