3.2 V6 Multiple cylinder misfires - Alfa Romeo Forum
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(Post Link) post #1 of 14 Old 24-08-16 Thread Starter
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Unhappy 3.2 V6 Multiple cylinder misfires

I have a 3.2, 90k miles, threw a misfire cylinder 1 error (and it was noticeably misfiring). Took it in and had a coil replaced (I had one burn out last year), threw the same, Spark plug and injector have been replaced and it's cleared and now there is misfires on 2, 3 and 6 along with a physical, noticeable misfire.

Idle is smooth, misfire is on slightly harder acceleration. Misfire stops as you lift.

It's been a bit noisy for a year or two but not tractor-noisy.

Any experiences of similar or suggestions where to look next?
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Originally Posted by Simon156 View Post
I have a 3.2, 90k miles, threw a misfire cylinder 1 error (and it was noticeably misfiring). Took it in and had a coil replaced (I had one burn out last year), threw the same, Spark plug and injector have been replaced and it's cleared and now there is misfires on 2, 3 and 6 along with a physical, noticeable misfire.

Idle is smooth, misfire is on slightly harder acceleration. Misfire stops as you lift.

It's been a bit noisy for a year or two but not tractor-noisy.

Any experiences of similar or suggestions where to look next?
I would guess at injectors. Had a similar problem with my V6 . It was cured by Autolusso reconditioning/replacing injectors. Smooth as silk ever since.
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I have just bought an injector rebuild kit off of amazon for £15 (includes delivery). It contains 12x o rings and 6 microfilters. Get yourself a set and get that fitted and run a bottle of injector cleaner on a low tank. That should sort any injector issues unless they are physically failing.

Before spending any money though, give it a compression test.

Edit - Just saw this was for a 159 so a GM engine so the above may not be as helpfull. Being a direct injection engine the injectors are probably a bit different from the Busso 3.2
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The JTS injectors can be temperamental, my 2.0 JTS was very similar. I used a good injector cleaner (BG I recall), problems disappeared. Also worth noting, after I got it all working properly I never used Supermarket fuels, unless I had to, problem never reoccurred.
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(Post Link) post #5 of 14 Old 25-08-16 Thread Starter
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I would guess at injectors. Had a similar problem with my V6 . It was cured by Autolusso reconditioning/replacing injectors. Smooth as silk ever since.


Thanks. Did you have more than one go at a time? Injectors are a couple of hundred quid a shot so another three's quite lumpy especially if it doesn't cure it!

I'll talk to my garage about possibilities of checking this out.


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(Post Link) post #6 of 14 Old 25-08-16 Thread Starter
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The JTS injectors can be temperamental, my 2.0 JTS was very similar. I used a good injector cleaner (BG I recall), problems disappeared. Also worth noting, after I got it all working properly I never used Supermarket fuels, unless I had to, problem never reoccurred.

Appreciate the reply.

Last few fills were from a BP garage and I don't think I've ever used supermarket stuff. Last year I put some Redex in and had a coil burn out a month later. Not used an additive/cleaner since either.


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Just had a thought, have yu check the connections on the loom to the injectors, I know the 2.0 could be an issue.
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(Post Link) post #8 of 14 Old 26-08-16 Thread Starter
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Thanks again. The slightly confusing part is the issue is under acceleration not at idle. Dirty injectors, air flow, electrical connection I would expect to be constant rather than load based.


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Thanks again. The slightly confusing part is the issue is under acceleration not at idle. Dirty injectors, air flow, electrical connection I would expect to be constant rather than load based.


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Injectors are load based, sounds like injectors to me

In take manifold has to come of to get them out so a good idea to do spark plugs at the same time

There is a page about it on our web site

Autolusso - Injector Cleaning

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Try just giving it a good thrashing first with injector clean & 99Ron fuel. Keep it in 4th gear at around 80-100mph on the motorway, after quarter of a tank if it's still doing it then try the injector rebuild kit. Save money and have fun listening to the engine at those revs ?
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(Post Link) post #11 of 14 Old 26-08-16 Thread Starter
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3.2 V6 Multiple cylinder misfires

Quote:
Originally Posted by Autolusso View Post
Injectors are load based, sounds like injectors to me

In take manifold has to come of to get them out so a good idea to do spark plugs at the same time

There is a page about it on our web site

Autolusso - Injector Cleaning

Ned


And not unusual for four to alert in quick succession? Fuel contamination or similar?

Given the high cost of an Alfa supplied reconditioned unit it may be cost effective for me to pick it up from my specialists and take a day trip to sunny Bedfordshire or whip out all six and courier them up. Is this a turn around in day job?

Plugs were done a year and 10k miles ago.



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Last edited by Simon156; 26-08-16 at 12:53.
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And not unusual for four to alert in quick succession? Fuel contamination or similar? Sparks were done

Given the high cost of been an Alfa supplied reconditioned unit it may be cost effective for me to pick it up from my specialists and take a day trip to sunny Bedfordshire or whip out all six and send them up. Is this a turn around in day job?

Plugs were done a year and 10k miles ago.



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This may explain your issue, lots of places list the wrong plugs for this engine, the ones listed are shorter than they should be so the spark is in spark plug hole rather than in the cylinder

There is also a plastic breather pipe on the back of the plenum which splits, this needs to be checked

It is a lot cheaper for us to recondition the injectors than buy new ones

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What length should the plugs be? I can get them to check that.

Last edited by Simon156; 30-08-16 at 11:04.
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(Post Link) post #14 of 14 Old 06-09-16 Thread Starter
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Waiting to see what lugs were fitted. The original cylinder has had injector, plug and coil and still gives a misfire code. ☹️


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