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Discussion Starter · #1 ·
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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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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Discussion Starter · #5 ·
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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Discussion Starter · #6 ·
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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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

Ned
 

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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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Discussion Starter · #11 · (Edited)
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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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

Ned
 

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The original post is already old, but 3 weeks ago the following began to happen sporadically to me, all of a sudden this list of errors in diagnostics:
  • Cylinder 6 or 3 or both "injector Circuit High"
  • Cruise Control Multi - Function Input A Circuit
  • Random / Multiple Cylinder Misfire Detected
  • Cylinder 6 Misfire Detected
  • Cylinder 3 Misfire Detected
In addition, faults on the dashboard display, such as ASR error, Cruise and failure of the fuel gauge in the tank.
This only happened in counterclockwise (left) turns .
At the time of the failure, the engine was running as tractor erratically and this problem disappeared alone after 10-20 seconds or it was necessary to stop car and turn off the engine, then restart and the irregular operation lasted for about 10 seconds after starting and then it disappeared.
At first I was looking for a problem in the main + battery cables and ground but I didn't find anything.

Finally, with the engine good running at idle I try move the cable bundles around the engine until I found a place where, after a slight movement, the described fault occurred again.
The cause of the defect was the damage of insulation on the cable harness by the sharp edge of the cylinder head under the decorative engine plastic cover around at cylinder 3 (right side of the engine at the water cooler).
Whenever exposed cables with damaged insulation touched the edge of the cylinder head, the described faults occurred.
So I covered the damaged insulation with insulating tape and wrapped the whole bundle in a piece of garden hose and secured against unwanted hose displacement with the binding tapes and thus attached it to the holder.
The original plastic cable harness holder disintegrated and so the harness rubbed against the cylinder head ...
 

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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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Exactly! And why 1,2 & 6 specifically?

What is the connection between cylinder 1, 2 & 6?

Well, aside from the ECU base map - to get the engine running in the first place, any dynamic changes to fuel injection and ignition is predictive. I e, the following cylinders settings are determined by what went before.

So, firing order is 1 - 6. 1 is rear bank and its data is used to preset number 2 - front bank. And Number 6, front bank, is preset by 5 which in turn presets number 1 !!!!!!!

There is a bit more going on, but this is the fundamental to proper timing and thus smooth running.

But I would go along with any other cockamamie logic just to maintain the mystery of it all!

And, I would ignore my overwhelming feeling it may just be oil pressure/timing chain related!
 

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Why do I always pick up on old topics? Can’t blame the Ipad. Still, it’s relevant to the issue - time doesn't change that.
Wonder, how many 3.2 JTS’s remain on the road today? I’d like to think the guy still had his car, but more than likely sold now or scrapped.
 

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Why do I always pick up on old topics? Can’t blame the Ipad. Still, it’s relevant to the issue - time doesn't change that.
Wonder, how many 3.2 JTS’s remain on the road today? I’d like to think the guy still had his car, but more than likely sold now or scrapped.
Today most everything is scrapped.
Often little was enough for it to work again ...
I professional repairer of TVs, PCs , but often acquaintances and friends come up with engine diagnostics, especially petrol cars bought in a bazaar.
Many times it helps to drive with the memory oscilloscope connected and then monitor the records of the individual connected sensors as the fault manifests itself because it is difficult to find out which was is first (egg or hen) and according to the oscilloscope it is possible to trace at which input the anomaly appeared first and what is appear after on control unit reactions to this anomaly.
So I know that as IQ decreases and laziness rises, more things appear on recycling (Idiocracy) :)
 

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It's off topic, but in 2 weeks I will be mounting oil pressure sensor on this engine and placing a pressure gauge instead of a malfunctioning oil temperature gauge.
As an old school person, I know what it makes sense along with the quality of the oil I use ...
Since the temperature of the oil also decreases its viscosity and thus the lubricating ability and the oil pressure then decreases ...
 

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Today most everything is scrapped.
Often little was enough for it to work again ...
I professional repairer of TVs, PCs , but often acquaintances and friends come up with engine diagnostics, especially petrol cars bought in a bazaar.
Many times it helps to drive with the memory oscilloscope connected and then monitor the records of the individual connected sensors as the fault manifests itself because it is difficult to find out which was is first (egg or hen) and according to the oscilloscope it is possible to trace at which input the anomaly appeared first and what is appear after on control unit reactions to this anomaly.
So I know that as IQ decreases and laziness rises, more things appear on recycling (Idiocracy) :)
So true!

I still have a deep “V” scar on the palm of my left hand. I had clockwork a Hornby train which I overwound as six year old. So, I decided I could fix it.

Ten minutes later with the loco attached to my hand, flesh jammed between the mainspring cog and the output sprocket and blood going everywhere, mum and dad had to forcibly remove it. I can still see the coils swiftly unwinding as my flesh came free!

Not quite as dramatic as when the TV repair man told me not to touch, as he went to get a valve from the van - still puzzled as how I got to be behind the sofa and him shouting, “I told you not to touch”!

Years later, I couldn’t really complain when my son systematically took a Panasonic cassette radio apart, followed by a Sinclair Z80 and a BBC micro “B”.

I went on to be a High Power Broadcast Engineer and my son a Software Genius.

If things weren’t replaced with “The latest Model”, before they broke, although kids probably wouldn’t be able to fix it, curiosity would stimulate them to to try!

And curiosity leads to understanding. and before they know where they are, the maths and the physics start to fit.

Not too many kids put their hands up in my school - pride or perhaps shame at not understanding the problem. But the teachers were more attentive, quickly leaning over the pupil or sitting beside them to give guidance.

One of my teachers would quote “The Child is Father of the Man” - George “Stubbs(ie), Maths & Physics. Don’t know who he was quoting, but it is a fundamental truth!
 
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