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Author Topic: 3.2 Ecu Possible Fail?  (Read 4441 times)

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Duke01

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3.2 Ecu Possible Fail?
« on: 12 August 2015, 19:48:13 »
Hi Guys,

Car keeps misfiring, has new coil packs and plugs, so have been advised by the Garage to send the Ecu off for testing. They said they have checked out the wiring. Compression is fine.
Having read a few posts, i understand the Ecu failing is extremely rare?
I am happy to do this but wanted it done asap...

Any advice please?
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RobG

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Re: 3.2 Ecu Possible Fail?
« Reply #1 on: 12 August 2015, 19:52:41 »
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Duke01

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Re: 3.2 Ecu Possible Fail?
« Reply #2 on: 12 August 2015, 19:55:31 »
0300, 0301,0303,0305
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RobG

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Re: 3.2 Ecu Possible Fail?
« Reply #3 on: 12 August 2015, 19:58:39 »
1,3,5 coil pack seated correct, and was it a genuine Bosch
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Duke01

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Re: 3.2 Ecu Possible Fail?
« Reply #4 on: 12 August 2015, 20:00:19 »
Yep, its seated correctly. It is Genuine Bosch, I got one, then sent it back and tried a second one. Same problem.
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05omegav6

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Re: 3.2 Ecu Possible Fail?
« Reply #5 on: 12 August 2015, 20:14:57 »
Loom is toast... gets rather baked over the back of the engine... :-\
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Re: 3.2 Ecu Possible Fail?
« Reply #6 on: 12 August 2015, 20:58:29 »
That engine ecu is so reliable, failures are unheard of.
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Duke01

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Re: 3.2 Ecu Possible Fail?
« Reply #7 on: 12 August 2015, 21:19:11 »
Thanks guys. Will try and find a loom.
Forgot to add that when it runs rough in traffic, it can often be cured for a few minutes by switching off and on again...
On a run though its fine. Always happens in traffic...
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05omegav6

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Re: 3.2 Ecu Possible Fail?
« Reply #8 on: 13 August 2015, 10:29:25 »
Quote from: Duke01 on 12 August 2015, 21:19:11
Thanks guys. Will try and find a loom.
Forgot to add that when it runs rough in traffic, it can often be cured for a few minutes by switching off and on again...
On a run though its fine. Always happens in traffic...
Off and on works temporarily because the ecu resets at initial switch on and takes a few minutes to find its levels...

New loom is the only reliable cure, were available from GM...
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Re: 3.2 Ecu Possible Fail?
« Reply #9 on: 13 August 2015, 10:55:02 »
Op's profile shows his vehicle is also lpg'd (forklift fuel) could that be causing a misfire.
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Andy H

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Re: 3.2 Ecu Possible Fail?
« Reply #10 on: 13 August 2015, 11:00:42 »
Quote from: Harris K Telemacher on 13 August 2015, 10:29:25
Quote from: Duke01 on 12 August 2015, 21:19:11
Thanks guys. Will try and find a loom.
Forgot to add that when it runs rough in traffic, it can often be cured for a few minutes by switching off and on again...
On a run though its fine. Always happens in traffic...
Off and on works temporarily because the ecu resets at initial switch on and takes a few minutes to find its levels...

New loom is the only reliable cure, were available from GM...
If the ECU is in limp mode then switching off and restarting will clear the limp mode.

I thought the ECUs were capable of detecting a persistant misfire and cutting the fuel to the offending cylinder(s) to prevent flooding and damage to the cats.
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Re: 3.2 Ecu Possible Fail?
« Reply #11 on: 13 August 2015, 12:17:35 »
The ecu does indeed detect a misfire and shut the cylinder down (including fuel injection) to protect the cat, oil and cylinders. On start up, it will run on a default map plus correction values until it enters closed loop.

Hence a re-start will cure said misfire.

I personally am uncomfortable that good diag has been done thus far on this issue, adding parts in just adds unknowns, I would want to see a proper test of the coil pack (with test plug), inspection of plugs and a compression test (although given the fact it can run ok I don't suspect there is an issue here).

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Andy H

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Re: 3.2 Ecu Possible Fail?
« Reply #12 on: 13 August 2015, 14:24:04 »
Quote from: biggriffin on 13 August 2015, 10:55:02
Op's profile shows his vehicle is also lpg'd (forklift fuel) could that be causing a misfire.
Yes it could.

The LPG ECU interrupts the feeds to the petrol injectors - poor wiring or a faulty LPG ECU could cause a misfire on petrol as well as LPG.

LPG causes faster spark plug erosion and it needs a better spark than petrol so new plugs may be required.
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Re: 3.2 Ecu Possible Fail?
« Reply #13 on: 14 August 2015, 11:33:35 »
Quote from: Andy H on 13 August 2015, 14:24:04
Quote from: biggriffin on 13 August 2015, 10:55:02
Op's profile shows his vehicle is also lpg'd (forklift fuel) could that be causing a misfire.
Yes it could.

The LPG ECU interrupts the feeds to the petrol injectors - poor wiring or a faulty LPG ECU could cause a misfire on petrol as well as LPG.

LPG causes faster spark plug erosion and it needs a better spark than petrol so new plugs may be required.

Highly unlikely to be the ECU, it defaults to petrol. Wiring is a strong culprit though, especially with all the other stuff behind there
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Duke01

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Re: 3.2 Ecu Possible Fail?
« Reply #14 on: 14 August 2015, 21:00:45 »
Thanks Guys, am going to try another engine loom first.
I guess Vauxhall dont keep these now? or if they do it will be a fortune.
I see there are a few on ebay :(

In any case i imagine its a major pain in the arse to get at.
Not looking forward to this...
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Re: 3.2 Ecu Possible Fail?
« Reply #15 on: 14 August 2015, 23:02:52 »
Hi had similar problems on wifes 3.0 v6 on lpg and was corroded plugs on lpg ecu as I later discovered. A second ecu would be easier to try in than the wiring as its just plug in the ecu and immobiliser at ignition key if someone could loan you one for test purpose. Just a thought to save a lot of time and hassle. Cheers Eric
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omegapioneer

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Re: 3.2 Ecu Possible Fail?
« Reply #16 on: 14 August 2015, 23:08:02 »
Sorry forgot to add my onega 3.2 lpg was running bad lumpy fueltrim misfires etc tried coil packs plugs o2 sensorsetc turned out to be ruptured diaphragm in lpg vapouriser causing gas to enter were should have been getting madifold pressure.  And also lpg cars need correct spark pligs to suit install. Cheers Eric
« Last Edit: 14 August 2015, 23:11:21 by omegapioneer »
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Re: 3.2 Ecu Possible Fail?
« Reply #17 on: 15 August 2015, 00:16:33 »
Quote from: omegapioneer on 14 August 2015, 23:02:52
Hi had similar problems on wifes 3.0 v6 on lpg and was corroded plugs on lpg ecu as I later discovered. A second ecu would be easier to try in than the wiring as its just plug in the ecu and immobiliser at ignition key if someone could loan you one for test purpose. Just a thought to save a lot of time and hassle. Cheers Eric

The ECU's don't fail ;)

Quote from: omegapioneer on 14 August 2015, 23:08:02
Sorry forgot to add my onega 3.2 lpg was running bad lumpy fueltrim misfires etc tried coil packs plugs o2 sensorsetc turned out to be ruptured diaphragm in lpg vapouriser causing gas to enter were should have been getting madifold pressure.  And also lpg cars need correct spark pligs to suit install. Cheers Eric

LPG cars require the correct plugs. GM plugs are perfect... I've done 130k plus with no issues
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