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Author Topic: strange 3.2 misfire  (Read 247 times)

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swordfish

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strange 3.2 misfire
« on: 09 July 2018, 11:59:30 »

Hello,,
i have a strange misfire on the 3.2 . it only starts to do it if you give it some boot ,, [ above 3500rpm ] then it starts to misfire ?? . if you stop and switch off the engine and then restart it again  its clear again and runs on all 6 cylinders .until you go above 3500rmp and then it starts to misfire again ,,. if you drive around all day below 3000 rpm it stays on 6 cylinders no problem .  i have fitted the usual suspects . 6 new gm spark plugs and 2 brand new coil  packs  but it still performs the as above . ??? ???
any help would be appreciated
Thankyou
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Doctor Gollum

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Re: strange 3.2 misfire
« Reply #1 on: 09 July 2018, 12:04:35 »

Wiring loom fault or failing fuel pump. In no particular order.
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swordfish

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Re: strange 3.2 misfire
« Reply #2 on: 09 July 2018, 12:11:40 »

ok thanks,, still not found were that little oval one wire plug goes to
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Doctor Gollum

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Re: strange 3.2 misfire
« Reply #3 on: 09 July 2018, 12:14:57 »

Look harder.
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Kevin Wood

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Re: strange 3.2 misfire
« Reply #4 on: 09 July 2018, 12:36:15 »

If it's shutting down cylinders there will be codes stored.

I would read them using the pedal trick and take it from there.

My thoughts are a weak coil pack / plug that's causing a cylinder to miss under load, and then it gets disabled to save the cat.
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cam.in.head

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Re: strange 3.2 misfire
« Reply #5 on: 09 July 2018, 12:41:01 »

Has the fuel filter been changed anytime
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terry paget

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Re: strange 3.2 misfire
« Reply #6 on: 09 July 2018, 12:50:52 »

Sounds like inadequate fuel supply. Probably kinked fuel pipe, could be blocked filter or tired pump. Easily checked, it should deliver a pint a minute, disconnect the fuel feed line at the engine end and pump fuel into a bottle.

I have bought used Omegas which failed in this way following botched fuel filter changes.
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JamesV6CDX

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Re: strange 3.2 misfire
« Reply #7 on: 09 July 2018, 12:55:52 »

Need the codes before doing anything :y
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Newcastle Ant

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Re: strange 3.2 misfire
« Reply #8 on: 09 July 2018, 13:07:11 »

could be filter.......had exactly the same on a vectra = fuel filter blocked/blocking and won't let enough fuel flow when asked for at higher rpm's
 
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Doctor Gollum

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Re: strange 3.2 misfire
« Reply #9 on: 09 July 2018, 13:08:32 »

Need the codes before doing anything :y
True, and you know exactly what the next question will be  ::)

030x codes only paint a partial picture though... They confirm what is happening but not why. With new plugs and coils, there's only wiring and fuel left.

New loom was ultimately what fixed mine.
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zirk

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Re: strange 3.2 misfire
« Reply #10 on: 09 July 2018, 17:18:17 »

If its Electrical it should throw a Fault Code and probably stay miss firing untill a Code Reset or Ing. on / off.

If Fuel, may not throw any Codes.
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Kevin Wood

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Re: strange 3.2 misfire
« Reply #11 on: 10 July 2018, 00:22:18 »

The fact that once it starts misfiring it only stops when you restart it means the ECU is shutting down a pot, which means there'll be an 030x code, and possibly more if it's injector or ignition wiring or a knock sensor.
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swordfish

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Re: strange 3.2 misfire
« Reply #12 on: 11 July 2018, 22:17:02 »

If its Electrical it should throw a Fault Code and probably stay miss firing untill a Code Reset or Ing. on / off.

If Fuel, may not throw any Codes.
that's exactly what it does if you turn the ing off then back on it clears
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