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Author Topic: Mis-firing under load  (Read 1282 times)

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Robbo_cdx

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Mis-firing under load
« on: 15 September 2011, 23:42:37 »
Evening,

Last one for tonight, honest  :)

My car is missing under acceleration. It's ok when cruising at a steady speed but struggles to  accelerate. I thought it was possibly the plugs, when I changed them the plug recesses were full of oil.

I see from other threads this is not unheard of on the V6 and is the rocker box gasket. I'm guessing this is the same on the lowly 2.2?

Would this oil cause a misfire? I can't honestly sav I know if oil conducts electricity  :-/

Cheers

Robbo
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albitz

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Re: Mis-firing under load
« Reply #1 on: 15 September 2011, 23:43:51 »
Coilpack fried probably. ;)
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The Red Baron

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Re: Mis-firing under load
« Reply #2 on: 15 September 2011, 23:44:30 »
yes, oil in the wells will cause a missfire, it will bugger the leads & eventually the diss pack. new gaskets required.  :y
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ndmv6

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Re: Mis-firing under load
« Reply #3 on: 15 September 2011, 23:45:51 »
hot oil fries the rubber sleeves and  coil pack,then cause poor starting and slight misfire under load..feels held back ?
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Robbo_cdx

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Re: Mis-firing under load
« Reply #4 on: 15 September 2011, 23:55:52 »
Quote
hot oil fries the rubber sleeves and  coil pack,then cause poor starting and slight misfire under load..feels held back ?

Thats absolutely it, almost feels like the hand brake is on.
New gasket at the weekend then and hope the coil packs are ok.

Thanks all  :)
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The Red Baron

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Re: Mis-firing under load
« Reply #5 on: 15 September 2011, 23:57:37 »
clean all the oil from the wells too. dont know if it needs breathers cleaning out also. not too good with the 4 pots.
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ndmv6

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Re: Mis-firing under load
« Reply #6 on: 16 September 2011, 00:03:57 »
may be worth buying a small plastic syringe with a short length of pipe attached to try and get most of the oil out before you take the plugs out to clean them..oil dropping into the pots really upsets the lambda sensors and that can lead to no end of trouble and cost, once the engine is fired up again..
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Vamps

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Re: Mis-firing under load
« Reply #7 on: 16 September 2011, 00:11:10 »
Coil pack change is a 5 minute job..... :y
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I_want_an_Omega

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Re: Mis-firing under load
« Reply #8 on: 18 September 2011, 17:02:20 »
Quote
Coil pack change is a 5 minute job..... :y

On the V6 the only aspect of this to take 5 mins is the application of sticking plasters afterwards   :-[
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Robbo_cdx

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Re: Mis-firing under load
« Reply #9 on: 19 September 2011, 23:07:11 »
Well in between getting pissed on ( I really hate this countries weather  >:( ) I replaced the cam cover gasket and o rings. It was obvious that the cover had been off before by the 2 pounds of gobbo all over the shop. What a mess!! ::)

Cleaned all the plug wells and coil pack. Put it all back together and.... Bingo!! No more missing, starts better too. Still a bit fluffy (technical term that) when cold but miles better.

However, it still feels a bit flat. Is it still possible that there could be an issue with the coil pack or is my right foot just not heavy enough?

Thanks

Robbo.
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RobG

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Re: Mis-firing under load
« Reply #10 on: 19 September 2011, 23:10:07 »
Quote
Well in between getting pissed on ( I really hate this countries weather  >:( ) I replaced the cam cover gasket and o rings. It was obvious that the cover had been off before by the 2 pounds of gobbo all over the shop. What a mess!! ::)

Cleaned all the plug wells and coil pack. Put it all back together and.... Bingo!! No more missing, starts better too. Still a bit fluffy (technical term that) when cold but miles better.

However, it still feels a bit flat. Is it still possible that there could be an issue with the coil pack or is my right foot just not heavy enough?

Thanks

Robbo.
After all that did you clean the breathers and throttle body :question
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Robbo_cdx

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Re: Mis-firing under load
« Reply #11 on: 19 September 2011, 23:25:59 »
Quote
Quote
Well in between getting pissed on ( I really hate this countries weather  >:( ) I replaced the cam cover gasket and o rings. It was obvious that the cover had been off before by the 2 pounds of gobbo all over the shop. What a mess!! ::)

Cleaned all the plug wells and coil pack. Put it all back together and.... Bingo!! No more missing, starts better too. Still a bit fluffy (technical term that) when cold but miles better.

However, it still feels a bit flat. Is it still possible that there could be an issue with the coil pack or is my right foot just not heavy enough?

Thanks

Robbo.
After all that did you clean the breathers and throttle body :question

Throttle body? Nobody said anything about a throttle body?  :'(

Checked the breather pipes were clear though  :)

I'm guessing it's out with the spanners again this weekend then.  :)
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RobG

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Re: Mis-firing under load
« Reply #12 on: 19 September 2011, 23:26:43 »
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Robbo_cdx

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Re: Mis-firing under load
« Reply #13 on: 19 September 2011, 23:29:19 »
Excellent, thanks for that  :)

As a matter of interest, what is the frequency for this job?
Every 10K,20K or just as needed?

Thanks.
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