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Author Topic: Bloomin' misfire  (Read 4719 times)

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Paulus

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Bloomin' misfire
« on: 03 January 2008, 12:48:16 »
This morning, I developed a misfire. It was fins for my initial 40 mile trip, then after standing for an hour, I started it up and it was missing. There was also a strong exhaust smell through the vents. Could a leaky exhaust cause a misfire? I also noticed that there was a tapping noise from the engine. Could this be unburnt fuel doing strange things?

I've had a look at HT leads and a general look round this lunch time, but I can't see anything amiss. It started ok, but after about 1/2 mile, the misfire came back.

I have recently put new sparkies in and done the cambelt, but I have done 500 miles since then.

Any ideas? I've only just put it back on the road after 3 months on the drive  :(.
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Nickbat

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Re: Bloomin' misfire
« Reply #1 on: 03 January 2008, 12:56:53 »
A few years ago, on my previous Omega, I changed the plugs and used Bosch replacements. Car acquired a misfire after a couple of weeks and when I found up a local mechanic his first question was "Did you use Bosch plugs? If so, take 'em out and use NGKs". I did and the problem went away.  :y
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Paulus

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Re: Bloomin' misfire
« Reply #2 on: 03 January 2008, 12:59:22 »
They are GM genuine parts.
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shyboy

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Re: Bloomin' misfire
« Reply #3 on: 03 January 2008, 13:11:26 »
In view of the tapping and smell would it not be wise to check the cambelt job. Did you replace pulleys and tensioner? Slipped tooth? Don't take any chances!
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Paulus

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Re: Bloomin' misfire
« Reply #4 on: 03 January 2008, 13:12:20 »
Quote
In view of the tapping and smell would it not be wise to check the cambelt job. Did you replace pulleys and tensioner? Slipped tooth? Don't take any chances!
That's what I was thinking... :(
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Admin

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Re: Bloomin' misfire
« Reply #5 on: 03 January 2008, 13:13:21 »
Check the obvious first.

Fault codes check? (could be first signs of crank sensor)

Are the plug leads seated correctly at both ends? Not soaked in oil?
Connectors seated fine?

Does it run completely fine when cold?

Have you recently changed the cam cover gaskets?
Leads that sit in oil will often start to fail soon after the gaskets are sorted. Check the resistance of the leads. Should be between 2k-10k ohm as I recall.

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Paulus

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Re: Bloomin' misfire
« Reply #6 on: 03 January 2008, 13:43:57 »
I have recently changed the cam cover gaskets...I have also fitted a new crank sensor at the same time. the sparkies that I can currently get at have no oil on them and everything seems tickity-boo.

The rest will have to wait till the weekend...back to the 306 TD >:(
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Marks DTM Calib

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Re: Bloomin' misfire
« Reply #7 on: 03 January 2008, 14:09:44 »
Spark plugs torqued down correctly?

One worked loose?
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Paulus

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Re: Bloomin' misfire
« Reply #8 on: 03 January 2008, 14:24:39 »
Could well be...as it didn't misfire when cold, I am hoping that it isn't the cambelt slipping.
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Paulus

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Re: Bloomin' misfire
« Reply #9 on: 03 January 2008, 17:14:34 »
I've just been thinking...when I say misfire, what I really mean to say is that one of the cylinders isn't firing whatsoever.
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Admin

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Re: Bloomin' misfire
« Reply #10 on: 03 January 2008, 17:27:46 »
The symptoms do not point to cambelt slipped, that will make the car feel wrong whether it is warm or cold.

Do check the spark plug torques (use a torque wrench, a stripped thread is not fun to sort as Mark will testify to!)

If not, it is plug leads first then DIS pack as it sounds ignition related.
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JamesV6CDX

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Re: Bloomin' misfire
« Reply #11 on: 03 January 2008, 17:30:21 »
Quote
The symptoms do not point to cambelt slipped, that will make the car feel wrong whether it is warm or cold.

Do check the spark plug torques (use a torque wrench, a stripped thread is not fun to sort as Mark will testify to!)

If not, it is plug leads first then DIS pack as it sounds ignition related.

I fully agree with Dave, but would also add that if you don't find a loose plug, it would be worth a quick compression test before spending out on leads / DIS
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ians

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Re: Bloomin' misfire
« Reply #12 on: 03 January 2008, 17:41:31 »
Check the leads are seated at the DIS end too - I found its very easy to dislodge them when refitting the cam cover.   If they are arcing that could be the noise you are hearing..

It could also be that the leads have dried out now and are starting to break down when hot.

I assume there is no engine management light on?
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Paulus

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Re: Bloomin' misfire
« Reply #13 on: 03 January 2008, 21:04:50 »
I've had a quick check tonight...I can't see any arking in the dark. I also checked the N/S bank of plugs as they are easily accessible. All tested ok with an inline spark tester.

At tickover, there is no misfire, but the slightest load, ie when in D, it misses.

I'll have to wait till the weekend to give it a thorough check now.  >:(

Thanks for the advice guys.  :y
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andyc

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Re: Bloomin' misfire
« Reply #14 on: 03 January 2008, 23:55:09 »
Quote
A few years ago, on my previous Omega, I changed the plugs and used Bosch replacements. Car acquired a misfire after a couple of weeks and when I found up a local mechanic his first question was "Did you use Bosch plugs? If so, take 'em out and use NGKs". I did and the problem went away.  :y

strange, OE plugs are bosch items, never had a problem with them but have had with NGK

Andy
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