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Old 09-30-2004, 23:33   #1 (permalink)
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Backfiring at idle

Boys and girls riddle me this.
I've just fired the clevo after it being out of the ute for a couple of months due to a respray. When I start it it starts easily and runs normally except that there is an intermittant backfire approximately every 10 seconds from the right hand exhaust. It is similar to the effect you get if you coast down a hill with the ignition off and then turn it on except not as violent.
Timing is unchanged from when the engine was removed and the only thing I did to the engine while I had it out was to replace the sump gasket and remove the valve springs and replace the valve stem oil seals. (which I did using a piece of nylon rope fed in through each spark plug hole to hold the valves in place).
It is possible the exhaust pipe isnt properly seated in the manifold which might be letting in some air although it should be OK.
Does anyone have any other ideas?
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Old 10-01-2004, 01:03   #2 (permalink)
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Re: Backfiring at idle

Id be looking more at the carby, as it may be flooding at idle slightly,
Other possibilities could be ignition - plugs / leads etc...
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Old 10-01-2004, 06:36   #3 (permalink)
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Re: Backfiring at idle

sounds like a electrical miss or timing but if you haven't changed that check all the leads coil dissy etc.
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Old 10-01-2004, 17:44   #4 (permalink)
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Re: Backfiring at idle

Make sure no moiture got into the cap whilst it was sitting around.
Also sounds like an exhaust valve not closing properly at times.
Is it laways the same cylinder backfiring?
If it was the carb it would probably do it on both banks.
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Old 10-01-2004, 18:11   #5 (permalink)
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Re: Backfiring at idle

Same thing happened to me in my old ute. Turned out to be a gummed up exhaust valve. Motor wasn't started for 6 months. To fix mine I took off rocker cover and sprayed each valve stem with carby cleaner. Let it sit for a few minutes and then turned motor over by hand. Sprayed them again and let it sit for a couple of hours before starting it up. Problem fixed. Clevo's have a habit of gumming up valve guides when sitting for a while, so I have been told.
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Old 10-01-2004, 22:10   #6 (permalink)
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Re: Backfiring at idle

Dickhead error.........
The plug leads for 1 & 2 were swapped around, just goes to show, check the obvious before making a problem more difficult than it needs to be.
Thanks for your replies.
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Old 10-04-2004, 02:44   #7 (permalink)
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Re: Backfiring at idle

I was just about to say the leads are at fault or "haywired" , or maybe a cracked spark plug porcellan insulator. Anyway good work
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