Car question (sorry!)

Dracan · Trackday Trickster Joined: 15 Apr 2005 Karma :

Sorry about this being a car question, not a bike question - but I guess an engine's an engine, and I know there's some people in here with good engine knowledge. Sometimes when I turn off the engine of my Nova, it stays running for about 4-5 seconds - slowly spluttering till it cuts out. Any ideas what this could be?

Cheers for any help,
Dan.
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feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

"dieseling" can be caused when the idle is set too high and/or the ignition is too far advanced. it lets fuel get sucked into the combustion chamber even tho it's off, and if the idle is lean/fast it can run hot enough to combust the fuel without a spark.

it's bad, so get your carb/idle and timing settings checked asap

a
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NBO · Two Stroke Sniffer Joined: 15 Sep 2005 Karma :

and if it was a diesel engine??

it would be petrolling Razz

feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

Dracan · Trackday Trickster Joined: 15 Apr 2005 Karma :

trafficdodger · Scooby Slapper Joined: 19 Jun 2005 Karma :

sounds like it is running rich to me

Finglonga · World Chat Champion Joined: 27 Jul 2004 Karma :

Could be Carbon build up on the head, stays glowing hot after you turn the ignition off. That would be hot enough to ignite any fuel still floating around.

When you drive the car do you open it up or just potter around town? It might need a good blowout to clear all the crap out. More fun is to Redex the bugger, air filter off and pour some s l o w l y into the carb while reving the engine, then just watch all the smoke come from the exhaust...Smells nice too. Shocked

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Dracan · Trackday Trickster Joined: 15 Apr 2005 Karma :

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sickpup · Old Timer Joined: 21 Apr 2004 Karma :

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

Nova fitted with a choke? check the cable is properly adjusted and
isn't holding the choke on, sure sign this is a problem if you can start the car without the choke. Or (dare I say it) make sure you're pushing the choke in absolutely as soon as possible.

If you want to hear dieseling in action - pull the choke right out as you turn off the ignition.

fin.