engine run-on

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Nov 16, 2011 | 10:41 PM

MR-Q

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From: queensland

engine run-on

anyone had problems with engine run-on. i'm having problems with run-on after engine is turned off and a bad smell after this occurs,from excess fuel burning i would think. the timing seems to be right and it seems to only happen after it gets hot. is there any solution. I'm not to mechanical minded but willing to have a go. sorry its a 351 cleveland with new holley carb, but was doing it with old thermoquad.

Nov 16, 2011 | 11:04 PM

dohc_chump

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Joined: Apr 2009

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From: In the garage

my jeep diesels from time to time... leaky carb letting fuel into the combustion chamber is my culprit.

Nov 17, 2011 | 09:27 AM

Rogue_Wulff

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From: Lost

Idle speed too high is a common cause of this.

Nov 17, 2011 | 02:49 PM

Greyf100

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What's the timing set at?
What is your Idle speed (in neutral w/manual trans, P w/auto trans)

Did you set timing with a light, vacuum gauge, or by ear?

Is it hard to start? while hot? while cold?

How is your vacuum advance hooked up, if at all?

Nov 17, 2011 | 03:19 PM

Franklin2

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From: Virginia

I agree also, you idle speed is set too high.

Nov 17, 2011 | 04:54 PM

MR-Q

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From: queensland

thanks for replies, i set the timing to 6 degrees before top dead centre with auto in neutral with vacum line to elect dizzy off carb with a timing light. i think idle speed sits around 750 but it fluctuates on this. it it hard to start when hot only sometimes which i think is starter motor problem as i can tap the starter and she fires. just have to invest in new one. i will have a look at idle speed when i get a chance. does the vacum unit on the dizzy need replacing. i have just bought a new manifold for it so i will pull all this gear out soon. migh buy a new dizzy and coil while i am at it.

Nov 17, 2011 | 06:52 PM

Greyf100

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idle speed while in D holding the brake should be around 550rpm. Which should put it right about where you have it now in N.

Is the vacuum advanced hooked to Full manifold vacuum or Ported Vacuum?

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Nov 18, 2011 | 09:34 AM

Gary Lewis

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Joined: Jul 2010

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From: Northeast, OK

As I think greyf100 is implying, your vacuum should be hooked to ported vacuum. IOW, it should only get vacuum when you open the throttle but not at idle.