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Old 04-25-2012, 01:26 PM   #1
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Ignition timing

I have a 1990 Chevy 454 and while have found the way to check the timing, I have not found the spec.. This is Winnebago Chieftan RQ 33. The reason I'm asking is because when I shut the engine off it keeps on running. Thank you so much in advance for your help. Any other suggestions would be greatly appreciated.

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Old 04-25-2012, 01:36 PM   #2
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how do set the timing on a 1990 454 chevy hei engine - JustAnswer

Just to be clear it's 4deg before top dead center

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Old 04-25-2012, 01:42 PM   #3
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Being a 1990 the timing may be computer controlled and non-adjustable. The way I check is to pop off the distributor cap and see if the rotor will move without the engine moving. If it will move a couple of degrees you don't have computer controlled timing.

I can't help with the factory spec but with this being a 21 year old engine the factory spec may not be the best to go by. I hook up a vacuum gauge and time it to where I get the best steady vacuum. If I hear pinging on the test drive I back it down a degree or two.

Is it fuel injected or carbureted? Dieseling (run on) could be any number of things but my understanding of the root cause is that you've got enough heat somewhere in the engine/heads/exhaust/plugs to ignite the fuel in the absence of spark. With a carburetor that doesn't have a fuel shutoff solenoid it will deliver fuel as long as the engine is spinning.

I would also suspect it may be a too-lean mixture which could be caused by a number of things. An engine that runs too lean will have high cylinder and exhaust temps.
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Old 04-25-2012, 02:00 PM   #4
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The answer is 4 degrees
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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Old 04-26-2012, 12:23 AM   #5
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If it is carburated check the throttle shaft for wear. This is the shaft that runs thru the front venturies. Mine was worn and the throttle would hang to far open and would diesel when the key was turned off. New bushings were installed in the carb when I had it rebuilt.
Before my carb was fixed I would shut the key off before putting the transmission in Park. This eleminated the dieseling most of the time.
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Old 04-26-2012, 07:04 AM   #6
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The timing

Thank you all for your help.
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Old 04-26-2012, 06:11 PM   #7
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Just to be clear, is your Winnie a 1990 or a 1991? Generally the chassis on an RV is from the year previous to the year of the RV build, so if you have a 1990 Winnie, you have a 1989 454 engine.

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