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2013 Chevrolet Suburban
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96 Suburban engine troubles

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Old March 22nd, 2011, 12:27 PM
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Default 96 Suburban engine troubles
What would cause the engine to make a thumping sound (usually 1-3 times) after failing to start with the key off?

In other words, try to start truck, it cranks but does not start

Turn key back to off position and the engine makes a thud or thump sound almost like it is turning over slowly a few times after key is off.

Thanks!
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Old March 22nd, 2011, 8:27 PM
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Welcome to the forum.

Maybe ignition timing is too advanced. Just a guess.
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Old March 22nd, 2011, 10:31 PM
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Bad starter?
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Old March 22nd, 2011, 11:09 PM
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Is it something like a piston in a compression stroke not making it and getting pushed back? Sounds kinda like horse snorting?
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Old March 22nd, 2011, 11:32 PM
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Originally Posted by EinST
Is it something like a piston in a compression stroke not making it and getting pushed back? Sounds kinda like horse snorting?
That is exactly what is sounds like. Seems like compression pushing a cylinder. What would cause this?
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Old March 22nd, 2011, 11:55 PM
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Too much timing advance.
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Old March 23rd, 2011, 2:30 AM
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Originally Posted by 73shark
Too much timing advance.
Alright, one more thing for the to do list. Thanks 73Shark and EinST.
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