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Discussion Starter · #1 ·
Has anyone experienced intake backfire explosion that actually blew out front of intake if so did you find out the cause?
 

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Greg
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Give some more information, year and mods.
 

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Did you spray anything into the throttle body like carb cleaner or starter fluid (ether)?
 

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Greg
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My guess is a intake valve stuck open and when the cylinder fired it blew into the manifold. I had a back fire on start up a long time ago after the truck sat at the airport for three weeks. And again on the way out of the parking lot. Didn't break the manifold, but I think it was a close call.

In your case I would do a compression check before firing the next time.
 

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Discussion Starter · #10 ·
Pulled heads had them redone no bad valves or springs did compression check before I pulled them good compression on all cylinders waiting on new intake I'll put back together and hope it doesn't do it again
 

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Greg
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With new valve springs and valve job you should be good.
 

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That's a weird one for sure. Go a step further for good measure and replace the purge valve on the truck near the lower battery area. They have been known to sometimes stick open and on a refill of fuel get fuel in the line and sick that into the intake essentially making an injection bomb possibly. Changing that and having the heads done pretty much covers any possible issue
 

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Discussion Starter · #14 ·
Thank you for that info that's about most reasonable explanation I have heard since I have checked everything thing else I can think of
 

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I remember seeing a pic of the carnage when a manifold got blown up from using to much seafoam. I'm sure this is not the case!!!
 

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Greg
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