LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Loud pop then fuel fire?

Old Nov 19, 2013 | 06:40 PM
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Loud pop then fuel fire?

So I was just backing out of my driveway to get gas after a trip to the dmv. I heard a loud pop and tons of smoke was pouring out, popped the hood and there was a small fire. Where this happened I saw pieces of black plastic shattered and what looks like half of a black plastic clamp. Before this I could smell raw gas badly. I figured it was the egr. The engine still has power so I'm wondering what could have caused that. No major damage was done just some burnt plastics. The fuel line was burnt to a crisp and disconnected. Any information you need please let me know I would like to figure this out. Still in shock haha.

Last edited by 96zee; Nov 19, 2013 at 06:42 PM.
Old Nov 19, 2013 | 07:05 PM
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Re: Loud pop then fuel fire?

Found a green connector end on the passenger side in pieces, don't know what it's for.
Old Nov 19, 2013 | 07:23 PM
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Re: Loud pop then fuel fire?

After some more digging I found my egr valve is not bad, the mechanic did not plug it back in and I believe he capped off the vacuum connection. Could someone post a picture of the egr valve connections I cannot see diagrams clearly online.
Old Nov 19, 2013 | 09:57 PM
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Re: Loud pop then fuel fire?

http://shbox.com/1/egr1.jpg

Nothing to do with EGR should cause a fire or gas smell. It's all exhaust gases.
Old Nov 20, 2013 | 08:34 AM
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Re: Loud pop then fuel fire?

The green plug on the passenger side is likely the connector for the MAP sensor. I suspect you had a fuel accumulation in the intake manifold (leaking fuel pressure regulator??) and it exploded, and blew the black plastic MAP sensor out of the manifold.

Not sure what we would do without Shoebox's photos:

http://shbox.com/1/harness1.jpg

http://shbox.com/1/map.jpg
Old Nov 20, 2013 | 07:03 PM
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Re: Loud pop then fuel fire?

Originally Posted by Injuneer
The green plug on the passenger side is likely the connector for the MAP sensor. I suspect you had a fuel accumulation in the intake manifold (leaking fuel pressure regulator??) and it exploded, and blew the black plastic MAP sensor out of the manifold.

Not sure what we would do without Shoebox's photos:

http://shbox.com/1/harness1.jpg

http://shbox.com/1/map.jpg
Thanks injuneer i appreciate all of your help on my other threads. That seems to be what happened! I was messing with the fuel pressure regulator the other day, thinking it was the egr...duh. This mess has taught me a lot about my car though. Found my exhaust leak to! Thanks to the 5lb bag of baking soda I dumped on the fire lol. Now to take on the egr issue! Need to find pictures of all the components and plugins for it.
Old Nov 20, 2013 | 08:43 PM
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Re: Loud pop then fuel fire?

With that much energy dissipated you need to check everything attached to the intake, including parts connected by hoses. MAF, throttle blades, Opti vent line fittings, vacuum lines, etc. I've had a nitrous pop bend the throttles blades to a 90° angle. And it didn't blow the MAP sensor off.
Old Nov 20, 2013 | 08:55 PM
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Re: Loud pop then fuel fire?

Originally Posted by Injuneer
With that much energy dissipated you need to check everything attached to the intake, including parts connected by hoses. MAF, throttle blades, Opti vent line fittings, vacuum lines, etc. I've had a nitrous pop bend the throttles blades to a 90%u00B0 angle. And it didn't blow the MAP sensor off.
Ok I will definitely do that tomorrow after work! Thanks again!

Ps: I think it's ironic how i said I was going to set it on fire not to long ago... And sure enough. Had I been on the road it would be a crispy camaro.

Last edited by 96zee; Nov 20, 2013 at 08:57 PM.
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