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Avalon, Mustang, Val
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Discussion Starter #1
Hey 4runner folks!!! I have a 93 4runner with the 3.0 V6 and it has 173k miles on it. It was running fine until yesterday.
Driving back to work after lunch at normal traffic speed of 45mph, I heard this loud pop like a back fire. Then it starts making a loud noise under the hood, sort of like when the exhaust manifold or something breaks open. Also there is a strong odor of fuel under the hood like the exhaust isnt getting released correctly.
I have a video of the niose, but I can't determine what it is. Hopefully it isnt something serious. There is no check engine light and it didn't overheat.
Any Ideas what can cause this or be the culprit?
Thanks.
 

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Registered
Avalon, Mustang, Val
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10 Posts
Discussion Starter #2
Loud noise under hood after a back fire

We were able to track down what the issue was. no one replied back on this post. Which was rather disappointing to me.
Come to find out what happened was a spark plug on the motor had backed out because the previous owner didn't tighten the plug all the way as it should have been.
And we also found a large vacuum leak on the back side of the motor. Which we fixed as well.

So to anyone that hears a large pop and then the motor is loud, check your plugs to make sure one of them didn't blow out of the plug hole.
 
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