Popping through the intake
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Old July 16th, 2008, 04:39 PM   #1
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Popping through the intake


What would cause this to happen? I crank the car up and back down the driveway (downhill) and then have to go up hill, give it some gas and it's ok come to a stop sign, stop and give it gas and get into the main road and stay in the gas and it sounds like it coming from the intake area. After it warms up it dosen't happen any more. Any suggestions, thanks for your help in advance.
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Old July 16th, 2008, 09:42 PM   #2
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Come on, I'm not new to the forum and nobody on this forum has any idea? That's hard to believe with all the people building bigger better new engines!!!
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Old July 17th, 2008, 04:24 PM   #3
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I really need you guys help, I know someone here has an answer.
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Old July 17th, 2008, 05:30 PM   #4
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the only popping i have ever seen related to the intake was from improper timing,. i believe too advanced but im not positive
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Old July 17th, 2008, 06:02 PM   #5
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Is it a popping noise like pop corn popping or what exactly does it sound like?

I think maybe folks aren't responding because they may not quite understand your problem??

<--- too dumb to offer a solution to your problem - I would have made an appt by now. Sorry!
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Old July 17th, 2008, 10:42 PM   #6
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I agree what doe it sound like?
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Old July 17th, 2008, 10:42 PM   #7
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Sorry does
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Old July 18th, 2008, 09:23 AM   #8
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i have been through this, after countless hours trying to isolate the electrical problem, i realized something must be fucked for it to backfire through the intake. something mechanically. Hopefully this isn't your problem, but pull the valve covers and make sure all the valves are opening and closeing, my cam was rounded right to a fine circle with no lobe left on here. this will cause the pressure to build and expell through your intake valve.
good luck
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Old July 18th, 2008, 02:57 PM   #9
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mine does the same exact thing, it sounds alot like its to lean, the second it warms up its ok, id also like some help on this one
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Old July 18th, 2008, 02:59 PM   #10
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Originally Posted by Hunt_chevs View Post
the only popping i have ever seen related to the intake was from improper timing,. i believe too advanced but im not positive
whats your timing at?
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Old July 18th, 2008, 04:12 PM   #11
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Originally Posted by chargedmustang View Post
I agree what doe it sound like?
It sounds almost like a back fire but I know it's coming from under the hood.
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Old July 18th, 2008, 04:13 PM   #12
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Originally Posted by Hunt_chevs View Post
whats your timing at?
Timing is set at 14* advanced.

By the way thanks for all you guys help.
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Old July 18th, 2008, 05:18 PM   #13
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Well I just took it out and it only makes on poping sound, and it may not be from the intake, but I know it's from under the hood area. No popcorn sounds, just a slight hesetation during acceleration from first to second gear and then one pop noise and that's it.
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Old July 18th, 2008, 07:50 PM   #14
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Originally Posted by hopper View Post
i have been through this, after countless hours trying to isolate the electrical problem, i realized something must be fucked for it to backfire through the intake. something mechanically. Hopefully this isn't your problem, but pull the valve covers and make sure all the valves are opening and closeing, my cam was rounded right to a fine circle with no lobe left on here. this will cause the pressure to build and expell through your intake valve.
good luck
he said it doesnt do it after it warms up.


mines has the same prob. my timing is also set at 14* but thats not it because i know on 93 octane it will take 15 or 16. if its the same prob im thinkin bout, the car kind of "bucks" and it starts doin it around like 1/4 throttle?
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Old July 20th, 2008, 01:03 PM   #15
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Originally Posted by GoodOleBoyzRacin View Post
he said it doesnt do it after it warms up.


mines has the same prob. my timing is also set at 14* but thats not it because i know on 93 octane it will take 15 or 16. if its the same prob im thinkin bout, the car kind of "bucks" and it starts doin it around like 1/4 throttle?
That sounds like my car!
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Old July 20th, 2008, 06:25 PM   #16
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The problem of the poping is most likely from from pre ignition.
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Old July 20th, 2008, 06:49 PM   #17
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had the same trouble. I switched to a gt 40 intake and forgot to hook up the air charge temp sensor. hooked it up and it worked.
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Old July 20th, 2008, 09:11 PM   #18
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i havent really worried about it cause im switching to carb soon, but i would get a meter and check the volts to all the sensors on top of the motor. but the backfiring out of the intake could be a rich condition.......and if its the air temp sensor it could be reading 0* temps and adding more fuel which would cause it to backfire, likely out of the intake, and also shity gas mileage
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Old July 24th, 2008, 02:18 AM   #19
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alright so i went into this a little more because i also wanted to figure it out, i couldnt understand why it only did it when first start up, its not something i really worried about, but i remember reading an artical on this very thing, this can accure on a high mileage engine, what happens is the upper and lower plenum build up a thin layer of carbon on the inside of the intake, so at first start up the carbon is almost kind of soaking up some of the fuel vapor, so there for your getting a lean mixture which causes that popping, i wasnt sure so i talked to a guy i work with and he said he has ran into this before. its nothing to worry about, and if your planning on changing over the intake it shouldnt matter
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