popping noise from intake
Thread Starter
Junior Member
Joined: May 2006
Posts: 42
Likes: 0
From: Melbourne
Car: 89 Camaro RS
Engine: LM7
Transmission: T56
Axle/Gears: 3.42
popping noise from intake
i changed my plugs this weekend and now i've got a popping noise when i rev the motor or get on it hard when driving. timeing and firing order are correct. Anyone have any ideas? '89 camaro 350 tbi, 5spd.
Supreme Member
iTrader: (2)
Joined: Jan 2002
Posts: 9,962
Likes: 5
From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: popping noise from intake
Assuming no ignition issues and the timing is correct, it sounds like a lean issue. when the motor goes lean, itll pop out the intake. Does it still have the stock pump? Any mods?
Thread Starter
Junior Member
Joined: May 2006
Posts: 42
Likes: 0
From: Melbourne
Car: 89 Camaro RS
Engine: LM7
Transmission: T56
Axle/Gears: 3.42
Re: popping noise from intake
still have the stock pump, filter changed a few months ago. only mods are a chip and exhuast. whats a good way to check to see if its lean?
Supreme Member
iTrader: (2)
Joined: Jan 2002
Posts: 9,962
Likes: 5
From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: popping noise from intake
Easiest thing may be to check the fuel pressure and make sure it still delivers around 12 PSI. If its unsteady or the pressure drops when the motor is under load, then its time for a new pump.
Thread Starter
Junior Member
Joined: May 2006
Posts: 42
Likes: 0
From: Melbourne
Car: 89 Camaro RS
Engine: LM7
Transmission: T56
Axle/Gears: 3.42
Re: popping noise from intake
changed my plugs out again. all of them were clean except #7 which was black. bad cam lobe or bent push rod maybe? about to chk. my fuel pressure, just need to figure out how to hook up the gauge.
Member
Joined: Jun 2009
Posts: 129
Likes: 5
From: PA
Car: 1992 Jeep Wrangler + a few more car
Engine: Gm 5.7 T.B.I with 1227747 ECM
Transmission: 700r4 DIY built
Axle/Gears: Ford 8.8/D30- 4:10 and lockers
Re: popping noise from intake
This same thing happened to me tonite. I changed plugs and wires (for really good ones) and under wot its popping out the intake.. intresting
90 350 TBI
90 350 TBI
Supreme Member
Joined: Jul 2006
Posts: 1,674
Likes: 3
From: Windsor Ontario
Car: 1987 Firebird Formula
Engine: 2004 LQ4
Transmission: T-5 WC
Axle/Gears: 3.42
Re: popping noise from intake
Also, test your wires, use a multimeter and check the resistance from end to end. Post your results.
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