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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 04-24-2007, 11:58 PM   #1
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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.
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Old 04-25-2007, 01:06 PM   #2
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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?
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Old 04-25-2007, 06:23 PM   #3
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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?
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Old 04-25-2007, 07:41 PM   #4
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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.
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Old 04-27-2007, 06:32 PM   #5
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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.
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Old 03-06-2010, 12:13 AM   #6
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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
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Old 03-08-2010, 04:21 PM   #7
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Re: popping noise from intake
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Originally Posted by JeepYJv8 View Post
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
Define 'Really good ones' My car won't run worth crap with NGK, Champion, or anything fancy. Stock plugs only, weird, I know..

Also, test your wires, use a multimeter and check the resistance from end to end. Post your results.
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Old 03-08-2010, 04:21 PM
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