Popping noise under full acceleration - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 22nd, 01, 08:10 PM Thread Starter
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Ok I have a 1968 Camaro with a 350/350 combo. A few days ago, I noticed a large loss of power in the form of I could not even get my tires to break loose when giving the car full gas. I had recently put on a new intake manifold and thought it had a vacuum leak, which it did, but I fixed it. Now I still have no power off idle and when I reach around 4-5g I have this strange rapid popping, backfiring, sound that seems to be coming from around the transmission area. I was thinking that it could possible be the torque converter because if that was going, it could explain my power loss? I'm really at a loss here.. can anyone please help?



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post #2 of 8 (permalink) Old Mar 23rd, 01, 02:14 AM
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popping usually is a timing issue, check your timing, you mention you replaced the intake, which means you pulled the distributer, I had a similar issue where when I replaced the distributer I was off by about 1 wire, so it was close, but major loss in power, I pulled all the wires, remarked the cap and re installed the distributer, checking the timing, and it works great.
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post #3 of 8 (permalink) Old Mar 23rd, 01, 06:10 AM
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i recently had the same problem a large popping at high rpms. Mine was due to worndown lobes on my camshaft. How is your cam? If the cam is good and the timing and firing order or good then go ahead and check the converter.

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post #4 of 8 (permalink) Old Mar 23rd, 01, 07:09 AM
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I would check cam and valve springs. You might have a broken exhaust spring near the end of the spring and it's floating the valve.

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post #5 of 8 (permalink) Old Mar 23rd, 01, 09:08 AM
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I think if you hook up a vacuum gauge and rev the motor up and down slowly and see if the gauge is fluttering instead of moving smoothly then it could be a cam lobe or valve problem.
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post #6 of 8 (permalink) Old Mar 23rd, 01, 02:42 PM
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You might want to check the timing chain if nothing else works. I had a timing chain in a 350 that had worn out and jumped 4 teeth, it caused that same popping under full throtle
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post #7 of 8 (permalink) Old Mar 23rd, 01, 10:38 PM
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Make double sure that your plug wires are in the right order and that you dont have a couple of the flip-flopped. When you changed the intake, did you change the carb too? From your question, it doesnt sound like you did. What type of intake did you add? Make sure your jetting didnt get leaned out from the higher flowing intake. Also make sure you have a fresh fuel filter...a really plugged filter can cause the same symptoms.

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post #8 of 8 (permalink) Old Mar 24th, 01, 03:59 AM
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I just went through this on my car. Turned out my floats were set too high and the car was running very rich. Check out the post Can't Stomp My 396 in the troubleshooting forum.

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