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Engine Pinging

 
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AllGMGuy
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PostPosted: Sat Sep 18, 2010 10:34 pm    Post subject:  Engine Pinging Reply with quote

My 2004 Impala 3.4L has developed a pinging / rattling upon acceleration. I've tried gas from another station. I've tried higher octane, but still pings. No check engine light. Ideas? Thanks.
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JenniEliz
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PostPosted: Wed Sep 29, 2010 3:40 am    Post subject:   Reply with quote

Hi and welcome. Sorry but I reallt can't determine anything from wha you've said. The only thing I could say is try a higher grade for a few fill ups.

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habermehl
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PostPosted: Wed Sep 29, 2010 7:37 am    Post subject:   Reply with quote

Welcome to naioa!

An engine can ping for many different reasons. Here is a list of the most common causes for pinging starting with the most popular ones.

Fuel octane rating too low.
Compression to high. (usually caused by carbon build up inside the combustion chambers)
Over heating of the engine or just an individual cylinder. (Hot spots)
Knock detector faulty.
Ignition timing over advanced due to incorrect setting or erratic ignition due to a worn distributor. Most modern engines no longer have distributors.
Blocked exhaust, giving a high backpressure. (A significant loss of performance will be noticed)

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Truckman
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PostPosted: Wed Sep 29, 2010 10:23 am    Post subject:   Reply with quote

When I last worked as a mechanic in the ritzy River Oaks section of Houston, I was often brought Cadillacs and Lincolns that "make that horrible noise when I push the gas"...Most of them were never driven over 25 mph so, after a hard run on the feeder roads to blow what I could out and get it hot, I got it back to the shop for a dose of Dr. Truckman's secret elixir...

On the carbureted ones, I just poured my 50/50 mixture of Dexron and ice-cold water down the carburetor throat while holding a high idle and when almost gone I dumped it down the intake to kill the engine...For those who don't think ATF and water will mix, it will mix long enough for use if shaken vigorously...After letting it cool off for an hour or so, I drove it on the freeway long enough to clear the smoke out, and voila, no more carbonized combustion chambers and no more ping...The little old ladies were happy again...

For the late model fuel injected cars, I had a pipe that plugged into the large vacuum port for the brake booster and, using a valve, got my mixture in the engine through that...The bonus was there were no more mosquitoes near the shop for a while... Cool ...Ben

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wanderson75
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PostPosted: Wed Sep 29, 2010 10:37 am    Post subject:   Reply with quote

Are you throwing a Check Engine Light? If so, posting up the codes here would be helpful.

When was the last time you replaced the plugs and wires? Inspecting the plugs might point you in the right direction.

Also, doing a Seafoam treatment in the crankcase, gas tank and intake might get some built up carbon out of the system.

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