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Re: Pinging (pre-ignition) under light load. 200 1984

posted by  someone claiming to be Jason Kneier on  Wed Feb 16 02:13 CST 2000 [RELATED]

There are a number of factors that can make an engine ping. Unfortunately, our high-compression B23Fs are very easily provoked into doing it. I had a similar knocking problem on my '83 240 B23F, and it was a vacuum leak. Search around every seal, junction, gasket and hose from the AMM to the block, including the fuel injectors and the brake master cylinder/booster junction (ask how I know :) ) using a length of hose placed to your ear.

Also, did you torque your new knock sensor down to 7-8ft-lbs? This figure is critical to the sensitivity of the sensor. Too tight, and you'll be retarding all the time. Too loose, you'll get excessive ping.

The suggestions about carbon build-up are also good. It may also help to run a bottle of Techron or that BG-44K stuff that cleans your injectors, take it out on the highway, and 'burn out the gunk' with some sustained high-rpm blasting. Be sure you change your oil after using one of these products.





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