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Old 05-18-2008, 01:55 AM
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chevy 350 tbi pinging

bone stock lo5 roller motor rebuilt tbi new fuel pump and filter new reman. dist. and coil timing at 0 new custom chip for daily driver from tbi chip drinks 89 octane pings hard under load any ideas out there???

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Old 05-18-2008, 03:26 AM
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Whats the fuel pressure? how many miles are on the injectors? Have the injectors been replaced? Is the EGR still functional? When the pinging occurs can you ease down more on the throttle but the engine seems to not pick up any power? Or does it seem to have more and ping less with less throttle?
Mine had this issue, I replaced the stock injectors with Venom units, reset the fuel pressure and it made a big difference.
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Old 05-18-2008, 10:06 AM
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tbi rebuilt by affordable fuel injection injectors were rebuilt and tested. tried two fuel pumps. i agree has to be a lean condition now what??? egr gone block off plate no vacuum leaks egr taking off of chip tune

Last edited by frank88chevy; 05-18-2008 at 10:12 AM.
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Old 05-18-2008, 11:36 AM
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not an expert but i thought the egr acctually fends off detonation by cooling the cylinders a little im not sure that was the best thing to do with removing the egr
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Old 05-18-2008, 12:16 PM
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Quote:
Originally Posted by sheldonw
not an expert but i thought the egr acctually fends off detonation by cooling the cylinders a little im not sure that was the best thing to do with removing the egr
EGR is actually used to lower NOx emissions, it does fight detonation/spark knock, but that isn't its sole purpose..
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Old 05-18-2008, 01:55 PM
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Fix the EGR. An engine that is set up (spark timing) to work with EGR will knock of the EGR is eliminated and the spark timing curve and amount is not adjusted to compensate.
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