Question about 1994 Cadillac DeVille

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Excessive ping after engine is warm

No ping on start up, after operating temp, starts pinging, no codes present, or history codes, some say carbon,cat, converter semi clogged, vacuum leak., i have vac. guage, how much vac..should i get. any repair could be costly., got to try to pinpiont.

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  • chip111 Aug 18, 2008

    excessive ping after warm up. I use prem gas always. Have added octane booster. Had dealer tuneup the engine and still does it. Help

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Timing is off a bit and you might try running premium gas through it and add a bottle of heet to the tank,

Posted on Aug 13, 2008

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use an OBD II reader, $60 at Walmart.

Also try cleaning out your air intake. Carbon buildup can cause rough idle and hesitation. Run two or three cans of throttle cleaner through it, clean out the pathways from the EGR to the intake, put two shots of the LUCAS brand fuel system cleaner in it or SEAFOAM.

If it improves then there you go. If not, you may have other issue, take it to a mechanic or have a gearhead friend take a look.

The OBD will tell ou if theres any engine codes going off caused by something wrong.

use the Carb cleaner/Intake cleaner by removing the the air intake hose to the air box, use one hand to increas the throttle whiile spraying the cleaner through it. Make sure to rev it enough to keep it from stalling, bu tnot too much.

If you start seeing smoke come out your tailpipe, then you have carbon buildup.

If unsure about any of this. I suggest you make friends with a guy or gal that knows about cars, buy em a six pack and ask them what they think about it, eventually they wont be able to stop themself from helping you.

Good luck

Jun 17, 2008 | 1994 Cadillac DeVille

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