93 Coupe Deville 4.9 Ignition Timing please help - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 93 Coupe Deville 4.9 Ignition Timing please help in Past Cadillac Vehicle Discussion; If your EGR valve (Exhaust Gas Recirculation) is stuck shut or is sticky/slow it WILL cause an off-idle and acceleration ...
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    Re: 93 Coupe Deville 4.9 Ignition Timing please help

    If your EGR valve (Exhaust Gas Recirculation) is stuck shut or is sticky/slow it WILL cause an off-idle and acceleration ping. Remove it and clean the pintle and passages. Not sure whether your setup is electrical (operating motor) or vacuum. That's in your service manual set.

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    Re: 93 Coupe Deville 4.9 Ignition Timing please help

    The 4.9 is vacuum.

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    Re: 93 Coupe Deville 4.9 Ignition Timing please help

    It's a combination of both. There's an electrical solenoid that passes vacuum to the valve - not a direct link to the manifold. If the solenoid is bad, no EGR.

    That said, does the engine ping under certain conditions (full throttle, half throttle, cruise, etc) or all of the time?

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 93 Coupe Deville 4.9 Ignition Timing please help

    Have you cleaned out the EGR tubes under the TB?

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    Re: 93 Coupe Deville 4.9 Ignition Timing please help

    Quote Originally Posted by Jonathan11 View Post
    What's a good way to check the EGR?
    While it is idling reach under the valve and lift up on the diaphragm. It should kill the engine if it is working. If it doesn't, look at the tubes down in your intake manifold. Hold open the throttle, engine shut off, look to see if the tubes under the throttle plates are open or plugged.

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