Question about 1996 Cadillac DeVille

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My car kills when at idle. has low r/min at idle.

I had my egr valves replaced and my fuel system flushed and engine decarb but it still seems to kill. when i start it up the 1000r/min goes down to between 1 and 0 and when im at idle it does it to. for a while it didnt kill but it kill on me again when i stopped. when i start it right back up and hurry and drive it it runs fine but then i stop and sounds like it is about to kill.

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Check the Idle Air Ctrl (IAC) motor. It should allow air to bypass the throttle plate when starting and at idle. if it is not working it could cause veh. to stall.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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3_11_2017_5_29_14_am.jpg

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I have a 96 sonoma 2.2 thats running too rich and has a p1406 code


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After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

The purpose of you EGR Valve is to recycle un-burned fuel back into the engine, not only improving fuel economy by reducing the engines pumping losses, the EGR increases the mass in the intake; more mass means higher pressure, or less vacuum. Now the piston has less resistance during each intake stroke, which results in better gas mileage.

So if your EGR Valve is clogged, damaged or simply just not working - the those rich un-recycled fuels will make your car burn richer. (Which will make you burn more fuel.)

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Check idle air control system. The system comprises a valve that allow extra air into the engine when the engine is idle. If the valve is stuck, if there is a problem with IAC wiring or solenoid or if the vacuum hose connected to the IAC has a leak you get engine running rough and turning off when idle.

Check air intake and sensor (MAF and AIT). Replace air filter. Air intake problems may result in rich mixture and in engine turning off.

Check EGR and PCV valves. These parts may cause rough idle. When the problem is EGR or PCV you usually get troubles also when driving.

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