1995 Olds 88 stalls intermittently, intake gasket related?

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1995 Olds 88 stalls intermittently, intake gasket related?

Unread post by hooah175 » Sun Jun 02, 2013 12:39 am

1995 Olds 88 with (112 K miles) stalls intermittently, usually when idling (after it clears open loop) and sometimes when decelerating. Stalling frequency increases when there is moisture in the air (high humidity or rain). Once stalled, car starts up again no problems. CEL appears, throws P0401 EGR insufficient flow code. Replaced EGR. No change. Still stalls and throws same code. Checked and cleaned new EGR valve, pintle moving, ports open and clear including at intake. Mechanic friend cleaned MAF, replaced TPS checked all other sensors. No joy. Could intake manifold gasket failure be causing this problem? Un-metered air seeping past intake gaskets causing stall? Any advice appreciated!

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Re: 1995 Olds 88 stalls intermittently, intake gasket relate

Unread post by TerryAuto » Sun Jun 02, 2013 9:05 pm

Yes, a vacuum leak for sure will cause a stalling at idle or on de-cel.
The P0401 code can also be set by a bad oxygen sensor. That is how the code is set. After EGR commanded, the PCM looks for the oxygen sensor to go lean, confirming the valve opened. If the O2 sensor does not move a certain amount of voltage within a certain time frame, the P0401 will set. Look at O2 data and make sure it is fluctuating properly.

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