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#1
02-11-2010, 02:25 PM
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Engine idle and P0440
About 2 months ago I went out to my car to start it and it started and then died. It would not hold idle. After reving and driving around, it started to hold a low idle at about 600-700 rpm. After about 30 minutes it was back to an idle of about 900 rpm. The problem did not occur again till 2 days ago. Same basic thing. After driving to work it would hold a low idle. When I went to drive it at lunch time the idle was back to normal. Then yesterday I get a SES light. I pulled the code and it gave P0440. I checked the gas cap and it seemed secure but refastened it anyway. As of today, the SES light is still on and the idle is okay again. Are these realated? What should I do next?
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2001 Grand Prix GTP S/C 
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#2
02-11-2010, 02:33 PM
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Re: Engine idle and P0440
The EVAP system is no longer functioning, it's designed to reduce fuel emissions into the atmosphere.
suspect - Gas cap carbon canister purge valve (fuse) *** rubber hoses
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#3
02-11-2010, 06:40 PM
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Re: Engine idle and P0440
Evap codes will normally not cause a drivability issue so I say the two are not related.
On the Idling issue, I would clean the IAC valve and its bore. If that does not help, you may need to replace the IAC motor.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#4
02-11-2010, 11:30 PM
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Re: Engine idle and P0440
It has been a while since I've seen another Utahn on here!
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  2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl.
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#5
02-16-2010, 03:35 PM
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Re: Engine idle and P0440
On my 2002 GP SE the SES light come on (steady). Autozone read the code for me (P0440). I had an aftermarket locking gas cap that has been on for 5 years. I replaced the cap with the OEM cap and erased the code with Actron code reader. The SES has not returned (2 months). I re-examined the locking gascap and found that the gasket has multiple small cracks. Also replaced the connector hose comimg from the PCV since it seemed to be somewhat deteriorated. The hose is molded into a 'U' shape so bought the OEM from GM rather that use standard hose.
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