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2005 Deville
2012 CTS AWD, 2005 DeVille
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62 Posts
Discussion Starter #1
I tried to search the forum and find a solution, but couldn't find any info. I have a 01 DeVille with a 4.6L that has a real intermittent problem. On occasion, the car will stall when starting and I have to keep my foot on the gas to keep the RPMs up enough to get it running. Other times, the acceleration will stick like the cruse control is on. I was going 45 mph yesterday without my foot on the pedal. This happened a few months ago and I cleaned the MAF. It did not happen again until yesterday. Stall on start, acceleration sticking. Today, I pulled into work and the RPM's were at 1800. Hit the pedal and it went to 3500 and took a minute to drop back to 1800. Turned the car off and restarted and normal 750 RPM's only seconds later. Do I need to clean the MAF again? There are no on-board codes and it is such an intermittent problem that it is hard to diagnose. Any suggestions?
 

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Registered
2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
How was it cleaned? Both sides and perimeter of the throttle plate, as well as the bore?
 

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2005 Deville
2012 CTS AWD, 2005 DeVille
Joined
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62 Posts
Discussion Starter #6
Took the MAF off and cleaned the throttle body better. That seemed to do the trick! Time will tell. Thanks!
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,824 Posts
Took the MAF off and cleaned the throttle body better. That seemed to do the trick! Time will tell. Thanks!
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did you check for codes?
 

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Registered
1991 Deville
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97 Posts
Had a similar issue with a other sucking air from tb base gasket till warmed up. ecm tried to compensate
 

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2005 Deville
2012 CTS AWD, 2005 DeVille
Joined
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62 Posts
Discussion Starter #10
Cleaned the hell out of the throttle body. Today RpMs ran high again, but it didn't stall yet.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,778 Posts
Continue your cleaning spree to the IAC and its bore.
 

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Registered
2002 STS, 2005 CTS 3.6
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413 Posts
Take out the IAC, clean it and screw in the plunger at the end as they usually come loose over time and then seize up with gunk.
 

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2005 Deville
2012 CTS AWD, 2005 DeVille
Joined
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62 Posts
Discussion Starter #14
Had a friend that had an extra IAC, so we put it in. I think that solved the problem!
 
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