CEL and TCS lights
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Supra Freak...
Joined: Jan 2007
Posts: 6
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From: Dayton, OH, USA
CEL and TCS lights
Well, about a couple of weeks ago, I got a CEL light. I had an AutoZone person check it and here's what it said:
P1491
Manufacturer Control
Auxiliary Emission controls
Intermittently, I'll have the TCS light come on after driving it around (it doesn't do it often, but it will stay on until you turn the car off, then has a chance of saying off next time I drive). Also, when the car is warm, it will idle erratically, and that won't go away until you let it cool off (no matter if you turn the car off or not). I've stalled it twice during the erratic idle. No other readings are effected, temp is normal, fuel consumption seems a little down this tank, but I drove the whole last tank with the light and 20+ MPG combined, mostly city.
Any ideas? My personal opinion is that it's the EGR valve stuck open or something, but I figured I would ask first before replaicing $150 in parts.
Thanks in advance.
Chris.
P1491
Manufacturer Control
Auxiliary Emission controls
Intermittently, I'll have the TCS light come on after driving it around (it doesn't do it often, but it will stay on until you turn the car off, then has a chance of saying off next time I drive). Also, when the car is warm, it will idle erratically, and that won't go away until you let it cool off (no matter if you turn the car off or not). I've stalled it twice during the erratic idle. No other readings are effected, temp is normal, fuel consumption seems a little down this tank, but I drove the whole last tank with the light and 20+ MPG combined, mostly city.
Any ideas? My personal opinion is that it's the EGR valve stuck open or something, but I figured I would ask first before replaicing $150 in parts.
Thanks in advance.
Chris.
Team Owner
Joined: Sep 2006
Posts: 33,535
Likes: 1,142
Please give year model and miles when posting for help
If the EGR was stuck open you would be running full rich mixture- as if it were trying to warm up from dead cold.
Go smell the exhaust when running warm
If it stings its lean
If its rich you will smell it
Never hurts to read the 10 page thread here in Gen 2 titled "Seafoamed the Ol TL"
and go to parts store- spend 8 bucks and clean the whole intake injector pistons valves and all- makes big strides in running better
If the EGR was stuck open you would be running full rich mixture- as if it were trying to warm up from dead cold.
Go smell the exhaust when running warm
If it stings its lean
If its rich you will smell it
Never hurts to read the 10 page thread here in Gen 2 titled "Seafoamed the Ol TL"
and go to parts store- spend 8 bucks and clean the whole intake injector pistons valves and all- makes big strides in running better
Drifting
Joined: Sep 2005
Posts: 2,877
Likes: 128
P1491 is for insufficient EGR valve lift detected. This means the ECU commanded EGR lift and the EGR lift sensor is indicating the commanded lift did not occur. This can be a bad EGR, but could also be disconnected or damaged EGR vacuum line to EGR, faulty EGR vacuum solenoid, or even faulty ECU.
Look for easy things first, check vacuum line to EGR. W/ engine at 2000 rpm and fully warmed check for vacuum supply to EGR. If no vacuum, the EGR solenoid or vacuum supply is faulty. If you have vacuum, the EGR is faulty.
An Acura shop manual is handy to find things and perform the required tests.
good luck
Look for easy things first, check vacuum line to EGR. W/ engine at 2000 rpm and fully warmed check for vacuum supply to EGR. If no vacuum, the EGR solenoid or vacuum supply is faulty. If you have vacuum, the EGR is faulty.
An Acura shop manual is handy to find things and perform the required tests.
good luck
Advanced
Joined: Feb 2007
Posts: 74
Likes: 0
Originally Posted by 01tl4tl
Please give year model and miles when posting for help
If the EGR was stuck open you would be running full rich mixture- as if it were trying to warm up from dead cold.
Go smell the exhaust when running warm
If it stings its lean
If its rich you will smell it
Never hurts to read the 10 page thread here in Gen 2 titled "Seafoamed the Ol TL"
and go to parts store- spend 8 bucks and clean the whole intake injector pistons valves and all- makes big strides in running better
If the EGR was stuck open you would be running full rich mixture- as if it were trying to warm up from dead cold.
Go smell the exhaust when running warm
If it stings its lean
If its rich you will smell it
Never hurts to read the 10 page thread here in Gen 2 titled "Seafoamed the Ol TL"
and go to parts store- spend 8 bucks and clean the whole intake injector pistons valves and all- makes big strides in running better
you MUST be a seafoam rep
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