error code p1491
07-19-2011, 06:50 PM
#1
3rd Gear
Thread Starter
Join Date: Jul 2011
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
error code p1491
i have a acura tl 2.5 1998 and i went for my emmisions test and failed.. i have a engine light on and i read the codes with my mac tools scanner and the code came up as p1491... egr valve lift i dont know what to do .. please help
07-19-2011, 09:37 PM
#2
Three Wheelin'
It may be an electrical/sensor problem since P0140 is EGR insufficient flow, but I would just go ahead and clean EGR/intake chamber because it can only do good and no harm.
07-22-2011, 05:14 PM
#3
This code indicates "insufficient lift of EGR valve". What that means is the ECU commanded a certain lift of valve pintle, but did not measure adequate lift. It could be damaged or disconnected vacuum line, bad vacuum switching solenoid (blocked or stuck), or faulty EGR valve.
Check all vacuum lines to the EGR and EGR switching solenoid valve.
Check first for vacuum to the EGR valve. There should be none at idle and vacuum available above 2000 rpm w/ engine fully warm.
good luck
Check all vacuum lines to the EGR and EGR switching solenoid valve.
Check first for vacuum to the EGR valve. There should be none at idle and vacuum available above 2000 rpm w/ engine fully warm.
good luck
Thread
Thread Starter
Forum
Replies
Last Post
Jamus22
2G TL Problems & Fixes
24
06-11-2023 10:08 AM
