Closed loop.... When?
Thread Starter
Racer
Joined: Nov 2002
Posts: 300
Likes: 0
From: Perth WA
Closed loop.... When?
After starting a cold L98 engine. at what point does the engine go to closed loop?
I'm just interested as I have O2 sensor problems and the SES light comes on after I have been driving for a bit and an explanation on this would clarify a few things
Cheers
Tim
I'm just interested as I have O2 sensor problems and the SES light comes on after I have been driving for a bit and an explanation on this would clarify a few things
Cheers
Tim
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Re: Closed loop.... When? (timallard)
Hi Tim, go to 65Z01's site and click on the field service mode link. His site is chock full of good L98 information.
http://www.geocities.com/jgkov/index.html
:cheers:
J
http://www.geocities.com/jgkov/index.html
:cheers:
J
Thread Starter
Racer
Joined: Nov 2002
Posts: 300
Likes: 0
From: Perth WA
Re: Closed loop.... When? (Bowtie8)
It goes into closed loop around 132 F Water temp
Thanks for that.
Le Mans Master
Joined: Dec 1999
Posts: 8,540
Likes: 1
From: And on the fifth day, subpoenas were served to Obama senior staff
Re: Closed loop.... When? (timallard)
One O2 sensor on the drivers side y-pipe near the exhaust manifold.
Code 44 means ecm has gone closed loop, but O2 voltage is below 0.2V for more than 50 seconds.
Scanner could be a real help! I'd check for a shorted O2 sensor wire. Also you could be running very, very lean.
A source of false air into the exhaust such as an exhaust leak near the O2 sensor, faulty AIR diverter valve might cause the sensor to see a false lean condition. You could also disconnect the MAF sensor and see if the false lean condition goes away.
{edit} Could also have a shorted O2 sensor, never had one fail that way.
Good Luck
Pete
[Modified by PeteL, 9:08 PM 1/13/2003]
Code 44 means ecm has gone closed loop, but O2 voltage is below 0.2V for more than 50 seconds.
Scanner could be a real help! I'd check for a shorted O2 sensor wire. Also you could be running very, very lean.
A source of false air into the exhaust such as an exhaust leak near the O2 sensor, faulty AIR diverter valve might cause the sensor to see a false lean condition. You could also disconnect the MAF sensor and see if the false lean condition goes away.
{edit} Could also have a shorted O2 sensor, never had one fail that way.
Good Luck
Pete
[Modified by PeteL, 9:08 PM 1/13/2003]
