Why did my car flatline?
Thread Starter
Joined: May 2005
Posts: 550
Likes: 0
From: Valdosta, georgia
Why did my car flatline? I ran my hptuners yesterday and it was wierd. Everything was like a perfect flatline. The o2 switching was flat too was hovering around 920mV. Didn't seem to effect the car and it's fine now just wondering what happened? Thanks
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
would help if you'd post a few things like...
1. your mods
2. what kinda car you have and year?
3. did you change anything before this problem?
4. what is flatlining? pictures are worth a thousand words
w/out any useful diagnostic info .... sounds to me like you're stuck in open loop .. probably have an SES light set..... ENG SEnsor fuse may be blown?
but really we need more info to try to diagnose what's wrong w/your car......
1. your mods
2. what kinda car you have and year?
3. did you change anything before this problem?
4. what is flatlining? pictures are worth a thousand words
w/out any useful diagnostic info .... sounds to me like you're stuck in open loop .. probably have an SES light set..... ENG SEnsor fuse may be blown?
but really we need more info to try to diagnose what's wrong w/your car......
Thread Starter
Joined: May 2005
Posts: 550
Likes: 0
From: Valdosta, georgia
It is an 02 WS6 and nothing major besides the headers and exhaust. I did not get an ses light. I don't have the scan cause my battery died and did not save it. I mean flatline by the O2 graph was moving a little bit but it stayed like between 910 and 930MV. I thought it might be stuck in open loop but anything that would cause this. But it's no biggie really it's back to normal now.
At WOT, that's what you'd be looking to see.
If cat overtemp protection had kicked in you
would get a persistent enrichment until it got
to feeling all safe and happy again.
Make the fuel-air multiplier (FAM) one of your
logging "standards". It will tell you a lot about
intent.
If cat overtemp protection had kicked in you
would get a persistent enrichment until it got
to feeling all safe and happy again.
Make the fuel-air multiplier (FAM) one of your
logging "standards". It will tell you a lot about
intent.
