Curve ball QUESTION!! EXPERTS
09-21-02, 11:31 AM
#1
Full Member
Thread Starter
Join Date: Jul 2002
Location: Illinois
Posts: 131
Likes: 0
Received 0 Likes
on
0 Posts
Curve ball QUESTION!! EXPERTS
Question regarding 02 Sensor,
Today was a interesting day. I took off my original 02 Sensor and guess what I found out...it was dead, burnt, busted!
Now here's the question...could this have contributed to these problems...
Converters prematurely dying?
Car running rich?
Oil consumption?
1988 none turbo RX7
Today was a interesting day. I took off my original 02 Sensor and guess what I found out...it was dead, burnt, busted!
Now here's the question...could this have contributed to these problems...
Converters prematurely dying?
Car running rich?
Oil consumption?
1988 none turbo RX7
09-21-02, 11:34 AM
#2
Huh?
Join Date: Nov 2001
Location: Lost
Posts: 1,087
Likes: 0
Received 0 Likes
on
0 Posts
Yes, it could have contributed to at least the 1st 2, if not all.
The 02 sensor provides the ECU with Air:Fuel ratios, which adjusts the mixture to whatever it is supposed to be. If the oxygen sensor is broken, the ECu has no idea what the mixture is, and will pump that extra fuel which is why you are running rich. When you run rich, it wears out the cat alot quicker cause theres a lot more stuff to filter in the exhaust.
The 02 sensor provides the ECU with Air:Fuel ratios, which adjusts the mixture to whatever it is supposed to be. If the oxygen sensor is broken, the ECu has no idea what the mixture is, and will pump that extra fuel which is why you are running rich. When you run rich, it wears out the cat alot quicker cause theres a lot more stuff to filter in the exhaust.
09-21-02, 02:37 PM
#5
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Join Date: Jun 2001
Location: London, Ontario, Canada
Posts: 3,106
Likes: 0
Received 0 Likes
on
0 Posts
I put in a new bosch O2 sensor last week and it seems to kick it into closed loop in the city, any time it's maintaining a decent speed or mild acceleration. eg. crusing at even 30kph. With just a dab of throttle or none it's open loop. A fuel injection book from C. Probst indicates it should be in closed loop at idle (mine isn't). So other than high throttle or throttle lift, when *should* it be in closed loop?
Last edited by Snrub; 09-21-02 at 02:45 PM.
09-21-02, 02:40 PM
#6
Full Member
Thread Starter
Join Date: Jul 2002
Location: Illinois
Posts: 131
Likes: 0
Received 0 Likes
on
0 Posts
thx =)
i HOPE TO HAVE MY CAR UP AND RUNNING SOON. I've decided to wait until I install the new cat's before I replace the O2 Sensor. I think that makes sense!
i HOPE TO HAVE MY CAR UP AND RUNNING SOON. I've decided to wait until I install the new cat's before I replace the O2 Sensor. I think that makes sense!
Trending Topics
09-21-02, 03:49 PM
#8
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
Under cruise, it should be closed loop. What I meant is that the O2 sensor is hardly used in the city because you're so often in open loop. Though I guess it matters where you are...
09-22-02, 01:13 AM
#10
Senior Member
Join Date: Mar 2001
Location: Vancouver
Posts: 429
Likes: 0
Received 0 Likes
on
0 Posts
The ECU will go closed loop under light throttle when the engine is warm. It will go open loop if:
1. the engine is cold
2. your giving it some throttle
3. your above 3800 or so rpm's (regardless of throttle)
4. Idle. At idle the A/F is trimmed by the var resisitor on the passenger side shock tower.
5. Your O2 sensor is bad
Decel gives fuel cut which I guess you could say is open loop or 'no loop'...
Henrik
87TII
1. the engine is cold
2. your giving it some throttle
3. your above 3800 or so rpm's (regardless of throttle)
4. Idle. At idle the A/F is trimmed by the var resisitor on the passenger side shock tower.
5. Your O2 sensor is bad
Decel gives fuel cut which I guess you could say is open loop or 'no loop'...
Henrik
87TII
Thread
Thread Starter
Forum
Replies
Last Post
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM
gabescanlon
3rd Generation Specific (1993-2002)
4
09-05-15 12:04 AM
