teggy bogging out
04-04-2011, 02:12 PM
#21
Registered Member
Join Date: Sep 2010
Location: VB
Posts: 159
Likes: 0
Received 0 Likes
on
0 Posts
04-04-2011, 03:46 PM
#23
Registered Member
Join Date: Jul 2005
Location: Richmond
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
Re: teggy bogging out
Your post doesnt make a lot of sense. What readings are you refering to? For O2 sensors there are a few readings or causes for O2 sensor codes:
Oxygen sensor defective circuit or unplugged / defective sensor, Heater circuit malfunction, System Too Lean or Too Rich malfunction in the fuel monitoring systems, and then the Oxygen Sensor high voltage, low voltage, or slow response.
How the **** is unplugging your O2 sensor going to help find the problem? IT PUTS THE CAR INSTANTLY IN LIMP MODE!!!!! (car goes to open loop and a 2500rpm limiter is set)
Oxygen sensor defective circuit or unplugged / defective sensor, Heater circuit malfunction, System Too Lean or Too Rich malfunction in the fuel monitoring systems, and then the Oxygen Sensor high voltage, low voltage, or slow response.
How the **** is unplugging your O2 sensor going to help find the problem? IT PUTS THE CAR INSTANTLY IN LIMP MODE!!!!! (car goes to open loop and a 2500rpm limiter is set)
The oxygen sensor only adjusts +/- the fuel trim based on the oxygen sensor readings, with out one it would just run the programed fuel map values.
I think you might be reading into my post a little too much, if it narrows things down, great. If not, he can plug it back in. It's not really a big deal.
04-05-2011, 03:28 AM
#24
Registered Member
Join Date: Sep 2010
Location: VB
Posts: 159
Likes: 0
Received 0 Likes
on
0 Posts
Re: teggy bogging out
Are you talking about OBDII? I was refering to OBDI, but I'm pretty sure regaurdless a lack of a O2 sensor on a Honda would not cause a limp mode condition.
The oxygen sensor only adjusts +/- the fuel trim based on the oxygen sensor readings, with out one it would just run the programed fuel map values.
I think you might be reading into my post a little too much, if it narrows things down, great. If not, he can plug it back in. It's not really a big deal.
The oxygen sensor only adjusts +/- the fuel trim based on the oxygen sensor readings, with out one it would just run the programed fuel map values.
I think you might be reading into my post a little too much, if it narrows things down, great. If not, he can plug it back in. It's not really a big deal.
Your missing part of the equation MAP, IAT, and O2 readings make up the AFR... When the car runs the "programed fuel map values" is called OPEN LOOP. Thats not okay unless the car is tuned, because then his car will be running rich or lean all the time (mostly rich for safety) until he hits that 2500rpm limiter for limp mode.... You pretty much just took what I said and made it NON-technical...
04-05-2011, 04:07 AM
#25
Registered Member
Join Date: Jul 2005
Location: Richmond
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
Re: teggy bogging out
I don't think you're getting my point.
I've dealt with this multiple times as to know that, first of all, I have never seen an OBDI (p28, p30, P72 ect) ECU have a 2500 limp mode caused by a bad O2 sensor. I'm willing to bet I never will as there is no limp mode caused by a bad O2 sensor.
Second, that a bad O2 sensor can most definitely cause these conditions, hence me suggesting it. In fact, I'm surprised how much fuel compensation the ECU allows because of oxygen sensor readings.
He said it is a stock LS, the car is tuned from the factory. sure it will run slightly rich for saftey but for diagnostic purposes what I suggested will still work, or he could try it your way and throw parts at the car since he has no CEL to tell him what's wrong with it?
I also realize that this could be a bad Map, Iat, or maybe even TPS, but the fact that he has no check engine light is leading me to believe that none of those are the case. I've seen multiple bad IAT's not throw a CEL, but they havn't made a car bog terribly either.
I've dealt with this multiple times as to know that, first of all, I have never seen an OBDI (p28, p30, P72 ect) ECU have a 2500 limp mode caused by a bad O2 sensor. I'm willing to bet I never will as there is no limp mode caused by a bad O2 sensor.
Second, that a bad O2 sensor can most definitely cause these conditions, hence me suggesting it. In fact, I'm surprised how much fuel compensation the ECU allows because of oxygen sensor readings.
When the car runs the "programed fuel map values" is called OPEN LOOP. Thats not okay unless the car is tuned, because then his car will be running rich or lean all the time (mostly rich for safety)
I also realize that this could be a bad Map, Iat, or maybe even TPS, but the fact that he has no check engine light is leading me to believe that none of those are the case. I've seen multiple bad IAT's not throw a CEL, but they havn't made a car bog terribly either.
Thread
Thread Starter
Forum
Replies
Last Post