installed some long tubes..
04-08-2006, 10:41 PM
#21
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Originally Posted by Flyer
Just for search purposes ... you can unplug the front o2's and drive all you want with open headers.
With open headers, the fresh air comes back in and hits the o2's making the PCM think it's running very lean, thus dumping more and more fuel, resulting in +25 ltrims and low o2 readings.
With open headers, the fresh air comes back in and hits the o2's making the PCM think it's running very lean, thus dumping more and more fuel, resulting in +25 ltrims and low o2 readings.
problem fixed..
but what is this about vette O2's and the stock O2's not reading?
I havnt noticed anything diffrent about the readings I have been getting?
do I need to put diffrent ones in???
more info needed please
04-08-2006, 11:50 PM
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Originally Posted by 01 Thunder
that would explain it..
problem fixed..
but what is this about vette O2's and the stock O2's not reading?
I havnt noticed anything diffrent about the readings I have been getting?
do I need to put diffrent ones in???
more info needed please
problem fixed..
but what is this about vette O2's and the stock O2's not reading?
I havnt noticed anything diffrent about the readings I have been getting?
do I need to put diffrent ones in???
more info needed please
I'll try to explain it alittle better. Your stock 02's are calibrated to switch in the stock location. Moving them downstream with long tubes can through them off, more so if the headers are uncoated as the 02 sensors are heat dependent. The fix for this is to find a 02 sensor with a better heater in it.
In my case I have uncoated headers and my 02's moved about 10-12" downstream. My trims went to crap and I was throughing Codes for 02 Slow Response. My 02 wave was very lazy and jagged. So I bought a wideband to verify them. After I tuned my trims I was showing -15 -10. After replacing them with the 13111's They were switching properly and nice wave graph and no codes.
One of the new sensors took a crap in less than a year. I just tune in open loop now.
04-08-2006, 11:51 PM
#23
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Ceramic coated headers tend to carry suffecient amounts of heat to the collectors as oopose to uncoated headers. If that was the case, the o2's not being hot enough, you would see rich conditions from the o2's giving an inaccurate reading. Then you may need the vette REAR o2's.
04-09-2006, 12:01 AM
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Originally Posted by Flyer
Ceramic coated headers tend to carry suffecient amounts of heat to the collectors as oopose to uncoated headers. If that was the case, the o2's not being hot enough, you would see rich conditions from the o2's giving an inaccurate reading. Then you may need the vette REAR o2's.
Just keep in mind there not a direct fit. You will need to swap the ends. I have a few customers with ceramic coated headers with the same problem. Mainly Hooker headers.
04-09-2006, 09:58 AM
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mine are coated..
and I havnt seen any major problems with them..
ltrms are sitting at +2 for the moment, but I am correecting that..
thanks for the info
and I havnt seen any major problems with them..
ltrms are sitting at +2 for the moment, but I am correecting that..
thanks for the info
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