I have a 99 cobra with a vortech rich at idle about 13.4 to 13.8. Perfect afr 14.7 while cruising
Any ideas where to start
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Any ideas where to start
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99 cobra rich idle
- Thread starter Cobragixxer9994
- Start date
You don't want 14.7 at WOT
What are you using gauge and sensor-wise?
Also, during cruise and idle it will bounce around a bit from 13-15 and it will go to like 20 when you're off the gas but in gear...and WOT should be like 11.5-12. Assuming you have a wideband sensor
What are you using gauge and sensor-wise?
Also, during cruise and idle it will bounce around a bit from 13-15 and it will go to like 20 when you're off the gas but in gear...and WOT should be like 11.5-12. Assuming you have a wideband sensor
Sorry I swiped to type and didn't proofread before I posted
Wide band is autometer with Bosch sensor
It definitely does not go lean at idle and it smells very rich at idle
wot is 11.3 to 11.8
Cruising definitely stables more towards 14.7
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Wide band is autometer with Bosch sensor
It definitely does not go lean at idle and it smells very rich at idle
wot is 11.3 to 11.8
Cruising definitely stables more towards 14.7
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Do you have cats?
13.4-13.8 isn’t bad. Do you know what stoich is in the tune? If it’s set to 14.1 (to account for 10% ethanol fuel) that idle is pretty good.
No cats and I am unsure what the stoich is set at
Am I just creating phantom problems for myself lol
cause the car has ran good for years
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Am I just creating phantom problems for myself lol
cause the car has ran good for years
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Has the sensor been calibrated recently?
I think you are creating a problem that isn’t there but who knows. What do the fuel trims say at idle? If they are within 5-10% I wouldn’t worry about it at all.
It has been replaced in 2021
Supposedly no calibration is needed
Unfortunately I am not datalogging with my sct
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Supposedly no calibration is needed
Unfortunately I am not datalogging with my sct
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Hook up Livelink and see what the narrow bands are doing. Find out if it's one or both banks.
I will do that today what am I looking for on my narrowbands ?
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They should be switching lean/rich/lean/rich…STFTs should be within +- 10%, with long terms being the same. Long terms won’t change as fast as the STFTs.
Do you have Longtube headers?
No long tubes ported Ford racing manifold with OR h pipe
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Did a live link log today not sure if all of this info matters
67f outside temp
Car coolant between 196 and 202 f
Stft bank 1 .97 to 1.00 fluctuating
Stft bank 2 .97 to 1.00 fluctuating
Ltft banks1 and 2 no change stays at 1.00
02 voltage bank 1 sensor 1 .09 to .93 average .75
02 voltage bank 2 sensor 1 .85 to .96 average .94
I think o2 sensor bank 2 sensor 1 is bad
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67f outside temp
Car coolant between 196 and 202 f
Stft bank 1 .97 to 1.00 fluctuating
Stft bank 2 .97 to 1.00 fluctuating
Ltft banks1 and 2 no change stays at 1.00
02 voltage bank 1 sensor 1 .09 to .93 average .75
02 voltage bank 2 sensor 1 .85 to .96 average .94
I think o2 sensor bank 2 sensor 1 is bad
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Up
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That does seem like a wide range for the bank 2 sensor. I would do the old school method of swapping sensors side to side and see if the readings follow. If they do you know it's the sensor. Or if it's been a while, throw new sensors in.
They were done in 2016
I was stupid and I ran leaded fuel last year.
Possibly that screwed up the sensor.
If I'm gonna swap the sensors I might as well just replace them. There fairly cheap
$25 a piece for ntks
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I was stupid and I ran leaded fuel last year.
Possibly that screwed up the sensor.
If I'm gonna swap the sensors I might as well just replace them. There fairly cheap
$25 a piece for ntks
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Leaded fuel kills them pretty quick.
Yea I wasn't thinking when I did it was free(friend was switching to e85)and my car had the race fuel smell lol.
So I think it's safe to say I should probably just change them.
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So I think it's safe to say I should probably just change them.
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Well new o2 sensors seemed to have fixed it idles between 14.3 and 15.1 on the wideband.
Thank you for the help
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Thank you for the help
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