can some one give me some idea's what could be casuing it.. when crusing around out of boost the afr's are all over the place. I have checked the plugs replaces the up stream o2 sensor. my wideband is in the downstream location spot on the injen downpipe, which is like the shape of a "Y" could that be it?? what could be going on?? cause when you get into boost they seems good.. please help
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Are you still on Stage 0 stock computer??? If so the PCM still needs the downstream O2 sensor, I just ran into the same probs that you have and I replaced my downstream and the problem is non-existant now
Are you still on Stage 0 stock computer??? If so the PCM still needs the downstream O2 sensor, I just ran into the same probs that you have and I replaced my downstream and the problem is non-existant now
anthony,
He has Stg1 and a DBB 50 trim, return line w/38 psi of fuel, 750's, W/Inj and a DTEC. The car will idle from the mid 13's to the upper 14's but not really cleanly. But when he gives it throttle the afrs start to richen and once in a while go lean for a sec. They go in the 11's? BTW the stock downstream 02 is still plugged in to the ecu but not in the exhaust.
During WOT it is all good. Or so it seems. It's currently tune to mid 11's in the midrange down to 11.2 @ redline.
Nasty's Injen DP has a 1.5" diameter tube off of the DP near the flex section that the 5-6"s long and runs "towards" the front of the car. It forms a Y pipe looking arrangement. The WB sensor is set in there. To me it seems to be out of the natural flow of the exhaust and may be the culprit.
It's either that or the ecu struggling mightily to go "stoich". He has plenty of low load correction in the 25/50/75 columns. In the 20's to high teens. Maybe it needs more?
I put in my LM-1 and it did not change the results. I guess the next thing is to either use a scantool and check FT's or move the WB location.
Anyone with any thoughts?
FYI,
Marion
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Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
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Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
If it was only at idle those would be good numbers, it's when the accelerator is pushed it richens up to the 11's like an accelerator pump on a carburator.
Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
If it was only at idle those would be good numbers, it's when the accelerator is pushed it richens up to the 11's like an accelerator pump on a carburator.
Marion
Did this just start happening or was something changed or installed recently?
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Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
If it was only at idle those would be good numbers, it's when the accelerator is pushed it richens up to the 11's like an accelerator pump on a carburator.
Marion
Did this just start happening or was something changed or installed recently?
dan,
AFAIK he has had this problem for quite a while. I believe that his last install was the Coolingmist Supa Dupa Controller kit.
Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
If it was only at idle those would be good numbers, it's when the accelerator is pushed it richens up to the 11's like an accelerator pump on a carburator.
Marion
Did this just start happening or was something changed or installed recently?
dan,
AFAIK he has had this problem for quite a while. I believe that his last install was the Coolingmist Supa Dupa Controller kit.
Marion
Does his w/i come on via boost switch or via TPS voltage. Not firmiler with the controler but a shot in the dark cause you mentione when he hits the gas even at idle it goes rich just a guess if its run off TPS could it activate the system??? I think some controlers use the MAP never heard of using the TPS.
Generally in Closed Loop the PCM wants to keep a 14.0-15.2 AFR...If he's showing 13s-low 14's maybe the PCM is having problems pulling all that fuel to keep the "stock" fuel trim
If it was only at idle those would be good numbers, it's when the accelerator is pushed it richens up to the 11's like an accelerator pump on a carburator.
Marion
Did this just start happening or was something changed or installed recently?
dan,
AFAIK he has had this problem for quite a while. I believe that his last install was the Coolingmist Supa Dupa Controller kit.
Marion
Does his w/i come on via boost switch or via TPS voltage. Not firmiler with the controler but a shot in the dark cause you mentione when he hits the gas even at idle it goes rich just a guess if its run off TPS could it activate the system??? I think some controlers use the MAP never heard of using the TPS.
It's boost regulated but not for certain if it is pressure or map voltage. Nevertheless we had the box unplugged when we baselined the fuel and boost and it was whacky. Only after it was where we wanted it did we add the w/inj.
Nasty's Injen DP has a 1.5" diameter tube off of the DP near the flex section that the 5-6"s long and runs "towards" the front of the car. It forms a Y pipe looking arrangement. The WB sensor is set in there. To me it seems to be out of the natural flow of the exhaust and may be the culprit.
Marion
I'm really confused...a 1.5" diameter downpipe??? Is this some sort of open wastegate? and the wideband is in that?
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weird afr's in close loop
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