Afr help... possible injector issue

[enriquez2000]

I sealed all exhaust leaks this week but here is my issue.

I set target afr to 15.8 and as i drive it stays atound 14.8... if i let off throttle it jumps to 10 before leaning out and then settles to 14.8ish idle. If i wot it sometimes drops below my 12 setting but usually stays fine there.

I think it may be an injector dripping/leaking giving it more fuel than it should. What do you dsm guys think?

 

[lasthope05]

No. Idle and cruise is part of closed loop operation and you can not adjust factory stoic values without either tricking the ecu or tuning the car to run full time open loop.

 

[enriquez2000]

No. Idle and cruise is part of closed loop operation and you can not adjust factory stoic values without either tricking the ecu or tuning the car to run full time open loop.

so even with link you cant? Ive talked to guys cruising at 15.8 afr with e85.. i would think with adjusting the maps you could?

 

[enriquez2000]

also what about it going to 10 to 1 when releasing throttle?

 

[lasthope05]

Yes. Even with link you cannot control closed loop operation. Like I said in my previous post. It is either done by tricking the ecu(narrowband sim) or running the car in open loop.

As for going rich, that can be a myriad of things. Venting the bov, boost leaks, tps/idle swtich, fuel trims...etc. I dont know your setup. What tests have you done to make sure the car is in good working order?

 

[enriquez2000]

Yes. Even with link you cannot control closed loop operation. Like I said in my previous post. It is either done by tricking the ecu(narrowband sim) or running the car in open loop.

As for going rich, that can be a myriad of things. Venting the bov, boost leaks, tps/idle swtich, fuel trims...etc. I dont know your setup. What tests have you done to make sure the car is in good working order?

I did blt and compression...BLT led to throttle body rebuild and replacing fpr because of leaks. bov is not vented... problem didnt start until I swapped to e85 and injectors that I had in another car. I have bad valve seals which will be fixed soon. I had exhaust leaks that you could see with the bad valve seals. They would puff smoke out of exhaust manifold to turbo and turbo to o2... those are now gone and unfortunately running open downpipe until I finish the exhaust. o2 sensor was originally in the o2 housing but I moved it 36inches downstream in the pipe as per innovates recommendation with same readings as before.

My fuel trims are never over 2%...

Before the swap I would let off gas and instantly go 22.4(all lean) because gas wasnt being provided. Now itll blip to 10 for a bit and then go lean like it is supposed to.

 

[lasthope05]

I would put the sensor back in the stock location. The further away your wideband is from the motor more delay there is from actual readings.

Have you properly setup up your tps? idle switch working? Got logs?

 

[enriquez2000]

I was feying o2 sensors in stock location... every week or i wouldnt have moved it. Tps is good.. simulated idle switch... ill do a log on way home

 

[enriquez2000]

you can see it here

 

[lasthope05]

You need to properly adjust your ISC.

 

[enriquez2000]

You need to properly adjust your ISC.

It sits at 32 when at a parked idle

 

[lasthope05]

Looked high to me. Bring it down a touch if you can and put the wideband back in the stock location then get a new log. I didnt know you are running narrowband sim, but you dont what to run the sensor that far back when its controlling closed loop functions.

 

[enriquez2000]

Stock location was killing o2 sensors. Literally weekly. Issue was present when it was in that location too.