Do these numbers look right?

[Bobby Fazio]

One screenshot is car idling, the other is at 2500 rpms. Still running rich as hell. I am out of things to check and not familiar enough with DFI to change anything internal.

[Alan Roehrich]

Bobby, according to that, your air/fuel ratio is over 14:1. That's not rich, that's lean.

[art leong]

Where is the O2 sensor located? If it's in the collector, how far from the end?
I had all kinds of problems trying to tune for low rpms. Till I put in an upstream O2 sensor.

[Chad Rhodes]

Originally Posted by art leong

Where is the O2 sensor located? If it's in the collector, how far from the end?
I had all kinds of problems trying to tune for low rpms. Till I put in an upstream O2 sensor.

Art has a point. If your wideband is in the collector, try sliding about a 2ft extension on that collector to tune low rpm stuff. The reversion is killing your accuracy, that won't be a problem at WOT

[Bobby Fazio]

I do have it in the collector but I'm running in open loop so there is no correction coming from the o2 sensor. With that said, the air fuel ratio isn't fluctuating at all which seems odd.

[Dave Noll]

Bobby,
I was a driveability mechanic for a number of years & my stocker is pre-computer. That said, I'm not familiar with this software. I don't know if it disregards O2 input in open loop but beside's the 14.35 AFR in both graph's the "O2 FBK" is 0 as well. I don't know how cold PA is right now but to get the coolant to 80, that 02 should read something. What I really don't like is the MAP is reading almost atmospheric @ 1200. 7.5ms pulse width is really fat for idle, it does go to 6ms, still fat, revved up but the MAP still looks low.. Vacuum line problem, dead MAP, ........ do you have spare parts that you can A.B.A. test with ? Can you also backprobe the 02 connector with a DVOM to get an actual reading from it ? Does this use the stock MAP sensor ?

[Angelo DiTocco]

Originally Posted by Bobby Fazio

One screenshot is car idling, the other is at 2500 rpms. Still running rich as hell. I am out of things to check and not familiar enough with DFI to change anything internal.

Bobby - what combo is the system on? a race car? let me know.
what is it doing - loading up and stalling?

3 quick things
1 - an 02 sensor won't be hot enough to work correctly or read accurately at idle (unless it has a pre-heating element in it - some do, some don't) so tuning a car at idle is trial and error.
2 - your coolant temp is 80 degrees - it could be running rich because it thinks its in warm-up mode - faulty temp sensors can do that too - they are cheap I'd change that as well.
3 - i dont know what your running it on but sometimes the throttle blades need to be opened up and the TPS reposition to read right.

b

[buzzinhalfdozen]

Bobby, first don't beat yourself up over it, learning new things can be a daunting task, second it makes perfect sense that the intake valve being bent was allowing pressure back into the intake manifold throwing your MAP reading out in left field. Congrats on finding it and please let us know how it runs after the repair. Joe

[art leong]

Don't know if this will help. But some tuners aren't concerned with low rpms, just horsepower and torque. I brought my car home from a dyno tune a couple of years ago. And it was so rich my eyes were tearing when I put the car in the trailer. I then tried to tune it down low. And made it worse. I went to the track and tried to tune the leave and slowed it up half a second. My plugs would get sooty black driving around the pits. Tried changing plugs, wires etc. No help.
Then I thought about it a while. I was leaving with a 2 step. Which I thought would make it rich, because it wasn't burning fuel in 1/4 of the holes. Then it dawned on me that it is an "Oxygen" sensor not an unburnt fuel sensor. Also I found that below 4000 rpms my wide band O2 sensor in the collector was useless (unless I put a 3' extension on it).
I put in an upstream O2 sensor about 14" from the valve. I use that to tune low rpms. When leaving using the 2 step I just try one thing or another and if it picks up I try a little more till it slows. If it slows right away I go the other way. 99% of the time I have dead hook so no variables there.