Rich Idle - Please Help!

[white01ss]

Just started tuning in Jan 08 so please bear with me...

The problem is that the car is rich at idle and a lean when cruising. It's got a S/C on it with SVO/Bosch green top 42lb injectors and a Racetronix fuel pump. Stock MAF w/screen.

What I've tried so far:

1) B4001 The IFR table is dialed in according to the injectors.xls
2) B3701 The Inj Pulse Width Voltage Adj table is dialed in. Got specs from Ford to adjust this table. The car was VERY lean in the 35kpa and up columns before bumping up that table. Tried pulling down the 30 kpa and under rows and it didn't make much of a difference.
3) B0101 Been tweaking on the VE table based on LTFTs and it's made a lot of difference in the 35kpa and up trims, but almost no difference in the 30kpa and lower under 2000 RPMs.

I noticed that my Injector Pulse Widths at idle have had a range of 1.892 to 2.107 ms. I can't seem to get the PCM to command a pulse width shorter than 1.892 ms even when the injector can do 1.13 ms!

I know, I know. I need a wide-band and do the AutoVE. I'm getting one in a month or so, but the car's inspection is out so I need a quick fix just so I can get it inspected. Right now, you can just smell the fuel when it's warmed up and idling. Any one have any ideas?

Thanks,
Dan

[white01ss]

Here's a version before where I raised the B4307 Desired Airflow 5%. This was to help the lean upper RPM cruise problem. B4308 Airflow Parked is also a little lower.

[white01ss]

bump for my stinky car

[hquick]

Hi Dan,
how did you come up with the IFR's in your tune?
I used the attached sheet (after searching for MANY hours on the net) and used 43.5 as the standard pressure for calc'ing the new IFR. I know alot of people say Ford use a diff pressure for calc static flow...but Marcin (REDHARDSUPRA) had 2 sets tested and at 43.5 they flowed close enough to 42 to call it OK.
This would mean your IFR table should look like:

6.110675
6.148759
6.186608
6.224227
6.261620
6.298791
6.335744
6.372483
6.409011
6.445332
6.481449
6.517367
6.553087
6.588614
6.623950
6.659099
6.694063

Also...how did you come up with the B3701 table and the others?

Thanks

[jfpilla]

Howard,
In the IFR calculator, I believe the 0-80 column should be labeled
MANVAC(kPa).
Joe

[hquick]

Thanks Joe...I don't think I can change it..I found it somewhere online.

[jfpilla]

Howard,
It wasn't locked, so I changed it.
Joe

[hquick]

Cool..thanks Joe.

Howard

[hquick]

Here's another injector sheet.
But...how do I use it?

[white01ss]

Hi Dan,
how did you come up with the IFR's in your tune?
I used the attached sheet (after searching for MANY hours on the net) and used 43.5 as the standard pressure for calc'ing the new IFR. I know alot of people say Ford use a diff pressure for calc static flow...but Marcin (REDHARDSUPRA) had 2 sets tested and at 43.5 they flowed close enough to 42 to call it OK.

Howard,

I used the following numbers. I have a Racetronix pump and the pressure is a little higher than stock.

Injector Rated Fuel Pressure: 39.5
Your Fuel Rail Pressure: 62.5
Injector Rated Flow Rate: 42

Injector Flow Rate (Grams/Second)
Manifold Vacuum kPa {link: GM.MANVAC}, Value
0 6.656250
5 6.695313
10 6.734375
15 6.773438
20 6.812500
25 6.851563
30 6.890625
35 6.929688
40 6.960938
45 7.000000
50 7.039063
55 7.078125
60 7.109375
65 7.148438
70 7.187500
75 7.218750
80 7.257813

Also, the car was already running rich, so I didn't want to make the problem worse by lowering the IFR.