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Old 05-22-2019, 11:07 AM
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
maf car

350 showing lean at idle.
ZZ4 cam 24 lb injectors
Not sure how to add fuel at low RPMs.
Any help appreciated.
Old 05-22-2019, 11:47 AM
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Re: maf car

You need to add fuel in maf 1
Old 05-22-2019, 11:53 AM
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Car: 89 Iroc-z
Engine: 555 BBC Turbo
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Axle/Gears: Strange 12 bolt 3.42
Re: maf car

Yup maf table 1. Maybe 2 depending how much rpm and load. Kinda watch rpm and current logged maf flow value and go to that value in table 1 or 2, and increase the values at and around whatever your logged value was.

like 1200 rpm 16 grams/s... go to table 1 and find where 16 is and increase the cell above and below some
Old 05-23-2019, 10:05 AM
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Re: maf car

Don,
What kind of injectors? P/N?
Old 05-23-2019, 12:23 PM
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Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: maf car

Bosch SVO 24's

The heated 02 just lays flat until I blip the throttle.
Old 05-23-2019, 02:15 PM
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Re: maf car

Are these the Bosch IIIs? Any way to snap a photo of them?

O2 stays flat at what voltage?

Anyway to get a tunerpro datalog?
Old 05-24-2019, 09:29 AM
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Re: maf car

But the tops are blue instead of red and 02 at 100-200
Old 05-24-2019, 10:25 AM
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Re: maf car

Quick try is move maf scalar 1 up two values and see what happens lol
Old 05-24-2019, 12:25 PM
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Re: maf car

I'm helping someone with those same injectors. Should probably make sure you have the right voltage offsets for them...

http://forum.efidynotuning.com/viewtopic.php?t=464

I think these are ones...
Old 05-25-2019, 01:53 PM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: maf car

I've added fuel in the MAF table 1 and 2. I've dropped the injector constant from 24lbs down to 16lbs. The O2 at idle is still in 100mv range or less, and BLM is at 160.

But as soon as you open the throttle, the heated O2 responds normally and does a good sine wave.
Old 05-25-2019, 02:14 PM
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Re: maf car

Kevin,

What is the voltage at the keyed ignition switch vs voltage at the battery when the engine is at idle?

It sounds like you may have some sort of voltage drop issue thats screwing around with the ECMs calculation of final base pulse width.
Old 05-25-2019, 02:23 PM
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Car: 89 Iroc-z
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Axle/Gears: Strange 12 bolt 3.42
Re: maf car

That or a bad o2? It should be reading if heated
Old 05-25-2019, 02:36 PM
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Re: maf car

Originally Posted by Orr89RocZ
That or a bad o2? It should be reading if heated
It's just strange that it comes to life just off idle. What comes to mind is system voltage that can often be low at idle speeds if the alternator is bad. Or if theres a large voltage drop across the ignition switch which can screw around with the ECM .
Old 05-25-2019, 02:47 PM
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Re: maf car

Yeah that makes sense. Maybe get a reading at the plug at idle see what it is
Old 05-25-2019, 03:37 PM
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Re: maf car

o2 plug and the injector plugs...
Old 05-26-2019, 02:11 PM
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Re: maf car

Assume car is still in open loop. Does car have still have an AIR pump (California)? Is Air Controlled = Not Diverted and Air Switched to Port = True? This can shift O2 and WB lean by about 1-1.5 points (if available). Get it into closed loop and give the fuel trims a chance to adjust before passing judgement.
Old 05-26-2019, 03:09 PM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: maf car

Yes it has an air pump. I didnt change those settings so they should still be true. Yes its going into closed loop and still running lean, with BLM at 160 at idle.
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