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Username Post: E-Street EFI, AFR Going Crazy        (Topic#352053)
Posts: 108
Loc: Ormond Beach, Fl
Reg: 08-23-08
07-16-18 01:33 PM - Post#2740181    

Howdy all
I can no longer wait for customer service to call back I need to get to work tomorrow. I developed an issue when letting off the gas pedal, coming to a stop sign, and, putting it in park. It sounds like a vacuum issue the way the engine goes up and down the AFR gauge go up and down and I thick one even gauge glowed red.  The fuel psi is good, no vacuum leaks, works good at cruse and acceleration. Sense this system doesn't give error codes to the tablet. I thought it would before I bought it. How would I diagnosis it ? 


Posts: 130
Age: 37
Loc: Millersburg,Ohio
Reg: 01-02-12
07-16-18 03:08 PM - Post#2740191    
    In response to freebirdinflyt

Does that system control the idle speed by the way Of an iac valve? If so, the butterflies may closed too far. I mess with megasquirt efi a little and I set the throttle butterflies about 100rpm below what I set the ecm to idle at with the iac valve closed.

1950 Styleline Deluxe 2-door sedan..
348 tripower/NP833 4-Speed/3.73
1950 Styleline Deluxe 4-door..
Vortec 4200 I-6/4l60e/3.42/current project car
1956 Cadillac Coupe de Ville 500 efi/4l80e
1987 GMC R1500 Sierra Classic
454 tbi/700r4/3.42

Posts: 108
Loc: Ormond Beach, Fl
Reg: 08-23-08
07-16-18 03:40 PM - Post#2740193    
    In response to kzhurley

Hey Guy

Thanks for the reply
The system only has 8000 mile, so, I don't think the butter fly change much from stock, but, going to put that into my notes. The Edlebrock tech called back and said to jiggle the wire harness to see if it happen at any other time. plus he believe the AFR (corr) is all over the place because the exhaust sensor is picking up a leak some where in the hole exhaust when I let off the gas pedal. He never mention a bad sensor. Soooooooooo I have an idea of whats happening but still a big hmmmmmmmmmmm. LOL
Thanks again

Very Senior Member
Posts: 4594

Reg: 12-29-02
07-17-18 07:39 AM - Post#2740264    
    In response to freebirdinflyt

There is an idle tuning/Calibrate TPS menu in the advance tuning. Try that.

Self-Learn Idle Tuning

If idle quality is not performing as expected, some adjustment to the idle setup may help. All adjustments should be performed at operating temperature only (170° F).

• If idle quality is excessively poor, first try resetting the self-learn from the ECU Settings page.
• Verify the idle setup procedure has been followed as outlined in the installation instructions.

Verify the Idle Speed Target is 50 RPM less than the idle screw settings on the throttle body. This can be verified by simply covering the dime-size hole on the top of the throttle body, this will close off the air to the IAC valve, the engine idle RPM should drop 50 RPM.

• Verify the idle speed screws on the throttle body shafts have been adjusted equally, so the front and rear butterflies are allowing equal air flow at idle. Some engine combinations may idle better with a stagger in the screw adjustment that allows slightly more air flow past the rear butterflies then front or vice versa.

• The self-learn may require the idle speed be increased slowly above the desired idle speed for a few moments to adjust fuel calibration, this can be achieved by increasing the idle target in the Advance Tuning section. Increase the idle target to 1500 RPM in slow steps, observe the AFR Corr % allowing time for adjustment. When complete, return the setpoint to the desired Idle Speed Target.

Posts: 108
Loc: Ormond Beach, Fl
Reg: 08-23-08
07-31-18 07:36 PM - Post#2741643    
    In response to 65_Impala

Thanks for all the info guy. I need to for sure play more on the tablet when I get the newest downloads.

I installed a new Bosch 17025 Oxygen Sensor exact fit and has fixed the problem plus and leaks after the sensors.


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