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Username Post: afr gauge        (Topic#366504)
blusv1 
Newbie
Posts: 10

Reg: 07-30-19
09-24-21 03:28 PM - Post#2827891    

i have a autometer digital afr guage i my 66 impala the sensor worked when i had the small block in it
now that i put my big block in it, it does its count down it goes to 14.9 and stays there. so i bought a new gauge and it does the same but stays at 15.1 . any thoughts on this...autometer never answered my question to them

thanks

TIM


 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17665
grumpyvette
Age: 73
Loc: FLORIDA USA
Reg: 03-16-01
09-24-21 03:35 PM - Post#2827892    
    In response to blusv1

http://garage.grumpysperformance.com/index.php?thr...

your autometer digital afr gauge may be ok, the oxygen sensor(s) battery voltage ,or the electrical connections or electrical grounds may be defective

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 09-24-21 03:37 PM. Reason for edit: No reason given.

 
blusv1 
Newbie
Posts: 10

Reg: 07-30-19
09-25-21 08:45 AM - Post#2827933    
    In response to grumpyvette

i replace the whole kit gauge sensor and wires and wired it to the battery...no change.

TIM


 
IgnitionMan 
Valued Contributor
Posts: 3909

Reg: 04-15-05
09-25-21 10:13 AM - Post#2827938    
    In response to blusv1

I have always used only two tuning parameters, "seat of the pants dyno", DRIVING the vehicle to tune it, and, "seat of the pants, and eyes A/F tuning" (drivng the vehicle, and pulling over and actually LOOKING at the plugs). This way, when I pass gas as I am driving, it doesn't throw my carb tuning off.



 
blusv1 
Newbie
Posts: 10

Reg: 07-30-19
09-25-21 11:46 AM - Post#2827942    
    In response to IgnitionMan

theres no issues in how it runs it runs great, plugs are spot on..i like having the info like the o pres and w temp,

TIM


 
65_Impala 
Very Senior Member
Posts: 4818

Reg: 12-29-02
09-26-21 05:50 AM - Post#2827976    
    In response to blusv1

How many wires on the O2 sensor? If it has less than 4 then the sensor needs to be grounded.



 
Mercedes 
Contributor
Posts: 356

Reg: 07-09-18
09-26-21 08:22 AM - Post#2827986    
    In response to IgnitionMan

Welcome to 1974.



 
IgnitionMan 
Valued Contributor
Posts: 3909

Reg: 04-15-05
09-26-21 10:33 AM - Post#2827993    
    In response to Mercedes

Mercedes, why are you locked into 1974, the rest of us are up to date today, and we really don't need a gauge to tell us when the engine is running properly. We learned how to do it the right way, all by ourselves, without an AFR gauge.

I am going out on a very stable limb here, and ask you if you know why there are AFR gauges today? I doubt you really do know why.

9 letter word, back from the 1974 era, that stays with us today ....... E M I S S I O N S. Factory production and EPA EMISSIONS levels jetting.

NOT PERFORMANCE, not street runner, EMISSIONS. An AFR gauge is an easy tool to use to set things like idle mixture screws, check for other jetting, timing issues, NOT as a performance, or
pre-emissions engine tuning device.

All, enjoy your delusions and fallacies.



 
blusv1 
Newbie
Posts: 10

Reg: 07-30-19
09-26-21 11:43 AM - Post#2828000    
    In response to 65_Impala

5 wire...

TIM


 
65_Impala 
Very Senior Member
Posts: 4818

Reg: 12-29-02
09-26-21 04:02 PM - Post#2828044    
    In response to blusv1

It's a wideband for sure then.

Did you check it with a propane torch?

Maybe check that there isn't a voltage difference between the exhaust and the battery?

If it won't work on the bench then I'd send it back and get a replacement.

I was recently helping my buddy tune his ~900hp turbo LS truck using a wideband. The computer would even adjust the tune itself once you setup the lambda ratio table. A wideband is a pretty nice tool to have with a performance engine. A narrowband O2 sensor isn't much good, they are mostly only to know you are running stoichiometric.




 


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