A/F gauge reading incorrectly? - Page 2 - Chevelle Tech
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post #16 of 57 (permalink) Old Apr 7th, 20, 12:30 PM Thread Starter
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Re: A/F gauge reading incorrectly?

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Originally Posted by oliver69 View Post
does it move around, when you step on the gas ? or let off the gas ?

if it keeps reading rich all the time no matter what I would think the sensor went bad , this is what happened to me ... just kept reading rich all the time regardless

you can replace the sensor ,I believe 50 $ or so
ďMoves aroundĒ is a gross understatement. Itís very seldom NOT moving around. The third digit scatters so much that I wish there was a way to slow the refresh rate down. Accel/decel definitely changes things. The gauge is definitely reacting to the O2 sensor, but just seems to be reading a point or two rich all of the time.
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post #17 of 57 (permalink) Old Apr 7th, 20, 12:40 PM
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OLIVER
 
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Re: A/F gauge reading incorrectly?

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Originally Posted by any4xx View Post
ďMoves aroundĒ is a gross understatement. Itís very seldom NOT moving around. The third digit scatters so much that I wish there was a way to slow the refresh rate down. Accel/decel definitely changes things. The gauge is definitely reacting to the O2 sensor, but just seems to be reading a point or two rich all of the time.
I would call Innovate tech line and see what they say ... they might even send you a new sensor or point you in right direction at least

this is what I love about US companies , customer service ... I bought a set of used AFCO shocks from eBay , one dial was broken I called Afco to see if they had a replacement dial, they shipped it new free of charge to me.

Oliver
Milano , ITALY

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post #18 of 57 (permalink) Old Apr 7th, 20, 1:13 PM
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Re: A/F gauge reading incorrectly?

I had to change the sensor on mine last year, it was about 5 yrs. old is all.

Jim

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post #19 of 57 (permalink) Old Apr 7th, 20, 1:36 PM Thread Starter
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Tom
 
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Re: A/F gauge reading incorrectly?

Honestly, I think I am going to suck it up and buy an AEM 30-0300 and replace the whole thing. It seems to get much better reviews than the Innovate and it was on my short list when I first bought this. I think I saved about ten dollars by buying the Innovate over the AEM. Perhaps I should have followed the advice that I so freely give regarding saving a few dollars.

If it happens to read the same as my current sensor I can assume the readings are correct and go from there. I do have another project car coming and I can use the Innovate in that. But if the AEM reads where I expect it to read my issue is solved. Itís only money, right?
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post #20 of 57 (permalink) Old Apr 7th, 20, 2:17 PM
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Bill
 
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I still would pull sensor out snd clean with MAF sensor cleaner
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post #21 of 57 (permalink) Old Apr 8th, 20, 8:57 AM Thread Starter
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Re: A/F gauge reading incorrectly?

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Originally Posted by CDN SS View Post
I still would pull sensor out snd clean with MAF sensor cleaner
I do have a can of MAF cleaner. I already ordered the AEM but like I said before, I will soon have another project and having another working system will be good. My replacement should be here in a day or so and before I swap it in Iíll clean and recalibrate the sensor to see of it makes a difference. Iím going to be removing the sensor anyway so it makes sense to try this.
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post #22 of 57 (permalink) Old Apr 9th, 20, 3:21 PM Thread Starter
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Re: A/F gauge reading incorrectly?

Well Shoot. My new AF gauge showed up yesterday evening so this morning I got to work. I warmed up the car and checked the readings on the Innovate gauge. Mid-11ís to low 12ís while holding revs from 1,500 to 2,500 RPM. I pulled the sensor and cleaned it with MAF cleaner then did another free air calibration. No change. Then I hooked up the new gauge and sensor and repeated the same engine temp./RPM test. This was done within ten minutes of my first test so there were no atmospheric changes. The new AEM gauge read high-11ís to mid-12ís. So basically the same but perhaps not quite as rich a reading as the Innovate gauge.

So NOW what do I do? The AF gauge is reading properly. The car seems to run best at these rich ratios. Iíd have to go almost down to Holleyís smallest jets To even get into the mid-13ís at cruise.

Any and all suggestions are appreciated. This car has me baffled.

Tom.
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post #23 of 57 (permalink) Old Apr 9th, 20, 3:27 PM
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What is your afr at idle ??
What is your afr at Wot under load ?
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post #24 of 57 (permalink) Old Apr 9th, 20, 11:33 PM
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Re: A/F gauge reading incorrectly?

Maybe it is in a position too far down stream or too far upstream.
I have no Idea as i do not have an AFR gauge but have wondered about placement.
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post #25 of 57 (permalink) Old Apr 10th, 20, 1:07 AM
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How far from the separate pipes is the sensor?
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post #26 of 57 (permalink) Old Apr 10th, 20, 6:10 AM
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Re: A/F gauge reading incorrectly?

A friend of mine had the same problem. His headers had the socket type collectors. He found they were not completely sealing off.
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post #27 of 57 (permalink) Old Apr 10th, 20, 6:44 AM
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Re: A/F gauge reading incorrectly?

Quote:
Originally Posted by any4xx View Post
Thatís the thing: No soot or smoke anywhere. Tailpipes and spark plugs are clean.
If my plugs and tailpipes were clean and the car idled and ran great, I wouldn't touch a thing.

What are you hoping to achieve other than changing that number?

-Kevin
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post #28 of 57 (permalink) Old Apr 10th, 20, 7:23 AM
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Re: A/F gauge reading incorrectly?

Quote:
Originally Posted by Mike 70SS View Post
if you have ran any race fuel with lead in it they dont like that either.
While it does shorten the life of the sensor, I have been running the same Bosch sensor with leaded race gas for hundreds of passes and several years.

Granted that isn't cruising around with it, but 99.9% of the time I'm at the track by myself and drive to the lanes and back to the pit, loading/unloading on the trailer, lots of idling, in/out of the garage, around the block, etc.

Long story short, they don't die immediately when exposed to leaded race gas.

That being said I keep a spare one in my track box.

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post #29 of 57 (permalink) Old Apr 10th, 20, 7:35 AM
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Re: A/F gauge reading incorrectly?

Quote:
Originally Posted by CDN SS View Post
What is your afr at idle ??
What is your afr at Wot under load ?
This will provide some insight as to what is going on.

As mentioned before, sensor placement can influence readings significantly.

If the sensor is too close to one of the primary tubes you may not be getting an average reading, but instead that individual cylinder. Unfortunately, you can't completely tune individual cylinders with a carb.

Make sure you aren't introducing fuel from one of the other circuits such as accelerator pump (via vibration or pullover) etc.

Clean air bleeds?

Where are primary and secondary openings in relation to the transition slot?

Transition circuit fuel may need to be limited. What happens to AFR if you cruise at a higher engine speed?
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post #30 of 57 (permalink) Old Apr 10th, 20, 11:16 AM Thread Starter
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Re: A/F gauge reading incorrectly?

Quote:
Originally Posted by CDN SS View Post
What is your afr at idle ??
What is your afr at Wot under load ?
Hovers in the mid-12ís at idle and drops into the 10ís at WOT.
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