Air / Fuel Gauge

[gene]

Yes the gauge connects to the O2 sensor for the TBI. I think it will
settle down when everything gets hot and I am driving down the road. I
will test tomorrow and let you know.

I think this is a valuable tool. I am very worried that I do not run the
455 too lean. Lots of bad stuff happens when you do this and here is
finally a tool that will quantify what is going on and even let you adjust
the TBI .... or the carburetor.

No longer running blind
gene

>Gene,
>
>The air / fuel gauge is really cool. Will this gauge qualify in the most
>gauges wins contest? Does it hook to the O2 sensor line or does it have a
>sensor of its own. I am interested if this gauge will begin to settle down
>once you start putting miles on and your computer learns the engine. I gotta
>get me one of these. Thanks for the info.
>
>Dave Meekhof
>73 GoBus 230
>
>In a message dated 1/14/2000 12:27:09 PM Eastern Standard Time,

>
>>
>> Date: Fri, 14 Jan 2000 04:22:58 -0800
>> From: gene
>> Subject: GMC: Air Fuel / gauge
>>
>> I have installed the air fuel/gauge from JC Whitney to monitor the
>> operation of the Howell TBI.
>>
>> So far the meter has shown how hard the computer in the Howell TBI system
>> is working. With a
>> cold engine at 2000 rpm, with the computer locked in closed loop
operation,
>> the readings are going
>> all the way from the bottom reds up through the top two yellows. The
>> lights go up and down very
>> fast showing the computer is working very hard to keep the engine at rpm.
>> The engine sounds
>> smooth but if you listen while watching the meter, it is possible to hear
>> the variation in engine
>> sounds that go with the meter readings. It is fascinating to watch the
>> computer work..
>>
>> Now off to some road tests to see if the computer has enough control to
>> keep the engine "in the
>> green" in all road conditions.
>>
>> You can read the details on my Howell page.
>>
>> gene
>> Genef -- 77PB/ore/ca
>> GMC MOTORHOME INFORMATION
>> mr.erf
>> http://www.california.com/~eagle/
>>
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/

 

[dave mumert]

Hi All
The impression I have gotten from watching (read lurking) on the EFI mailing list is that the O2
sensors do swing around a lot as the EFI adjusts the pulse width of the injectors. An analog gauge
may not show the swings as bad as the electronic LED type. Westach sells an analog fuel ratio
gauge.

See http://www.westach.com/products.htm

Dave Mumert
dave

- ----- Original Message -----
From: "gene"
To:
Sent: January 14, 2000 8:55 PM
Subject: Re: GMC: Air / Fuel Gauge

> >> the readings are going
> >> all the way from the bottom reds up through the top two yellows. The
> >> lights go up and down very

 

[gene]

Jerry wrote it up and I posted it on my Howell page. He watched the gauge
and raised the pressure to the injectors until the computer was able to
keep it in the green. I talked to Howell about this and they said the same
thing. Give it a turn to the right to raise the pressure. Then drive it a
while and see if you need more. The computer corrects as much as it can
but if the pressure is too low would not get enough fuel.

I have not done this yet but I will soon.
gene

>Gene
>How do you adjust the tbi if its is too lean.
>Gene C
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/

 

[gene]

I gave that a lot of thought, but I have a hard time when driving down the
road trying to rememeber what the readings should be on my analog meters.
I like the accuracy when I am testing, but when I am driving I even put
tape marks on my Digi-panel so I can just take a glance and know all is ok.

http://www.california.com/~eagle/chassis.html

Thanks
gene

>Hi All
>The impression I have gotten from watching (read lurking) on the EFI
mailing list is that the O2
>sensors do swing around a lot as the EFI adjusts the pulse width of the
injectors. An analog gauge
>may not show the swings as bad as the electronic LED type. Westach sells
an analog fuel ratio
>gauge.
>
>See http://www.westach.com/products.htm
>
>Dave Mumert
>dave
>
>----- Original Message -----
>From: "gene"
>To:
>Sent: January 14, 2000 8:55 PM
>Subject: Re: GMC: Air / Fuel Gauge
>
>
>> >> the readings are going
>> >> all the way from the bottom reds up through the top two yellows. The
>> >> lights go up and down very
>
>
>
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/