| Howell Fuel injection [message #200484] |
Sun, 03 March 2013 13:31  |
docsdad
Messages: 32
Registered: May 2008
Karma: 0
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Member |
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I installed Howell fuel injection a few years ago. This winter when I went out and started it during the cold weather, note here in GA that is not very often. It will start up immediately and run at 1500 rpm, then it will periodically drop in rpm down to 500 rpm or less then back up to 1000 and then maybe back to 1500, This was not my experience with it in the past. I used to have the idle rpm set at 750, and it used to run like a dream. When i discussed problem with Howell, they suggested that I open throttle idle screw up to get more air flow. I did this to achieve 1200, and it helped some for a while, then it started again so I upped to 1500. Note when it goes into drive it drops to 750 to 800. When running at idle, it varies 50 rpm up and down, and now when I start, it takes several revolutions before it starts, It used to start instantly. Any suggestions as to what I need to check or adjust. I was concerned it might be old gas, and I went out and got 10 gallons of new gas to try and improve it. Could not see any change. I welcome any thoughts you might have on the subject.
James T in GA
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| Re: [GMCnet] Howell Fuel injection [message #200487 is a reply to message #200484] |
Sun, 03 March 2013 13:53  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Sounds to me like faulty O2 sensor readings. Could be caused by leaks in
exhaust manifold or headers upstream from the 02 sensor, or by bad sensor.
That stuff does NOT LIKE to sit idle without running. Another problem
could be temperature sensor. Have someone with an OBD 1 READER download the
data and see what is up. I have had an erratic idle caused by both of those
issues. My advice would NOT be to further open the throttle plates. That
confuses the Idle Air circuit.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Mar 3, 2013 11:32 AM, "James Thompson" <tjamessherry@bellsouth.net>
wrote:
>
>
> I installed Howell fuel injection a few years ago. This winter when I
> went out and started it during the cold weather, note here in GA that is
> not very often. It will start up immediately and run at 1500 rpm, then it
> will periodically drop in rpm down to 500 rpm or less then back up to 1000
> and then maybe back to 1500, This was not my experience with it in the
> past. I used to have the idle rpm set at 750, and it used to run like a
> dream. When i discussed problem with Howell, they suggested that I open
> throttle idle screw up to get more air flow. I did this to achieve 1200,
> and it helped some for a while, then it started again so I upped to 1500.
> Note when it goes into drive it drops to 750 to 800. When running at
> idle, it varies 50 rpm up and down, and now when I start, it takes several
> revolutions before it starts, It used to start instantly. Any suggestions
> as to what I need to check or adjust. I was concerned it might be old gas,
> and I went out and got 10 gallons
> of new gas to try and improve it. Could not see any change. I welcome
> any thoughts you might have on the subject.
>
> James T in GA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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