Reading header pipes
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
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From: Vienna VA
Reading header pipes
Just curious...If you hold the throttle open to 2500 rpm and look at the header tubes after about a minute, do all your pipes glow brightly? Do the test at night in a dark area.
6 of my pipes glow brightly and two do not glow. I know I am runnning rich. Just not sure whether the glowing ones are the good cyclinders or the bad cyclinders. Can't see any difference from the plugs. I suspect that my injectors do not have matching flow rates.
[Modified by Carl90, 7:50 AM 9/11/2002]
6 of my pipes glow brightly and two do not glow. I know I am runnning rich. Just not sure whether the glowing ones are the good cyclinders or the bad cyclinders. Can't see any difference from the plugs. I suspect that my injectors do not have matching flow rates.
[Modified by Carl90, 7:50 AM 9/11/2002]
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
Likes: 0
From: Vienna VA
Re: Reading header pipes (vettmech)
Vettmech
Makes sense.
#7, which has the 02, glows. 02 readings indicate overly rich for #7, so the tubes with no glowing must be running super rich. I am confident that my plugs, wires, heads are all good, so that leaves an injector mis-match problem. I can swap a suspected good injector with a suspected bad one and see if the problem changes between the two cyclinders.
Thanks.
Carl
Makes sense.
#7, which has the 02, glows. 02 readings indicate overly rich for #7, so the tubes with no glowing must be running super rich. I am confident that my plugs, wires, heads are all good, so that leaves an injector mis-match problem. I can swap a suspected good injector with a suspected bad one and see if the problem changes between the two cyclinders.
Thanks.
Carl
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
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From: Vienna VA
Re: Reading header pipes (Nathan Plemons)
Nathan,
But the 02 indication is rich for #7 (my 02 sensor is on #7 tube), which glows. So I do not think it is a lean condition that is causing some of the exhaust ports to glow. I checked timing and it is fine. If the problem was timing, I'd expect all cylinders to be affected equally. There is an imbalance in exhaust temps, which to me points to a fuel issue, given that I am confident that plug, wires, valve adjustment, and valves condition are fine.
I would expect some degree of glowing to be normal. But you won't see it in lighted conditions.
You probably have a well tuned car. I'd be interested to see if your headers glow after a minute of holding the throttle open with your hand to 2500 rpm. Try it at night in a real dark area.
Carl
But the 02 indication is rich for #7 (my 02 sensor is on #7 tube), which glows. So I do not think it is a lean condition that is causing some of the exhaust ports to glow. I checked timing and it is fine. If the problem was timing, I'd expect all cylinders to be affected equally. There is an imbalance in exhaust temps, which to me points to a fuel issue, given that I am confident that plug, wires, valve adjustment, and valves condition are fine.
I would expect some degree of glowing to be normal. But you won't see it in lighted conditions.
You probably have a well tuned car. I'd be interested to see if your headers glow after a minute of holding the throttle open with your hand to 2500 rpm. Try it at night in a real dark area.
Carl
