2 Glowing Red ExHaust Pipes Part 4-(I think I found something !)

white66coupe · May 29, 2003

Hello,

Well I decided to play with the timing last night, so I drove the car, adjusted the timing back and forth and checked the engine. No big change.

But, then I advanced the timing a bit more and backed off the curb idle on the carb (Holley 600 CFM) to bring the RPM's back down. Then I did it one more time. I advanced the timming a bit more and lowered the curb idle on the carb again to bring the RPM's back down. And guess what....I have eleminated 90% of the red glow from the back 2 exhaust pipes.

I looked at night and you had to look really close to see that they still have a "very small" glow to them.

So, I will play with the idle a bit more tonight and see if I can eleminate the glow completely.

I guess it sounds like I might have had the engine "over carbed and under timed?"....if that's possible.

Also, the torque curve seems to be stronger.

Greg.

fire power · May 30, 2003

I have been following your problem for several posts now and I know several people have sugested a vacume leak ,I know you have looked , even gone so far as to tear down and check. Hears my 2 cents look at the intake and follow the runners for the two cyl that glow, is there any vac taps on these runners? You know like a tap to trans modulator or power brake or heater controll or some line hooked in ? I have found several leeks in heater controll spagetti lines that seem so small as to not count them but they do make a difference at idle. I think maybe your looking too big for the problem . Let it idle for a while then just shut it down , let it cool and pull the plugs inspect closly for color difference between the ones that came from problem cyl and the ones that dont glow I bet the glowing ones look leaner more white. Keep looking and good luck

Frisco · May 30, 2003

I have also been following your progress. I just re-read all the previous posts concerning your glowing pipes.

What is interesting is that no one previously mentioned to check your timing and what to set it at. Glowing exhaust pipes are a sign of either/or a very lean fuel mixture or retarded timing. You evidently have stumbled on the 'fix' yourself by changing the timing. You are advancing the timing which is why you have had to lower your idle speed. Don't you have access to a timing light?

Here's what I suggest. Start your engine and bring it up to normal operating temperature. Disconnect and plug the vacuum line that goes to the vacuum cannister on your distributor. This is very important. Hook up either a dial type timing light or use a regular timing light with timing tape installed on your harmonic balancer. Bring the engine RPM up to 2500-3000. Set your timing to 34-36 degrees BTDC. Lock the distributor down. Unhook the timing light. Re-connect the vacuum hose and adjust your idle speed to what you prefer. Test drive your vehicle. If it 'pings' when under a load, back off the timing 2 degrees and road test again. Your intial timing will end up around 10-12 degrees with the vacuum hose dis-connected and plugged. What you are really interested in is your 'Total' timing. That is your initial plus the mechanical (built into the distributor) with the mechanical fully open. That is why you set the timing at the higher RPM to insure that the mechanical weights have fully extended.

[ May 30, 2003: Message edited by: Frisco ]</p>

2 Glowing Red ExHaust Pipes Part 4-(I think I found something !)

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