Thread: EFI= Extremely Frustrated Injection

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OK guys...I really need some help. I recently bought an AutoProm ALDL programmer and I am no closer to a solution than I was before I removed the "old faithful" carb.

Just yesterday I took my brother for a ride in the hotrod while he was in town for an overnight stay while he was transporting his everyday ride from the west coast to the east coast...see attaced picture. We smelled something burning and pulled over. Upon inspection, I realized the computer was in Limp-Home mode and before I knew it, the coated headers were cooked!

What is causing this? The injection is running very fat...I already knew that. So why are the coatings on these headers burning up? To say I am ready for another carb is an understatement! I thought the more fuel, the cooler the exhaust tempurature, why would the exhaust get so hot it would bake the coating?

Any ideas?

thanks, and if this isn't easily fixed, let me know if you are interested in buying a slightly used FI setup!

A really lean condition and retarded timing will give you the same results, hot headers. I have had my headers glowing red hot with my 400. The more I richened up the carb the cooler they got. On the other hand, I have heard where other guys have had really rich setups that caused similar problems. Check and make sure it isn't your timing, and make sure it isn't too lean or rich as well. What do the spark plugs look like?

a rich mixture / retarded timing will move the fire from the cyclinder to your headers. just like harleys you have to keep the fire in the cyclinder. i'm dumber than a tree stump on injection but only one thing burns headers. heat in the wrong spot. i run all my cars lean and do not burn up headers.

What fuel system setup are you running, I would have to agree with shine you have too much fuel and not enough timing. This is a easy fix with your equipment. You need know where you are on your fuel mixture throughout the rpm range, what is the O2 sensor, block learn, integrator, readings. Do you have some way to log data from the diag connector. I have been doing fuel injection for about 14 years and every system is different once you get it setup right you will never go back to carb again!
If you want send me some data and I will see if we can get it straighten out.
Terry
rosesandwrenches.com

Thanks guys for your time and wisdom.

I too thought about the timing seeing that it was the only thing that could cause the fire to happen in the headers. It was too far retarded so I advanced it.

We drove the car down to Fredricksburg this weekend and it ran much better. I stil think it needs more timing since it never pinged and it didnt have as much response as it has had in the past. So I will do that and let you know.

Terry...yes I can get the data from the Autoprom. I took out fuel from the VE tables, adjusted the idle rpm up a tad and it certainly delivered about 30% better fuel economy. So I think with a few more adjustments it should be real close. As soon as I know the timing is right I will record the data and send it too you.

Again, thanks for the assistance. I truly appreciate this website and your expertise!