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Open Headers with TBI

First of all, I also agree that you need to take some time diagnosing the problem before throwing parts on it. The factory manuals are generally the best, but I have also found the typical Chilton's or Hayne's to have decent basic troubleshooting guides that are easy to follow.

With that said, I wouldn't be surprised if the combination of the open headers and O2 sensor location have something to do with it..........though I definitely would NOT suggest just wiring in a heated O2 sensor to see what happens...........
 
What I will be doing this weekend, is putting some extensions and turnouts on the exhast, I will check the timing fist off and then I want to check fuel pressure. Hopefully this will get it close enough that I can atleast run in next weekends mudbogs.
 
Jeromy Gibson said:
Could this be why my engine is running bad? would putting on some header extensions help?
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That's not why your engine is running bad.

Sounds more like a vacuum leak or low fuel pressure.

Check codes, check fuel pressure. What are you using for a fuel pump?

If you are running the EFI distributor there is no mechanical advance.
 
dyeager535 said:
Huh. My truck doesn't seem to have a problem with a one wire, exhaust being fed from only 4 cylinders, and being located behind the collector. Another expensive part to be throwing at a problem.
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not saying that is the problem but i have been told by a vary well known t.b.i. swap shop that sells all these kits and parts for stand alone use. that the o2 needs to reach a set temp and it wont reach it proporly that far down the system. thats why the factory used them so close to the head and thay use heated when thay are that far down the system.
 
sweetk30 said:
not saying that is the problem but i have been told by a vary well known t.b.i. swap shop that sells all these kits and parts for stand alone use. that the o2 needs to reach a set temp and it wont reach it proporly that far down the system. thats why the factory used them so close to the head and thay use heated when thay are that far down the system.
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Not only that, but with the O2S right there at the end of the collector, its gonna be seeing a bunch of air, thinking its lean and making it run SUPER rich. Unless I totally missed somethign, I think this is kind of a silly quetion.
 
Not much air going in an EXHAUST pipe! :D

Back to the problem, it's not because of where the O2 sensor is, if you don't believe me disconnect it! You'll still have the problem.
 
84_Chevy_K10 said:
I don't believe TBI uses a mechanical advance distributor.
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I have to agree with Timmy here. No EFI system uses a vacuum or mechanical weight distributor. This is why you need to disconnect the EST wire before setting base timing, then the computer takes over from there once the EST wire is reconnected.
 
Very good chance that the knock sensor is picking up the loud report from the open headers and shutting down the dizzy at higher rpms. A buddy of mine had a newer pickup that had a very bad leak at the flange that caused this same problem. After trowing lots of parts and $ at it he finaly asked for some help and I told him I would look at it after he got his leak fixed so I could hear what was going on in the engine bay. He replaced the flange gasket and presto it was fixed! Killed two birds with one dougnut!

Aaron
 
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