S&S 3400 header pinhole from the factory.

[3400-95-Modified]

I've had issues where my open loop start up is fine but once warmed up the car will not properly idle due to many other ECU variables that I had to f-with. But as you noted with the complexity of this motor(just rechecked his build thread) there are many other things that could also be causing it yes, but I really don't think this one hole in the exhaust is enough to do that. For his sake I do hope I'm wrong though.

[SappySE107]

If it was the tune, it would be worse before close loop, don't you think? There are really only 2 variables I consider. 1, forged pistons and not enough clearance so it seizes up when its warm. 2, exhaust leaks before the O2 sensor (which is 3 inches from that bung with a hole in it).

[3400-95-Modified]

I highly doubt this is the problem with the idle... Is it just me who sees the fact that that bung is plugged and there is no O2 sensor there...

What else is done to the car? Different cam? Raised idle to compensate? Checked IAC system? checked TB Plate closing properly? Tuned VE and MAF to correct for the cam?

[blackbombshell95]

I doubt patching that pinhole will fix the idle problem. Larry

That's what I thought also but its 3 inches away from the O2 sensor. The cam will only idle in open loop.

[SappySE107]

Its right before the O2, which is going to throw off the readings. Makes sense to me that it fucks up in closed loop.

[trotterlg]

I was trying to figure out why my 95 GP won't idle when warmed up.

I doubt patching that pinhole will fix the idle problem. Larry

[Superdave]

Yep, just tack it with a MIG, clean it up well and put some high temp paint on it. I had a few small pinholes in mine and that took care of them.

[SappySE107]

Packard bell is a joke by itself:P

[pocket-rocket]

I would go with what Phil said too.

As for the RTM, that's like calling Packard Bell tech support (an old IT joke I heard).

[SappySE107]

That sounds like the best way to do it. JB weld probably won't hold up to the heat.

[onefastV6]

As it is just a pinhole, I would take a dremel and wire wheel the coating in that area. Then get a mig welder and tack a small bead on it to seal it up, which should be able to be done with the headers still in the car. Lastly get a can of VHT spray paint and a small paintbrush, spray the VHT on cardboard and dab on the VHT with the brush.

BTW: Isn't that the EGR port?

They must have been made on a Friday

[ericjon262]

I've heard that it's damn near impossible to weld up stuff like this after the coatings have been applied. good luck.

[blackbombshell95]

Return to Manufacturer.

Not likely gonna happen.

[ericjon262]

Return to Manufacturer.

[blackbombshell95]

I hope that they haven't been coated, if they are, there's not much that can be done other than JB weld or RTM.

That is ceramic coated. What is RTM?