87 YJ 4.2L running rich... needs to be smogged

[HozayKwarvo]

Looking for ideas/experience here. It's a 4.2l and we did the Howell TBI conversion as well as updating the ignition to HEI. New plugs, wires, etc. The thing runs like a striped-ass-ape now but it's no where near passing smog :banghead:  waaaaay tooo rich. Tried to smog and failed as a gross polluter.

The TBI doesn't have an adjustment for air/fuel. I'm reading up on possibilities like the fuel return line being plugged, too much pressure from the pump, bad map sensor.... any other ideas?  

 

[Realbadlarry]

Arizona registration... my bil's  yj needs new cats every two years...cool thing is they are under warranty....

 

[Kraut_n_Rice]

Arizona registration... my bil's  yj needs new cats every two years...cool thing is they are under warranty....

Depending on where, it would still need an emissions test..

 

[Kevin]

have you talked to howell about it?

 

[Sausage450r]

Friend did same thing you did and lived with the same problem. The problem only got worse to the point it would flood out at times after shutting it off sometimes. My guess would be fuel pressure regulation or electrical input range to injector itself. He ended up fixing it by swapping in an ls1 instead (we dont smog  here)

 

[HozayKwarvo]

have you talked to howell about it?

Not yet, they are on the list of things to do :coocoo:

 

[Grease Monkey]

Hozay 

You need to know what the vacuum is and what your initial timing is. I would set it at 8*btdc with the vacuum line disconnected and plugged at the TB. 

Low vacuum will  tell the map sensor that the engine is under load and push more fuel. You should be reading around 20 inch of vacuum at idle. 

That TB may have two vacuum ports one above and one below the throttle blade. You want to be connected to manifold vacuum. And nothing else connected to that line.