The guy you need to talk to is PA_JERO, you've got his number. He's put more carby 2.6's through emissions than anyone using both Mikuni and Weber carbs. I wish i could help you but i just passed emissions at 2.1% opacity of 20% allowable in my 2 door 4 cyl <img src="/forums/images/graemlins/smile.gif" alt="" />
Good point. The spare dizzy I've got came from him, actually. Borrowed a timing light yesterday and will be swapping in the dizzy without frayed wires just in case.
I'll keep you in mind when it comes time to smog test the Delica. <img src="/forums/images/graemlins/evil.gif" alt="" />
It should be a pretty easy thing to change the CAT for a new one, also how old in the O2 sensor, they are a wear item, like spark plugs. Also, I think there is a small lead plug at the base of the carb covering an adjuster screw to lean out the air/fuel mixture a bit. Alcohol in the gas tank helps NOX, but might help out on CO a little as well. (I've used the HEAT product found at many chain auto part stores)
-Jon
Hey Jon. Keith and I removed the old O2 last weekend. Had to go a little barbarian on it. Truck starts faster, idles smoother, accelerates more crisply, but the O2 was only good for an 8% improvement over the last test. Still need about a 15% improvement just to scrape by.
I'll look into the HEAT product.
A quick and easy test to see if your converter is functioning properly is to measure the temps of the pipes at the inlet and outlet of the cat - if it's working properly the outlet temp will be higher than the inlet. No change means you need a new cat.
+10 on what RyanY said. It sounds like you need a new cat, but check with a digital infrared thermo.
John B.
I'm going to drive up to the shop this weekend to shoot it with the laser and see. Thanks, guys.
Fingers crossed. At least, with a problem like this, fixing it doesn't just mean I make a government agency happy. It means I'm reducing my truck's impact on the environment - and getting more miles per gallon! <img src="/forums/images/graemlins/kewl.gif" alt="" />
