Well after arguing myself blue with a 'mechanic' that says no way a Jeep with a carb can pass emissions in California if you disable the emissions computer or do a 'Nutter' on it after the first guy I think to put the directions online:
The mechanic's reasoning is the NOx will blow out or the timing will have to be too far back to pass.
The Jeep numbers for an 89 YJ 4.2 in California are 875 NOx on the ASM
2525 test I was told.I found my 2003 ASM 2525 emissions papers for my Canadian 1986 CJ7 that I disabled the computer in.
Specs.
- 1986 Canadian CJ7 4.2L, Likely 60,000 original miles on it.
- 'No' Catalytic converter (not needed in Canada)
- 2" straight pipe with a high flow Dynomax turbo muffler.
- No computer, 'Nuttered'
- Base timing set at 9 deg BTDC with the vacuum line off like the book says for a non computer engine. (If I go with the higher RPM setting of full advance the sticker on a YJ says, I end up with 6 or 7 deg. BTDC base and I find that too boggy for power so I even have room to play there.)
- 92 octane ESSO gas.
- Ported on the timing advance
- Stock BBD carb set to 'best lean idle' and always a fresh $20.00 rebuild kit for the test.
- Accel Supercoil for hot spark with Champion plugs and OEM wires.
- Strong pull up to 4400 rpm, then falls flat.
- 11L/100km or something like 23 US mpg highway
On the ASM 2525 test I got 589 NOx!!!!!.
And 16 ppm HC
And 0.11% CO
Photo of the papers here:
Not a fluke, I killed the computer in 2000, this 2003 one was just the only year they actually put the NOx reading on because I don't have to pass that.
And the best part is I have passed the last test it ever will need! It becomes too old before the next one.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's