'84 GMC Jimmy, 2.8L 2bbl, W/ EGR and AIR and CAT

Engine came from an '87 MPFI Camaro

Emissions:

HC
Cruise limit: 200, Emits: 245

HC
Idle Limit: 220, Emits: 391

CO
Cruise Limit: 1.5, Emits:5.04

CO
Idle Limit: 1.2, Emits: 6.7

CO+C02
Cruise Limit: 6, Emits: 17.34

CO+C02
Idle Limit: 6, Emits 17.6

Idle RPM 870, Cruise RPM 2120, Engine Temp 185deg F

Parts new: Plugs, Coil, Cap, Rotor, Engine has 65k.
Parts Checked: Cat(no rattle, 300Deg before, 400after)

HELP?! This is a BAD failure.....

 

I was also running some Berryman's Emissions Stuff and it failed with that. Drove it for about 100miles+ then took it through emissions.

 

that berrymans is crap, I didn't have anyimprovement when I used it . When was tha tlast time the carb was rebuilt/serviced, and how's the timing?

 

I played with the idle screw a little, no clue when it was last rebuilt... though the engine seems to run fine.. just not clean.

Timing is good, although I don't know if I'm getting any Vac Advance.... No vacuum coming from the line when I rev... though this is all at a stand still I guess with the two vacuum valve things up front that might change? I have the timing at 7deg... book calls for 6.

 

I know V8 guys who retard the timing and cerate a hidden vacuum leak to pass.

Matt

 

Try replacing the O2 sensor. My IROC failed last week, so I had a new O2 sensor installed, and it passed no problem. In fact, with the new sensor, the car is running cleaner than my 2000 Grand Am!

 

No computer on this guy, no O2 sensor.

 

New Plug wires/hotter Thermostat/change of oil/Tried to lean it out with the mixture screw now I have:

HC
Cruise limit: 200, Emits: 135 PASS!

HC
Idle Limit: 220, Emits: 567 FAILED WORSE

CO
Cruise Limit: 1.5, Emits:4.4 FAILED NOT AS BAD

CO
Idle Limit: 1.2, Emits: .04 PASSED!

CO+C02
Cruise Limit: 6, Emits: 17.1, Came out less, not a pass/fail

CO+C02
Idle Limit: 6, Emits 12.14, Came out less, not a pass/fail


Idle RPM 790, Cruise RPM2570, Engine Temp 215deg F


What now?

 

maybe try some kind of additive...I remember people talking about this "Gauranteed to pass" stuff (name says it all) I also remember somebody saying Bacardi 151 will do the trick