For the last 2 vehicles I had tested I got most the #'s to drop by almost
1/2 by using "Guaranteed to Pass" as instructed. Made sure that I included 1
good trip on the highway (at least 45 min). Changed the oil and filter and
changed the air filter. Then filled up with a good gas and brought the
vehicle in for testing at operating temp.. The change in numbers was
DotSeaEh is .ca
| > What are the factors that determine HC output at the tailpipe from the
| > V6 (Vulcan)? I have this engine in an Aerostar 5 speed, and barely
| > emission. It failed at 1.65 ppm (allowable 1.60). But the plugs were > 4
| > years old. I changed the plugs to Bosch +2s, changed PCV valve, O2
| > and the air filter. The dist cap and rotor are < 1 year old. I put in
| > fresh synthetic blend oil (just for good luck) and ran through 1 tankful
| > of gas with "Outlaw" fuel injector cleaner. It was pinging only on
| > heavy acceleration (pedal all the way down) as opposed to every
| > on-ramp, and the engine had quietened down considerably compared to
| > before. Possibly it had better acceleration too. Then I put in
| > another tankful of gas with Chevron Techron injector cleaner, but time
| > running out, so only about 80 miles into that tank, I filled it up
| > gave it a 30 min whirl on the highway and took it in. They tested it
| > away, and it got... 1.59 ppm.
| > I can't understand what else I can do...
| > - cat?
| > - Was the Techron making it run rich?
| If your talkin HC's its probably 165, If your talkin CO its probably 1.65%
| 165 ppm HC is not bad, just a little high. If your talkin CO % that is on
| the high side for a newer vehicle.... A cat would take care of both most
| likely. New plugs would help the HC.
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