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01-02-2003, 08:57 PM | #1 |
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Join Date: Oct 2002
Location: where it's hot
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need some tech help
took one of my trucks for emmissions today ( its either a 230 or a 250 6 CLY ) and it passed every thing except the idle test . here are the readings.
(HC) in PPM idle standard 250 Actual reading 885 ( FAIL ) (CO) in % idle standard 2.00 Actual reading 5.88 ( FAIL ) (HC ) in PPM loaded standard 250 Actual reading 124 ( PASS) (CO ) in % loaded standard 1.50 Actual reading .57 ( PASS) Is this just the wrong idle adjustment on the one barrel carb or do the figures indicate some thing more involved . Also during the test we did not know the thermostat had become stuck and by the time the test was done the truck had over heated real bad , could too hot an engine cause that bad idle reading ?? It turned out to be a real sh***y day , on the way back the truck was over heating so bad , we wound up pushing the truck the last 2 blocks just to get home . Thanks for your help . |
01-02-2003, 09:09 PM | #2 |
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Join Date: May 2002
Location: Winnipeg, Manitoba, Canada
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ahhhh thats no good! Not sure about your actual questions but before you go back again try some of those carb cleaners and emissions passing chemicals.
Just a thought!
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01-03-2003, 01:04 AM | #3 |
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ttt
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01-03-2003, 03:44 AM | #4 |
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Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,721
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I believe your idle mixture settings are to rich, time and adjust carb with a vaccum guage and tune it up with new plugs, wires, cap, & rotor or switch to HEI distributor. I give step by step instructions on the following page of our site
http://www.gmcpauls.com/Tech%20Tips1.htm You will want the section " Vacuum Gauge Use " Between doing that and Before returning get the overheating solved thats really hard on a 6cyl motor running it till it won't run, VERY easy to crack the head on them by the thermostat, install a new thermostat, and a fan shroud if yours is missing, add a mixture of 50/50 anti-freeze and water not all water even if you live where it never freezes as anti-freeze helps it to run cooler also. GMCPaul |
01-03-2003, 11:11 AM | #5 |
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THANKS
GMC Paul , thanks for the tech input and I will follow your advice and then see if I can get it passed . The overheating problem has been solved , has it turned out the guy I had just bought the truck from had dropped a ton of the older type radiator sealing pellets into the cooling system and had every thing from the thermostat to the heater hoses pluged up , what a mess . I hope I did not damage the motor , it did get so hot it was starting to detoniate before I was able to shut it down for good .
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