too rich!!!
too rich!!!
Freshman User
Joined: Aug 2004
Posts: 25
Likes: 0
sounds like the float might be sticking or saturated to the point its to low and flooding it out. You also might have a worn needle or seat on the float system. I think your runnin a 1 bbl cater. there pretty basic to rebuild ans set up. There arent really adjustments that would make that much difference
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
There is a mixture screw on the carb on the right side of the truck. Close to the hight and on the same side as the EGR valve. It may have a tamper proof cap that will have to be removed. turn it to the right to lean, turn it to the left to richen. I assume your 1985 has a feedback carb so...
It's very hard to adjust feedback carbs without the proper tools, (the computer is trying to adjust the mixture as you adjust.) but below will give you a really close aprox of where the mixture should be and has been very successful for me.
Turn the screw in leaner until the truck starts to run poor and starts to miss, then turn it to the left until it idles good. Take out for a road test, then Turn the mixture screw 1/4 turn leaner then road test. If truck runs better turn it 1/4 a turn and road test each time until the truck starts to run worse then back a 1/4 turn. If the truck runs worse at the start, turn it the opposite way, 1/4 turns and road test until it runs good. (or the best it can).
But before I'd adjust anything I'd do some checking of other components/adjustments first:
I'm more concerned in why the trucks running rich. Does the truck have a oxygen sensor? If it has and it's been a long time since you changed it, I'd replace the O2 sensor first before adjusting the Carb. A bad O2 sensor can make the truck with a feedback carb run very rich.
Doing a tune up could help too. Plugs, cap, rotor, airfilter, gasfilter, etc... Especially airfilter.
Check the timing. Pull codes from the computer if you have one...
If the timing is off check the ignition module... have it tested at a local auto parts store such as autozone, it's free of charge. If it checks out ok, adjust the timing.
It could even be the carberator itself. The feedback solonoid on the carb, does it "tick" when you have the ignition on? If not it needs to be replaced, or the wires need to be fixed etc. (if you have one).
It's also possible if the truck is all original that the carb has vibarated loose over time. There are four screws underneath the carb that have a tendency to back out due to viberation. Try wiggleing the carb around on the engine. If any movement from the carb, you need to take it off and tighten the screws underneath, and/or rebuild it. I have used a threadlocker, (the blue stuff that don't permanetly bond) to keep these screws from backing out again.
I hope this helps,
It's very hard to adjust feedback carbs without the proper tools, (the computer is trying to adjust the mixture as you adjust.) but below will give you a really close aprox of where the mixture should be and has been very successful for me.
Turn the screw in leaner until the truck starts to run poor and starts to miss, then turn it to the left until it idles good. Take out for a road test, then Turn the mixture screw 1/4 turn leaner then road test. If truck runs better turn it 1/4 a turn and road test each time until the truck starts to run worse then back a 1/4 turn. If the truck runs worse at the start, turn it the opposite way, 1/4 turns and road test until it runs good. (or the best it can).
But before I'd adjust anything I'd do some checking of other components/adjustments first:
I'm more concerned in why the trucks running rich. Does the truck have a oxygen sensor? If it has and it's been a long time since you changed it, I'd replace the O2 sensor first before adjusting the Carb. A bad O2 sensor can make the truck with a feedback carb run very rich.
Doing a tune up could help too. Plugs, cap, rotor, airfilter, gasfilter, etc... Especially airfilter.
Check the timing. Pull codes from the computer if you have one...
If the timing is off check the ignition module... have it tested at a local auto parts store such as autozone, it's free of charge. If it checks out ok, adjust the timing.
It could even be the carberator itself. The feedback solonoid on the carb, does it "tick" when you have the ignition on? If not it needs to be replaced, or the wires need to be fixed etc. (if you have one).
It's also possible if the truck is all original that the carb has vibarated loose over time. There are four screws underneath the carb that have a tendency to back out due to viberation. Try wiggleing the carb around on the engine. If any movement from the carb, you need to take it off and tighten the screws underneath, and/or rebuild it. I have used a threadlocker, (the blue stuff that don't permanetly bond) to keep these screws from backing out again.
I hope this helps,
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