One morning it was cold...

[Il Brutto]

...and the idle in my stock '83 2.0 with a carb went high. Not high as in when you first start the engine and the choke makes the idle high till the truck warms up, high after that. I have no tach in my truck so I won't talk numbers. Idle will settle down from that initial high idle but still is higher than it was before it got really cold. Truck ran fine a week ago. Also truck misses if you are in too high a gear under load, suck as if I rev out the gears, it runs fine and smooth, too low RPM and it misses like crazy. When I am going down hill and drop a gear, that high idle just makes the truck take off and down shifting to come to a stop is a pain too, high idle so the truck dosen't want to slow down. Runs fine at 45-65 MPH just down hills and coming to a stop that high idle concerns me. I haven't got it into the shop yet to really give it a good once over but I'm thinking vac leak. Any input would be great. Has this happened to anyone else?

 

[dangerranger83]

Could be leaning out. When was the last time the fuel filter got changed or the carb cleaned out/rebuilt?

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[Il Brutto]

Fuel filter was changed 2 weeks ago. The carb is likely due for a rebuild.

 

[scotts90ranger]

sounds like a vacuum leak to me

 

[BullFrog13x4]

sounds like a vacuum leak to me to,

With the engine running take a can of starting fluid and carefully lightly spray the intake gaskets, the carb ,and carb base. If you spray part of a gasket and the rpm' s go up, then you have found your leak.

this can be done with safer sprays like wd-40, if you use a non flammable spray then the engine rpm' s will slow down when you find your leak.

it could also be a vacuum line/ hose. Maybe cracked/ or broken. I would suspect that if it is a line/ hose, then it would most likely be cracked at one end from the cold stretching it; (this would explain why it started after a cold night)

let us know what you find.

 

[Mark_88]

I'd also say probable vac leak...

I'm thinking, for some reason, a sticking throttle cable...and that's easy enough to check...just disconnect it from the carb and have someone blip the pedal so you can watch the cable travel...could be that it has a broken strand that may be sticking to the inside of the cable sheathing...or binding somewhere...not that I've ever experienced this myself...but something else to check out...

 

[Il Brutto]

Thamks guys! I'll let you know what I come up with.

 

[logman7777]

While you are poking around looking for leaks spray some wd-40 on the auto choke linkage and heat riser and make sure its not binding up..

 

[Il Brutto]

Rebuilt the carb, problem solved. Thanks guys

 

[Mikel89us]

Good to know!