9 replies to this topic

[Rod]

I have an 85 F150 with a straight 6. A few weeks ago I had the carb replaced because it idled rough and kept dieing. It was the original carb and time to be replaced. Anyways, now when I start the truck, it fires up fine and idles great.

If I slowly press the gas, it revs up no problem. However, if I step on the gas quickly to give it a rev, the engine completely cuts out, and when I get off the gas, it goes back to an idle.

Could this just be an adjustment with the carberator? Would like to fix it myself rather than brining it in.

Thanks!
Rod

[Rod]

Or could it be a fuel filter issue or timing...?

[beyond the band]

Are you drunk now? CARBERATOR? BRINING?

[Devil Doc]

Carberators are old school, Rod, and that particular carb is touchy as hell. It probably just needs an adjustment. But, that's the problem...finding someone that knows how. Most of those guys are dead, retired or work for NASCAR. In the olden days, one wouldn't have replaced the carb. He would have had it re-built, but not anymore.

Doc

Edited by Devil Doc, 09 May 2012 - 06:32 AM.

[Vicster]

It's an adjustment(s), sounds like the accelerator pump was not set up properly.

[grateful1]

It's an adjustment(s), sounds like the accelerator pump was not set up properly.

This would be the plave to start.

Depending on the model, it could be as simple as having an incorrect 'spring'.

[ironpeddler]

The jets could be too big causing it to flood on a quick acceleration....do you get a gas smell under the hood when pressing the gas pedal hard and it stalls? Take off the air cleaner, start it up and make it stall a few times and see if you have gas residue in the throat or you get an intense gas smell..

Could be a bad throttle spring (although rare) or the accelerator pump (probably the cause coupled with the jets) causing the flooding...fuel filter (which you should change anyway because it's cheap) would only cause this if it was starving the motor of gas, that's why you have to check for the gas odor. If you replace the filter, check the direction arrows for proper installation.

If this is a re-man carb, could be the diaphragm in the fuel pump...it may have been perforated (or installed improperly) during the rebuild. Chances are the pump just needs to be properly adjusted to match your particular vehicle....most of the time these parts are put out there to cover a very wide range of vehicles and will need proper adjusting once installed on yours.

Also, check the plug in cylinder 1...see if it's wet or dry with some sort of white particles on it....that may tell you the direction to go in also. Wet/shiny/smells like unburnt fuel = too much gas...Dry/whitish/no odor = too little gas.

Good luck.

[Rod]

Great feedback, thanks guys. I'll let you know what I find out.

[mmburtch]

When they stopped putting carberators on cars, I stopped working on them myself.




Really sad that my spellchecker doesn't have carberator in it.

[tone-ny]

All good points I would also check into the vacum line/hose to the carb.Had a 63 Merc with the straight six and the carb was really easy to rebuild. With fuel injection we lost out on working on cars, about the only thing you can do now a days is change oil, filters and and wipers.