Question about 1993 Ford F350

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My truck sits still, runs good. if i rev it up it will start to smoke,a little than real heavey. if i drive it , as i speed up it sounds like its loading up then it will rev up on its own real high an

Smokes a little at first, the more i rev it the more smokes. sounds like it is loading up. when i drive it and i get under a load it revs up real high and smokes like hell . please help

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  • Ford Master
  • 5,501 Answers

Having to guess whether this is a gasoline or diesel motor and it would help to know if smoke was white, blue, or black as each is a discharge of either water, oil, or gasoline or diesel fuel.
The high revving is an indicator of your main problem. Something is being drawn into the cylinders and the rate and volume are not being regulated. At idle, a slow draw is producing minimum smoke. Then the problem gets worse as you increase RPM to drive the truck.
If this is a carbureted gasoline engine, check the power valve in the carburetor for rupture. If this is an injected gas engine, the TPS switch may be causing the flooding. Also for carbureted engines, the gasohol fuels eat up the rubber parts inside the carburetor and make the gaskets swell. Older carburetors need rebuilding with alcohol resistant gaskets and components.
Another possibility is a fuel pressure regulator for the injected models. Also try unplugging vacuum lines and observing if transmission fluid or other substances are inside the vacuum lines.
Each generation of Onboard computer has different capabilities. Yours is several generations old. But there are a few problems your system could report. That would mean that the monitored systems are not the problem.
You might want to remove a sparkplug and see how it is firing and what type of deposit might be on the electrode.
If your engine still has a vacuum advance on the distributor, check the vacuum pod. Trucks were built "old-style" as pollution laws differed for cars and trucks and some trucks were even exempt by weight class.
Would like to know the end result of your case.

Posted on Jul 12, 2013

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Posted on Jan 02, 2017

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SOURCE: Intermittent high revving!

Throttle position sensor.

Posted on Jun 27, 2008

  • 416 Answers

SOURCE: my truck blows white smoke

Hello!
There are two differnt reasons for black and white smoke coming from the tail pipe.
Black smoke means fuel runs rich (car getting to much gas). Check fuel pressure/air filter.
In some cases the white smoke means car is burning oil or transmittion fluid. Have tem checked/replaced.
If you can feel a smelly smoke it can be catalytic converter.
In a worsest scenario if car blowing white smoke it can be engine coolant is getting into an engine cylinder from a bad head gasket ,or a warped/cracked head. So you need to keep your eye on coolant level and check your engine for overheat. Also might be good to check your oil for traces of coolant (on a dipstick it would be a milky substance mixture of oil and coolant).
Good Luck

Posted on Dec 07, 2008

Robert R
  • 7 Answers

SOURCE: 2004 Ford F-350 6.0 Turbo Diesel - Severe Hesitation at Take Off

Some of these engines have a place to drain water out of the fuel system.. Some fords actually have a stick under the hood that you push or pull That opens a valve on a water collection bowl. It's not labeled usually. It might state where it is in the owners manual under fuel water drainage or something similar.. if that bowl is full it will cause hesitation... If it gets over full it will cause runability problems. Another possibility since you said it's black smoke is one of your injectors is sticking at low rpms and squirting raw fuel into the cylinder till the rpms get up enough to burn that fuel off completely then then the injector works a little better.... Do you notice any missing... Feel something under the hood like the air cleaner housing and make sure the vibration is constant and doesn't have a small sudden shake and the n smoothe... And then a small sudden shake again.
If it does have this shake you can trouble shoot which injectors by with the engine running loosening an injector line and seeing if the engine runs worse or not.. If it runs worse tighten it up and move to the next line till you unscrew one and feel and hear no difference... When you find that one that's the injector with the problem.

Posted on Apr 22, 2009

  • 5 Answers

SOURCE: Ford F-350 6.0 Turbo Diesel - Severe Hesitation at Take Off

sometimes when the motors under enought pressure it will black smoke..so mabe the transmission is hanging up or something in first gear,,,i can rev my truck up all day and it wont black smoke when these a sever load o it and i hammer down it putts a bind on the motor and fuel is steadly being pump into the motor causing unburn fuel witch is black smoke..so maybe you want to go check the transmission or the fuel PUMP not the filters

Posted on May 17, 2009

  • 180 Answers

SOURCE: White smoke

these engines are pron to injector failure !!! white smoke means dumping fuel ! black smoke means lack of air ! blue means burning oil! its not an easy task! by all means not cheap! ull need 7 injectors and one #8 injector call a ford dealer to see the price ! but i would also call an international aka navistar dealer! there sometimes cheaper

Posted on Mar 19, 2010

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