Question about 1986 Ford F 250

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460 hard cranking after warm

After reaching normal op. temp. engine becomes very sluggish at start almost like its vapor locking. can the timing be causing this? if so how bad is it off to cause this.

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First thing you should do it take it to a Ford dealership and tell them of your lack of power concern. They have been known to have fuel pump problems, low fuel presure causing lack of power. There may be an extended coverage recall on your vehicle that you cover the replacement of the fuel pump.

Posted on Jun 23, 2008

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Posted on Jan 02, 2017

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Vapor lock occurs when the gas in a fuel line turns from liquid to vapor, before it reaches the engine. The first signs of vapor lock are normally when your engine begins to run roughly. The engine may sputter and hesitate. It will then stall completely and refuse to restart. It may seem like the car is out of gas or the fuel pump has failed. While these are possibilities, vapor lock may be the problem.

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98 and 99 intrepid was manufactured with weak fuel pumps causing them to vapor lock try pouring cool water on the fuel rails on the intake to calm vapored gas then try to start it. Even the temp gauge at half way mark is probably still low on coolant causing engine to be warmer than normal causing the vapor lock to fix this problem replace the fuel pump with a 2000 or newer intrepid fuel pump that carries a little higher psi to prevent vapor lock from reoccurring this pump is compatible with your 98 it will plug right in

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Hey Dennis,, DON"T BECOME A PARTS REPLACER..(some people who "call themselves mechanic's" are just that!),.. .take this Dodge to a qualified professional... talk to them..
You say warm... do you mean full running temp?? .if so, you may be experiencing a vapor lock,, fuel "boils" when the engine is hot.. when it cools its no longer hot enough to cause this..(S.W.A.G.)

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99 rodeo starts hard after is has been warmed up. Starts fine after it has been sitting overnight. Almost starts like it is flooded. Have changed O2 sensors, coolant temp sensor. Cleaned IAC


Hello, I usually work on Ford family Brands. There are sometimes 2 temperature sensors on engines. One is meant for the dash gauge alone and the other is for the Engine management systems.

You could have one of several problems. A starter can sometimes fail becauseof heat. You would need to do a draw test when the motor has been run to duplicate your problem. Autozone, Advance, and Oreillys are some of the free test places.

The cold start cycle is like an Electronic choke. If the temperature info is not reaching the Engine management controls then the vehicle will always be set for a cold start.

Lean conditions also can lock an engine. In order to get good mileage the Camshaft timing is advanced. If the engine has worn timing parts, the firing may advance beyond specs. You may be fighting compression and experiencing vapor lock. Try going up a Grade in gas Octane.

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Some times the fuel line may be too close to the exhaust manifold or engine and can create a condition called vapor lock. This is where the fuel is heated to a vapor in the fuel line. This is easily corrected by just moving the fuel line away from the source of the heat.

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