Drove my truck hard the other day to west Texas to make a delivery and experienced
something very strange. The truck went into high idle when I arrived at my destination.
When I put it in park the high idle went up to about a thousand RPM. It stayed like that until I turned the motor off and turned it back on later. It was 103 degrees outside And the cylinder head temperature was 221 degrees. Is this normal? Does the engine automatically idle up when it gets very hot outside or the cylinder head temperature increases? It never did that before but I don't believe I ever drove in temperature so hot for an extended period of time.

 

How many miles on engine? Sounds like an intake leak or gasket leak

 

It's not normal. This is on a rebuilt motor right?

 

Ed was the fan fully engaged or cylcling at the time and was the air on? I've never stopped with this truck after I pulled it so had that the fan was engaged but on my V10 I had it run a higher idle when stopped and after shutting it down it was normal when I started it back up.

Denny

 

This is on my remanufactured engine has about 30,000 miles. Yeah the fan was engaged everything seems to be working okay. The vacuum leak is an interesting possibility I will look into that. It hasn't done it since very strange

 

I'm thinking it was just the computer cooling the motor or A/C down. Most don't ever work their trucks hard enough to have this happen.

Denny

 

I'm on the same page you are.

STeve

 

I'm on the same page you are.

STeve

 

Hi Ed i live in southeast Texas and it seems like a guy could make some money hauling off flood cars the last month or so. I sure have seen a bunch of them on trailers.