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New Diesel Owner...

1039 Views 6 Replies 5 Participants Last post by  Country Chic
Im posting in this forum, as well. :)

The truck isnt new... im new to the truck. haha.

97 f350 stroke. 250,000 automatic, 4x4. recently purchased. (my new daily driver. i dont dog the snot out of it, either. im a smart driver...) as far as im aware, everything major in the motor, transmission, etc are stock...

ive been told that its running too lean. that its overheating slightly. i know i need a pyro and boost gauges to monitor, but i am unsure of how to approach this issue. there is a cold air intake which, im sure is filthy, so ill check that out on my own... can anyone suggest where i should start? my exhaust is 3-1/2" back to in front of the tire. no cat or muffler, i believe. (again, will have to confirm... but there is some back pressure now. :p )

any advice as to what actions i should take to get this truck runnin like a top would be greatly appreciated!! :SM030:

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Yes, Aaron is correct, the whole diesel engine process meters fuel into the engine in relation to the work the engine is expected to do by the position of the gas pedal. It ALWAYS takes in as much combustion air as it can, so operates on variable air/fuel ratios. That's why diesel engines get so stingy with fuel on light loads compared to gas engines which have to run a relatively constant air/fuel ratio.

Injection Timing is critcal to diesel engines, but that's all controlled by the computer on a PSD. Lots of things can cause the engine to run warm, a radiator blocked by dead bugs, low coolant, dirty coolant, slipping fan belt, worn out fan clutch, even a stuck thermostat like I had several months ago.

Since the truck is new to you, I'd start with an oil/filter change, new fuel filter, maybe even a cooling system flush & fill. Use a diesel recommended anti-freeze and be sure to add the diesel coolant additive, either the Ford stuff or FleetRite DCA-4, and get some test strips to make sure it's kept at the right concentration.

Your truck's exhaust sounds exactly like mine, no muffler, cat, 3-1/2 inch exiting right ahead of the right rear wheel. I even have the terrible stock downpipe, which is a restriction, but unless your going to chip the truck and tow heavy a lot that DP shouldn't cause a problem. For me at least, NO WAY am I beating up or taking a Sawz-all to my firewall to make room for a different DP.
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