97 7.3 problem HELP - Ford Powerstroke Diesel Forum
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Old 01-22-2007, 06:12 AM
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Exclamation 97 7.3 problem HELP

i have a 97 7.3L ext cab 2wd truck that is basically stock except for a K&N intake and a straight exhaust. a while back i noticed a small leak in the fuel hose (I think thats what it is) under the big plastic cap in the center of the engine because the top of the engine had a little green fluid on it.
I thought it was antifreeze cause it was green but someone told me it was diesel fuel and that is the color of this new Low sulfur stuff they have been selling...now i told you this because this is my real problem
Recently since it has been getting colder (i live in phoenix) the truck runs a little off after a night when it gets down in the 30's and i DONT have the block heater plugged in. when the engine starts to rev up i hear
1. Something holding the engine back....it drops down about 200-300 rpm's
2. and a strange blowing or hissing sound that sounds like someone letting
air pressure out of a tire

I dont have a clue why it is doing this and it only does this after an unusually cold night when it gets a little cold...in the 30's.. it does NOT do it if i keep it plugged in or if it wasnt that cold at night... it doesnt do it when i drive home in the afternoons or once the engine is completely warmed up...its frustrating because it stops sometimes about when i pull into where i work...(I work about 10 miles from my house and it is complete city traffic the whole way)

Is it getting gelled up? i replaced the fuel filter about 10,000 miles ago, and i have started to run a fuel additive that is supposed to help out on that....any help is desperatly needed!!!!!
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Old 01-22-2007, 06:15 AM
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Actually what you are experiencing is normal...its the EBP valve closing to warm the engine up faster. There is an electrical connection under the turbo on the turbo pedestal right above your fuel pump. If you disconnect that connector, the valve wont close. That is actually something that is supposed to happen though, but at 30 degrees you probably dont "need" it either.
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Old 01-22-2007, 07:07 AM
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um shouldnt it have done that before? it just started a few months ago and i have never noticed it before and my dad has owned that truck since 99 when it had about 30,000 miles on it..........
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Old 01-22-2007, 07:15 AM
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like marc said that is normal ,you said your dad had the truck before ,did he have aftermarket air filter and exaust on it when he owned it if not thats why you didnt hear it, after market exhaust and air filter makes it alot louder
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Old 01-22-2007, 07:37 AM
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Since I have not seen or ran ULSD fuel yet I can not comment on the color of the the fuel. If you in fact have diesel fuel in the valley of the engine there are several places it could be coming from. Fuel hoses in and out of the fuel filter/separator, fuel filter/separator itself or the fuel pump. If it is coolant leaking then that is another situation altogether.

Doug
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Old 01-22-2007, 09:44 AM
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the ebp valve only closes under certain conditions....namely based on engine oil temp. Its only used in the cold
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Old 01-22-2007, 08:18 PM
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yeah he had when it just had the intake on it for a while and not too long after i bought it......OK well i trust you guys and Thanks for the advice!
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Old 12-27-2007, 06:04 AM
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What does that connection look like? i disconnected it last year when I first had this problem and wala it worked. dont remember what it looked like though and its doing it again. I found a connection that has two prongs on it and it was connected. I dont ever remember connecting it back though. But its in the location you told me on the right side of the turbo.
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Old 12-27-2007, 06:16 AM
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My truck does the same thing in the cold. And I noticed it more after I modded the exhaust.
The plug is right of the turbo, and has two wires going to it. I cut my plug and hooked it to a switch so I can close it when I want (mainly for an exhaust brake).

If you need to see it visually, some of us AZPSDer's meet at Hooters on Friday's. I can let you know the locations if you'd like.
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Old 12-27-2007, 06:33 AM
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Yep, i belive thats the one. I live on power and baseline. where at?
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