No power when driving
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From: Captain Cook, Hawaii
No power when driving
Hi, New to the forum and new to 7.3L Power Strokes, but I am familiar with 6.0 power strokes. I just got my hands on a 96' 7.3L DI Turbo Power Stroke. It starts great, WTS light comes on fires right up. Engine rev's fine, up to 3000. Battery's are good, fuel is good, no codes, no MIL, or CE light, but then comes the mystery, no power under load. Engage the clutch, pop her into first no umph, second gear, 1500 rpm, no umph, and so on. In about 3 minutes I can go from 0-25, in three gears, suppose to be a new clutch in the tranny, no smoke, at all. No slipping clutch. Just no power when the wheels hit the ground. With no codes where to start, it has about 186K on the odometer. I am looking for a direction to go. Thanks for any help.
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From: Captain Cook, Hawaii
I can probably check the fuel pressure at the schrader valve if it is not to high. I do remember running a data stream this morning and I thought at idle the pressures were in the 800's. I don't know how to check the oil pressure? I am assuming your talking about the HPOP? Or actual oil pressure? No I really don;t hear a sucking or blowing sound at all, the motor is pretty loud, in comparison to my 6.0. The best way to describe the motor sound is a clacking sound, engine oil level is on the mark. Hope this helps with the diagnosis.
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From: Northeast Ohio
If you can do a data stream try to do it while the truck is on a load and see what happens to the oil pressure number. Yes high pressure oil. And yes you can use the Schrader valve for fuel pressure. Is the truck running louder then normal? Not the exhaust but the engine it's self.
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From: Captain Cook, Hawaii
OK i'll check the fuel pressure and disconnect the MAP and see if she will run any better. I will also pull the AF and change, along with the fuel filer. Thanks for the help
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From: Captain Cook, Hawaii
OK 60 psi fuel pressure bounces between 55 & 60. MAP was disconnected and power was better but still weak. Going to put in new AF & FF and check the return line filter. I am going to run another data stream while driving kind of a challenge with this truck in this condition. We will see what comes up, CEL came on when I disconnected the MAP. Not one parts store in Hawaii including the dealership has a MAP sensor for this truck. I will probably order one from Rock Auto. I will keep you updated as things progress. One guy I spoke to and heard the engine says it sounds like its missing because of the rough idle????? Everyone's got an opionion. I would rather trouble shoot it correctly find the root cause and move on, if there is another issue at hand. Thanks for the pointers and the directions
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From: Medford Oregon
Hi, New to the forum and new to 7.3L Power Strokes, but I am familiar with 6.0 power strokes. I just got my hands on a 96' 7.3L DI Turbo Power Stroke. It starts great, WTS light comes on fires right up. Engine rev's fine, up to 3000. Battery's are good, fuel is good, no codes, no MIL, or CE light, but then comes the mystery, no power under load. Engage the clutch, pop her into first no umph, second gear, 1500 rpm, no umph, and so on. In about 3 minutes I can go from 0-25, in three gears, suppose to be a new clutch in the tranny, no smoke, at all. No slipping clutch. Just no power when the wheels hit the ground. With no codes where to start, it has about 186K on the odometer. I am looking for a direction to go. Thanks for any help.
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From: Captain Cook, Hawaii
I am running a genisys scanner, Ran an automated System test Detail as follows:
Rev Per minute 655
Baro Boost 2 28.96 inHg
Baro Press 14.22 psi
Engine Oil Temp 182F
Inj Control Press Abso 579.4 psi
Inj control Press 579.43
Inj Press Reg Duty CYC 14%
MAP for Boost 2 0.00psi
Manifold Absolute Pressure 30.71 inHg
Manifold Absolute Pressure 15.09 psi
Net engine torque 64ft.lbs.
Volume fuel desired 17 mm3
Spark Advance 64 degrees
Exh Back Pressure 17.81 psi
Exh Back Pressure volts 1.24
No O2 sensor reading at all, also no Short term Fuel trim reading for Bank 1 or Bank 2 everthing reads -100% or 0.00V on the O2 sensors. This was at idle.
Rev Per minute 655
Baro Boost 2 28.96 inHg
Baro Press 14.22 psi
Engine Oil Temp 182F
Inj Control Press Abso 579.4 psi
Inj control Press 579.43
Inj Press Reg Duty CYC 14%
MAP for Boost 2 0.00psi
Manifold Absolute Pressure 30.71 inHg
Manifold Absolute Pressure 15.09 psi
Net engine torque 64ft.lbs.
Volume fuel desired 17 mm3
Spark Advance 64 degrees
Exh Back Pressure 17.81 psi
Exh Back Pressure volts 1.24
No O2 sensor reading at all, also no Short term Fuel trim reading for Bank 1 or Bank 2 everthing reads -100% or 0.00V on the O2 sensors. This was at idle.