I have a 1997 f350 that doesn't make much boost until about 2500 rpm. I have had it to a mechanic and the only thing he can find is low exhaust back pressure. I have cleaned the tube, the sensor, the opening to the manifold, and even connected the sensor to the tube going to the MAP sensor. I also have a 1997 f250 and have swapped all of the following with no changes: PCM, IDM, EBPS, MAP sensor, and TPS. I have changed the fuel filter and clean the FPR screen. Any help would be greatly appreciated.
How's it run, no miss fires no restriction on the intake side, you can take the air tube off and watch the turbine spin correct? Intake leaks? you changed a bunch of parts but they have nothing to do with boost. Simple air in air out, put some wet rags in the tailpipe and listen for any leaks around the manifold, up pipes, turbo flange, do you have a boost gauge? I'm throwing alot out at ya but hopefully something will stick.
Truck runs fine. No missing just can't get out of its own way at low rpms. Seems like it does not downshift as much as the f250 either. This morning, I drove with the mechanic as the passenger. He read the scanner as we rode around. He said that boost peaked at 13 psi but was really low at low rpms. There were some leaks on the intake plenums but they were fixed.
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