Hello again SHO Guru's,
Here's one that's got me totally stumped. I've got TWO 94 SHO ATX's with the same problem. Going up any significant hill at highway speeds, and each car is bogging down, to the point where it feels like there is a speed limiter on each car.
I took the intakes off each car. Cleaned each intake totally. Cleaned each MAF with MAF cleaner. Cleaned out the EGR passageways. New gaskets, new vacuum lines, new EGR valves, new IAB valve. New plugs, new wires. Cleaned the throttle body. Everything is back together, properly, and in each car - no codes. This problem first started with one car, then, just two days later, migrated to the other.
From WOT on flat ground - each car runs perfectly. Full power, auto trani shifts crisp in each gear. Start cruising on a highway, and hit a hill...each car now acts as if it were bogging, with no more power available to accelerate up the hill. Speed on each car will drop from say 65-70 MPH, down to as low as 45 MPH while climbing the remainder of the hill (like there was a speed control on it like say a U-Haul truck has). Once this glitch hits, stepping on the throttle only boggs the engine, further, but, no more available power. Get to the top of the hill, and each car will then scream down the hill with full power, again. ??? This glitch just started with each car, in turn. It also started prior to my work on each car (did the work in an attempt to correct the problem.)
I am totally stumped. Any suggestions would be greatly appreciated.
Frank
Here's one that's got me totally stumped. I've got TWO 94 SHO ATX's with the same problem. Going up any significant hill at highway speeds, and each car is bogging down, to the point where it feels like there is a speed limiter on each car.
I took the intakes off each car. Cleaned each intake totally. Cleaned each MAF with MAF cleaner. Cleaned out the EGR passageways. New gaskets, new vacuum lines, new EGR valves, new IAB valve. New plugs, new wires. Cleaned the throttle body. Everything is back together, properly, and in each car - no codes. This problem first started with one car, then, just two days later, migrated to the other.
From WOT on flat ground - each car runs perfectly. Full power, auto trani shifts crisp in each gear. Start cruising on a highway, and hit a hill...each car now acts as if it were bogging, with no more power available to accelerate up the hill. Speed on each car will drop from say 65-70 MPH, down to as low as 45 MPH while climbing the remainder of the hill (like there was a speed control on it like say a U-Haul truck has). Once this glitch hits, stepping on the throttle only boggs the engine, further, but, no more available power. Get to the top of the hill, and each car will then scream down the hill with full power, again. ??? This glitch just started with each car, in turn. It also started prior to my work on each car (did the work in an attempt to correct the problem.)
I am totally stumped. Any suggestions would be greatly appreciated.
Frank
