Hey, I'm looking for some input here. We have an ITB Volvo 142E, with the D-jetronic fuel injection. THe problem is that the car leans out under load. It starts out in the mid-13s for air-fuel ratio at idle and progressively leans out on the dyno until about 4000 RPM, at which point it won't pull any higher. The sparks appear to be OK, we are using an MSD and it appears to be working correctly. We are using about 29-30 PSI fuel pressure, and about 35 degrees total advance (around 5-6 deg advance at idle.)

We are totally stumped: our conjecture is that maybe the computer isn't getting the signal that the RPMs are increasing and therefore the duty cycle of the injectors doesn't increase? It runs up to high RPM just fine in the garage with no load...

Ideas please!