[rbuswell]

1987 924S project car, manual gearbox, USA, mileage unknown but indicates about 51k miles (odometer failed who-knows-when but now repaired). PO estimated about 175k miles.

Some new OEM or better parts ... plugs, wires, cap & rotor, fuel filter, injectors rebuilt by RC Injectors, new timing belts, new K&N air filter, rebuilt alternator (on its last leg according to rebuild shop). Muffler's a little more flow-through but nothing radical. All things I would have done anyway given their condition. Use mid-grade fuel which is 87 octane in Colorado. CAT was replaced just before I bought the car and it passed Colorado emissions but not by much.


Things that could be a factor: Bosch fuel pump appears to be original, have not changed out fuel regulator, DME relay, or other control relays. Most of my driving so far has been near my home at 6,200 elevation.

Symptom: Starts easily, idles nicely, has good power from a standing start but goes flat mostly in high second gear and third gear about 2k RPM and up, settles back out at cruise (fourth and fifth). It acts like it's missing but you can't really hear that it is. It did the same thing before I replaced any parts. Gets a little better after the car has warmed up and been driven a while. All other vitals signs are good (temp and oil pressure, etc.). Seems to get pretty good gas mileage but don't really know since the odometer was just fixed.