Hey MyCar,

On the 6Inline equipped cars it is a common problem, and I have discovered many cars in the junk yard here in the Sacramento Valley many have traces of repairs/part swaps/modifications, so it is a common problem.

The problem happened to me, and with my electronic component level experience.I found the driver transistor to the air pump on the engine computer shorted. On the 6Inline, it does not go to a buffer relay. I replaced the computer, and that is what it was..

Before you decide to replace the computer, You must not have the corroding engine wire harness, and on the 6Inline disconnect the connector to the airpump solenoid as both are actuated together, and they are in parallel in the same circuit. The air pump clutch must engage and disengage with 12v applied.

The reason i had the problem is the previous owner had replaced the airpump, and tinkered with all the vacuum plumbing responsible for the airpump, airpump solenoid, and egr solenoid.

Hope it helps,

Martin