1987 GMC Jimmy
Automobile Hoarder
- Joined
- Jan 23, 2016
- Posts
- 5,848
- Reaction score
- 2,389
- Location
- Mississippi
- First Name
- Jesse
- Truck Year
- 1987
- Truck Model
- V1500 Jimmy
- Engine Size
- 350
Oh, I'm sorry. I should have been more specific. I was talking about the voltage relative to vacuum. Did it not descend properly? 1.1 is good when the sensor is pumped up to 21" of vacuum. It should have had around 4.7 with just the key on. If so, it's definitely possible that both were bad. I've had a part go bad, and the replacement was bad several times. ECM and ignition control module come to mind. Electronic parts are usually the worst ones, especially cheap ones. The Delco MAP sensor is the best way to go bar none. I'm sure you can get it for a fair price on RockAuto, and don't forget the five percent discount code found in their preferred vendor section.