The magazine automotive repair shop owners and technicians read first to learn about the latest tools and equipment in the automotive aftermarket that can increase productivity in the shop and maximize billable hours. VehicleServicePros.com is the official website of PTEN magazine. Corporate Partner

Old School - GM TBI - Distributor Waveforms

Scott Owner/Technician California Posted   Edited  
Resource
Driveability
1987 Chevrolet V10 Suburban Custom Deluxe 5.7L (K) 4-spd (THM700-R4/4L60/MD8) — 1GNEV16K9HF160206
Stall At Idle
Erratic Idle
Extended Crank Hot

Here are some before (aftermarket performance distributor) and after (New GM stock distributor) waveforms from this erratically behaving Suburban.

Old @ 400 Dist RPM

New @ 400 Dist RPM

Old @ 1000 Dist RPM

New @ 1000 Dist RPM

diag​.​net/file/f2uon1u8j… ​

diag​.​net/file/f5jchyzcc… ​

diag​.​net/file/f3ms6nwaq… ​

diag​.​net/file/f2zomfxa7… ​

0
The magazine automotive repair shop owners and technicians read first to learn about the latest tools and equipment in the automotive aftermarket that can increase productivity in the shop and maximize billable hours. VehicleServicePros.com is the official website of PTEN magazine. Corporate Partner