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

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diag​.​net/file/f2zomfxa7…

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