east3021

The connector uses Bluetooth to communicate with the phone/tablet. I used BAFX model 34t5 on my two 98 models. It came with instructions for setup. The link that I posted showed the steps for getting the CMP offset reading in CarGaugePro. You’ll either watch the reading and rotate the distributor while the engine is running or take the reading, stop the engine, adjust the distributor and repeat. Here a YouTube video on it using a scanner, same principle with the app... Sent from my iPhone using Tapatalk

I think that that I’ve heard of the 4.3L having a fixed hold down clamp preventing rotation (I’m not sure as I’ve never had one) but on the 350 vortec you stab it and then have to rotate the upper housing to get the CMP offset within spec before tightening down the hold down clamp. You won’t be physically lifting up and going from tooth to tooth, it’s just the cap and rotor housing that you are turning. Here’s the diagnostic for P1345 (for a 1998 K1500) in case it is something else causing the code. Sent from my iPhone using Tapatalk

DashCommand and CarGaugePro are two android apps that can read the CMP retard. I think they’re around $20 or so. You’ll need a Bluetooth OBD adapter (maybe $40) and a cheap android tablet if you don’t have an android phone. I use a $30 Walmart RCA tablet. Here’s a link... http://www.gmt400.com/threads/car-gauge-pro-can-read-cmp.35275/ The app (or scanner) doesn’t actually set the offset. You do that by loosening the distributor hold down screw and turning (rotating) the distributor until the offset is correct as read by the scanner. RPM has to be around 1100-rpm. To compensate for a positive reading, rotate clockwise. Counterclockwise for too negative of a reading. It doesn’t take much, you’ll eventually just be barely bumping it to get it to specification. Sent from my iPhone using Tapatalk