1998 yukon Mystery p0300 and rough idle still

[OilBurner2003]

It could be that you have a P1345 and your scanner can't see it. Dist installation could be off a tooth and close enough for it to run, just not run perfect. All the dist installs I have done had to have teeth correct , even 180 out wouldn't work.
BAFX bluetooth scanner I linked before has worked well for me 5 years or so. It is in the console and gets more use on friends vehicles than mine. I'm using Torque Pro which has a steep learning curve sometimes. DashCommand and others seem recommended here alot.
For more technical analysis and TWO way comms I'm using VCX nano. The MDI is supposed to be way easier setup and about $220 if you have a laptop. Good Luck!

Please stay on this thread until you get Everything sorted out. Then we won't have to chase around for what was, only back up a page or 3 to locate. Thanks.

That’s been the plan! All I’m waiting for is the Bluetooth OBD2 scanner to show up, and to figure how to get to the setting I need on dash command. When the scanner arrives, I will update you all.

 

[east302]

Trying to figure out what setting to use on the dash command to find CMP offset, or relearn, whatever they have it labeled as, the scanner might be here today so I want to get a reading BEFORE I mess with it to see what it’s at. Resources tell me it should be within 0 -2

It’s been five years or so since I used Dash Command, but I know that I had to buy the GM PID package from within the app. From that, you could add the PID to view by scrolling through a long list. I think it was called CMP RETARD or something very similar.

Spec is -2 to +2 degrees at 1,000 rpm.

 

[east302]

Here’s a post on another forum from 2018 going through the Dash Command steps.

Scanner Tool To Set The Timing????

The manufacturer can probably walk you through it better, but on mine if you click Account it should show you logged in. Click GM and then Purchase and it should have a check mark next to your PID. To me, that would mean that it’s loaded. PID list... Sent from my iPhone using Tapatalk

www.gmt400.com

You mentioned being unable to view photos on that site, so here are a couple screenshots. This was using a $30 Walmart android tablet as, at the time, I couldn’t get it to work on an iPad.

 

[OilBurner2003]

Here’s a post on another forum from 2018 going through the Dash Command steps.

Scanner Tool To Set The Timing????

The manufacturer can probably walk you through it better, but on mine if you click Account it should show you logged in. Click GM and then Purchase and it should have a check mark next to your PID. To me, that would mean that it’s loaded. PID list... Sent from my iPhone using Tapatalk

www.gmt400.com

You mentioned being unable to view photos on that site, so here are a couple screenshots. This was using a $30 Walmart android tablet as, at the time, I couldn’t get it to work on an iPad.

View attachment 385329
View attachment 385330
View attachment 385331

Thank you sir!

 

[OilBurner2003]

Here’s a post on another forum from 2018 going through the Dash Command steps.

Scanner Tool To Set The Timing????

The manufacturer can probably walk you through it better, but on mine if you click Account it should show you logged in. Click GM and then Purchase and it should have a check mark next to your PID. To me, that would mean that it’s loaded. PID list... Sent from my iPhone using Tapatalk

www.gmt400.com

You mentioned being unable to view photos on that site, so here are a couple screenshots. This was using a $30 Walmart android tablet as, at the time, I couldn’t get it to work on an iPad.

View attachment 385329
View attachment 385330
View attachment 385331

Well, we’ve run into a issue. The OBD2 Tool is only Android and PC, not IOS. Coulda swore it said IOS on it! Now I’m looking for it on my windows computer to try and find it.

 

[east302]

I had a similar issue. Cheapest android tablet from Walmart worked for me.

 

[OilBurner2003]

I had a similar issue. Cheapest android tablet from Walmart worked for me.

We ordered the right one, sources say it SHOULD be here today, here’s hoping. Also in the meantime, did a smoke test, did not see any vacuum leaks. At least I can probably rule out a vacuum related issue.

 

[OilBurner2003]

I had a similar issue. Cheapest android tablet from Walmart worked for me.

Scanner is here and all is connected! Bought the 98 yukon package, just trying to figure out how to get to that specific gauge for the CMP.

 

[east302]

In 2018 (probably an older version by now) the PID was under these menus

Data Grid>PIDs

Add PIDs
General
GM.Engine.CMP_RTRD[•]

Seems like it would then show the reading in the data log along with all the other things that it was reading. That or a gauge had to be added.

 

[OilBurner2003]

In 2018 (probably an older version by now) the PID was under these menus

Data Grid>PIDs

Add PIDs
General
GM.Engine.CMP_RTRD[•]

Seems like it would then show the reading in the data log along with all the other things that it was reading. That or a gauge had to be added.

That worked perfectly.

In 2018 (probably an older version by now) the PID was under these menus

Data Grid>PIDs

Add PIDs
General
GM.Engine.CMP_RTRD[•]

Seems like it would then show the reading in the data log along with all the other things that it was reading. That or a gauge had to be added.

That worked perfectly, geez, what would I do without you guys. Here’s one at idle, and here’s one at 1100 RMP. I have not touched the distributor or messed with it yet.