obd1 6.5l ecm tuning?

[black dawg]

picked up a 95 6.5 burb that starts fine, but with 60g plugs in it I know it would start cleaner with a little more plug on time. Curious if anybody has experience with this...if it is even possible?

 

[diesel4me]

I just use a manual push button on my 6.2 with 60G's...but I have read online about some who have added a resistor to the glow plug controller to extend the glow time longer,so the 60g's will heat up more...

 

[black dawg]

Manual is a no-go for this one, and the resistor wouldn't work either, as the controller is just a relay controlled by the ecm. I have considered converting to the older controller and using a resistor, I am pretty sure this can be set up in the programming.

 

[bigblock454]

Bill Heath and Kennedy Diesel both offer reflashes, and yes the glow duration can be tweaked in software, at least the 96+ can. On the 94-95s you just swap the chip inside the ECM, I presume there is a table for glow duration on those as well.

 

[campfire]

Wouldn't a 1995 truck already be set up for long duration plugs?

 

[black dawg]

The plugs do stay on longer than the 85 up system, but really could be longer for cleaner starts with the 60gs. I have always used the bosch 80034 plug, as they are indestructible, but after some testing I could see that the 60g got hotter and stayed hotter than the duratherm, even though it takes very slightly longer to glow.

Right now it starts completely clean -zero smoke- at about 40 deg(13 seconds), but at 50-60 the on time is a few seconds less (9-10 seconds) and it is slightly smoky and rough for a couple seconds. I am being picky with this...what it is doing is by no means out of line with normal.....but it could be better.

 

[campfire]

The plugs do stay on longer than the 85 up system, but really could be longer for cleaner starts with the 60gs. I have always used the bosch 80034 plug, as they are indestructible, but after some testing I could see that the 60g got hotter and stayed hotter than the duratherm, even though it takes very slightly longer to glow.

Right now it starts completely clean -zero smoke- at about 40 deg(13 seconds), but at 50-60 the on time is a few seconds less (9-10 seconds) and it is slightly smoky and rough for a couple seconds. I am being picky with this...what it is doing is by no means out of line with normal.....but it could be better.

What sort of testing routine were they run through?

 

[black dawg]

What sort of testing routine were they run through?

nothing real scientific...... just powered from a battery, timed and used an ir temp gun.