changing injector timing

[9365turbo]

I have a 93 k3500 6.5TD. It has a intercooler,new injectors,home made cold air filter kit and free flowing exhaust. Its MPG is 13 in town and 17 on highway at 70mph. Will messing with the pump timing make better MPG or what? I also turned the pump up a bit.

[Robyn]

If its running good and starts fine I would not mess with the timing.
The numbers you are showing are about normal for a 1 ton.
Drop the cruising speed down to about 60 and the Hwy numbers will come up some.
My 95 dually will see 18 Hwy and 15 city if I behave myself

Ramping up the timing a tiny bit to compensate for timing chain wear wont hurt but just a little bit.
Too much and the sucker will rattle badly.

Getting a good idea where its at would be a better starting place rather than arbitrarily advancing it.

Since you tweeked the IP some this is going to steal a little MPG however it will give a little more power.

If the IP has a lot of miles on it you could be seeing some power and MPG loss from wear within the pump.
Over time the advance piston wears and this can take its toll on things.

Good luck

Robyn

[jpgreen]

I want to be able to set my own timming on my trucks.

What gage/tool/scope do I need to buy to accurately set injection timming on a 6.5 electronic and 6.2 DB2, and where do they sell it?

None of the mechanics in my area can set this timing.

[9365turbo]

I will leave it alone then. I asked because I'ved seen people on here with the timing changed,but they might have had the electronic pump were as I have the mechanical one. My truck does have 180,000 miles on it. the truck does run good and starts good. It probally wouldnt hurt to have the pump rebuilt.That will have to wait until next year.The only thing I have noticed more since putting the intercooler on is the oil from the CDR seeping out of the tubing to the intercooler. Which I seal up with silcone sealer.

[Wing Nut OOA]

with a 95 you can view your timing specs with the engh motors GMTD ScanTech program

it also has a TDCO set and TDCO learn that you can use in conjunction with manually rotating the pump to get your target Injection Timing.

[Wing Nut OOA]

IN ADDITION! since i am for some reason not able to create a new thread at this time.


what would you do in the situation where your Desired injection timing and Actual injection timing are 8.5 while the TDCO is 0* and it is adjusted all the way to the passenger side, yet STILL 1/8 inch off the timing mark. the slots in the pump wont let it rotate any further.

i hear people running up to -1.75 for towing purposes (is that right?) and -0.5* is stock but mine is stuck at 0.

i can rotate it the other way and it was at +2.02 but i dont think that is where it should be run.

i've heard people say anywhere between + and - 2.02 is fine yet i'm throwing a code 88, and just started with a code 56.