1999 Vortec 5.7s (alot of questions)

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10-06-2011
Adam_NG

1999 Vortec 5.7s (alot of questions)

I am trying to diagnose a Misfire Cyln4 304 error that is driving me nuts. I want to find out if the tuner might help me find out the problem as well as tune up my vehicles.

I have a 1999 Suburban 1500 5.7(R) vortec as well as a 1999 C2500 with a 5.7(R) Vortec.

I have changed over the Suburban from the Central point injection to the new Multi-point injection which helped the engine a ton....a mod I HIGHLY recommend!

What I would like to know:
1. can the tuner help me diagnose the problem.
2. Let me tune the gas delivery to optimize the mileage of the vehicles
3. Tune the transmission so I get better shift point and firmness
4. are there "standard" parameter files or numbers that people have developed that I can plug in my trucks?

What else can I tinker with in these engines to get them to run better and get better mileage.

One last thing, I was thinking about converting the belt driven fan to an electric one but need to find out if I can use/program the ECM to turn on and off the fans (for temp and for A/C)

I know this is a lot to ask but I don't know where else to start.

Thanks!!!
11-26-2011
HRD

I don't think HP Tuners supports the 5.7L Vortecs. I'm in the same boat as I have a 96 Vortec 5.7L in my 67 pickup and would love to be able to tune it.
11-26-2011
PitchblackC3

yes, it does. But only the 98-up. His 99 is supported.
11-26-2011
HRD

Quote:

Originally Posted by PitchblackC3

yes, it does. But only the 98-up. His 99 is supported.

That's interesting. I don't want to hijack the thread, but can you tell me if a 98-99 ECM will work with my 96 harness?
11-27-2011
wyochimneysweep

Quote:

Originally Posted by HRD

That's interesting. I don't want to hijack the thread, but can you tell me if a 98-99 ECM will work with my 96 harness?

You have to re pin the harness for a 98-99 ecm or go to a 411pcm and re pin for it