Idle Issues, Beginner Tuner

[JordanSBC427]

Hello,

Looking to get some help with regards to Idle issues. My father and I have put together a SBC 427, and had a basic tune dumped into it from a camaro so we could run it on the dyno. The small idle issue we have is that it will not start just by turning the key, I have to press down on the peddle to get it to fire. Once it starts, it idles reasonably well and usually around 550 rpm. We are running an LS1 ECM from EFI connection, and an aftermarket TPI from FIRST fuel injection. Not sure if the Idle air motor can't provide enough airflow for the tune or if we have to much fuel being dumped in during cranking. I have downloaded my tune on my laptop and looked around a bit but as of now, its all greek to me as i'm very new to this. Does anyone know of any quick things to test or checks that could help eliminate some possibilities?


Thank you,

Jordan

[JordanSBC427]

Anyone?

[joecar]

Hi Jordan, welcome to the forum, sorry I somehow missed this thread.


Have the VE and MAF tables been corrected...? If so, by what method (details) and after correction did you log the fueling error (aka BEN)...?

Log IAC steps to see what the IAC is doing... if the PCM can't open the IAC sufficiently you will see IAC pegging at max steps (130).

Post your tune file and any log files here in this thread.

[joecar]

So you're using a 0411 PCM to run a TPI system with harness/sensors suitable for the PCM...?

[joecar]

Also, for general tuning, see posts #4 and #29 here: Summary-Notes

[JordanSBC427]

Thank you, and no problem.

Are you asking if the tables have been corrected since the dyno? I have yet to log anything or change any settings after the dyno. The guy that did the dyno had his own tuner dump in the tune and set everything up for this engine. Now It is in my garage and I am trying to learn as much as I can about the tuning end of things and make it run as best as possible. I can only do some idle data logging at the moment as it is winter at the moment. Whats the easiest way to post/attach a tune file. The formats I try attaching are not acceptable....sorry.

Thanks.

[JordanSBC427]

So you're using a 0411 PCM to run a TPI system with harness/sensors suitable for the PCM...?

Yes I believe that sounds correct, not 100% sure on the 0411... I see;

OS: 12212156
Calibration: 12209171

under "calibration" of my efi live program.

But I believe it is out of a 2001-02 Yukon

[darcy]

The formats I try attaching are not acceptable....sorry.

You should be able to upload and attach a tun or ctz file without issue

[joecar]

At the bottom of the reply pane click Go Advanced and then click Manage Attachments...

[joecar]

Can you get your tuner to send you the final OBD2 log from the dyno (the one he did to verify his tuning)...?