LT1, OBD1, M6, high idle issue

[steve40]

Thanks for the info steve. No, other than the knock I have NO driveability problems. I zeroed out the burst knock table, just to eliminate that posibility. I did notice that im running quite rich at idle, any way to correct for that? To me it seemed that the entire run, minus the full throttle run, was kinda rich acording to the BLMs. Thanks again for all your help. Eric L

no prob....i found the best was the injector trims at idle....i take it you are using tunercat.....cause its just a multiplier....plus you can tweak each cylinder if you notice any loading up.

[JoeliusZ28]

eric, to edit the maf table, you adjust the air flow numbers. really need a wide band, so say at 200 g/s, your wideband reads one way, then you find 200 g/s and then incease or decease the values on the maf table there. pretty much recalibrating the maf to think at a certain hz its seeing a different amount of air flow.

but really, if you don't have any driving issues, everything looked good cept for the knock.

spot on. MAFs often need to be recalibrated after so many years use.

That being said, my car has ALWAYS done the 1500 RPM high idle thing. I asked about it years ago on the tech boards and everyone assumed that they were programmed that way. Ive been trying to figure out how to defeat it in the tune also with no success, I find it very annoying.

If you ever want to talk tuning I am always down to chat about it, although you probably know more than i do at this point than me.

[meissen]

I just wish there was a centralized place to learn tuning on FBodies. Each site seems to have their own forum for it but none of each site seems to have a lot of regular posts.

[JoeliusZ28]

I just wish there was a centralized place to learn tuning on FBodies. Each site seems to have their own forum for it but none of each site seems to have a lot of regular posts.

tell me about it, the ammount of research I have done just trying to figure out how to do something simple has been more than enough to get me to convert to an LS1 PCM and use HPTuners which seems incredibly self-explanatory in comparison.

[steve40]

ls1 stuff is much more user friendly...using efilive myself....but it does add so much more to take care off....to me it felt like starting over again!

always down to talk some tuning....always open to learn more about it

[JoeliusZ28]

You ever figure anything out with this eric?

[prorac1]

Yes, kinda, lol. I reset the IAC per shoeboxes website and it made it tons better. It still idles a liitle higher than normal when coasting up to a light. The way to get rid of it completely is to zero out the throttle follower tables, but than you take the chance of stalling when coasting up to a stop. Min is only 3-400 rpm higher than it should be, which for me is acceptable. Eric L

[JoeliusZ28]

Yes, kinda, lol. I reset the IAC per shoeboxes website and it made it tons better. It still idles a liitle higher than normal when coasting up to a light. The way to get rid of it completely is to zero out the throttle follower tables, but than you take the chance of stalling when coasting up to a stop. Min is only 3-400 rpm higher than it should be, which for me is acceptable. Eric L

awesome thank you im definitely going to look this post up in the spring and give that a try.

I just noticed you have a 97, i take it you did an OBD1 conversion?

[prorac1]

Yeah, kinda. I bought the car with low millage as a roller. I pulled the motor out of my 94 z28 and put new berings, oilpump, and gaskets, and threw it in the 97 SS along with my T56 trans. It was pretty much plug and play seeing how I already had the OBD1 knock sensor. That and I already had the tuning software for it. Hopefully ill be building another motor for it in a few years. So far my plans are a cast 383 stroker kit with cheap forged pistons, with a comp 306 cam and some Lloyd Elliot heads, shooting for around 400 rwhp, shouldnt be a problem. For this winter/spring, my plans are to switch back to 4.10 gears. In the 94 my current combo with 4.10 gears was good for 12.80s @ 107. Eric L

[JoeliusZ28]

Yeah, kinda. I bought the car with low millage as a roller. I pulled the motor out of my 94 z28 and put new berings, oilpump, and gaskets, and threw it in the 97 SS along with my T56 trans. It was pretty much plug and play seeing how I already had the OBD1 knock sensor. That and I already had the tuning software for it. Hopefully ill be building another motor for it in a few years. So far my plans are a cast 383 stroker kit with cheap forged pistons, with a comp 306 cam and some Lloyd Elliot heads, shooting for around 400 rwhp, shouldnt be a problem. For this winter/spring, my plans are to switch back to 4.10 gears. In the 94 my current combo with 4.10 gears was good for 12.80s @ 107. Eric L

ah gotcha. awesome, i have similar plans. I think the 3.42s are holding me back right now.

[prorac1]

Yeah, with my car being a N/A bolt on car, the 3.42s are deffinately not helping me, thats for sure. With the 4.10s in the car it had a lot more zip, and got just as good, mpg. Eric L

[Phantom409]

I think if I had a different cam I would be happier with my 4.10's?

[prorac1]

What do you mean? Cam to peaky, or have to much bottom end? Eric L