Help !!! My head ia about to burst.
I have read the tunning manual time and time again and still don't know satrt. I have installed a ms2 with a v3.0 running code 2.3 in GM 3.1 with 8lbs of boost. I can start and run the car but the idle is high and it is running rich. Where do I start? I am attempting to attach a datalog. Please HELP
Idles too High
Forum rules
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
-
Mike_Robert
You have excess air entering from somewhere, perhaps a gasket leak, a misadjusted idle screw, a split hose or a leaky brake booster diaphragm among many other potential sources. Please don't try to tune around this, you need to find out where the extra air is coming from. The richness almost certainly has nothing to do with the high idle. Also, most engines like to idle richer than stoich if that was your goal for an idle mixture.
-Mike
-Mike
-
Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Blatzy,
In addition to the vacuum leak potential sources Mike mentions, alo check your idle air controller (if you have one) to be sure it isn't open all the time.
If this is a GM stepper style IAC, and you aren't using MS-II to control it, then it may be in an intermediate position and allowing a lot of air to bypass, raising the idle. You can tape over the IAC port on the 'horn' of the throttle body to fix this - feel with your fingertip, you'll find it pretty quickly (or get the IAC working...)
Lance.
In addition to the vacuum leak potential sources Mike mentions, alo check your idle air controller (if you have one) to be sure it isn't open all the time.
If this is a GM stepper style IAC, and you aren't using MS-II to control it, then it may be in an intermediate position and allowing a lot of air to bypass, raising the idle. You can tape over the IAC port on the 'horn' of the throttle body to fix this - feel with your fingertip, you'll find it pretty quickly (or get the IAC working...)
Lance.
-
Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Blatzy,
The next thing to do is to adjust the idle speed with the throttle stop screw. On GM TBs, it is often hidden behaind a cap (I drill a small hole in the cap and ue a sheet metal screw threaded into that hole to extract it).
Then you can use a screwdriver to turn the idle speed adjustment screw and fine tune the idle speed.
Lance.
The next thing to do is to adjust the idle speed with the throttle stop screw. On GM TBs, it is often hidden behaind a cap (I drill a small hole in the cap and ue a sheet metal screw threaded into that hole to extract it).
Then you can use a screwdriver to turn the idle speed adjustment screw and fine tune the idle speed.
Lance.