DSMLINK Log Please Help

redeclipse7782 · 08-30-2006, 10:37 AM

New log, car is still overheating, timing seems to be way off in the log. I still can't set it with the timing gun. Everytime I try and set it for 5btdc it raises the idle to 1500rpm's when at 5btdc, then when I unground the timing the idle is 1800rpm's.
As far as the overheating issue I am going to replace the radiator with an alluminum one and put another fan on the front so I have one pusher and one puller.
Heres the log from dsmlink, thanks again.

zippyshoe · 08-30-2006, 06:32 PM

Concerning the high idle, I would check the following:

- Verify that the throttle plate closes fully with your foot off the accelerator (In DSMLink you could check that IdleSw = 1 when your foot is off the accelerator).
- Check for any boost leaks after the throttle plate (throttle body shaft seals, BISS screw, throttle body vacuum hoses, throttle body-to-intake manifold gasket, intake manifold-to-cylinder head gasket, etc.)
- Check that the ISC is functioning properly. (Just for curiosity, you may want to check the value of ISCPosition in DSMLink.)

Hope this helps you.

redeclipse7782 · 08-31-2006, 10:30 AM

Thanks, everything else checks out fine but the ISC value is steady at 43, how can I get this down to around 30? Do I have the move the valve on the ISC?

playitlouddsm · 08-31-2006, 04:01 PM

Log LrndldleAdj too, this should be right around 140 and ISCposition should be close to 30. You want the 140/30 relationship between the two. To adjust these you will need to have the car at operating temp and adjust the BISS, drive for a bit, then see where the two are at. Do this until you get the desired numbers. Good luck, i'm doing the same as we speak.

redeclipse7782 · 08-31-2006, 04:36 PM

With the BISS screwed all the way in my ISC is at 43, is there any way to adjust the ISC>? Will unscrewing the BISS lower the ISC?

95GSXracer · 09-01-2006, 08:20 AM

Before getting into the ISC stuff, you are aware that you can still set base timing regardless of what the RPM is? If so, leave it at 5 degrees, and deal with the high idle as a seperate issue.

The ISC is very slow to adjust, especially in the downward direction. What I would recomend is to reset the ECU to force the ISC to resync with the ECU and recenter the trims at 144. Then using the BISS, get the trim to stay at 144. This is very similar to setting fuel trims. The LearnedIdle is long term, and ISCposition is short term. And just like fuel trims, do whatever the ECU is trying to do for it with the BISS. If the Learned position goes too high, open the BISS. If it goes too low, close it. The sole purpose of the BISS is to keep the ISC motor in the center of it's travel in "normal" conditions so it has the most range of motion in both directions to adjust idle speed. The BISS is NOT for adjusting the idle RPM as most poeple commonly believe.

A couple notes. The car should be up to operating temp before making adjustments. Also make sure that your idle switch is working. Log it, and be sure it's all good. The ECU will not go into close loop idle speed control without seeing the closed throttle switch made.

Also be sure the throttle cable is set correctly. Loosen the 2 10mm bolts holding it, have a friend floor the throttle, pull on the cable's jacket until the throttle is fully open against the stop, and tighten the 2 bolts on the bracket. This will allow for full throttle opening to the stop, but more importantly maximum slack at idle. When the cable gets warm the jacket expands pulling on the cable

There is no point in getting into electronic troubleshooting until the mechanical stuff is verified. Namely the cable adjustment, throttle closed switch, and coolant temp (FIAV closed, if it's working

).

redeclipse7782 · 09-06-2006, 08:25 AM

Just checked the timing and it is off 1/2 inch. (Dowel pins up, timing marks on cams aligned) So if you are standing at the drivers side fender looking at the timing belt cover it goes:
(front bumper) 10btdc, 5btdc, tdc, 1/2inch, timing mark on crank pulley. (firewall)
I really hope this didn't damage anything internal.
Could I possibly have any worse luck with this car... (knock on wood)

95GSXracer · 09-06-2006, 08:28 AM

My EVO motor survived even when the crank skipped 90 degrees.

There is a good change you are ok, just realign the marks and do a compression test, and hope for the best.

redeclipse7782 · 09-06-2006, 11:23 AM

Just to be sure i am doing this right, while manually spinning the crank, the notch on the crank (for setting base timing) should be at tdc when the dowel pins on the cam are up (12 oclock) and the notches on the cams are aligned correct>?

zippyshoe · 09-06-2006, 02:33 PM

That's correct. With cylinder 1 at top dead center, the dowel pins should both be at 12 o'clock, the timing mark on the left camshaft sprocket should be at 3 o'clock and the timing mark on the right camshaft sprocket should be at 9 o'clock. A trick I used was to get a piece of string and lay each end of it at the center of each camshaft bolt and verify the string overlaps both timing marks. It can be difficult to eyeball this because of the location of the camshaft sprockets in the engine bay.