Xit40
15+ Year Contributor
- 264
- 2
- Nov 23, 2004
-
Weedsport,
New_York
Ok so I recently put a 1G Throttle Body on my 2G and have been having difficulties with the idle. I have the Back up service manual and have read how you need a scan tool to adjust the BISS screw to idle the car down. It so happens that my brother in law is an Auto mechanics teacher at a local college so I have free access to his scanner (thank god). So I went over there yesterday and got the TPS adjusted to like .1% which was close enuff for me which helped the car idle down some. After that he started adjusting the BISS screw. In the service manual it says start the car and run at idle with the vehicle in neutral, all accessories off, and coolant between 80-95 C; hook the scan tool up and select item number 30 of SCAN TOOL (MUT-II) Actuator test. Now my question is this: my brother in law insists when he hooks up the scan tool that it holds the IAC at base idle without selecting it as the manual says is this true or does he need to select something specific as the manual says? I think he's wrong and have tried to explain it to him, but would like someone else's experienced postion. So right now my car idles at about 950ish with the BISS screw almost all the way closed no surge or anything like that just nice smooth idle it's just kinda high. Also I've been over there twice and had it hooked up and after both times the CEL has come on with code P505 for the IAC. I believe this has something to do with the scan tool being hooked up because it has never come one before ever. This is the same IAC that as on my 2G Throttle body for months and months and I never had a problem with the idle on it. It was always about 800ish. So after having the code read the first time I thought it was kinda odd and cleared it to see if it would come back. I drove over 250 miles with no sign of another CEL but after returning to my brother in laws and having him hook it back up to his scan tool and playing with the BISS screw some more it came back on within 40 mins.