I changed the cam in my car. Now it wont idle. The car is a 94 obd1. I have tuner cats and have tried a file from http://www.bfranker.badz28.com/LT1Edit/LT1files.htm but it still wont idle. The motor is stock other then cam, springs, headers.
If i go back to one of my files what all do I need to change to get it to idle? I know the idle speed but what else? Has anyone else opened the throttle blades by the adjusting screw or not? I need to get this running for the races saturday so thanks for the help.

 

Timing, Fuel, just the basics. If you want I can build you a file and email it to you. $75.00

 

Don't mess with the throttle blades unless you know exactly what you are doiing and how it affects other things. MHO.

 

thanks.


Well I got it running it idles decent. I will have to get exhaust on it so I can start driving it again.

 

What did you do to fix the idle issue? What were the symptoms of the idle?

 

Well I added a bunch of timing down low and the big problem on why it wouldn't idle is I had a vacumn leak.

It was real rough and when I eased in to it to get it to stay running it would go from almost no rpm to about 3500.

 

Thanks, Do you have your timing tables available to look at. I am getting ready to bump my TPS closed idle to 29 degrees, from 25 degrees. Mine always takes a while before it will idle on its own, as I have to throttle it for a little bit.

 

Main Spark Advance Vs. RPM Vs. MAP



RPM MAP (Kpa)

25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

400 25.0 25.0 25.0 25.0 25.0 25.0 24.0 24.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0

600 25.0 25.0 25.0 25.0 25.0 25.0 25.0 25.0 24.0 21.0 20.0 20.0 20.0 20.0 20.0 20.0

800 27.0 31.0 31.0 31.0 31.0 31.0 29.0 27.0 25.0 23.0 22.0 21.0 21.0 21.0 21.0 20.0

1000 32.0 35.0 35.0 35.0 34.0 33.0 31.0 29.0 28.0 26.0 23.0 22.5 22.0 22.0 22.0 21.0

1200 34.0 37.0 37.0 37.0 37.0 35.0 33.0 30.0 28.0 26.0 24.0 23.0 23.0 23.0 23.0 22.0

1400 35.0 39.0 39.0 39.0 38.0 37.0 36.0 35.0 34.0 32.0 30.0 28.0 25.0 25.0 24.0 23.0

1600 35.0 40.0 40.0 40.0 40.0 39.0 38.0 37.0 35.0 34.0 32.0 30.0 27.0 29.0 29.0 29.5

1800 35.0 40.0 41.0 41.0 41.0 40.0 39.0 39.0 38.0 37.0 35.0 33.0 30.0 31.0 32.0 32.5

2000 35.0 40.0 43.0 43.0 41.0 40.0 39.0 39.0 38.0 38.0 36.0 34.0 33.0 35.0 35.0 35.0

2200 35.0 40.0 43.0 43.0 42.0 40.0 40.0 39.0 39.0 38.0 36.0 35.0 34.0 35.0 35.0 35.0

2400 35.0 40.0 43.0 43.0 42.0 41.0 40.0 40.0 39.0 39.0 37.0 35.0 35.0 35.0 35.0 35.0

2800 35.0 40.0 43.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 39.0 37.0 36.0 35.0 35.0 35.0

3200 35.0 40.0 43.0 43.0 42.0 41.0 41.0 40.0 39.0 39.0 39.0 37.0 36.0 35.0 35.0 35.0

3600 35.0 40.0 43.0 44.0 43.0 42.0 41.0 41.0 40.0 39.0 38.0 37.0 36.0 35.0 35.0 35.0

4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0





Extended Spark Advance Vs. RPM Vs. MAP



RPM MAP (Kpa)

25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0

4500 35.0 41.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0

5000 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 40.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0

5500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 40.0 40.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0

6000 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 38.0 36.0 35.0 35.0 35.0

6500 35.0 42.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 41.0 40.0 38.0 36.0 35.0 35.0 35.0

7000 32.0 36.0 46.0 46.0 46.0 46.0 46.0 40.0 40.0 39.0 39.0 38.0 36.0 35.0 35.0 35.0















Closed TPS Spark Advance Vs. RPM



RPM Deg Spk

0 0.0

400 28.0

800 28.0

1200 30.0

1600 34.0

2000 34.0

2400 34.0

2800 35.0

3200 37.0

3600 37.0

4000 37.0

4400 37.0

4800 37.0

 

You might have to raise the "Default Min IAC keep alive steps" in the constants table.

 

Cool, can I bother you with your table ? I have
IAC warm park position vs Coolant (left side is coolant temp in Celsius)
-40 125
-28 116
-16 100
-4 98
8 96
20 80
32 70
44 60
56 50
68 50
80 45
92 45
104 30
116 25
Idle timeout steps vs coolant.
-40 10
-28 10
-16 10
-4 10
8 10
20 10
32 10
44 10
56 10
68 10
80 10
92 10
104 32
116 34
128 10
140 10
152 10

 

I didn't change those tables but if you go into the ECM constants down towards the bottom of the list is the Default Min IAC keep alive steps. It is just one number I raised mine up to about 40 or 45. It just helps it idle higher after the pcm gets reset.

 

Thanks, Mine was at 30