Lowering Cold Start Idle
03-29-2009, 04:37 PM
#1
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Lowering Cold Start Idle
I am assuming the Coolant temp sensor determines the cold idle speed, and lowers it as the engine warms up, but i was wondering if I could effectively get rid of the cold start idle by bypassing the CTS. If I bypass the CTS will the lower idle effect anything negatively? Yes it will take longer to warm up but what else? I dislike the drivability when cold, and wouldnt mind saving some gas. I could be off about this but I am curious to find out more, and I couldnt find anything relavant searching. I would like to hear some others thoughts about this, thanks.
03-29-2009, 05:25 PM
#2
You're going to have more changes than just a lower cold idle if you completely remove the ECTS. The ECU uses the coolant temp input for more than just a higher cold idle, including cycling the fans and detecting an overheat condition.
You could try adjusting the FITV/FIC, but with mine completely bypassed I still get the typical cold idle sometimes. It's an ECU thing, you can't do all too much about it.
You could try adjusting the FITV/FIC, but with mine completely bypassed I still get the typical cold idle sometimes. It's an ECU thing, you can't do all too much about it.
03-29-2009, 06:02 PM
#3
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Oh man I dont even know what i was thinking. The fans rely on that sensor, and yea, overheating conditions wouldnt be detected, not worth risking. Whats the FITV/FIC? I would look into the FSM but im not at home/on my computer. Thanks pmohr.
03-29-2009, 06:08 PM
#4
It's on the TB directly beneath the main throttle cam:
03-30-2009, 08:17 AM
#7
Mine shoots to 1,700. So this is normal? I was going to make a post about it eventually because it didn't used to do that (before I went 00VI and then de-00VI). It gets down to regular idling range in like 10 seconds, but I always wondered why it shot so high up.
03-30-2009, 01:22 PM
#9
What should it be? Do we know that? Is it in the manual somewhere? This is my stock TB, I didn't play with it when I took it off for the 00VI swap. But I also don't recall it being that high before.
03-30-2009, 01:37 PM
#10
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Look at the picture pmohr put up, there are marks on the cam and follower that should align when cold I believe. The info is in the FSM.
I did not set mine that way, I tweaked it to the ~1500 rpm cold start.
Setting it up with the marks resulted in a higher rpm initial cold start.
I did not set mine that way, I tweaked it to the ~1500 rpm cold start.
Setting it up with the marks resulted in a higher rpm initial cold start.
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