Power FC Power FC Idle control?
10-09-05, 12:04 AM
#4
Full Member
Join Date: Jun 2004
Location: Dallas, Texas
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
I know that Chuck posted that ISC was one of the things that could be removed. I just removed it and all of my emissions and now am having some serious issues. Hopefully someone with more experience with this will post soon.
10-09-05, 04:04 AM
#5
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
The PFC does use the stock ISC to control idle under varying conditions. Chuck has removed his and has a write-up about what is required. Most of the rest of us just leave it -- mine works pretty well in almost any condition. However, I did have to replace my ISC last year.
Unless you really know what you're doing or are willing to put the time in that Chuck has to adjust everything, I would leave it alone.
Unless you really know what you're doing or are willing to put the time in that Chuck has to adjust everything, I would leave it alone.
10-09-05, 08:43 AM
#6
Eye In The Sky
iTrader: (2)
Join Date: Feb 2001
Location: In A Disfunctional World
Posts: 7,902
Likes: 0
Received 119 Likes
on
69 Posts
The stock ECU uses the ISC to control air flow, and O2 sensor to control fuel lAFR level. The idle speeds are fixed.
The PFC also has idle timing control and adjustable idle speeds.
But remember that all control systems use some type of feedback system, and are programmed to work within specific boundaries of the parameters( fuel, air flow, rpm, TPS voltage, etc.). A very modded engine with low back pressure, and/or large ports often start to idle on the edge or out of range of these parameters and thus will not idle correctly, or poorly.
My car started having idle control issues right after I went DP, hi-flow cat and cat back even with the stock ECU ,and with and XS reprogrammed ECU back around 1995.
With the PFC mine use to work ( had to adjusted it differently between summer and winter using the air bleed screw) untill I removed the fuel purge valve system from my car. Then I had to open the throttle more to get the engine to idle. This must have pushed the TPS voltage out of range, and my engine revs would oscillate no matter what I did. So I removed the ISC control and went to 100% manual control of fuel and timing.
The PFC also has idle timing control and adjustable idle speeds.
But remember that all control systems use some type of feedback system, and are programmed to work within specific boundaries of the parameters( fuel, air flow, rpm, TPS voltage, etc.). A very modded engine with low back pressure, and/or large ports often start to idle on the edge or out of range of these parameters and thus will not idle correctly, or poorly.
My car started having idle control issues right after I went DP, hi-flow cat and cat back even with the stock ECU ,and with and XS reprogrammed ECU back around 1995.
With the PFC mine use to work ( had to adjusted it differently between summer and winter using the air bleed screw) untill I removed the fuel purge valve system from my car. Then I had to open the throttle more to get the engine to idle. This must have pushed the TPS voltage out of range, and my engine revs would oscillate no matter what I did. So I removed the ISC control and went to 100% manual control of fuel and timing.
Last edited by cewrx7r1; 10-09-05 at 08:48 AM.
Thread
Thread Starter
Forum
Replies
Last Post
imitek
3rd Generation Specific (1993-2002)
9
08-28-15 05:28 PM
rxmiles
3rd Generation Specific (1993-2002)
9
08-24-15 02:07 PM
