TCS is acting weird lately...
Thread Starter
TECH Fanatic
iTrader: (5)
Joined: Mar 2002
Posts: 1,645
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From: Palm Coast, FL
TCS is acting weird lately... In the past few days my TCS after driving for a while suddenly stops working and the light TCS off goes on. The switch doesn't work. There is power to it since the light is on when I put the parking lights on. I just recently had the car tuned since I added a TSP 231/237 cam. I checked the connections and everything seems fine. Any ideas?
TECH Enthusiast
Joined: Feb 2003
Posts: 596
Likes: 1
From: Austin, TX
I notice mine does this too, and I figure its related to the code p0121. Everytime my TCS turns itself off, I check and that code has been thrown. I still don't know what to do about that code. All the searching I do, people just relaly recomend bad sensors, which I know they arent.... :shrug:
I have like problem , on begain after install same cam , I did adjust misfires at low rpms , and correct problem 90 per of time now only come on after cold start if let idle 20-30 minutes at very low idle ( 625-875) but if drive 10-15 minutes all work ok
my .02 Johnny
my .02 Johnny
https://ls1tech.com/forums/showthrea...ighlight=P0121
https://ls1tech.com/forums/showthrea...ighlight=P0121
https://ls1tech.com/forums/showthrea...ighlight=P0121
https://ls1tech.com/forums/showthrea...ighlight=P0121
Big cam = less vacuum = higher MAP. The ECM does a speed density check against MAF readings using the MAP/IAT/etc - when the MAP is skewed it makes the speed density reading wrong and it doesn't jive with the MAF reading, hence the throttle position sensor code.
Fix is to change (increase values by 10) the MAP window on P0121 code.
Raising the idle or reducing parasitic drag may also help mask the issue.
Happy driving,
Bad30th
https://ls1tech.com/forums/showthrea...ighlight=P0121
https://ls1tech.com/forums/showthrea...ighlight=P0121
https://ls1tech.com/forums/showthrea...ighlight=P0121
Big cam = less vacuum = higher MAP. The ECM does a speed density check against MAF readings using the MAP/IAT/etc - when the MAP is skewed it makes the speed density reading wrong and it doesn't jive with the MAF reading, hence the throttle position sensor code.
Fix is to change (increase values by 10) the MAP window on P0121 code.
Raising the idle or reducing parasitic drag may also help mask the issue.
Happy driving,
Bad30th
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