need help, did fast 92mm upgrade
Thread Starter
Instructor
Joined: Jan 2008
Posts: 129
Likes: 1
From: Utica NY
need help, did fast 92mm upgrade
just did a fast 92mm and ported ls2 TB and as soon as i turn the key on i im getting "reduced engine power". im getting codes p1120,p1220 and p1516. does the TB sound like its broken? i did a search but couldnt really find if the car needs to be tuned first.
Drifting
Joined: Feb 2008
Posts: 1,765
Likes: 2
From: St. Clair Shores Mi
those codes are tb related
P1516 Command vs Actual Throttle Position Performance (TAC Module)
P1220 TP Sensor 2 Circuit
P1120 TP Sensor 1 Circuit
P1516 Command vs Actual Throttle Position Performance (TAC Module)
P1220 TP Sensor 2 Circuit
P1120 TP Sensor 1 Circuit
Last edited by slothy; Mar 2, 2009 at 03:51 PM.
Racer
Joined: Feb 2007
Posts: 328
Likes: 0
From: Orange County California
You have a problem with the connection at the TB. Carefully un-pin the connector one at a time, so you don't mix up the order, and solder each connection. The apply some dieletric grease to the connector before plugging it back in. I have seen this problem more than a few times and this usually seems to take care of it. I learned this fix from a GM engineer.
Justin
Justin
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Racer
Joined: Feb 2007
Posts: 328
Likes: 0
From: Orange County California
I assumed you had everything connected in my previous post. If you happened to overlook the throttle position connection on the adapter harness this would happen.
Racer
Joined: Aug 2007
Posts: 444
Likes: 6
From: Richmond Texas
Mine did it too, it is the TB. There is a table that needs to be increased to adjust for the added air flow at idle. I wish I could remember which one. But basically your PCM thinks your blade is stuck open due to the increase in air and is basically shutting down to prevent damage or an accident. It is a tuning issue, and yes some cars do this and some do not. The LS2 TB's seem to do it the least, I happen to have a TPIS which was common for this issue
Safety Car
Joined: Oct 2007
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