T-REX troubles
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Joined: Mar 2004
Posts: 17
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From: FT Worth TX
T-REX troubles Has anyone had problems with this cam throwing codes?? Keeps throwing codes for the maf and throttle position sensor out of range performance, and o2 slow response and switching....Any feedback would be appreciated...I have changed the maf and o2's....still recieving codes 
Originally Posted by SSactionLs1
can you explain the "open loop"?
thanks mikey
thanks mikey
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Mikey.. It is not impossible to tune the TREX using the standard MAF style tune. It just takes a lot of time. To someone that is not familar with Mafless tuning, I would not suggest that to them. A budy of mine just did his own here in San Jose. He was not throwing codes when it started.
Look for some Danz28 posts as he did have a couple issues with things like down shifting problems and converter lock up once he went from the TR230 to the T-REX.
Look for some Danz28 posts as he did have a couple issues with things like down shifting problems and converter lock up once he went from the TR230 to the T-REX.
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Originally Posted by mikey
With that sized cam, you need to disconnect the O2 sensors and tune it open loop. There's no other way.
As for the TP code,we were getting it and actually fixed it with an idle rpm change.The 02's also came in for switching,that was cleared up with more leaning on the idle.
Originally Posted by BuckarooZ28
Has anyone had problems with this cam throwing codes?? Keeps throwing codes for the maf and throttle position sensor out of range performance, and o2 slow response and switching....Any feedback would be appreciated...I have changed the maf and o2's....still recieving codes
it runs great with my foot to the floor though.
or you can do what mikey said, tune it open loop.
Originally Posted by mikey
With that sized cam, you need to disconnect the O2 sensors and tune it open loop. There's no other way.
11 Second Club
Joined: Dec 2002
Posts: 1,498
Likes: 10
From: long island, ny
yo a friend of mine has this cam with a 6 speed
idle is set at 975, no codes what so ever, goes into closed loop, does not load up, no hot or cold start problems
if you have it tuned by people who know what they are doing it will me nice
idle is set at 975, no codes what so ever, goes into closed loop, does not load up, no hot or cold start problems
if you have it tuned by people who know what they are doing it will me nice