Speed Sensor DTC comes on after hard launch, car doesnt shift
Speed Sensor DTC comes on after hard launch, car doesnt shift When I made my first pass at the track after having my transmission rebuilt, I cut a 1.75 60' and it took off great, but it wouldn't shift into 2nd until I lifted. Datamaster stoped reading mph and the window lit up with a DTC from the transmission. The DTC's I get are:
22-TPS Sensor Low
72-Output Speed Loss
I reset the computer and it ran fine on the next pass.
That was 3 months ago and today I'm in Maryland for the Super Chevy Show doing test and tune. I decided to spray a 50 shot off the line to see if I could lift the wheels (which I did!) and it left hard, cutting a 1.649 60' and wouldn't shift into second, the datamaster started beeping again with the same DTC. I reset the computer and its running great again.
Why would my speed sensor crap out on a hard launch? What can I do to prevent this? Could anything have gone wrong durin the rebuild that would cause this?
22-TPS Sensor Low
72-Output Speed Loss
I reset the computer and it ran fine on the next pass.
That was 3 months ago and today I'm in Maryland for the Super Chevy Show doing test and tune. I decided to spray a 50 shot off the line to see if I could lift the wheels (which I did!) and it left hard, cutting a 1.649 60' and wouldn't shift into second, the datamaster started beeping again with the same DTC. I reset the computer and its running great again.
Why would my speed sensor crap out on a hard launch? What can I do to prevent this? Could anything have gone wrong durin the rebuild that would cause this?
Last edited by LS1Transam99; Apr 28, 2006 at 09:35 PM.
Originally Posted by infinitebird
sounds like the obd1 high stall problem. apparantly ed wright, pcmforless, etc. can fix it. I've heard conflicting reports on that though.
A popular fix is to convert to obd2.
A popular fix is to convert to obd2.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Guys let me tell you a story many know. We fought this issue for years. We spent Thousands on it to the point a friend and I pioneered the OBD-II swap.
Not everyone wanted to swap so we kept testing.
Ed here took it upon himself to put a huge stall in his car and start testing the code one piece at a time. He is the Master and can work in areas of the code no one would help us with.
One day Ed shoots me a file and Says "try this" We stuffed it in a 10 second N2O car and right out of the gate it cut a 1.3 60ft and ran a solid ten second pass! We were aprehensive I will admit. banging you $10k motor off the limiter on juice scares the hell out of you that is for sure!
Alot of people were pissed off at me because I made a deal with Ed to NOT share the code and to this day I have pointed people back to him every time it comes up.
What can I says I am a man of my word and he did what no one else could or WOULD at the time. ANY tune that works for this is a copy of his code. I would rather he getts the money for what he engineered
Ed can fix your car, ask him what it will take
BTW 1.52 60fts tires up Launches last week on Dr radials!
Not everyone wanted to swap so we kept testing.
Ed here took it upon himself to put a huge stall in his car and start testing the code one piece at a time. He is the Master and can work in areas of the code no one would help us with.
One day Ed shoots me a file and Says "try this" We stuffed it in a 10 second N2O car and right out of the gate it cut a 1.3 60ft and ran a solid ten second pass! We were aprehensive I will admit. banging you $10k motor off the limiter on juice scares the hell out of you that is for sure!
Alot of people were pissed off at me because I made a deal with Ed to NOT share the code and to this day I have pointed people back to him every time it comes up.
What can I says I am a man of my word and he did what no one else could or WOULD at the time. ANY tune that works for this is a copy of his code. I would rather he getts the money for what he engineered
Ed can fix your car, ask him what it will take
BTW 1.52 60fts tires up Launches last week on Dr radials!
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I e-mailed Jeff Creech at Carolina Auto Masters since I already have free updates from him. He said he had a fix for this as well and he'll have it e-mailed to me by tuesday hopefully
Incidently, I had a 1.68 60' today without the nitrous and the car shifted fine. I guess launching of somethin as small as a 50 shot is enough to freak the PCM out.
Incidently, I had a 1.68 60' today without the nitrous and the car shifted fine. I guess launching of somethin as small as a 50 shot is enough to freak the PCM out.
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I had issues with BHs high stall fix (figured i'd be unlucky and have the OBd1 high stall issues) quick shifting out of 1st gear for no reason, so I had him remove the High stall fix, and I haven't had a problem yet. Although my best 60ft so far is only a 1.84
