No speedo, rev lockout HELP
Thread Starter
TECH Regular
Joined: May 2013
Posts: 467
Likes: 2
From: Lincoln NE
No speedo, rev lockout HELP I just got my project up and running last week. Couple nights ago I sat in traffic with the car for a solid 30 minutes not moving much. When we finally started moving I noticed my speedo quit working. The first stop light there after the car died. Took it home parked it in the garage and noticed the rev lockout won't unlock. Replaced the transmission speed sensor this morning with no luck. ALSO noticed that the electric fans are always on when I start it. Also the Rpms dive between shifts when I drove it. I reset the battery and started it and it was normal for maybe a block and problems represented themselves. Would love some insight from you guys. Thanks!
TECH Enthusiast
Joined: Mar 2009
Posts: 680
Likes: 7
From: Clearwater
You should have a check engine light if the fans are constantly running so go have it scanned for codes.
A friend of mine had a similar issue when he swapped to a TH400 (from a T56) without all the parts for the speed sensor so he left it unplugged. The car ran like crap under any kind of load (deceleration fuel cut off?) because the PCM always thought it was travelling 0 mph. We stuck it to either the side of the transmission pan or the floorboard (forget which one) and went from always reading 0 to something insane like 255 mph until he was able to get the speedo working with the transmission. I am not saying to do this and leave it that way but at least see if it helps.
A friend of mine had a similar issue when he swapped to a TH400 (from a T56) without all the parts for the speed sensor so he left it unplugged. The car ran like crap under any kind of load (deceleration fuel cut off?) because the PCM always thought it was travelling 0 mph. We stuck it to either the side of the transmission pan or the floorboard (forget which one) and went from always reading 0 to something insane like 255 mph until he was able to get the speedo working with the transmission. I am not saying to do this and leave it that way but at least see if it helps.
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