Page 1 of 2 12 LastLast
Results 1 to 20 of 23

Tach, TCS and shift issues

This is a discussion on Tach, TCS and shift issues within the General Help forums, part of the LSx Technical Help Section category; So my wife ran my 98 WS6 out of gas and apparently, this causes the fuel pump to fail. The ...

  1. #1
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46

    Tach, TCS and shift issues

    So my wife ran my 98 WS6 out of gas and apparently, this causes the fuel pump to fail. The car wouldn't start so I had it towed to a show to figure out what was up and while it was there had them service the auto trans and differential. As a courtesy, they "steam cleaned" the engine (although I think it was more of a pressure clean than steam).

    When I picked the car up today I backed out of the parking stall, put it into drive and it shifted into drive quicker than before and MUCH harder. I let them know this wasn't normal. I didn't notice it, but they asked me if the tach had worked previously because it wasn't working either (they could read the rpm's from the computer, just no guage). Additionally, the TCS light is on and TCS will not engage.

    So, three new problems, no tach, hard shifting between gears (while driving too), and no TCS.

    They checked all the fuses and replaced some kind of sensor inside the trans (removed the pan and the sensor is right there, not sure what it is).

    I'm now being referred to another shop that does electrical work. The shop owner said he would pay for anything that they may have done to cause this, but I wanted to post here to see if anybody had experienced this before.

    Any ideas?

    Thanks,

    Bob

  2. #2
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,725
    Man I don't have a clue. Is it throwing any codes? Hard shifts could mean the trans is in "limp mode." Did they replace the fuel pump/remove the rear?

  3. #3
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by 2001NBMZ28 View Post
    Man I don't have a clue. Is it throwing any codes? Hard shifts could mean the trans is in "limp mode." Did they replace the fuel pump/remove the rear?
    Yes, it's throwing a code. I just called them and the code is PO743 (Pressure Control Solenoid). They replaced the Pressure Control Solenoid so the shop is confident that's not really the problem.

    They did replace the fuel pump. When you say "remove the rear," are you talking about the rear end? They did mention that the rear had to be dropped to do the pump, but quite frankly, I wasn't sure whether they really had to do that or it was a way of justifying the amount of money they wanted to do it.

  4. #4
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,725
    OK well that code I'm not finding - sure it's P0743? Maybe P0758 or P0753 or something else? I'd have that checked to be sure (auto zone will read it free). If they removed the rear to do the pump one of the TCS/ASR sensors at the rear wheels probably isn't plugged in all the way causing the traction control problem. Don't know why the tach is inop?

  5. #5
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by 2001NBMZ28 View Post
    OK well that code I'm not finding - sure it's P0743? Maybe P0758 or P0753 or something else? I'd have that checked to be sure (auto zone will read it free). If they removed the rear to do the pump one of the TCS/ASR sensors at the rear wheels probably isn't plugged in all the way causing the traction control problem. Don't know why the tach is inop?
    That's definitely the code they gave me. Maybe I'll stop at AZ and have them read it for me just to be sure.

    Can you guide me to where I might find the TCS/ASR sensors you're speaking of? If they're exposed connections, I'll get under there and check it myself.

    Thanks for the input!

  6. #6
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    It's not an easy task since I have the Eibach Sportsline springs on the car, but just got under there to take a look and I see connectors on each side. They seemed like they're plugged in. Ugh...

  7. #7
    Junior Member T/A Syco's Avatar
    Join Date
    May 2006
    Location
    NY
    Age
    39
    Posts
    30

    Pewter
    2000 Trans Am WS6

    Just had a similar problem... Shifting all out of whack, high idle, and TCS off..... I had water in the TPS sensor on the Throttle Body... Give it a shot and check that out...

  8. #8
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by T/A Syco View Post
    Just had a similar problem... Shifting all out of whack, high idle, and TCS off..... I had water in the TPS sensor on the Throttle Body... Give it a shot and check that out...
    This could make some sense since he pressure washed the engine. Where's the TPS sensor (sorry, my tech knowledge is very, very limited)?

    Thanks.

  9. #9
    Junior Member T/A Syco's Avatar
    Join Date
    May 2006
    Location
    NY
    Age
    39
    Posts
    30

    Pewter
    2000 Trans Am WS6

    drivers side of the throttle body.... the top plug is your idle solenoid, the bottom is the tps... two screws hold her on... take it off (it's notched to go back on correctly) and tap the it in your hand... if you see some water on the inside of the sensor, let her dry up and slap it back on... Hopefully this helps you out..

  10. #10
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Excellent, thanks!

  11. #11
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Well, no water came out of it at all when I tapped it. Is only the plastic housing supposed to come out, or should the metal piece with the keyed spindle (or whatever it's called) come out too?

  12. #12
    Member TACE02's Avatar
    Join Date
    Aug 2005
    Location
    Texas
    Age
    40
    Posts
    568

    ASC #753
    2002 Collector's Edition

    Just curious, was it a dealership you took it to???
    Seems like they did something wrong for sure.
    And shifting hard after they serviced the tranny???

  13. #13
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by TACE02 View Post
    Just curious, was it a dealership you took it to???
    Seems like they did something wrong for sure.
    And shifting hard after they serviced the tranny???
    No, it wasn't a dealership and I'm kicking myself in the butt for not just bringing it to one.

  14. #14
    Member TACE02's Avatar
    Join Date
    Aug 2005
    Location
    Texas
    Age
    40
    Posts
    568

    ASC #753
    2002 Collector's Edition

    I hear ya, live and learn. I give ppl 1 chance and thats it. Mess up I go elsewhere. Unless of course it was a common/simple mistake and they fix it. Nothing beats a shop that stands by their work.


  15. #15
    Junior Member T/A Syco's Avatar
    Join Date
    May 2006
    Location
    NY
    Age
    39
    Posts
    30

    Pewter
    2000 Trans Am WS6

    Quote Originally Posted by Bob Savage View Post
    Well, no water came out of it at all when I tapped it. Is only the plastic housing supposed to come out, or should the metal piece with the keyed spindle (or whatever it's called) come out too?
    nope... Just the plastic piece is the sensor... Any luck after putting her back on ??

  16. #16
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by T/A Syco View Post
    nope... Just the plastic piece is the sensor... Any luck after putting her back on ??
    Unfortunately, all is still the same.

  17. #17
    Junior Member
    Join Date
    Sep 2006
    Location
    s.e. ma
    Age
    63
    Posts
    22

    primer
    65 nova

    bob
    the pressure control soleniod is a device that controls transmission line pressure and is pulse width modulated (turned on and off) by the pcm. when the pcs looses power it defaults to full line pressure=very hard shifts. the same fuse(eng ctrl-under hood fuse box 2)that powers the pcs also controls the shift solenoids you didn't say if the trans still shifted through the forword gears if the trans looses power it will only have third gear

  18. #18
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by newtechnova View Post
    bob
    the pressure control soleniod is a device that controls transmission line pressure and is pulse width modulated (turned on and off) by the pcm. when the pcs looses power it defaults to full line pressure=very hard shifts. the same fuse(eng ctrl-under hood fuse box 2)that powers the pcs also controls the shift solenoids you didn't say if the trans still shifted through the forword gears if the trans looses power it will only have third gear
    Hey NTN (I had a 69 SS Nova when I was still in my teens),

    The trans does shift through all the gears. First is VERY hard, second is hard but less than first, and of course the next two shifts are fairly smooth, though I figure that's because the car is moving and absorbs some of the shift shock. It's reminding me of the transmissions some of my friends had back in the early 80's. I'm getting a wicked chirp into second if I get on the gas a little.

  19. #19
    Junior Member
    Join Date
    Sep 2006
    Location
    s.e. ma
    Age
    63
    Posts
    22

    primer
    65 nova

    bob
    that fact that your tranny shifts means that it it getting battry voltage its possible that the repair shop knocked the connector off the pressure control solenoid when they removed or installed the trans pan

  20. #20
    Junior Member
    Join Date
    Mar 2006
    Location
    OC CA
    Posts
    46
    Quote Originally Posted by newtechnova View Post
    bob
    that fact that your tranny shifts means that it it getting battry voltage its possible that the repair shop knocked the connector off the pressure control solenoid when they removed or installed the trans pan
    Is the pressure control solenoid on the inside of the trans?

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •