after installing window switch....
Thread Starter
Intermediate
Joined: Apr 2005
Posts: 33
Likes: 0
From: dublin ohio
after installing window switch....
i was wondering if any of you guys have ran into this problem. after i installed my msd digital window switch. when driving or reving, the tach will jump\drop a lot at certain rpms. the car still seems to run fine. i have the msd connected to the #10 pin white wire off the ecu. and it's soldered nicely. any clues?
Le Mans Master
Joined: Aug 2001
Posts: 7,064
Likes: 18
From: Arizona
Originally Posted by SPRAYN99
i was wondering if any of you guys have ran into this problem. after i installed my msd digital window switch. when driving or reving, the tach will jump\drop a lot at certain rpms. the car still seems to run fine. i have the msd connected to the #10 pin white wire off the ecu. and it's soldered nicely. any clues?
Melting Slicks
Joined: Apr 2005
Posts: 3,418
Likes: 1
From: Chicagoland Area IL
Soldering is the better way to go.
If you don’t have a cold solder joint (mat finish/no shine) then there should be no issue. Just wondering what kind of solder did you use?
Anyway, stray capacitance can cause false readings. Try redoing wiring and see if problems go away.
If you don’t have a cold solder joint (mat finish/no shine) then there should be no issue. Just wondering what kind of solder did you use?
Anyway, stray capacitance can cause false readings. Try redoing wiring and see if problems go away.
Thread Starter
Intermediate
Joined: Apr 2005
Posts: 33
Likes: 0
From: dublin ohio
at first i did have a tap connector on it. then i thought that might have been causing it, so i just soldered it using the normal rosin core solder i use on everything else at work (i'm a bmw tech). i haven't had a chance to see if the rpm's jump on the msd yet. if they don't i probably won't worry about it.
Advanced
Joined: Nov 2004
Posts: 62
Likes: 0
From: Colorado Springs CO
Its a bad connection. Eventually your tach will fully stop functioning like mine did. And after you hook it back up you have to reset your computer before the tach will work again. I suggest Hooking up just the tach wire with no msd, just make sure you have a good connection you dont have to solder it. Then start the car and make sure it is fine, if it is fine then that means it was just a bad connection, if not that means the pin into the computer is bad. I had problems with the connection to the window switch as well, make sure you use the same gauge wire at least on the connection and you should be fine.
Instructor
Joined: Sep 2003
Posts: 129
Likes: 0
From: Nassau County NY
On a related note, can one tap into the pcm tach wire to, say, hook up your window switch, then tap into the window switch's wire (the one now tapped into the pcm tach wire) to add a second tach or other device that needs a tach signal? Just curious as to whether there would be any signal degradation that would impede the second device from sensing the tach signal....
Last edited by ChrisLe; Apr 29, 2005 at 06:21 PM.
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
Originally Posted by ChrisLe
On a related note, can one tap into the pcm tach wire to, say, hook up your window switch, then tap into the window switch's wire (the one now tapped into the pcm tach wire) to add a second tach or other device that needs a tach signal? Just curious as to whether there would be any signal degradation that would impede the second device from sensing the tach signal....
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Instructor
Joined: Sep 2003
Posts: 129
Likes: 0
From: Nassau County NY
Originally Posted by Robert56
Yes you can. I did this tapped #10 ran to behind batt and then split to two different WS tach inputs. Both WS's work correctly and dash board tach and HUD tach.