Another "Tach PRoblem" Thread

[Breitling]

I have searched and tried some of the remedies that I found… but am still having issues.

My car, 1995 s14 with s13 redtop.

My Tach just stopped working all of a sudden…. And then kicks on intermittently (I think when we jiggle the wiring at the ECU).

Here’s what we’ve tried (took it to a local shop, because I know jack shit about wiring).

1. We swapped in a borrowed cluster (because of the thread about the tach solder needing to be re-flowed), no dice
2. We checked the coil ground on the coilpack and it was nice and clean/grounded.
3. We checked all wires (#3 on ECU pin) and all looked good
4. I borrowed a 62# ECU and the car wouldn’t even fire.. .come to find out the kid I borrowed it from said it was a blacktop ECU, is this possible?

Here are my assumptions:
1. The tach is fine
2. The wiring around the ECU is good… BUT, maybe where it connects/splices to the s14 body harness is bad?
3. The ECU may be bad… but would it work intermittently if it were bad?

Here are my questions:

1. Does anyone have a harness conversion diagram that I can give to the shop (they requested it) that shows the s13 engine harness linking up to the s14 body harness?
2. What color on the s14 cluster is the tach signal wire?
3. What wire does the #3 ECU pin (red/yellow) connect to on the s14 body harness?

[Breitling]

Update, found that the tach wire is Yellow/Red at the ECU but Blue/black at the cluster plug. Can someone confirm this?


Bump also PLZ.

[jakins]

Yes that's absolutely correct! Now you just need to find out which pin on the sr20 Ecu is the tachometer signal. Did you ever try the re soldering trick on the back of the cluster? It seems to work in almost every single case. As long as you are wired up correctly from there to there, I'm sure that's your problem. Very easy fix

[jakins]

http://zilvia.net/f/tech-talk/355077-so-i-beleive-i-just-solved-infamous-s14-tach-glitch.html