tach not working???

Mateepay · 10-21-2010, 09:47 PM

i need some help ive replaced the tachometer in my 83 rx and havent had any luck getting it to work..... it spikes a inch on start up and wen i do a cold rev engine shutoff.... im loosing patience with this does anyone know of a possible fusible link or anything im missing that will get this working??

FC Zach · 10-21-2010, 09:52 PM

Is your trailing coil good? Was it working fine prior to the swapping?

Mateepay · 10-21-2010, 09:54 PM

the car runs and drives fine anyway to tell wether the trailing is good?

Mateepay · 10-21-2010, 09:56 PM

and the cars tach hasnt ever worked since i bought the car in may

FC Zach · 10-21-2010, 10:46 PM

Quote:

Originally Posted by Mateepay

the car runs and drives fine anyway to tell wether the trailing is good?

If you have an OHM meter you can measure the resistance between the primary (+ & -) which should be around 0.1 on your coil but I'm not exactly sure on the specifics, if you have a Haynes it is in there.

FC Zach · 10-21-2010, 10:50 PM

If it hasn't worked since you purchased the car then there is a chance that the Yellow/Green tracer wire (i think green tracer) may not be connected, but then again you did state that the needle does jump. ? ? ? weird

Edit: The yellow/green tracer wire is the signal wire for the tach.

Mateepay · 10-21-2010, 11:10 PM

I believe every wire that needs to be connected is. distributor and coil connection. My car back fires alot and I mean alot could that be an attribute of no trailing plug ignition or poor ignition becouse of a bad coil?

Kentetsu · 10-22-2010, 02:00 AM

Pull a trailing spark plug out and check for spark (keep it away from the fumes that will exit the plug hole when you crank it over). Could be a bad coil, or ignitor.

.

t_g_farrell · 10-22-2010, 07:14 AM

Move the coil signal wire from the trailing to the leading coil and see if that
helps your tach.

With all the backfiring you either have a spark issue or a fuel issue or both.
If you can rule out the spark then you can work on the fuel. Kind of hard to
deal with a fuel issue tho ift he spark is unknown quantity.

Mateepay · 10-22-2010, 09:19 AM

Checked the trailing plugs and didn't get anything so maby my problem lies with the coils going to get some today if that doesn't solve the problem with the tach I guess that would leave the wire

rx4ur7 · 10-22-2010, 10:06 AM

Check your ignitors first.

Mateepay · 10-23-2010, 02:02 PM

pUt the new coil in... Nothing pulled some used ignitirs guess that's my next try

Mateepay · 10-23-2010, 09:56 PM

trailing ignitor was the issue!!! thanks for the help now....... to takle the delorto carb and sidedraft set up

10-21-2010, 09:47 PM	#1
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	tach not working??? i need some help ive replaced the tachometer in my 83 rx and havent had any luck getting it to work..... it spikes a inch on start up and wen i do a cold rev engine shutoff.... im loosing patience with this does anyone know of a possible fusible link or anything im missing that will get this working??

10-21-2010, 09:52 PM	#2
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	Is your trailing coil good? Was it working fine prior to the swapping? __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-21-2010, 10:50 PM	#6
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	If it hasn't worked since you purchased the car then there is a chance that the Yellow/Green tracer wire (i think green tracer) may not be connected, but then again you did state that the needle does jump. ? ? ? weird Edit: The yellow/green tracer wire is the signal wire for the tach. __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-22-2010, 02:00 AM	#8
Kentetsu RCC Contributor Join Date: Feb 2008 Location: Grand Rapids, Michigan Posts: 530 Rep Power: 18	Pull a trailing spark plug out and check for spark (keep it away from the fumes that will exit the plug hole when you crank it over). Could be a bad coil, or ignitor. . __________________ "Learn from the past, or it will become your future...." '85 GS 12a + LSD/Sterling carb/Respeed coilovers/Respeed front swaybar/Respeed adj. rear spring perches/Illuminas/Bilsteins on rear AutoX vids @ http://www.youtube.com/user/Kentetsu1

10-22-2010, 07:14 AM	#9
t_g_farrell Waffles - hmmm good Join Date: Aug 2008 Location: Huntersville, NC Posts: 757 Rep Power: 0	Move the coil signal wire from the trailing to the leading coil and see if that helps your tach. With all the backfiring you either have a spark issue or a fuel issue or both. If you can rule out the spark then you can work on the fuel. Kind of hard to deal with a fuel issue tho ift he spark is unknown quantity. __________________ 1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00

10-21-2010, 09:54 PM	#3
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	the car runs and drives fine anyway to tell wether the trailing is good?

10-21-2010, 09:56 PM	#4
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	and the cars tach hasnt ever worked since i bought the car in may

10-21-2010, 11:10 PM	#7
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	I believe every wire that needs to be connected is. distributor and coil connection. My car back fires alot and I mean alot could that be an attribute of no trailing plug ignition or poor ignition becouse of a bad coil?

10-22-2010, 09:19 AM	#10
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	Checked the trailing plugs and didn't get anything so maby my problem lies with the coils going to get some today if that doesn't solve the problem with the tach I guess that would leave the wire

10-22-2010, 10:06 AM	#11
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Check your ignitors first.

10-23-2010, 02:02 PM	#12
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	pUt the new coil in... Nothing pulled some used ignitirs guess that's my next try

10-23-2010, 09:56 PM	#13
Mateepay Rotary Fan in Training Join Date: Jun 2010 Location: tulsa, ok Posts: 71 Rep Power: 16	trailing ignitor was the issue!!! thanks for the help now....... to takle the delorto carb and sidedraft set up