odd tach problem

Post by **ceniack** » Tue Nov 21, 2006 1:07 pm

k, i have searched like a madman for two days, i have the car starting, running, idling perfectly, etc...

however, my tach has a mind of its own. it shows proper idle, and the proper RPMs untill about 3krpms, then it just goes nuts and goes all the way to redline, it almost seems to coinside with how much throttle i am giving it/the sound of the turbo.

not sure what in the hell the deal is

would really like to figure out what rpm i am running in so i can properly diagnose any problems i may be having with the new swap. as she feels a little sluggish

Post by **c-rad** » Tue Nov 21, 2006 1:12 pm

Mine did that when my ignitor was dying.

Post by **ceniack** » Tue Nov 21, 2006 1:20 pm

the sluggish part, the tach part, or both?

-terry

*edit*

and the q45 ignitors are direct plug and play right? (i haev searched but get differeing ansers
Modified by ceniack at 1:17 AM 11/22/2006

Post by **c-rad** » Tue Nov 21, 2006 2:22 pm

First it was just the tach being skiddish. But then after a couple days the car started bogging and misfiring when the rpms went up over 2500 or so.

Post by **float_6969** » Wed Nov 22, 2006 4:30 am

You're not using a SOHC KA tach are you?

Post by **ceniack** » Wed Nov 22, 2006 7:00 am

nope

and a new ignitor didn't fix it...
Modified by ceniack at 1:07 PM 11/22/2006

Post by **r34 gtr** » Wed Nov 22, 2006 12:08 pm

i had my sohc ka tach hooked up for a while and it always worked fine. so did the tack on my CA cluster, and the tach on my current HUD. strange it isnt supposed to work...

my tach used to go crazy and i had my way with the ignitor and its fine now. it started running terribly after a few days, just like c-rad's.

Post by **Hillkill** » Wed Nov 22, 2006 8:37 pm

I would like to know if anyone has ever had a bad ignitor? I had to use a diode setup directly off the ignitor to get my tach in the s12 working. Was fine until the little diodes broke and the car missfired like hell and sputtered to a dead stop. But All I had to do was just break off the diodes. Does a single cam KA tach work ?

Post by **ceniack** » Tue Feb 27, 2007 9:10 pm

so far two different ignitors havn't fixed the problem, and other than that, the car runs just fine, so i am not sure what the problem is. (finally warm enough again and life has slowed down enough to mess with the car)

Post by **ca18datsun510** » Wed Feb 28, 2007 2:27 am

check your grounds.

Post by **float_6969** » Wed Feb 28, 2007 5:26 am

Yea, it sounds like you're getting a voltage bleed into the signal for the tach. Maybe you've got a bad connection at a ground, or the signal wire for the tach is rubbed through somwhere.

Post by **Masterdebater** » Wed Feb 28, 2007 11:33 am

none of my gauges work lol cuz i have the single cam ka cluster. r34, ur sohc ka tach works?! i had a shop wire mine all up but they said i need a dohc ka cluster for it to work :?

Post by **ca18datsun510** » Wed Feb 28, 2007 3:05 pm

the only thing that would matter is the tach.

speedo runs off the trans, fuel gauge runs off the fuel sender, temp runs off the temp sensor, based on resistance.

Post by **Masterdebater** » Wed Feb 28, 2007 3:09 pm

well yea my tach and speedo are the only things that dont work. i have a HUD and i dont know how to get it all to work...

Post by **ceniack** » Wed Feb 28, 2007 4:00 pm

would i be correct in assuming that it is between the ECU and the cluster since the car runs just fine?

Post by **Masterdebater** » Wed Feb 28, 2007 4:41 pm

or pull the cluster to take a look behind it?check under the kick panel where the ecu connects up to the little white connector and see if its all connected nice

Post by **float_6969** » Wed Feb 28, 2007 5:52 pm

I'm running a SOHC speedo and it works fine. IDK if that holds true for the HUD though. You should have just used your KA speed sensor, so that shouldn't be an issue. As for the tach, I was pretty sure you had to use a DOHC tach. I'm using the 9K rpm tach that came with my clip.

Post by **Masterdebater** » Wed Feb 28, 2007 8:39 pm

yea i picked up a sr speed sensor today cuz mine was clipped on the ca so ill put it on tomorrow... my car is running real weird tho like it bogs down and revs normal then keeps going up down up down up down when i come to a stop but it doesnt die. when i rev it to move it revs smooth like theres no prob. im sure its timing i havnt had time to give it an accurate timing but maybe cuz i removed them cam angle sensor maybe i put it on wrong?

Post by **Masterdebater** » Thu Mar 01, 2007 1:25 pm

i finnally got it timed and it runs a lil better. im at 15 deg.honestly im not sure which sensor is the coolant temp sensor...their is however a sensor in my lower rad. hose that i havnt hooked up cuz i didnt think u needed it but if i were to take a guess...id say that is the coolant temp sensor. im thinking it is just a sensor because when the car is cold it runs just fine (besides startup, these injectors flood pretty bad :/) but once it warms up then the ecu starts reading the sensors and it starts "bounce idling"

Post by **ca18datsun510** » Thu Mar 01, 2007 2:39 pm

that sensor in the lower hose is for the ka. you dont need it anymore.

the temp sensors of concern on the ca are on the front of the intake manifold, on top, close to the head. one is a 2 pin bosch connector, thats the one for the ecu. the other is a one pin spade connector, thats the one for the gauge in the cluster.

you want a ka speed sensor, if you car was an original manual, you should have just put the stock one in the ca trans. sr and ca one will work, but will be off in the reading. if your speedo doesnt work at all, thats something else, and common with hud.

Post by **r34 gtr** » Thu Mar 01, 2007 3:45 pm

single cam ka wont work. im using a dohc HUD (poor man's stack cluster!) and it works great. sometimes when the car is cold my tach will bounce around and stuff, but it settles down when it warms up a little. im having a little issue with the speedo because the wire coming from the ecu is a little loose and ive been too lazy to fix it. if your HUD speedo isnt working, its probably dead. they go out all the time and it costs a fortune to replace them.

Post by **Masterdebater** » Thu Mar 01, 2007 7:11 pm

no my hud works and always has but its just readin 0mph because my ca speed sensor wiring was clipped lol.i know the sr one will be off on the reading but i just wanna know roughly what speed im running lol. what about for the tach do i need a dohc ka one?

Post by **float_6969** » Thu Mar 01, 2007 7:12 pm

IIRC, the speed signal goes to the cluster and then to the ECU...

Post by **ca18datsun510** » Thu Mar 01, 2007 7:32 pm

Masterdebater wrote:no my hud works and always has but its just readin 0mph because my ca speed sensor wiring was clipped lol.i know the sr one will be off on the reading but i just wanna know roughly what speed im running lol. what about for the tach do i need a dohc ka one?

i feel like this is just going around in circles

speedo is the same for ka-e, ka-de, sr, catemp gauge is the same for ka-e, ka-de, sr, cafuel gauge is the same for ka-e, ka-de, sr, catach ka-de, ca, and sr are the same. ka-e is different and not supposed to work.

Post by **Masterdebater** » Thu Mar 01, 2007 8:15 pm

nah the sohc can work somehow my friend ran his sr on the sohc tach for awhile. dont feel like ur running in circles lol ur the one choosing to run but any input or info is appreciated cuz u guys know alot more about the ca than i do obviously. i wouldnt ask questions if i didnt want answers.ive been on another forum for awhile and this forum operates a lil diferent so ill get used to how u guys give info to eachother lmao

Post by **ceniack** » Tue Mar 20, 2007 8:38 pm

k,, still having the tach issue, i am going to double check the grounds again, but is there a way i can check and see if i am getting the proper voltage out of the ECU to eliminate the possibility of the problem being in my dash?

i have directly connected the tach signal output (pin 7 i think, they yellow and red wire) directly to the plug that goes to the dash and i still have the problem.

only above ~3000-3500rpms and if i let off the gas, the RPMs drop to where they should be...

i have searched all over the place and i have seen a few posts with a couple guys having the same problem, but no solutions.

shurly my tach didn't just coincidently go bad in the middle of the swap

Post by **ceniack** » Wed Mar 21, 2007 5:46 am

fixed it, when above and below the engine bay, found a couple grounds that were some how wedged between the transmission and the chassis. hooked them up, BOOOM!!! problem solved.

thanks for all the help guys

odd tach problem

odd tach problem

Re: (c-rad)

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Re: (float_6969)

Re: (r34 gtr)

Re: (Hillkill)

Re: (ceniack)

Re: (ca18datsun510)

Re: (Masterdebater)

Re: (ceniack)

Re: (float_6969)

Re: (Masterdebater)

Re: (r34 gtr)

Re: (Masterdebater)

Re: (ca18datsun510)

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Re: odd tach problem (ceniack)

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