Strange Tachometer Issue

Jukelemon · 05-15-08, 11:06 AM

Hi all.

On the way home today, I noticed that at IDLE my tach showed 0 rpms BUT if I revved it up it registered as normal-or at least it moved like it was normal. Idle is perfectly fine i.e. smooth/right around 750-800 rpm

Thought?

Is the tach electronic or mechanical?

Thanks

Jukelemon · 05-15-08, 11:09 AM

OK just searched and found that the tach is electronic.

So, why 0 at idle all of a sudden???

2ndGenToyotaFan · 05-15-08, 07:49 PM

That's bizarre... Does it operate normally, but 750-800 under what it should be all the time? Or when you hit the gas it jumps up to normal?

Either way..... weird. It gets its signal from the coil...... My guess is something's up in the tach its self, cause the coil's sending a signal if your truck is running.....

Jukelemon · 05-15-08, 08:44 PM

Quote:

Originally Posted by 2ndGenToyotaFan

That's bizarre... Does it operate normally, but 750-800 under what it should be all the time? Or when you hit the gas it jumps up to normal?

Either way..... weird. It gets its signal from the coil...... My guess is something's up in the tach its self, cause the coil's sending a signal if your truck is running.....

Yeah, weird. It is not 800 under-I feel I know the sound of the engine at the shift points and when I look it is where it should be i.e. right before 4k rpm's.

I would have to agree it is the tachometer. The connection are solid at the igniter and the tach works when I hit the gas-regardless if I am in gear or not.

Oh well. I can live with it.

Jukelemon · 05-21-08, 10:16 AM

Update..

After a day or so, tach went back to normal.

Really odd.

Operates perfectly now.

WristPin · 05-21-08, 10:26 AM

yeah. its odd.

i just took apart my dash. the tach came out too.
it is quite a marvel.
one strand wires, opposing coils...

aircrew · 05-21-08, 08:07 PM

My Hilux did that the other day...

Went back to normal as well. I have a 3L diesel...

WristPin · 05-21-08, 09:15 PM

mine did this today too, turned out one of my gerbils in the tires was out of water, so i fed him and gave him fresh water. now were back up to full operating temperature pulling two gerbil power

2ndGenToyotaFan · 05-22-08, 08:19 AM

Quote:

Originally Posted by WristPin

mine did this today too, turned out one of my gerbils in the tires was out of water, so i fed him and gave him fresh water. now were back up to full operating temperature pulling two gerbil power

Is that for extra power, or just to balance the tires......

Hehehe

missouriman · 05-22-08, 09:01 AM

or do you just hide your gerbils there and tell everyone you drove through some mud...

Jukelemon · 05-22-08, 06:54 PM

or are you friends with Richard Gere LOL!!!!!!

05-15-08, 11:06 AM	#1
Jukelemon IH8MUD Lifer Join Date: Dec 2003 Location: Georgetown, KY Posts: 1,966	Strange Tachometer Issue Hi all. On the way home today, I noticed that at IDLE my tach showed 0 rpms BUT if I revved it up it registered as normal-or at least it moved like it was normal. Idle is perfectly fine i.e. smooth/right around 750-800 rpm Thought? Is the tach electronic or mechanical? Thanks __________________ "May you be in heaven a half an hour before the devil knows you're dead" 1992 4x4 PU

05-15-08, 11:09 AM	#2
Jukelemon IH8MUD Lifer Join Date: Dec 2003 Location: Georgetown, KY Posts: 1,966	OK just searched and found that the tach is electronic. So, why 0 at idle all of a sudden??? __________________ "May you be in heaven a half an hour before the devil knows you're dead" 1992 4x4 PU

05-15-08, 07:49 PM	#3
2ndGenToyotaFan No longer pre-approved... Join Date: Jan 2006 Location: Yreka, CA TLCA# 13872 Sign Up!!! You know you want to! Posts: 3,526	That's bizarre... Does it operate normally, but 750-800 under what it should be all the time? Or when you hit the gas it jumps up to normal? Either way..... weird. It gets its signal from the coil...... My guess is something's up in the tach its self, cause the coil's sending a signal if your truck is running..... __________________ Jerod The 79-95 Truck/4Runner FAQ 89 4Runner "The James Caird" 01 4Runner, for my Jefferson State Cruisers

05-21-08, 10:16 AM	#5
Jukelemon IH8MUD Lifer Join Date: Dec 2003 Location: Georgetown, KY Posts: 1,966	Update.. After a day or so, tach went back to normal. Really odd. Operates perfectly now. __________________ "May you be in heaven a half an hour before the devil knows you're dead" 1992 4x4 PU

05-21-08, 08:07 PM	#7
aircrew PVT. RICE CF Join Date: Jan 2007 Location: Calgary, Alberta Posts: 228	My Hilux did that the other day... Went back to normal as well. I have a 3L diesel... __________________ 1978 Toyota BJ40 B Diesel 1989 Toyota Hilux Crew Cab 3L 1989 Mazda B2200 SR20DET .zoom zoom. 1969 Mercury Marauder X-100 429 4bbl 1928 Ford Model T Huxter 4 cyl, really stock 1961 Austin Mini 1100 1974 Yamaha Enduro All the colors of the garage BR Crazy for dems oil burners!!!!1 Resto of the Klunk Munkey http://forum.ih8mud.com/40-55-series-tech/168364-1978-bj40-restoration-klunk-munkey.html

05-22-08, 09:01 AM	#10
missouriman IH8MUD Junior Join Date: Jan 2007 Posts: 189	or do you just hide your gerbils there and tell everyone you drove through some mud...

05-22-08, 06:54 PM	#11
Jukelemon IH8MUD Lifer Join Date: Dec 2003 Location: Georgetown, KY Posts: 1,966	or are you friends with Richard Gere LOL!!!!!! __________________ "May you be in heaven a half an hour before the devil knows you're dead" 1992 4x4 PU

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