1991 Accord--tach goes to "0" when I turn lights or heat on

Page 1 of 2  
I have a 1991 Accord with a 5spd F20A SOHC motor that is having problems today. I woke up to take kids to school and car was dead. Car was not started for 5 days and my wife said that yesterday she heard the cooling fan
running in the garage. Garage is heated to 55 degrees. So, I jumped the car and idle was fluctuating and car was running very "choppy". When I hit the gas, the engine sputtered and back fired through the throttle body. I left the car running for the 10-15 minutes that it took me to drop off kids in truck. When I came back, car was idling fine(@850rpms) and running smooth. I thought it was okay now. I turned it off after another 10 mins and went back inside. Now, I started it and went to work and everything seemed okay. When I went to go to lunch, battery was almost dead (laboring to turn over) so I let it run for a few minutes, then as I was about to pull off, I turned on the lights and the tach dropped to "0" like the car stalled but it was still running. When I hit the gas it was sputtering and back firing. I turned the lights off and the tach went back to normal. I turned the heat on and the tach went back to "0". Hopefully I will be able to limp the car the 6 miles to get home without getting pulled over for no head lights.
Any input is greatly appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
jim_l wrote:

Disconnect the battery for 20 seconds so everything can reboot. You have a few ghosts in the machine. Then do an 'idle learn procedure, if things don't return to perfect:
http://www.hondasuv.com/members/showthread.php?tP61&highlight=idle+learn+procedure
'Curly'
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

The thermosensor that controls the cooling fan is faulty. The fan won't be on at 55 degrees!! Your battery was wrecked by that stupid fan. And when the battery can't maintain proper voltage, the ECU is confused. So reset it (pull a fuse if your car has one, or simply disconnect the battery) then start the engine and let it idle for 10 minutes. Do not press the gas pedal during this process. But fix the sensor and replace the battery as soon as you can.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Today I went and warranteed the battery for a brand new one and put it in. The car started right away with no problem. Idle still fluctuating (1200- 2000) and gradually made its way down to 850 rpms when it was at operating temperature. After the initial start I took off the battery terminals and let the car warm up on just the alternator to check if the alternator was bad. When the car was warm and at a steady idle I tried turning it off, reconnecting the battery and starting it again. Started fine and idled fine, I disconnected battery again and tried turning on the lights and the car shut off. Now, I reconnected the battery and started it again, this time when I took off the terminals the car died instantly and the lights weren't even on. The alternator is only a year old and I bought it new. Could the alternator be shot already? And would the alernator cause the tach to drop to "0" while the car is still running? I also put in the VSS that I had bought a few weeks ago when the speedo was jumping and tach still dies when I turn the lights on. Also, fyi, the check engine light didn't come on.
--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/honda-cars/200802/1
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
jim_l via CarKB.com wrote:

You need to take the car to a facility that can properly determine if the alternator is working.
And find a mechanic that knows what he is doing.
Jeff
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 2/26/08 2:56 PM, in article 805344b9a8380@uwe, "jim_l via CarKB.com"

If this is an actual Honda alternator, it is pretty unusual to see a failure this soon. If this is a Chinese rebuilt from AutoZone or the like, its a surprise that it worked this long.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

oh no! you're not supposed to let the engine running on the alternator to test it!!!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
jim_l via CarKB.com wrote:

-------------------------------
Never do that to ANY vehicle. It's right up there with "I unplugged my hard drive and then plugged it back in with the computer running".
You've probably screwed up the alternator and possibly the ELD.
:-(
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
And would the alernator cause the tach to drop to "0" while

Jim,
The tach is electric. No juice, no tach. Have the charging system checked.
G-Man
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Do you work for a dealership?
How long have you been reading at this newsgroup?
Hondas need not be abandoned until the engine has given up the ghost.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 26 Feb 2008 07:32:40 -0700, Elle wrote:

No.

A couple of years.

Which is exactly what I'm talking about above.
--
"Ubuntu" -- an African word, meaning "Slackware is too hard for me".


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
E

Some electrical part likely has given up the ghost.
Until the piston rings fail or similar, the engine is fine.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

You are an amateur who has barely studied the archives of this newsgroup, barely worked on older Hondas.
No way are the symptoms evidence of a failed engine.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Wed, 27 Feb 2008 09:17:58 -0700, Elle wrote:

More conjecture. You can't possibly know those things to be true.

I guess you didn't read my other post about how it doesn't matter what exactly has failed, if you're stranded on the side of the road. You're still stranded on the side of the road, and the *FACTS* are that this is much more likely to happen with a car such as the one being discussed here.
Do you have anything else that you'd like explained to you?
--
"Ubuntu" -- an African word, meaning "Slackware is too hard for me".


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 2/27/2008 8:33 PM Dan C spake these words of knowledge:

Folks, I hate to have to say it, but this miniature-brained specimen makes jim beam look wise, not to mention polite.
I recommend you quit feeding this particular troll.
RFT!!! Dave Kelsen
--
It is flattering some men to endure them.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Elle wrote:

...and even then, there are alternatives than high payments and plastic cars...
JT
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Elle

Oops. I forgot that low mileage used Honda engines (shipped from Japan) are available for under $900 in the U.S.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 26 Feb 2008 16:50:08 +0000, Grumpy AuContraire wrote:

As can any other car, if you're willing to do it.

I've got clues enough for the both of us, Gramps. What the fuck is a sheeple?
--
"Ubuntu" -- an African word, meaning "Slackware is too hard for me".


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 26 Feb 2008 16:48:46 +0000, Grumpy AuContraire wrote:

It's "irrational" to want to drive a car less than 20 years old? Is that what you really think?

I don't care about MPG, or payments, or insurance. I can afford all of them. I own 5 vehicles (one Honda which is an 07 Accord), and all are less than 3 years old.

Are you sure? Wanna bet?
--
"Ubuntu" -- an African word, meaning "Slackware is too hard for me".


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Dan C wrote:

cars to hang out in a newsgroup of people who do want to fix them.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

    Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.