speedometer question - Honda Prelude Forum

ntrddragn · 05-27-2002, 12:53 AM

my rpm sometime jumps when i am stepping hard on the gas. it goes from 3K to 4K then drop back down to 3K...from 4K to 5500...etc...i did a tune up,clean fuel injector, reseal the valve cover, radiator, thermastat..etc..in spend about 1500 to 2000

but this rpm happen after i did the above stuff...i was told it was the coil on the rpm.."since its related to electricial, you might want to change the whole speedometer".. does any1 know about this? thnx for the help

soopaswoze! · 05-27-2002, 01:01 AM

Quote:

Originally posted by ntrddragn
my rpm sometime jumps when i am stepping hard on the gas. it goes from 3K to 4K then drop back down to 3K...from 4K to 5500...etc...i did a tune up,clean fuel injector, reseal the valve cover, radiator, thermastat..etc..in spend about 1500 to 2000 but this rpm happen after i did the above stuff...i was told it was the coil on the rpm.."since its related to electricial, you might want to change the whole speedometer".. does any1 know about this? thnx for the help

im probably wrong, but i had a problem sorta like this on my 90 prelude, was the speedo cable that goes to the tranny.. was just a loose connection, would touch sometimes other times wouldnt..
but all I remember is it messed with my mph, I have no memory of it messing with the RPM.. just something else to check you know? sorry I couldnt be more help

marcucci · 05-27-2002, 06:21 AM

There's no cable on the 4th gen Prelude and up, it's purely electrical.

Your problem is more than likely in or related to the speed sensor. The only way to check it is to try another unit. If that doesn't fix the problem, you will need to start hunting for electrical problems with the wiring or perhaps the speedo itself.

Ludism · 05-27-2002, 07:31 AM

I have the same problem except its my mph that is affected. When i'm driving around town, my needle jumps up and down rapidly and sticks to speed too fast or too slow than what i'm actually doin. I remember driving about 80mph and having many cars pass me quickly, it turns out that i was actually doing 70mph, so i would like to know the cause also...

knightluder · 05-27-2002, 10:09 PM

I had a bad speed sensor that affected my mph, but I don't know if that affects the tachomoter as well. If so, you are looking at about 150 bucks.

ntrddragn · 05-29-2002, 07:17 PM

Quote:

Originally posted by marcucci
There's no cable on the 4th gen Prelude and up, it's purely electrical.

Your problem is more than likely in or related to the speed sensor. The only way to check it is to try another unit. If that doesn't fix the problem, you will need to start hunting for electrical problems with the wiring or perhaps the speedo itself.

i wish i have another unit to try...is there a place that i can get 1 to test? cuz i dont want to spend $$ if i dont have to..the shop want 350 to replace it for me..with a used 1...but my mileage will be different..

overdose · 05-29-2002, 07:21 PM

mine did that with the speedo needle, turned out to be the cluster... i have a few extra 94-96 SI clusters around, they kept sendin me the wrong one when i wanted a VTEC one and i got to keep the ones they mis-shipped

ntrddragn · 05-29-2002, 07:26 PM

Quote:

Originally posted by overdose
mine did that with the speedo needle, turned out to be the cluster... i have a few extra 94-96 SI clusters around, they kept sendin me the wrong one when i wanted a VTEC one and i got to keep the ones they mis-shipped

would it fit a 92 Si? how hard it is to take apart the dash and cluster? new?how much u want for it? not to much ,please

overdose · 05-29-2002, 07:31 PM

there's some extra stuff, minor i believe, that needs to be done to the 92's to get the electros working

ntrddragn · 05-29-2002, 08:11 PM

Quote:

Originally posted by overdose
there's some extra stuff, minor i believe, that needs to be done to the 92's to get the electros working

like what knid of stuff?..and my other above question to? or u can pm me..thnx

aneurysm · 05-29-2002, 10:50 PM

possibly the tach sending unit, or more possibly something wrong with the distributor.

brad

Jape · 05-29-2002, 11:33 PM

bad clutch? lol i have no idea

ntrddragn · 05-29-2002, 11:44 PM

Quote:

Originally posted by aneurysm
possibly the tach sending unit, or more possibly something wrong with the distributor.

brad

how or where would i test/find the tach sending unit on my car?

aneurysm · 05-30-2002, 08:24 AM

you would need the electrical troubleshooting manual.
they are about $70 from Honda.

More than likely its just the distributor. I had an Accord that did the same thing and that was the problem.

brad