lostsonta

So here is my problem:

As I accelerate my RPM needle bounces up a few thousand RPMs and then back down to correct RPMs as I first shift into each gear. Once I'm in fifth and at cruising speed, the needle will sometimes bounce up 2 to 3 hundred rpms and back down to correct RPMs. When the RPM needle starts to jump, the engine doesn't increase RPMs but stays at the level where the needle began to bounce.

If the car is in neutral and I give it gas the RPM will sometimes bounce up a few hundred RPMs once i get into the 3000 RPM range.

If I'm stopped, either in neutral or in first my car idles perfectly at 750 RPMs.

Anyone have any ideas what I should be looking for?

Clutch Slippage? - I have never had a car that the clutch started to slip, but watching a few Youtube videos, my RPM bounces up and down while clutch slippage is more of constant increase.

IACV? - I don't think it's an idle problem as my car idles perfectly when stopped

Bad cluster? - I pulled the cluster and checked the connections, which all seemed to properly connected.

Help?

kronikSLOW

check your tach with a rpm gage to see if its correct.you tach could just be wiggin out. you said the engine doesent seem to increase rpm..right.

310Integra

check your igniter. it could be that its giving out and you might not want it to go out where your out of home. im almost certain its related to the igniter,

lostsonta

It's not misfiring, bogging down, and or throwing any CELs when the needle bounces up. The car drives smooth when the problem happens.

thatblkguy

could also be the head gasket starting to give.

lostsonta

If the head gasket was leaking, then I would think that it would jump like it does in first while I give it gas in neutral.

Paladin12

i have the exact same problem in my 96 integra.

i replaced the ignitor 2 years ago. Problem came back last month. Replaced ignitor again but the problem continues. My head does leak oil do to accidental overheating do to leaking radiator(fixed now), but warped head

Is there methods to track the problem down or test if my head gasket, as was mentioned, is cracked or failing? Bad ground? Different electronic component responsible for tach?

Thankyou for anyhelp or suggestions.

velisma

blue wire leading to your dizzy or your VSS could be messing up as well. I had/have the same problem where the RPM needle would either jump and do some erratic things when accelerating hard or wouldn't work at all. Got a friend to check voltage and no juice coming thru the blue wire.

p.s. I don't see what a bad headgasket has to do w/ RPM's jumping. This is a voltage problem. Not a compression issue.

94 ls-r

Its either the ignitor which is my prob or the gauge itself. If ya can swap dizzy with someone and see wat it do

Mattb16teg

Ignitor inside the dizzy. Could also be cap or rotor.
I had this problem a few months back and replaced everything(lucky for me it was time for a tune up) only for it to be an issue in the harness with a broken wire.

speedooo

headgasket? how the hell would a physical problem like a leaky headgasket have any influence over a signal given by the distributor? please enlighten me.

OP...the signal comes from the distributor, blue wire to be specific. it could be a frayed wire or a faulty piece inside the distributor...see if you can try somebody else's distributor.

Mattb16teg

LoL @ 2010s!

OP if you do try someone else's dizzy, please for the love of god make sure timing is set before starting the car! Or at least mark something for reference!

el crapitan

tach signal is pulled from the ckp. crank sensor. dunno wth people are talking about with headgaskets, ignitors, rotors and whatnot

94 ls-r

The ckp will actually make your car run like poo too. Got a cheap vato zone dizzy to get me by and when I hit bout 7k it pegs to over ten and bogs my car. Your best bet is to swap another dizzy on and see wat it do.

el crapitan

^^usually, yes. if there is a problem with the actual ckp, it will run like *** while the tach needle will be erratic. that's usually the case. unless there is an issue with the wiring between the ckp and tach. in which case the ckp will function normally, while the tach will act erratically.
i agree though, i'd test with a known good distributor if possible

94 ls-r

If you swap the dizzy and still the same try the cluster. Do the easy first before ya start tearing into the harness

knettles5

having similar issues

Solster

this fixed my tach

http://forums.g2ic.com/tegtips/engine/10.html

freshCROOKS

It could be your speed sensor. I once blew my motor, bought an automatic engine, switched the torque convertor and put everything back together. Fired it up and it was fine....until I took it out for a drive. The rpm needle was acting up. So I disconnected it. Cleaned it. And put it back on. Ran fine after.