I have a 93 ls. ive had the car for about 2 months and recently when i was driving it i got over 6000k rpm and the tach started jumping.. like it went to 7500k when i went past 6000k. but i dont think it dose it all the time, just onece in a while. can somebody tell me whay its doing this?? thanks

 

when was the last time you had a tune up?

 

well i got the car about two months ango. but i can see that the wires and plugs were replaced. and also before i bought it he replaced someting in the distributer, or the distributer itself because the rpm's were jumping all the time. so i dont know

 

If your rpm's are jumping, but it's just the gauge thats jumping and not the actual rpm's, then i'd look into your VSS (Vehicle Speed Sensor)

It may be loose. It should be on the top of the tranny.

 

well i dont know if it was my imagination but it felt like the car was like toping out kinda too... but idk. can you tell me like exactly were it is so i can check... thanks

 

hummm timming?...i had a timing problem onces...and it wouldn't let me bring my car past 5000 RPMs...

 

damn.. i just took it around the block and it was doing it a little..i cant tell if its toping out or what.. well when im just sitting there reving it, it dosnt do it at all.. only when i driving. i hope its not timeing..

 

I have the same problem. If I rev over 5500 rpm then the tach starts jumping randomly, it's not the actual engine erraticaly revving, but the tach jumps all over the place. But then it randomly goes back to normal after like 15 minutes or so.

 

I had a similar problem and it seemed to be that my positive battery terminal was was too close to the firewall and I was arcing ocassionally causing intermittent rpm jumping. The plastic red cover wasn't fully covered so I would arc.

Or maybe your ignitor is going bad. Do a search on igntors to possibly find your answer.

Good luck!

 

thanks

 

well i just looked at my pos battery term and it has some corrosion on it. ill clean it and see if that dose anything.

 

anything yet? I would like to figure out what causes this.

 

mad vtak powah!!!!!!1111oneoneoneone

seriously though, check your distributor/cap/rotor/plugs/plug wires first. ignitor could be bad, coil could be bad, but check the cap and rotor first

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hoonty &raquo;</TD></TR><TR><TD CLASS="quote">I have the same problem. If I rev over 5500 rpm then the tach starts jumping randomly, it's not the actual engine erraticaly revving, but the tach jumps all over the place. But then it randomly goes back to normal after like 15 minutes or so. </TD></TR></TABLE>

i'm tellin you, check your VSS.....i bet it's loose, you may be able to get away with just pushing it and tightening it up a bit. I was able to when this happened on my EG.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DAguyLS &raquo;</TD></TR><TR><TD CLASS="quote">

i'm tellin you, check your VSS.....i bet it's loose, you may be able to get away with just pushing it and tightening it up a bit. I was able to when this happened on my EG.</TD></TR></TABLE>Sorry bud but the vehicle speed sensor would make the speedometer jump not the tach. Most of the time when that happens it means you have a faulty ICM(ignitor). I would seriously look into that first.