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I have a 1978 corvette and the speedometer is not accurate and jumps around lot. any idea what is wrong with it.

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SOURCE: SPEEDOMETER NEEDLE JUMPS UP AND DOWN BELOW

If someone before you bypassed the cruise control transducer and the cable goes directly from the transmission to the guage then the cable will be bent too much to work correctly. The car should have two cables. Once from the transmission to the transducer and then another from the transducer to the guage.

Posted on Mar 30, 2010

  • 510 Answers

SOURCE: 99 cavalier - the fuel gauge doesnt read accurately and it jumps

Possibly a bad ground wire at the sender on the tank,

Check for that first before tearing into the dash to replace the guage.

Posted on Mar 31, 2010

  • 1 Answer

SOURCE: 1994 toyota camry speedometer not working

speedometer works intermitently

Posted on Oct 07, 2010

  • 140 Answers

SOURCE: My 1991 Toyota 4WD 5

check speedo cable for tightness at both ends,1 on trans 1 back of dash.if tight replace the cable,they can bind or strstch in liner causing speedo bounce.

Posted on Feb 15, 2011

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Where do I find vin number on a 1978 corvette?


For all 1978 Corvettes, the location of the Vehicle Identification Number (VIN) is stamped on a plate attached to the left front body hinge pillar.
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Mar 02, 2015 | 1978 Chevrolet Corvette

1 Answer

Have a 2002 Cadi deville, replaced the speedometer sensor because the needle was jumping. Now the speedometer won't work at all.


sounds like your in the area could be a bad sensor or a bad wire that your moving around when changing the sensor

Jul 20, 2012 | Cars & Trucks

1 Answer

My 1991 Toyota 4WD 5 Speed with 22Re Engine speedometer constantly bounces around a lot and I cant accurately read the speed of the truck


check speedo cable for tightness at both ends,1 on trans 1 back of dash.if tight replace the cable,they can bind or strstch in liner causing speedo bounce.

Feb 15, 2011 | Toyota Pickup Cars & Trucks

1 Answer

1978 corvette when i shut the car off my head lights pop up. i can start the car and they go down and stay down. got any ideas


Those are vacuum actuated headlights and the vacuum leaks down when the engine is off. Probably have a leak in the headlight actuators, will need to replace or rebuild one or both of them, not a big problem for them to pop up some people just do not like for them to pop up while parked.

Jul 24, 2010 | 1980 Chevrolet Corvette

1 Answer

99 cavalier - the fuel gauge doesnt read accurately and it jumps


Possibly a bad ground wire at the sender on the tank,

Check for that first before tearing into the dash to replace the guage.

Mar 31, 2010 | 1999 Chevrolet Cavalier

2 Answers

SPEEDOMETER NEEDLE JUMPS UP AND DOWN BELOW 25-31 MPH 1978 W/CRUISE CORVETTE C3


REmove speedo cable & inspect inner cable for frayed wire. If not frayed lube cable with graphite grease preferably or oil. replace cable. this should solve problem. If not replace cable.

Sep 15, 2009 | 1980 Chevrolet Corvette

1 Answer

90 corvette with 22,000 miles running very rough and back firing


Well it sounds like you've started to do your "due diligence", but there are several things left out. Your problem could be many things. Something as minor as a vacuum hose left off, loose, or in the wrong place. And just because you changed the plugs and wires, don't mean you fixed your problem. Open your hood at night and see if you have any sparks "dancing" around. Another way to check this is to open your hood and spray a soapy water solution on your plug wires and look for sparks jumping around. If so replace your wires. You didn't mention what type of wires and plugs you used. I would reccommend NKG platnum plugs and a Bosch wire. I know this from experience,(the hard way teacher). It could even be the gas you are burning. I've owned a lot of Vettes, and I am the kind of guy who believes they should be driven. If not it's like having a beatiful wife and never taking her to bed.I know a lot of people who only drive them "once in awhile". Sitting in thier garage can cause many fuel problems, condensation, sludge in the carb, or filters etc. This can all lead to the problem you are describing.
Low speed miss- usually plugs
High speed miss- usually wires or valves
intermitten miss, fuel or electrical.
I hope I gave you some places to look to find your problem.


Jul 07, 2009 | 1990 Chevrolet Corvette

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