Question about 1991 Chevrolet Corvette

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Tach inoperative when starting the car turning the key to start position the tach needle jumps up to 8000 the as the engine starts the needle drops to 0.

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  • Anonymous Mar 17, 2014

    tahoe tach jumps as engine seems to turn on and off

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  • 61,203 Answers

This is a classic symptom of a defective driver in the tach's circuit board, it can be repaired by a authorized GM electronics repair center.

Posted on Dec 03, 2008

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95 bmw 525i no dash lights no tach no tremp gauge and fuel gauge pegged way past full


Why was the battery missing to begin with? I would start by checking all fuses under dash and Central hub. Check for burned in-line fuses,if any, coming off of battery cables.

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Car does not start plus the tach needle jumped 2000 rpm with nothing runnig. I have already disconected start circuit white/white with red stripe and I had every thing else working fine for about a month,...


Here the good thing and this it will make it easy, The reason for that jumping tach meter tells you that there is spark and no fuel. Without fuel the spark KV voltage is 30kv. and it report to the tach. So you got spark and no fuel. If you had fuel the tach will show during cranking little tiny,tiny movement that you wont even see. So do this turn the key in the run position cycle it do you hear a humming noise from the rear you should that is the pump, they are sort of loud, If you dont you'll need a fuel pump. Even if you heard the fuel pump the fuel delivery may be low of pressure to start the engine. by the way try this have some one crank it and you hit the bottom of the tank may be you can shock it back.

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My 99 Regal won't start turning the key does not engage the starter at all. I do have electrical power for the seats and all other accessories. When I turn the key nothing. Interestingly enough when I put...


I just replaced my battery in my 99 regal. when i went out to start it went all crazy, ejecting cd out of player, all the gauges going on and off, tach, speed and fuel needles jumping all around. i pulled battery out and had it tested, it was bad, new battery fixed.

Jul 26, 2010 | 1999 Buick Regal

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Tach. drop's to zero while driving 70 ?


I have had the almost same problem twice. A 'thump', like the engine missed a fire and tach drops. Seems OK after restart. Electrical? Timing chain slip?
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1 Answer

Code p0336 starts hard tach wont work obd11 07 cobalt


P0336 means Crankshaft Position Sensor A Circuit Range/Performance. Try replacing the crank sensor next.

http://www.check-engine-light.com

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Tach needle buried at park


Purchase a new keyless remote FOB. The signal from the remote is weak and loses contact with the anti-theft module in the instrument cluster. We have 2 sets of keys and 1 worked while the other caused the instrument cluster needles to jump and jam the gear selector. The problem is not the car's battery, alternator, wiring or instrument cluster.

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Defective tachometer and speedometer


Do the following:1)key in the ON position:remove the 7.5 gauge fuse.Tach needle should read "0:". 2)put it back,go on the engine and unplug the green plug on the igniter -the big one,with 5 or 6 wires on it.The needle on tach reading should be zero.If not you have a short circuit on the black wire between that plug and the plug on the conbination meter.3) If the reading is zero with the plug disconnected,the black wire for the tach is short-circuited inside the igniter. I have one available.email daddykouki@gmail.com

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1 Answer

Car tach jumps and cover of air filter blew off.


It sounds like the engine "backfired" and blew the cover off. This and having the tach "jumping" means that the engine timing is erratic. This can be caused by the crankshaft position sensor or the ignition module. It could also be cross firing at the coil pack,if so equipped. Make sure all of the wiring to these components is good.

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