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Tach start jumping when i reach 65 to 75 milles per hr

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1969 with 351 Windsor stock engine. Once it reaches 1,500 rpms why do the tach & engine jump up and down?

If this is a points type ignition, check for excess play side to side in the distributor shaft, and also for timing chain slack--easily tested by removing dist. cap and rotating engine back and forth with wrench on crank pulley bolt. If rotor doesn't move immediately as crank turns you have loose timing chain.

Oct 02, 2015 | Ford Mustang Cars & Trucks

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Chevy S10 1998 2.2 L engine . In 105 degree temperature I was driving approx. 60 miles per hr when I suddenly started loosing power. It slowed to about 40 miles per hr, started smoking & smelled l

It appears the cap screws off? It doesn't look like a regular radiator cap. I looked at acdelco parts book.
If the cap is stubborn, cold engine, sometimes I use a pair of pliers with wide jaws, grip the cap and screw it off. I haven't seen your type cap, before. If this was my vehicle, I would certainly want to look in the radiator. I'd get that cap off, one way or the other. Of course, nobody wants to damage anything.

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Mar 11, 2017 | Cars & Trucks

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I have a 99 stratus 2.4l that the tach goes to 1500 then sticks until i reach a higher speed and jumps to 4000rpms. can someone let me know why this is. it does work randomly..

You need to have the tach replaced or take it out and have an auto repair shop or the dealer send it out for repairs, that is if it's repairable.

Feb 11, 2012 | 1999 Dodge Stratus

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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.

Apr 25, 2011 | Plymouth Acclaim Cars & Trucks

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My 2007 Dodge Caliber has lost power and will not accelerate. beyond 5-10 miles per hr. or past 2000 rpms on tach. The shock thunderbolt lightson dash.- electrronic throttle control system problem. how do...

When some error codes are displayed the computer puts the car into limp mode - this restricts the speed of the car so you can get home or to a repair shop - you should not drive it now until the problem is solved to avoid any further damage.
You may just have a faulty camshaft position sensor on one bank or maybe the timing belt may have jumped a cog and require replacement.
Code readers are very reliable - the code readers only displays the fault information that is sent from the computer - this tells the mechanic the exact fault or gives them a good starting point to diagnose the problem.
Sometimes resetting the fault codes in the computer with the code reader will fix the problem (it may have just been an incorrect fault indication) - if not - it will default again which confirms the fault and you will need to fix the problem.

Apr 25, 2017 | Dodge Caliber Cars & Trucks

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I have a 99 chevy blazer 4.3 v6 4x4 and as I was driving today the vehicle just started to not want to drive it would let me drive at 10 miles per hr and the oil pressure light went way down any ideas as...

well my friend it sounds like a clear case of your timing jumping out of mark. (jumped a tooth). Youll need a complete timing service and I'm sure you'll be good to go again. If Im wrong, I'll eat my shoe.

May 25, 2010 | 1999 Chevrolet Blazer

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.

May 24, 2009 | 2002 Jeep Grand Cherokee

1 Answer

Tach inoperative

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.

Dec 03, 2008 | 1991 Chevrolet Corvette

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