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Tach dosnt work untill 3/4 throttle then it will will only read 300 rpms it is a power shift is there a calibration to be done to dash

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  • Cars & Trucks Master
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It is a relay issue
what year,make model?

Posted on Apr 01, 2015

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I have a 1990 chevy camaro and my rpms r high win the car Is not started and win I start the car thay go even higher

Hi, You could have a vacuum leak. Check all hoses that are connected on or near the intake manifold and throttle body. Good luck.

Aug 14, 2011 | Chevrolet Camaro Cars & Trucks

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If you don't want to take it to a trans shop etc.then
your not going to get it repaired

If you keep driving it,then the trans will have to come out
& be rebuilt.

You may have a bad Trans Solenoid Pressure Control Pack

If you have been driving it with it slipping,your pretty much done

Jul 11, 2011 | Ford Mustang Cars & Trucks

1 Answer

The tach is sticking and sometimes it starts at 3 or 4 and goes up at after you start up. So you may be running 5 or 6 at 20mph

put car on a scanner to see if tach corresponds with actual rpms--if thats the case then transmission is stayin in gear or throttle body/fuel inject needs servicing

Mar 03, 2011 | GMC Sierra 2500HD Cars & Trucks

1 Answer

Not shifting into drive

not shifting into you going 60mph? downhill with the wind behind you?

You put it in drive and its "not shifting into drive" what happens then? If it doesn't shift into drive, you're not moving. If you're moving, You can feel it shift. The rpms change. keep track.

Jun 03, 2010 | 1995 BMW 3 Series

1 Answer

Tach jumps all over the place driving and idle. works correct sometimes. how to repair?

crank sensor is tied in with the tach. you have problem with crank sensor or electrical problem. the tach reads rpms, if the sensor is bad it throws the rpms way off. this is why you get the jumping in gauge.

May 28, 2010 | 1993 Nissan Pathfinder

1 Answer

Rpms fluctuate 300 to 400 rpms when driving

hav u done your needed maintenance like checking oil level-itz done with engine going in park also shift cable needs ajusting or solenoids on the electronic models if alot of miles then a rebilt is posible am tired and its late-try testing the tps sensor 1st has to with shifting***

Aug 07, 2009 | 2000 Dodge Dakota Quad Cab

1 Answer

1994 f-350 7.3 turbo diesel.tach reading 0 rpm's at idle speed.

yea the 93 to 95 trucks never had a tach that works very long
and first the Tach does not make the od light blink or ck engine lgt
the crank trigger does this little thing is located right in middle front of engine between the vac pump and pwr steering pmp looks like a brass bolt with wires comming out of the back of it costs about 30 bucks (don't forget the locktite blue)
now that should fix the od lights and the ck engine but it may not fix the tach thats done in the tach driver module on back of tach in dash
you can replace this but my vote it's too expensive I did mine just fine with a after market one(50 bucks), bolted it right in front of old one, it hooks up super easy gets it's signal off the alternator stator

im sort of suprized it starts ok with a bad crank trig (eec needs to see +50 rpm to start fuel flow to injectors )

any good shop with a eec scanner can see this in just seconds

Apr 12, 2009 | 1993 Ford F350

2 Answers

Tach revs up 300 to 800 rpm on its hiway speed.

My 1998 5.2 Dakota did the same thing... I removed the Idle Air Control valve and cleaned it with carb cleaner and my problem has been fixed (FOR FREE). At the same time I removed the Throttle Position Sensor and inspected it. I have read that running a very good fuel system cleaner in a tank of premium gas will help clean the carbon buildup on the sensors and throttle body. These two sensors are located on the Throttle Body and remove by unscrewing two Torx screws... the entire process took me less than 5 minutes. I know it is called an IDLE Air Control Valve (or solenoid) but my truck also did it while going down the road at certain speeds.

How to Clean the IAC Solenoid:
This is recommended at every Tune-Up to prevent excess carbon buildup on the IAC plunger. In some cases, you'll notice a slightly erratic idle quality. This is the first step in taking care of that problem. IAC = Intake Air Control (Solenoid).
  • Remove the Air Hat from the Throttle Body
  • Disconnect the sensor harness from the IAC Solenoid (Rear of Throttle Body)
  • Remove the two Torx-25 Screws
  • Remove the IAC Solenoid (Be careful not to lose the rubber O-Ring)
  • Spray some Carb/TB Cleaner in the IAC port on the Throttle Body and let it sit
  • Spray some Carb/TB Cleaner on the tip of the IAC Solenoid and wipe clean (Do NOT forcefully twist or push the plunger - You will damage the Solenoid. Wipe very gently.)
  • Spray a little bit more Carb/TB Cleaner in the IAC port on the Throttle Body and wipe clean with a thin/lint-free rag
  • Reinstall the IAC Solenoid (Make sure you don't lose the rubber gasket on the solenoid)
  • Reinstall the sensor connector and airhat
  • Start the engine and let idle for about 1 minute.

Dec 29, 2008 | 1998 Dodge Dakota

1 Answer

Tach on my 1995 eldorado is not correct

I have a complete dash for a 95 which should fix it. They are kind of a pain to replace, and the one I have has 91,000 on the odometer.

Dan Lemke

Dec 14, 2008 | 1995 Cadillac Eldorado

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