Erratic Tach...

[Bob Harriman]

Bouncing tach was an ignition problem for me. Petronics took care of that

[buzdrum]

Mail it to me.

Originally Posted by Carl83911

Thanks for the offer. I live in Sacramento.

[Carl83911]

Follow up on my Erratic Tach issue:

The culprit was my Permatune Unit. The Tach circuit shorted out which caused my tach to be erratic.

The Permatune finally fully fried last Sunday. Had the car towed to my Mech and after thorough inspection, it was determined that the Permatune was defective. I was still in the warranty period so no cost out of pocket other than tipping the tow guy 20 bucks for getting my car out of a parking garage with ceiling heights of only 6'10". I normally require a flat bed but he was able to use casters for the rear wheel and a wheel lift for the front.

So, it's not always an alternator about to go bad when your tack decides to dance uncontrollably.

thanks for your feedbacks,
Carl

[wwest]

Originally Posted by Carl83911

Follow up on my Erratic Tach issue:

The culprit was my Permatune Unit. The Tach circuit shorted out which caused my tach to be erratic.

The Permatune finally fully fried last Sunday. Had the car towed to my Mech and after thorough inspection, it was determined that the Permatune was defective. I was still in the warranty period so no cost out of pocket other than tipping the tow guy 20 bucks for getting my car out of a parking garage with ceiling heights of only 6'10". I normally require a flat bed but he was able to use casters for the rear wheel and a wheel lift for the front.

So, it's not always an alternator about to go bad when your tack decides to dance uncontrollably.

thanks for your feedbacks,
Carl

"....not always...alternator..."

Not conclusive....was the Permatune failure due to intermittent stator shorting in the alternator...???

My alternator failure not only resulted in a jumping/erratic tach but also a CDI failure.

Wait for it.....

[Carl83911]

Originally Posted by wwest

"....not always...alternator..."

Not conclusive....was the Permatune failure due to intermittent stator shorting in the alternator...???

My alternator failure not only resulted in a jumping/erratic tach but also a CDI failure.

Wait for it.....

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The alternator was tested and nothing wrong. I generates a consistent voltage when running.

[timmy2]

Glad you found it, any explanation from permatune as to why it failed?

[Carl83911]

Originally Posted by timmy2

Glad you found it, any explanation from permatune as to why it failed?
A

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Sorry no, basically just a defective unit. only a few months old.

[wwest]

Originally Posted by Carl83911

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The alternator was tested and nothing wrong. I generates a consistent voltage when running.

Yes, mine did also, except for hitting a bump in the road and then a stator winding would intermittently short out due to overheated stator wire insulation. With one stator winding non-functional the VR must increase the output of the other 2 in order to get a correct average at the battery. But back there in the engine compartment you have seriously over-voltage (>15 volts) SPIKES.