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'86 V6 Tach reading high by bcampbell
Started on: 03-21-2012 08:05 PM
Replies: 3 (130 views)
Last post by: Lou6t4gto on 03-28-2012 12:52 PM
bcampbell
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03-21-2012 08:05 PM Click Here to See the Profile for bcampbellClick Here to Email bcampbellSend a Private Message to bcampbellEdit/Delete MessageReply w/QuoteDirect Link to This Post

Hey so I've got a 3.5L LX9 swapped into my Fiero and my tach is reading high, just wondering what could cause this. Before the engine swap, the tach was reading high with the stock 2.8 as well (by about the same amount). The new engine has DIS so there is no tach filter. With my laptop hooked up and datalogging I can see the actual engine RPM.

So do I just need to replace my tach or is there something else going on?
Alternator seems to be charging fine, at around 14V.

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Lou6t4gto
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03-23-2012 06:39 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post

TOO HIGH..... By How Much ? a couple hundred, or double ?

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bcampbell
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03-28-2012 11:41 AM Click Here to See the Profile for bcampbellClick Here to Email bcampbellSend a Private Message to bcampbellEdit/Delete MessageReply w/QuoteDirect Link to This Post

Too high as in more of a percentage. When idling around 800rpm the tach reads over 1000. When cruising at around 2500 IIRC it's around 3500.

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Lou6t4gto
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03-28-2012 12:52 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post

Off by 1000 at 2500 ? You probably need a tach. But the 3500 changeover May have something to do with it. I don't believe you can adjust the tach.

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