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Jumpy tach problem by Harley95
Started on: 12-19-2014 08:25 AM
Replies: 7 (252 views)
Last post by: wolfwolf on 02-10-2015 04:18 PM
Harley95
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Report this Post12-19-2014 08:25 AM Click Here to See the Profile for Harley95Click Here to Email Harley95Send a Private Message to Harley95Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have an 88 Formula automatic that recently got a full set of new injectors, plug wires, rotor and cap, plugs. the tach was really jumpy before I got the new injectors, but today I noticed it jumping under load again but not as bad, does anyone have an idea what would cause this besides tach filter?
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theogre
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Report this Post12-19-2014 09:20 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
Iffy filter or tack itself are good bets.
Plug(s) to back of dash and/or dash circuit board can be problems too.

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Harley95
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Report this Post12-19-2014 09:28 AM Click Here to See the Profile for Harley95Click Here to Email Harley95Send a Private Message to Harley95Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by theogre:

Iffy filter or tack itself are good bets.
Plug(s) to back of dash and/or dash circuit board can be problems too.



I'm not sure, I'm going to jump the filter and see what I get. it wasn't jumpy when I first got it, and its just upper RPMs under load.

[This message has been edited by Harley95 (edited 12-19-2014).]

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Harley95
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Report this Post12-19-2014 08:21 PM Click Here to See the Profile for Harley95Click Here to Email Harley95Send a Private Message to Harley95Edit/Delete MessageReply w/QuoteDirect Link to This Post
just tried all the cylinders, they're all firing, so I don't get why its jumping under load. oh and I got a code that said my o2 sensor was bad, I'm getting a slight lack of power in the higher rpms, would the dead sensor cause that?

[This message has been edited by Harley95 (edited 12-19-2014).]

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Harley95
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Report this Post12-21-2014 06:59 AM Click Here to See the Profile for Harley95Click Here to Email Harley95Send a Private Message to Harley95Edit/Delete MessageReply w/QuoteDirect Link to This Post
just checked again cylinder 1 seems like its fouled a plug, I wonder why.....
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wolfwolf
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Report this Post02-10-2015 11:34 AM Click Here to See the Profile for wolfwolfClick Here to Email wolfwolfSend a Private Message to wolfwolfEdit/Delete MessageReply w/QuoteDirect Link to This Post
You ever find out the problem with jumpy tach under load?
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Report this Post02-10-2015 12:40 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
Possible pick up coil?
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wolfwolf
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Report this Post02-10-2015 04:18 PM Click Here to See the Profile for wolfwolfClick Here to Email wolfwolfSend a Private Message to wolfwolfEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just what I thought also. I had the same or similar problem. Changed out everything in the ignition system. Still had the problem and changed out the pickup coil and problem solved.
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