C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

No Tach. reading on cluster

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Old Sep 29, 2002 | 07:00 PM
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Default No Tach. reading on cluster

Started my fresh motor today for the first the time. First, didn't want to idle at first so I bumped the idle up a little, but I noticed that I do not have a tach reading. I think my idle problem maybe caused by the 2034 compcam and the 1:6 rockers on a stock eprom, I think??? As I let the car run only for a short while (just running shorties) I noticed I have no tach reading. The cluster is reading fine during it's self diagnostic check during start-up. I checked the tach connection on the distributor and it seemed fine. Where else can I check...also will the 2034 run on the stock chip?

Thanks for your help :cheers:
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Old Sep 29, 2002 | 08:24 PM
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Is this the 88? You might of forgotten to plug the tach filter/lead back into the ECM, or possibly you pinched the lead?
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Old Sep 29, 2002 | 11:04 PM
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Default Re: (scorp508)

Hey scorp, thanks for the reply, is this the same lead the connects to the distributor in the tach location?
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Old Sep 29, 2002 | 11:09 PM
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Hey scorp, thanks for the reply, is this the same lead the connects to the distributor in the tach location?
Correct. It goes distributor ---> Tach Filter ----> ECM

The tach filter is mounted on a little aluminum tab on the upper/left bellhousing bolt.
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Old Sep 30, 2002 | 09:25 AM
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Default Re: (scorp508)

scorp,
as far as the tach filter, you must be referring to the capacitor that is mounted to the bell housing. I may have gotten it pinched, because for some reason that wire gave me the most trouble trying to mount. What plug does the tach connect to the ECM?
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