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12-02-2008, 11:54 AM
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#1
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Join Date: Aug 2008
Location: North Jersey
Posts: 543
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Tach reads 2500-3000 at idle.... Trans shifts too soon.
Ok, so my T/A has an issue with shifting that I thnik is due to a sensor or something. The tachometer reads 2500-3000 at idle... It's not actually idleing that high, it sounds to be idleing at 900 or so. I think whatever is causeing the tach to read so high is causing my transmission to shift too soon. I believe it is a 700R4. The only sensor I find that I think it could be is the "Vehicle Speed Sensor", but I'm not sure if that would effect the way the tach reads the RPMs. What else could it be?
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2010 Camaro 2SS, Inferno Orange, black stripes, Inferno Orange leather interior, RS package, 21" black rims, 6 speed manual trans, Inferno Orange engine cover.
1984 Trans Am Roadster, 305H.O, 31k original miles, all original.
1984 Camaro Z28 Roadster, 350 .40 over, cam, edelbrock 750, headers, flowmaster, more to come...
1986 IROC-Z, L98 swap, .30 over, forged internals, cam, headers, flowmaster, Go Fast juice.. - Sold 
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12-02-2008, 12:21 PM
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#2
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Stalker
Join Date: Aug 2004
Posts: 12,077
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afaik, an 84 should not have a VSS, The birds first got them in 85, camaros in 90.
an improper signal from the tach to the ecm MAY be causing the shifting issue. i'd try to get a cheap spare tach and run it off the coil/dizzy to see exactly what the motor is doing and go from there.
Last edited by V; 12-02-2008 at 12:21 PM.
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12-02-2008, 12:24 PM
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#3
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Join Date: Aug 2008
Location: North Jersey
Posts: 543
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Quote:
Originally Posted by SmokingSS
i'd try to get a cheap spare tach and run it off the coil/dizzy to see exactly what the motor is doing and go from there.
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Sounds good, I can try that. Thanks!
__________________
2010 Camaro 2SS, Inferno Orange, black stripes, Inferno Orange leather interior, RS package, 21" black rims, 6 speed manual trans, Inferno Orange engine cover.
1984 Trans Am Roadster, 305H.O, 31k original miles, all original.
1984 Camaro Z28 Roadster, 350 .40 over, cam, edelbrock 750, headers, flowmaster, more to come...
1986 IROC-Z, L98 swap, .30 over, forged internals, cam, headers, flowmaster, Go Fast juice.. - Sold
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12-02-2008, 06:37 PM
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#4
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NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
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The tach signal will not affect a 700r4 the only function the ecm has over the trans is the lock up. Your problems are most likely not related.
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JSSPEEDANDCUSTOM.COM
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12-02-2008, 07:57 PM
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#5
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Join Date: Aug 2008
Location: North Jersey
Posts: 543
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Hmmm.... interesting. Will have to investigate further.
__________________
2010 Camaro 2SS, Inferno Orange, black stripes, Inferno Orange leather interior, RS package, 21" black rims, 6 speed manual trans, Inferno Orange engine cover.
1984 Trans Am Roadster, 305H.O, 31k original miles, all original.
1984 Camaro Z28 Roadster, 350 .40 over, cam, edelbrock 750, headers, flowmaster, more to come...
1986 IROC-Z, L98 swap, .30 over, forged internals, cam, headers, flowmaster, Go Fast juice.. - Sold
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