Topic: Too Long in Storage
in Forum: C3 Engines

Moderator
If you have a 350-400-700R4, and it just downshifts on its own, the most likely cause would be governor gear wear/damage. This would also keep the trans from shifting at all, except manually. If there is just wear on the gear, it may still upshift OK at times, and then not at other times. If the gear is damaged, as in teeth stripped, it would only shift at high RPMS, manually.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"


USN 1966-1970
WestPac 67-68 Tet I&II
Featured in Corvette Enthusiast Aug 2007 "Shark Attack"
Blue Green *** 454,4 Spd, Dark Saddle Leather, A/C, AM-FM St. (orig), PW, Tilt -Tele Wheel"

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Update:
Got my car back yesterday and all I can say is, I'm glad I have a great mechanic. First the vacuum modulator valve was apparently OK, 02 sensor OK; he couldn't explain the smoke coming from the exhaust or the shifting problem because neither occured while he had the vehicle. Nor have either occured since I got the vehicle back (I am considering the possibility of having experienced visual hallucinations).
I did have a power steering leak which was repaired and a bad alternator which was rebuilt and reinstalled. He said that would account for the dead battery, not just sitting in storage. He also replaced a fan belt and installed a shift indicator. Anti-freeze good to -35. I've been driving her around and so far, she is running great. Go figure. Hopefully I can focus on more innocuous questions for the rest of the winter
Paul

Moderator
... he couldn't explain the smoke coming from the exhaust or the shifting problem because neither occured while he had the vehicle. Nor have either occured since I got the vehicle back (I am considering the possibility of having experienced visual hallucinations)...
I HATE it when that happens!!
Glad to hear there's no problems, Paul!
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"





C3VR Lifetime Member #93
You may suspect the valve seals. They may have leaked while sitting and allowed some oil into the engine.
Three weeks is not too long for the car to sit. Mine often does that with no problems.

Being a flower child of the 70's myself I think that's pretty groovy man!
