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Comprehensive List of Technical Issues w/ C4s?

Rex S

Well-known member
Joined
Sep 2, 2009
Messages
270
Location
Bastrop, Texas
Corvette
1974, 1990 ZR1, 1992 ZR1, 1996 CE Roadster
LT1s water pump seeping around 60-70K and failure to replace will take out the OptiSpark.

LT1s coolant seep at R/H or L/H rear of intake manifold around 70-80K.

LT1s coolant leak at rear of head gasket 100K.

C4s wheel bearings developing play (zero tollerance part). I've seen them fail at 30K and also last past 100K. No ryme or reason to the failures.

Hatch struts 5-6 years from new.
 
C

CharlesBrown

Guest
cooling system

Low Coolant Level warning light on!. No biggie, but 'ya gotta burp it to get the light out.
 

Superc63

Active member
Joined
Mar 10, 2004
Messages
37
Location
Franklinville NJ (South)
Corvette
1993 Ruby Z07 x2, 1988 Dark Blue Z52
Overheating At Idle

Fuel Pressure Regulator Vacuum Line Leak (disconnected) causes overheating and blue smoke from the exhaust.

Head gasket failure could cause white smoke from exhaust...and I think overheating not just at idle. Could also cause water in the oil (looks like chocolate milk).

The radiator area between the AC condensor and radiator fills up with junk and needs to be cleaned.

Water pump failure, causes overheating at more than just idle...also coolant leaking from weap hole would be sign of failure.
 

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