| I see another post below concerning 'soft valves'. Man, I wish this subject would die the death it deserves. I've posted extensively on the subject. The problem existed over 15 years ago, affected a very few cars that were imported into the US, showed up within two years or approximately 35k miles and was fixed under warranty most of the time. Some facts: the Nissan Technical Bulletin that applies was issued in July, 1993, entitled "1990-91 300ZX Rough Idle". Its number is NTB93-105 (which is the sequence number for all NTB's issued in 1993) or EM93-001 (which is the designation Nissan uses in its Engine Mechanical section of the Service Manual). It applies to engines with serial numbers (NOT vehicle serial numbers!) lower than VG30-777599 for NA's and VG30-619550 for TT's. The applied date for engine manufacturing was prior to June 22, 1990 for NA's and December 11, 1989 for TT's. Please keep in mind that the VG30 engine was used also in the Z31's, and the serial numbers have no relationship to the car's VIN. Nissan estimated that about 350 US Z32 cars MAY HAVE HAD engines with soft valves in them. The bottom line: this problem isn't a problem any more unless your 1990-1991 car has less than about 50k miles on it, and happens to be one of the 350 or so that Nissan 'THINKS' were sent to the US with soft valves in the first place. If you look at sales figures for the 1990-1991 model years, approximately 45k cars were sold in the US. So, the statistical chances are less than one percent to begin with. Those odds are about the same as winning the lottery. Those of us who have cars that were made during the period covered by the Nissan Technical Bulletin should rest easy if our cars have more than 50k miles on them - it's not gonna show up. And if it did, then there's no recourse: Nissan closed the warranty repair when the warranty ran out. The latest point for that to happen was in 1994, eleven years ago. People, get over it! Tom Bell
tt.net member 69
IZCC 2802
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'Soft valves' - 
