Quote:
Originally Posted by B17 Crew
Went to look at this ‘91 this afternoon, it’s number 360. It’s a one owner car, unmodified with the exceptions of an update to ‘92-‘96 exhaust and Hella headlights. The body is straight, panel fit is very good, I could not find evidence of an accident. Original window sticker and some other documentation come with the car. I was unable to drive it this visit, it was heavily blocked in by other cars in the back of the showroom. I was able to start/rev the car. Was able to talk to the owner of the dealership, he did not try to mislead me and appeared to be a straight shooter as well as knowledgeable about Corvettes.
Link to Z:
http://www.arenamotor.com/1991-Chevr...043201/6403086
What it needs:- New tires all around.
- Headlight motors continue to run for about 3 seconds after turning lights on/off.
- Driver’s side bolster motor sounded “weak”.
- Professional buff to remove fine scratches in clearcoat
- Steering column needs attention. Has play in it (this may be from the driver using it to ingress/egress the car).
- Driver side leather bolsters heavily worn.
- Grey triangular tabs missing (by power seat controls).
What I noticed:- LT-5 engine cranking takes several seconds longer than my LT-4. Normal, they are designed to crank longer
- There was a vibration with an audible “bumping sound” at start up that subsided after about 20 seconds. Not sure if vibration was from engine or clutch. A number of possibilities could be some or all. Bad injector, bad dual mass flywheel, coil issue or all of the above. Mostly likely bad injector causing the flywheel it make noise.
- Pre ‘94 type style seats are not as comfortable/supportive as ‘94-‘96 seats (IMHO).
- This ‘91 is not as tight/sold in regards to interior fit and finish as my ‘96 LT-4 which has 60K miles on it, the Z has 74K miles.yup, they made some progress in 5 years
- It has slight delimitation on windshield but did not affect outward vision.Normal, ZR-1 uses a special windshield.
- Exhaust tips are not aligned, seem off-angle. Can be seen in rear photos of car. Those are later version mufflers but is fixable.
My main concerns were the vibration/audible “bumping sound” at start up and headlight motors continuing to run which make me question if the car has electrical gremlins. Dealer has it listed for 20k but will take 17k. I look forward to and would appreciate any input on the car. Thank you.
B17Crew
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Welcome to the addiction...
Answered some of your questions above.
Here a list of things to look at. I'm sure I missed few but here you go. Frankly, to me, $17k is high for a 91 in this condition and miles that potentially needs work.
Known issues for the ZR-1, some related to higher miles some not.
Injectors - 90-92 must be replaced.
Vacuum leaks to the secondary throttle system.
Secondaries operable?
Ingnition coils and wires replaced?
Timing chain noise at start (normal to a some degree on 90's)
Starter, does the car start consistently
Oil leaks especially the pan and oil cooler lines
Fuel pumps, have they ever been replaced?
Is it throwing any engine, abs or body codes (SES light on?,multiple possibilities here)
Are any DIC lights on. (Multiple possibilities here as well)
Is the adjustable shocks system working
Windshield delamination
A/C functionality (compressor is unique to the Z, cooling capacity lower)
Power switch functionality and keys (are there 2)
Transmission syncro's, (first gear is always noisy) shifter alignment can mimick synco problems.
Clutch functionality (they all let in high, was it ever changed)
Egr system on later models
Engine mounts
C4 Issues
Head lights operable
Radiator blocked or simply clogged, electric fans operable
Wheel bearings
Suspension bushings
Condition of all door, top and hatch seals
Glass roof cracking
Instrument cluster functionality especially the tach (tends to read high with age) also note the lighting of the cluster.
DIC button functionality
Steering wheel excessive movement
Radio functionality (especially speaker amps) and antenna
Sport seat functionality (transmission, switches, pumps and bladders)
Door window switches
Door window lifter and internal rattles
Fuel tank bladder collapse (results in small capacity)
Differential noise (whine)
Good luck
H
