Question about 1993 Chevrolet Corvette

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Hey Ginko, Steve here, I have a 93 LT1 Corvette w/ SOHC, The car has 118,000 mi. on it..Problem started about 4 weeks ago when I added coolant and bled the coolant system of air..Long story short, I killed the Opti-Spark..Diag code 16..Replaced complete Distributor,,Still no Spark..Replaced coil..Replaced Ignition Module..Still no start.Replaced ICM with old ICM and finally car started, but ran rough..then stalled..checked codes again. Now it's throwing a Code 41 which is Spark Timing..Im going crazy..any thoughts..Thanks in advance..

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Replace your knock sensor.

Posted on Nov 05, 2009

  • lorenzol74 Jul 26, 2011

    1993 corvette LT1
    I have exactly the same problem, so I took your advise changed the passenger side knock sensor car ran good smooth for a few minutes and went back to rough, I changed the driver
    side knock sensor car continues to run rough and gives code 41.

    Please HELP !
    email (



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What arm the specs for 95 camaro lt1 350

Block and Basics
Displacement: 350 cubic inches, 5733 cubic centimeters, 5.7 liters
Block Material: Cast Iron
Main Bearings: 2-Bolt Centers and Ends (The Corvette LT1/LT4 had 4-bolt mains)
Stroke: 3.48"
Bore: 4.00"
Compression Ratio: 10.4:1
Combustion Chambers: 54 cubic centimeters
Factory Redline Rating: 5700 Rotations Per Minute

Bottom End
Piston Material: (10159437) Eutectic Aluminum/Silicon Alloy
Connecting Rod Material: (10108688) Powdered Metal
Crankshaft Material: (12556307) Cast Iron

Top End and Valvetrain
Cylinder Heads: (10168448) Cast Aluminum, 2 valves per cylinder/16 valves total, ~212 CFM flow (Impala SS and Caprice heads were made of cast iron*)
Valve Diameter: (intake- 10241743, exhaust- 12550909) 1.94 intake, 1.50 exhaust
Valve Overlap: 41*
Valvesprings: (10206040) 85 lbs, seated
Camshaft Specs (12551705): 205/207 duration @ 50*, .447/.459" lift, 117 Lobe Seperation Angle
Rocker Arms: (10089648) 1.5:1 Stamped Steel
Timing Chain: (10128485) Powdered metal link

Intake and Fuel Delivery
Fuel Delivery: Electronic Fuel Injection, sequential port
Injector Size: (17124248) 3.0gps, 22lbs/hr speed density (1992-1993), 24lbs/hr mass airflow (1994-1997)
Throttle Body: 48 millimeter twin butterfly
Intake Manifold: (12552137) Aluminum

Factory Power Ratings
92-96 LT1 Corvette: 300bhp, 330lb-ft
1996 LT4 Corvette: 330bhp, 340lb-ft
1992 LT5 Corvette: 375bhp, 370lb-ft
93-95 LT5 Corvette: 405bhp, 385lb-ft
93-95 LT1 F-Body: 275bhp, 325lb-ft
96-97 LT1 F-Body: 285bhp, 325lb-ft
96-97 WS6/SS: 305bhp, 335lb-ft
93-97 Firehawks: 315bhp, 340lb-ft

Factory LTX Camshaft Specifications**:
1992 Y-body: 205/207 0.451/0.450 lift 117 LSA
1993-1995 Y-body, F-body: 202/207 0.450/0.460 lift 116 LSA
1994-1996 B-bodies (including L99 4.3L): 191/196 0.418/0.430 lift 111 LSA
1996 Y-body, 1996-1997 F-body: 200/207 0.447/0.459 lift 117 LSA
1996 Y-body, F-body LT4: 203/210 0.476/0.479 lift 115 LSA

hope this helps

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2 Answers

1996 Corvette LT1 rough idle with no codes

Dennis I have a 93 z/28 lt1 car and I find most issues are coil, icm, or optispark....O and i want to give u poines for my jaguar solution but dont know how also check out this lt1 forum...I am louvit on there....

Oct 07, 2011 | Cars & Trucks

1 Answer

I have 1991 corvette it shut down and when i started it back up it idled really rough and when i pressed on the accelerator it would not rev i had tohave the car towed however when i came home from wotk...

If your Corvette has the LT1 engine then it likely has a problem with the Opti-Spark distributor. These are a notorious problem with the LT1. It is mounted on the water pump and when that water pump seal starts to leak it leaks into the distributor housing causing condensation. Search the web for the various kits that fix this issue. there are several web sites that discuss the Opti-Spark and how to upgrade.

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1 Answer

93 Corvette bucks, misses, and backfires about 2.5K RPM

Has the Optispark distributor cap been replaced yet, if not have it replaced.

Nov 11, 2009 | 1993 Chevrolet Corvette

1 Answer

Torque specs on 93 corvette rod bolts lt1 engine

from the service manual.
Connecting rod nuts, tighten evenly to 20 ft pounds then turn another 55 degrees of rotation, seems odd but i have the factory manual

Nov 03, 2009 | 1993 Chevrolet Corvette

2 Answers

1992 Lt1 corvette will not start

bang the starter with a hammer, the solenoid may be sticking, if it works get a new starter, if it doesn't check the connections at the starter

Jul 30, 2009 | 1992 Chevrolet Corvette

1 Answer

Acceleration problem

Check to see if your water pump is leaking coolant from the weep hole. If it is, it may be causing to Opti Spark distributor to cut out.

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