Question about 1992 Chevrolet Corvette

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Rough Idle after winter in storage - 92 C4 convertible

'92 Corvette Convertible, LT1 auto trans. 115K miles
Kept it in storage for almost 1 year, now runs rough at idle esp in gear. Smooths out at >1500 rpm
After bringing it out of storage, I changed battery, oil, air filter. Oil level was high when changed, but not contaminated.
I suspect a vaccuum leak or fouled plugs - how should I go about finding/solving? Should I do simple things like change out the plugs and the PCV valve first, or go straight to more invasive methods to look for the leak?

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  • 232 Answers

Try a popular fuel stabilizer like Seafoam sold just about anywhere.

Posted on May 08, 2009

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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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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....http://ltxtech.com/forums/forum.php

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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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Cruise control not working, will not engage. No


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2006 corvette convertible power top went down fine will not go back up. checked trunk lid and storage area sensors


This is so old, i'm guessing you probably fixed it by now. But anyway, I had the same problem. It started to occasionally happen after my battery died. When it did happen, I would let both windows up, then push the up button on the convertible top. The windows would go down, then the top goes up. Worked every time. Hope this helps.

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