The Z28 was the only V8 Camaro offered in 1994. The SS trim didn’t become available until 1996
The LT1 V8 employed many unusual engine technologies, such as a reverse-flow cooling system with a gear-driven water pump
The LT1 also features GM’s “Opti-Spark” – a high resolution optically triggered ignition system that could measure crank position 360 times per rotation. This was achieved with an optical sensor aimed at a slotted spinning wheel containing 360 slots. The wheel is connected to the spinning camshaft
The Opti-spark ignition system was powerful enough to start the engine within sixth tenths of a second of turning the key – even during cold weather
Opti-spark was superior to a conventional distributor in many ways. During sudden rapid acceleration, for example, ignition variation can be skewed up to 30 degrees with a traditional distributor. With Opti-Spark, the timing variation can only be a maximum of one degree off
While the concept worked, early versions were notoriously troublesome thanks to a fatal flaw – the housings were known to collect and trap moisture. The water would literally blind the optical sensor to the point where it couldn’t properly distinguish the spacing between the slots on the spinning wheel. This resulted in a crossfire/misfire – similar to what a cracked distributor cap would cause. But that was just the beginning
As the moisture builds up, it would begin to flow throughout the crevices within the Opti-Spark. Since electricity takes the path of least resistance, the high-energy secondary voltage would eventually follow the moisture down into the cap and bridge the spark plug under cylinder pressure. The high voltage would either burn through the rotor or the slotted wheel, completely shutting down the engine
Thankfully, GM caught on to this issue and released an Opti-Spark with an updated housing on ’95 models (’94 for Corvettes). The new housing was vented, allowing any trapped moisture to escape. It even came with a serviceable cap and rotor, for good measure (the early units weren’t serviceable at all). In the end, Opti-Spark was a revolutionary breakthrough in ignition technology that was spoiled by an improperly designed housing
Key Model Year Changes:
First year of the electronically controlled 4L60E automatic transmission – now requires brake pedal to be pressed before shifting from park
First year of sequential port fuel injection, precisely matching fuel delivery for each cylinder (replacing multi-port injection)
First year of R134a air conditioning
ECU logic is changed to a Mass Air Flow style (replacing the old Speed Density style)
ECU no longer uses a removable chip and can be reflashed only
“ASR Off” was added to the dash, despite the fact that delays at the factory meant ASR didn’t arrive until 1995
Gauges are now use white numbers/marking rather than yellow
All Z28’s received updated front brakes
Half way through the model year, the cooling fans were switched from a “parallel” wiring to a “series” wiring setup. The fans would only operate at 12 volts during high RPM operation – otherwise, they would run on 6 volts only
13k original miles
All original paint and glass in excellent condition
Garaged in CA its entire life
Original floor mats, indoor car cover, two sets of keys, all original books/literature and maintenance records included
Location: Costa Mesa, California – (more photos below)
*SAE rated from factory. May not reflect current output.
*Performance numbers pulled from either the factory brochure or reputable automotive road tests.
*Base price when new does not reflect original MSRP of this particular car, nor does it reflect what the original owner paid for it.
*Advertised price at time of posting. Sellers can raise or lower prices on their original ad at any time. Click on the original ad to view current price/availability.
Mileage Disclaimer: NOC has not confirmed if the mileage stated by the seller is true and accurate. It is up to the buyer to verify these claims. Vehicle history reports, service records stating mileage, and even inspections of odometer tampering are recommended.