Common questions

What happens when you start a C4 Corvette?

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What happens when you start a C4 Corvette?

When starting an L-98 Corvette engine, a sequence of events take place that precedes the engine running. Knowing these sequences will help you troubleshoot no start issues with your C4 Corvette. C4 Corvette Start Sequence begins when you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails.

Why was 1980 such a bad year for corvettes?

Whoever signed off on this rolling monument to bad taste should have been hanged, or better yet, forced to drive one. It would have been more painful. In general, 1980 was a lousy year. Inflation was rampant, the economy was in the doldrums and the Corvette was awful.

Why did Chevrolet give up certifying the corvette?

Inflation was rampant, the economy was in the doldrums and the Corvette was awful. But in California it was doubly awful, as Chevrolet that year gave up trying to certify the Corvette’s 350-cubic-inch V8 for that state’s more stringent emissions requirements.

What kind of engine did the first Corvette have?

The engine was the old Blue Flame six with mechanical lifters and a compression ratio boost to 8.0:1 to produce a modest 150 hp. And, notoriously, the only transmission available was a two-speed Powerglide automatic. The big problems, though, came in actually building those first Corvettes.

Why is my Corvette overheating?

While there are a variety of reasons your Chevrolet Corvette is overheating, the most common 3 are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.

What is the reliability of a corvette?

Chevrolet Corvette Reliability Rating. Reliability rating based on the cost, frequency, and severity of actual repairs. Chevrolet Corvette Reliability Rating Breakdown. The Chevrolet Corvette Reliability Rating is 3.0 out of 5.0, which ranks it 23rd out of 24 for midsize cars.

Are corvettes reliable?

Overall the newer corvettes (C5-C6) are very reliable. They don’t have a ton of high tech in them, so there is little to go wrong electrically. The motors and transmission are also tried and true designs that have been around for a very long time in some form or fashion.

What engine is in a 1986 Corvette?

Chevrolet Corvette, 1986 MY 1YY07. Chevrolet Corvette is an automobile that has a 2 door coupé body style with a front located engine delivering its power to the rear wheels. The Chevrolet Corvette’s engine is a naturally aspirated petrol, 5.7 litre, overhead valve 90 degree V 8 cylinder with 2 valves per cylinder.

What’s the problem with my 1989 Corvette Vette?

No noticeable performance issues, the light just comes on, it … The top on my 1989 Vette won’t release when I pull the release handle. It comes open on the passenger side but not the driver’s side. What can I do?

Where is the temperature switch on a 1985 Corvette?

The temperature switch on the right would be found on 1985-1986E engines with cast iron cylinder heads screwed directly into the EGR valve. 1986L-1989 engines have the switch installed in the EGR transfer tube between the exhaust and intake manifolds. The next phase would be to test the valve itself.

When did corvette start using exhaust gas recirculation?

1984-1996 Corvette EGR Diagnosis. Exhaust Gas Recirculation (EGR) came about in 1975 when catalytic converters were introduced. The inert exhaust gas was used to quell the increased heat in the engine’s cylinders from the lean fuel mixtures required to keep the catalytic converters from melting down.

What should the oil pressure be on a C4 Corvette?

The reading will drop to 38-40 pounds after the engine is running. Initial C4 Corvette Start Action: Once rotating the key to the start position if the anti-theft system has not disabled the starter the engine will rotate. Once the oil pressure has reaches 4 PSI, the oil pressure switch contacts will close allowing the fuel pump to run.

What should the coolant temperature be on a C4 Corvette?

After the C4 Corvette Start Sequence is finished the Oxygen Sensor (mounted in the exhaust pipe) indirectly is considered to have reached operating temperature of several hundred degrees when the Manifold Air Temperature (MAT) sensor shows an intake air temperature of more than 140 degrees and the Engine Coolant Temperature (ECT) is 160 degrees.

When did GM start using MAF system in C4 Corvette?

GM used this approach in the 1990 and 1991 L-98 engines and in the 1992 and 1993 LT-1 engines. With the 1994 model C4, they went back to the MAF system. Note that MAF based systems are far more accurate since they measure air flow directly whereas the MAP system calculates air flow indirectly.

When starting an L-98 Corvette engine, a sequence of events take place that precedes the engine running. Knowing these sequences will help you troubleshoot no start issues with your C4 Corvette. C4 Corvette Start Sequence begins when you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails.

What should the fuel pressure be on a C4 Corvette?

C4 Corvette Start Sequence begins when you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails. There is a Schrader valve on the passenger side fuel rail near the rear of the engine and proper fuel pressure after the pump runs should be between 40-42 pounds of pressure.

What causes a Chevy Corvette 86 TPI to stall?

It never stays constant. Its stalling under a minute after start up, and it will stall once the idle drops if I rev it while its in P. Also stalls sometimes when shifting into gear (from R to D). I tried changing out the fuel pump with a new one, but then it would not start.

After the C4 Corvette Start Sequence is finished the Oxygen Sensor (mounted in the exhaust pipe) indirectly is considered to have reached operating temperature of several hundred degrees when the Manifold Air Temperature (MAT) sensor shows an intake air temperature of more than 140 degrees and the Engine Coolant Temperature (ECT) is 160 degrees.

What’s the idle speed on a 1991 c4vettes L98?

For information on the 1990 and 1991 L-98 variant, see the Note below). The engine should show an initial idle speed of around 900-1100 RPM and then slowly diminish to 600-700 RPM unless the air conditioner is on in which case it will run at around 800 RPM.

What are the bolt on mods for a C4 Corvette?

The following is a basic guide to the best bolt-on mods for your C4 Corvette. To boost performance to an optimum level in any engine, including that of your C4, excess combustion gases must be expelled from each cylinder upon its given exhaust stroke in as efficient a manner as possible.

How does the vortex Ram work on a C4 Corvette?

The Vortex Ram Intake System seeks to alleviate the C4’s often-discussed restrictive air inlet. This system utilizes a “scooped” housing and Internal Velocity Vortex Stack to funnel and cool substantial volumes of air, which is then sent into the intake.

What kind of fuel injection does a corvette use?

For 1985, Chevrolet replaced the Cross-Fire system with a new Tuned-Port Injection (TPI), a fancy way of saying port type fuel injection, on the Corvette’s 5.7 liter V8 thus changing the RPO code to L98.

What kind of cross fire intake does the L83 have?

Performance Plus Systems (now a defunct company), released an aftermarket free-flow Cross-Fire intake, called the X-Ram for the L83. On the outside the X-Ram looked exactly like the L83’s stock intake however inside it had a flow rate of 1440 cfm versus the stock intakes’s 475 cfm.

What kind of engine did the 1982 Corvette have?

Since both the 5.7 and 5.0 liter V8s were part of Chevrolet’s small-block V8 family, they had the ability to interchange parts. Chevrolet decided the 1982 Corvette would come standard with TBI equipped 5.7 liter V8 and the Camaro Z28 would have as its optional engine, a TBI 5.0 liter V8.

What’s the average quarter mile time of a corvette?

We also created a chart for those of us who like to see things visually. As you can see the Corvette just gets faster and faster every year and in terms of Corvette quarter-mile times, it has consistently chipped away at those times to now be in the low 11 second times which is just crazy.

No noticeable performance issues, the light just comes on, it … The top on my 1989 Vette won’t release when I pull the release handle. It comes open on the passenger side but not the driver’s side. What can I do?

What was the horsepower of a 1988 Corvette?

For 1988, a new high-left camshaft helps increase horsepower to 245 at 4300RPM and torque to 340 at 3200 RPM. This high-output V8 combines with a choice of transmission: standard automatic with 4 th gear overdrive or the no-cost-option 4-speed manual.

What kind of seats does a 1988 Corvette have?

Deeply contoured standard Sport Cloth reclining bucket seats with integral head restraints (leather seat trim optional)

Is it hard to start a 1988 L98 auto?

1988 L98 Auto. recently aquired. hard to start from cold start. literally 3-7 seconds on the starter. New wires, not plugs. new cap and rotor. trust me being a Jeep guy I know oil smoke smell. Once she is running, she starts slow then idles fine. after that no performance issues.

What causes an L-98 corvette to start?

When you start an L-98 engine Corvette, a series of events take place that causes the engine to run.   Knowing the sequence will help you troubleshoot no start conditions. Fuel Rail Pressurization: When you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails.

What’s the idle speed on a 1989 c4vettes L98?

(This is how the 1985 through 1989 L-98 works. For information on the 1990 and 1991 L-98 variant, see the Note below). The engine should show an initial idle speed of around 900-1100 RPM and then slowly diminish to 600-700 RPM unless the air conditioner is on in which case it will run at around 800 RPM.

How does the engine start in a C4 L98?

  (In the L98, all injectors on one side of the engine fire at the same time followed by all injectors on the other side firing at the same time.   On the LT-1, the injectors are fired individually at the appropriate time). The ECM will also pull in the fuel pump relay in effect paralleling it electrically with the oil pressure switch.

What’s the C4 diagnostic code for a corvette?

62 Pass-key – key #2 programming resistance out of range 71 LCD dimming output circuit shorted to battery or CCM internal open circuit 72 LCD dimming output circuit open or shorted to ground 73 LED display dimming output circuit shorted to battery or CCM internal open circuit 74 LED display dimming output circuit open or shorted to ground

How does the ECM work on a C4 Corvette?

Brainiac Fact for C4 Corvette Start Sequence! The ECM also pulls the fuel pump relay which makes the contacts and parallel’s it electrically with the oil pressure switch. This way if the fuel pump relay fails you can still normally get the car to run. This will only happen if you make at least 4 PSI oil pressure.

What causes a C4 Corvette to start off wrong?

Errors and vacuum leaks can throw the calculation off and Corvette returned to the MAF system beginning with the 1994 C4 (with a MAP backup). From a troubleshooting standpoint, the MAP operation comes into the sequence the same place that the MAF does.

What kind of engine does a 1994 Corvette have?

1994 Corvette Overview Model: 1994 Corvette Generation: C4 Corvette Type: 2 Door Coupe, 2 Door Convertible Available Colors: Arctic White, Admiral Blue, Black, Brigh Engine: 350CI, 300 Horsepower, Multi-Port Fuel I

Why did the C4 Corvette go back to MAF?

With the 1994 model C4, they went back to the MAF system. Note that MAF based systems are far more accurate since they measure air flow directly whereas the MAP system calculates air flow indirectly. Errors and vacuum leaks can throw the calculation off and Corvette returned to the MAF system beginning with the 1994 C4 (with a MAP backup).

What’s the start sequence on a C4 Corvette?

Knowing these sequences will help you troubleshoot no start issues with your C4 Corvette. C4 Corvette Start Sequence begins when you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails.

Brainiac Fact for C4 Corvette Start Sequence! The ECM also pulls the fuel pump relay which makes the contacts and parallel’s it electrically with the oil pressure switch. This way if the fuel pump relay fails you can still normally get the car to run. This will only happen if you make at least 4 PSI oil pressure.

GM used this approach in the 1990 and 1991 L-98 engines and in the 1992 and 1993 LT-1 engines. With the 1994 model C4, they went back to the MAF system. Note that MAF based systems are far more accurate since they measure air flow directly whereas the MAP system calculates air flow indirectly.

What kind of idle does a 1992 Corvette have?

ON MY 1992 LT1 CONVERTIBLE, I HAVE A HIGH IDLE (1800). I HAVE REPLACED TPS, IDLE AIR CONTROL VALVE, CLEANED THROTTLE BODY, CHECKED THE TPS MODULE.

When did the C3 Corvette go out of production?

The C3 Corvette was amidst its death throes during the 1982 model year. In its 15th year of production, it had few fans left and open derision was the norm among enthusiasts. The C3 had overstayed its welcome by at least five years.

How many degrees of advance does a corvette have?

If you look at the centrifugal advance calibrations for these “ported spark, late-timed” engines, you’ll see that instead of having 20 degrees of advance, they had up to 34 degrees of advance in the distributor, in order to get back to the 34-36 degrees “total timing” at high rpm wide-open throttle to get some of the performance back.

Why is spark timing advanced in a corvette?

This requires that lean mixtures have “the fire lit” earlier in the compression cycle (spark timing advanced), allowing more burn time so that peak cylinder pressure is reached just after TDC for peak efficiency and reduced exhaust gas temperature (wasted combustion energy).

What happens when the ECM goes bad on a corvette?

As mentioned above, the ECM controls the engine timing, and air/fuel ratio. So, when it goes bad, it can knock your Corvette’s air fuel ratio off. This could lead to poor fuel economy, the previously mentioned rough running engine, backfiring, a flashing check engine light, and an engine that has no giddy-up and go.

If you look at the centrifugal advance calibrations for these “ported spark, late-timed” engines, you’ll see that instead of having 20 degrees of advance, they had up to 34 degrees of advance in the distributor, in order to get back to the 34-36 degrees “total timing” at high rpm wide-open throttle to get some of the performance back.

As mentioned above, the ECM controls the engine timing, and air/fuel ratio. So, when it goes bad, it can knock your Corvette’s air fuel ratio off. This could lead to poor fuel economy, the previously mentioned rough running engine, backfiring, a flashing check engine light, and an engine that has no giddy-up and go.

This requires that lean mixtures have “the fire lit” earlier in the compression cycle (spark timing advanced), allowing more burn time so that peak cylinder pressure is reached just after TDC for peak efficiency and reduced exhaust gas temperature (wasted combustion energy).

What are the specs of a 1984 Corvette?

1984 Corvette Specs Type: V8 Valve Location: In Head Bore / Stroke: 4.00″ / 3.48″ Displacement: 350 Cubic Inches (5.7 Liters)

How tall is the front bumper on a 1984 Corvette?

2 inches Overhang (Front) 40.5 inches Overhang (Rear) 39.7 inches Front Track 59.6 inches Rear Track 60.4 inches Length 176.5 inches Ground Clearance Differential to Ground 6.8 inches Ground Clearance Front Bumper to Ground 5.2 inches Ground Clearance Rear Bumper to Ground 13.2 inches

What causes a Corvette engine to not start?

This flow chart might help. When you start an L-98 engine Corvette, a series of events take place that causes the engine to run. Knowing the sequence will help you troubleshoot no start conditions. When you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails.

C4 Corvette Start Sequence begins when you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails. There is a Schrader valve on the passenger side fuel rail near the rear of the engine and proper fuel pressure after the pump runs should be between 40-42 pounds of pressure.

How does the C4 Corvette start and stop?

Brainiac Fact for C4 Corvette Start Sequence! The ECM also pulls the fuel pump relay which makes the contacts and parallel’s it electrically with the oil pressure switch. This way if the fuel pump relay fails you can still normally get the car to run.

Why does my Corvette Vette not start up?

A lack of fuel pressure will prevent the car from starting. Check your fuel pressure. If you have zero pressure, the car won’t start. Check relay number 35 in the engine compartment fuse box, which controls the fuel pump.

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Ruth Doyle