Why is the EGR not working on my 1975 Corvette?

If you have a 1975-1981 car the EGR valve is most likely not functioning. The 1975-1981 cars had the EGR system removed or plugged because they caused hesitation and stalling. When EGR systems are disabled, the exhaust passages have a tendency to build up carbon, blocking EGR flow. If the EGR valve is stuck open the engine will not idle.

Where is the EGR valve on a LT1 engine?

It’s important to know where the EGR is located in your LT1 engine and how to remove it in case you need to clean or replace it. Place your car’s transmission in “Park,” turn off the LT1 engine and allow it to cool with the engine off. This will ensure components are cool to touch and prevent possible burns. Locate the EGR valve under the hood.

How do you remove an EGR gas valve?

Set the bolts in a safe location for reinstallation. Disconnect the valve by pulling the electrical connector out of the top of the valve. Place the electrical connector to the side. Locate the gas feed hose, which is on the side of the valve. Pull the hose out of the valve. Now you can remove the EGR valve.

Why is the PCV valve important in a corvette?

PCV (Positive Crankcase Ventilation) valves are very important for proper engine performance. The PCV valve allows a pressure drop (vacuum) in the engine’s crankcase; this helps piston rings seal. The engine oil stays cleaner because moisture and oil vapors are burned off.

Where is the EGR valve on a car?

The EGR Valve (Exhaust Gas Recirculation) valve is found on almost all modern engines and is considered part of the emissions package of your vehicle.

What happens when the EGR is blocked off in a car?

The carbon dioxide, along with burnt exhaust gases, enters through the EGR valve into the intake to reduce harmful NOx (nitrogen oxide) emissions, but it also cools the combustion chamber. If the EGR has clogged, it will allow a noticeable temperature rise in the engine.

How does the EGR valve affect Wot performance?

It has absolutely 0 effect on WOT performance and I’ll explain why in this article as well as tell you how clever this little valve really is. The EGR valve does not open under heavy load (I am unaware of any exceptions) and therefore, you will not be burning exhaust gasses while at wide open throttle.

What causes a steady miss at idle and under load?

If you have an unexplained miss at idle and under load there are two possible causes that can be difficult to find in some situations. A worn camshaft will cause a steady miss. A slightly worn camshaft lobe will possibly have only a minor tapping noise occur.

Why is my Chevelle 350 hard to start?

Fuel pump check valve doesn’t maintain pressure in the fuel rail so it boils and then you have to crank excessively to get rid of the vapor before it will start. Bought a 1972 Chevelle 350 a couple years ago. Every time I drove it it wouldn’t restart easily or sometimes not at all unless I waited a while.

What causes a rough idle with an EGR valve?

Rough idle. One of the most common symptoms of a problem with the vehicle’s EGR valve is a rough idle. It is not uncommon for EGR valves to malfunction and become stuck in the open position. This can lead to exhaust gas recirculation to occur causing a rough idle even when the conditions are not desirable.

Can a car pass a smog test with a faulty EGR valve?

The EGR valve is an important emissions component, especially for vehicles in states with strict emissions regulations. You won’t be able to pass a smog test with a faulty EGR valve.

How did exhaust gas recirculation ( EGR ) come about?

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.

Why is the EGR not working on my 1975 Corvette?