Hey guys Itook my car to mechanic because my engine light was on and the code showd that it was unsufficient egr lift or something like thatthey had changed the egr valve before so this time they said there was carbon build up and they cleaned it and my car runs great now. i don‘t have problem with accelaration and the engine doesn‘t stall when i stop, BUT the light came on again and still shows the same code. I am sick of it!!! anybody knows what else could it be? It‘s 94 honda accord with 140 000 miles on it.
Hi Val, It sounds to me like the repair shop made a mistake here, they replaced a part without addressing the condition. If you had a fault for ERG insufficient flow , it would be caused by excessive carbon build-up in the intake manifold or the upper intake plenum, depending on engine. If you had a problem with stall at idle and a fault for excessive EGR flow the culprit would be loose carbon particles lodging in the EGR valve pintle and keeping it open. In either case the carbon needs to be physically removed, this would involve removing the intake manofold and or upper plenum Good Luck!
Inside the EGR valve there is a coil spring that exerts pressure on a diaphragm valve. The diaphragm valve has a large light weight washer in the middle that controls the plunger (heart of the valve) that opens when the car is at higher under motion and closes when the motor is at idol. It's purpose is to allow a measured amount of exhaust gasses to flow back through the intake manifold to help lower emissions. The trouble is, it is a pure mechanical vacuum devise that wears out and not respond to the vacuum supplied to it. In reality the valve gets dirty and stick open or closed because carbon caused no-name or low octane fuel. Your best bet is to have it replaced.
The hose may puncture some where,their could lose tappet cover you could have blown inlet gasket.Regards Martin.
