Car won’t go past 30 mph
I replaced the EGR sensor a day ago and the hoses blew on it. This is the second time in 4 days I've had to replace it. Also, when I put the EGR sensor on (correctly) it makes my car go from slower to even slower. I already have problems accelerating. I cannot go past 30 mph but when the EGR hoses popped off I could go faster. Not familiar at all with this sort of stuff. Just know how to do regular maintenance. What would cause my car to not accelerate? What would cause the hoses to blow off?
My car has 176000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi. It sounds like the ports to the EGR valve are clogged up with a lot of carbon causing back pressure in the engine and that chokes the engine causing the car only to go 30mph. When the EGR valve hoses blew off it released some of that pressure allowing the car to pick up speed. I suggest you have the EGR valve ports cleaned out and also have a fuel induction service done by a certified technician, such as one from YourMechanic.
How to Identify and Fix Common car Problems ?
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Check engine light: as with most engine management components, a problem with the EGR valve may trigger the check engine light. Engine performance issues: if the valve is stuck open the vehicle`s air-fuel ratio will be disrupted causing engine performance issues such as reduced power, poor acceleration and rough idle.
Open Position: Rough idling and problems with acceleration are the two most common indicators that the EGR valve is stuck open. The truck might also stall excessively. When the EGR valve is stuck open, all of the exhaust gas cycle back into the chamber, meaning there`s not enough oxygen for a combustion to take place.
If the jammed EGR valve is not repaired or replaced quickly, all sorts of problems may occur. Four of the most common are rough running, high fuel consumption, turbocharger failure and, sometimes, total engine failure.
EGR Fraction Based Control
Critical sensors are an exhaust manifold pressure sensor (P2), an intake manifold pressure sensor (P2) and a speed density estimate of total mass flow. Exhaust and intake manifold pressures are used to control the EGR valve and VGT vanes.
The rise in smoke (soot) level of engine exhaust due to EGR affects the engine performance in various ways. Increased soot level causes considerable increase in the carbon deposits and wear of the various vital engine parts such as cylinder liner, piston rings, valve train and bearings.
When an EGR delete works properly, it increases the oxygen density in the engine. That means a boost in horsepower. However, it is essential to consider how much of an increase you get. Usually, it is minimal.
Symptoms of an EGR valve that is stuck open include rough unstable idle and stalling. Often a car stalls when stopping after exiting the highway. If the EGR system is clogged up, or the valve is stuck closed, the combustion temperature increases.
In general, the EGR valve operates at partial throttle and under 2,500 rpm. It is part of a complex regulated circle steered by the engine control unit. The ECU uses data supplied by various engine sensors and RPM speed to calculate how much exhaust needs to be recirculated and instructs the EGR valve accordingly.
In some cases, a mechanic can fix the issue simply by cleaning any deposits off of your EGR valve. If the build-up has led to mechanical damage, however, you may need to have an entirely new EGR valve installed. The EGR valve plays a key role in both emissions control and engine performance.
Disadvantages of EGR Delete
Some diesel vehicles can experience adverse effects like reduced horsepower, increased exhaust gas temperature and engine knocking. In some cases, it can be more beneficial to have an EGR valve replaced, rather than bypassed.
Typically driving the vehicle for 100 to 200 miles will clear the system, so you might want to have a professional mechanic take a stab at it with their equipment if it doesn`t clear up in the next week or so.
The results of this failure can damage a number of different EGR system components, including the VGT turbo. Most failures happen inside the EGR cooler, so it`s easy to miss until symptoms start to show up elsewhere. Don`t let a failing EGR cooler keep your diesel engine down!
Technically you can drive without a working EGR valve.
It won`t affect the health of your engine, but it will hurt the environment. The role of your EGR valve is to reduce the number of toxic NOx gases in the air, so if it isn`t working quite right, more toxic gases will be released into the air.
As well are reducing NOx, EGR valves can be used in downsized GDi engines to reduce pumping losses and improve both combustion efficiency and knock tolerance. In diesel, it can also help to reduce diesel knock at idle.
As well are reducing NOx, EGR valves can be used in downsized GDi engines to reduce pumping losses and improve both combustion efficiency and knock tolerance. In diesel, it can also help to reduce diesel knock at idle.
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Read Full Q/A … : Car won’t go past 30 mph
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