This type of carbon can even be caused by oil consumption, which will also cool the combustion chamber temperature. Carbon on the throat of the valve will absorb fuel, causing a lean condition and giving a similar result as to the previous lean condition.
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- Exhaust Gas Recirculation (EGR) is a system that allows the exhaust gases to be recirculated back into the intake manifold. This process leads to a significant reduction in nitrogen oxides (NOx) emissions because it reduces the two elements underlying its production: oxygen in excess and combustion temperature.
- The DPFE sensor MAY cause a lean condition where it detects the EGR is not open enough, and opens it further, introducing unmetered exhaust gases into your intake. However, a lean condition would cause an increase in idle speed, not decrease.
Mar 25, 2009 · yes if egr vave is not closing it will cause severe lean condition making it hard to start, the egr exaust gas recirculation valve it designed to open at cruising speeded under deceleration, it...
- A plugged PCV valve causes many other engine problems. Pressure begins to build and gaskets and oil seals may fail. These codes suggest a lean-condition in the engine. On some vehicles, a bad PCV valve can cause oil to blow onto the air filter element.
Nov 29, 2020 · Explanation: A lean code is enabled when the computer has detected enrichment adjustments have maxed out, with no results, this inability triggers the lean code. Lean Mixture Code Step 2 - Un-metered air which enters the intake system of the engine can cause a lean mixture code to be triggered, inspect all vacuum lines for cracks or dilapidation.
- I guess if the PCV system is pulling vacuum on the valve cover and the oil cap isn't sealing, it's conceivable that it could potentially cause a lean condition. 5.0l Mountaineer? -Seems to me that I could live my life, a lot better than I think I am.
Question: Can a bad EGR valve cause my vehicle to buck on acceleration and then stall out? Answer: Make sure this is the only code the computer is throwing; otherwise, look first into the other codes. A blocked EGR valve can cause combustion temperatures to rise, creating a lean condition...
- 1988 F-250 w/ Factory EFI460 & ZF. Previous owner decided to remove the EGR valve, and install headers. The dude failed to do anything about the electronics on it, so of course I have a Check Engine Light on, and it is running so rich that I can't stand to sit in the cab or drive it. It's bad...
A low reading could indicate a vacuum leak or possibly a leaking EGR valve. The performance of the O2 sensors can be measured using a scan tool, a DVOM or a labscope. Check to see if the O2 sensor responds correctly to rich and lean fuel conditions. A rich condition can be temporarily created with a propane enrichment tool and a lean ...
- Ran across this old post of mine and figured I should wrap it up. After 2 years and having the burb at 2 different shops with no result to the surging idle, I stumbled upon the answer at a Ford site. Surging idle can be caused by a number of different problems. IAC, EGR, EGR controller, MAP, temp sensor, vacuum leaks, O2 etc.
Fuel contamination - In trace amounts, water , near the in-tank fuel pump inlet can be added to the injector. water results in a lean exhaust condition and can set DTC P0171. Check for poor O2S or MAP sensor connection at the ECM.
- The EGR system used on an 1994 toyota 4runner is the same as the camrys of the same vintage and it's a complex one. It's vacuum AND back pressure modulated and presents a good challenge for even the best shade tree mechanic. Here's how you diagnose the system.
Make sure while the EGR is off the car that you clean out the exhaust and intake ports, too. And before putting the EGR back on, start your car up for 2 seconds or so, to blow out even more coke. Scudo, You mean the idle speed controller, yes? Not the air valve.