A mechanic will be able to perform a smoke test to rule out vacuum leaks. A smoke test injects smoke into the intake system. If there is a leak in the system, smoke will come out from an area it’s not supposed to. Read also: 5 Symptoms of a Bad EGR Valve and Replacement Cost. 3) Overheated Engine G8orFord. 9897 posts · Joined 2014. #2 · Jan 3, 2017. The clogged oil cooler is likely the root cause of the ruptured EGR cooler. Starving the EGR cooler from getting coolant flow allowed it to get super hot from exhaust gasses and eventually fail. It's possible that the headgaskets aren't compromised, but getting it flushed (oil and coolant The following were issues that caused the high idle: 1. Dirty TB (wasn't closing all the way) 2. EGR metal tube leaking (the leak was after the valve, before the intake manifold) 3. EGR rubber hoses leaking. 4. Most likely other rock hard rubber hoses connected to the TB and intake manifold. As wall as, leaks around the (PCV) valve and (EGR) valve. A leak is a problem that creates both, poor fuel economy and a loss of power in the vehicle. The ultimate bad news is, damage to the engine itself. A Bad (EGR) Valve. An (EGR) valve, that fails to close at idle, is another common cause of stalling. For a P0401 (insufficient flow) or P0402 (excessive flow) the PCM will monitor the following components during the test sequence shown above: EGR valve pintle position – if the EGR valve is electrically controlled. MAP sensor – if the EGR valve is vacuum controlled the PCM will read changes in the MAP sensor output in response to exhaust If so, that's residual oil in the EGR cooler that is pushed out slowly under boost through the leaky gasket. The oil comes from the PCV vapor in the intake. If you're re-installing the factory intake elbow, replace the gasket or fix the leak and ther oil won't come out. Best option is to kill the EGR cooler and put a better flowing elbow on it. 3nJy9n. 3. Exhaust Manifold Failure. Exhaust manifolds bolt up to the engine cylinders and the exhaust system. They transfer used engine air to the exhaust system where it is then released into the atmosphere. On the Triton 6.8, the bolts or studs that connect the manifold to the engine block are prone to rusting and failing. Answer: Several faults can cause this. Check the idle air control (IAC) motor; the EGR valve may be stuck open; a leak in the throttle body gasket or intake manifold may also lead to this issue. I believe your vehicle may have a code reader connector in the engine compartment. Check your vehicle repair manual or with your local auto parts store. A PCV valve leak can cause the air-fuel mixture to run too lean, and this will cause a rough idle. PCV valve. Proper periodic servicing of the PCV valve will prevent this situation from occurring. The fix is to service the valve regularly and make sure that it is clean and fully operational. When a valve cover is bad, you may notice an external oil leak. This would also lead to a lower oil level than expected. Depending on where the oil is leaking, you may also smell something burning. This problem can also cause oil in the spark plug wells, a misfiring engine or dashboard warning lights. Also, make sure there are no loose or broken wires before assuming this as a possible cause. 8. Burned exhaust valves. These can be a result of a rich fuel mixture or oil contamination from internal engine parts. If your car only has the P0420 trouble code, then you’re most likely looking at leaking/bad valve seals. If not the egr valve can cause stuff like that with no codes. Also the VGT can stick !Usually with a code thou. Try lubing the little lever on the turbo with some Penetrating oil see if that helps! Next time your by the shop have 68 stroke out the turbo to make sure its calibrated or holding it's calibration.

can a bad egr valve cause oil leak