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Oil leak I have an oil leak on the egr valve on the vacume diaphrame what can couse this ?

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  • Cars & Trucks Master
  • 5,341 Answers

Check if the oil is coming from somewhere else. There is no oil or oil passages at the egr valve. The vacuum diaphragm is a ported vacuum signal (from just below the throttle valve, ported vacuum means it only gets vacuum when the throttle plate is opened by the gas pedal-like off idle). The valve is mounted in the intake manifold, and the exhaust gas reaches the valve from a pipe from the exhaust manifold. There just is no oil around the egr valve.

Posted on Jul 16, 2013

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SOURCE: 91 S10 2.5L 4cyl 5speed manual idles rough and

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Posted on Mar 27, 2010

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SOURCE: Code P401 on mercury Grand Marque. EGR valve

COULD BE THE EGR VALVE PORT HOLE IN THE INTAKE MANIFOLD IT COULD HAVE CARBON BUILT UP BLOCKING THE HOLE CLEAN IT A SMALL WIRE OR SCREW DRIVER.

Posted on May 05, 2010

daves944
  • 1050 Answers

SOURCE: I have a 97 camry and it 's code is showing EGR

If you are sure the valve is working and the passage is clear....it should stall the engine when you put vacuum to it while idling, then you may have a bad MAP sensor. There was a problem with them on this year. Sorry, I don't have the specs for the modulator with me, I'll try and dig up some info later today. The reason I said MAP sensor; the computer uses the signal from the MAP when it runs the diagnostic to check EGR operation. I'll add to this solution later today, in the meantime, does applying vacuum to the EGR stall the engine? If not, you'll need to remove it and clean out the intake manifold.

Posted on Jul 25, 2010

Testimonial: "Very helpfull , thank you ,yes the engine dies when vac is applyed to egr. Wish i knew a way to test MAP sensor? I knew that they were tied together ,"

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93 k1500 5.0, had a buddy fix an oil leak. stopped the leak. he changed the oil, but he used 15w-40 instead of 5w-30. only ran it for 50 miles. talked to dealer, they told me dump oil, change oil...


Well maintained a fleet of trucks and ran 20-40W all year long.Years ranging from 88-06 and never has a problem.Sounds like you may have a bad vacume line. Could be a problem with your EGR valve or the IAC (idle Air Control) Valve if equipted.Would start checking the vacume hoses first.Well hope this helps and good luck.

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  1. po401 refers to an insuffient flow of EGR gasses
  2. locate egr valve
  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
  8. if not remove valve
  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
  12. if ok reassemble.
  13. locate DPFE sensor
  14. inspect sensor for damage
  15. inspect hose to sensor for damage
  16. replace sensor
  17. 9ecffd7.gif

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1 Answer

2003 4.0 V6 explorer with the vacume line off the egr it runs, but runs rough. when the vacume line is hooked up to the egr it cuts off. i put a new egr on and it did the same thing please asap..


First. Check the vacum routing from the egr. facing the engine, the vac.
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bad connections have been found. This can narrow the field greatly.
You can stop by an autozone/napa etc. they will scan it for free.
I hope this helps. Good luck.

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