Arthur, thanks.
Now I have a really boneheaded question, but bear with me since I am new to this procedure:
I have surmised that the EGR is the object resembling a flying saucer from a 1950's SciFi movie. To do the vacuum test, I assume I must disconnect the short orangish/pinkish (vacuum??) line connecting it to the engine, and attach the hand pump line in its place, correct?
Quote:
Originally Posted by Arthur Dalton
The basic concept of the test is the EGR is never called for at idle when car coolant is up to temp.
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Just out of curiosity, would this coolant temp dependency affect how quickly the CEL returns after its code is cleared?
After clearing the codes on Sunday afternoon, the CEL returned Monday morning after only the 4th drive/restart sequence of the day. At that time, I was finally was able to retrieve the "5" code, and cleared it again. This time, the CEL did not return until Tuesday morning, after the 8th or 9th drive/restart.
On Sunday, I was driving during warm daytime hours during which time coolant temp was at or above normal. On Monday, however, the day itself was cooler, and most of my driving was at night, when coolant temp was at or below normal. Only after a "hot" highway drive did the CEL illuminate on a subsequent start.