Eight years ago this identical symptom was cured by eventually replacing:
EGR valve assembly (25620-66011)
Vacuum Switch Valve (90910-12079)
EGR Vacuum Modulator (25870-66011)
This was easily the most difficult maintenance issue to have diagnosed that I have ever experienced. Now that it has returned, I am questioning why three parts would fail simultaneously. If they were all $20 parts I would just have my current mechanic replace them and move on. He also feels that something just is not right.
This only occurs at highways speeds and seems be less frequent under 65 mph. Most of occurrences are extremely short duration, initially feeling like a hiccup or perhaps something was run over. Perhaps every fifth time it will seem as though the engine quits or as if your cruise control shut off. I don't recall seeing any dash lights come on. It might last for 5 seconds, but it seems a lot longer.
This recent occurrence began about ten miles down the highway and continued for about another ten miles. I turned back for home and only occurred once in twenty miles and I noticed that I had let it creep up towards 70mph. Cruise control was never on.
Another thing that makes me question this is that this has happened twice to me now, and I have not been able to find anyone having similar problems.
Any insight anyone might have will be greatly appreciated. Thank you in advance and have a good weekend.
EGR valve assembly (25620-66011)
Vacuum Switch Valve (90910-12079)
EGR Vacuum Modulator (25870-66011)
This was easily the most difficult maintenance issue to have diagnosed that I have ever experienced. Now that it has returned, I am questioning why three parts would fail simultaneously. If they were all $20 parts I would just have my current mechanic replace them and move on. He also feels that something just is not right.
This only occurs at highways speeds and seems be less frequent under 65 mph. Most of occurrences are extremely short duration, initially feeling like a hiccup or perhaps something was run over. Perhaps every fifth time it will seem as though the engine quits or as if your cruise control shut off. I don't recall seeing any dash lights come on. It might last for 5 seconds, but it seems a lot longer.
This recent occurrence began about ten miles down the highway and continued for about another ten miles. I turned back for home and only occurred once in twenty miles and I noticed that I had let it creep up towards 70mph. Cruise control was never on.
Another thing that makes me question this is that this has happened twice to me now, and I have not been able to find anyone having similar problems.
Any insight anyone might have will be greatly appreciated. Thank you in advance and have a good weekend.