I didn't see this topic in the Equinox section in this forum although it is discussed in the GMInsiderNews website forum. When I ran across this site, I thought it might be a good topic to include.
After a weekend trip from Michigan to NYC anc back in my 2010 4 cyl Equinox, I noticed on my way to work Monday morning that it was running a little rough. At stop lights, the RPM fluctuated down then up, almost like it was missing, but not quite. It revved up too high. When stepping on the gas to go, there was a hesitation. When I dropped my wife off at work, I noticed a rough idle sound from the exhaust and a lot of rotten egg odor. None of this was normal for my vehicle.
When I arrived at work and shut off the engine, it dieseled for about one second. Really wierd. After work, it started fine and drove fine until I got off the xway after 10 minutes and everything started to happen again. Then the check engine light came on. I stopped at AutoZone for a free trouble code check and it came back P0172 - too rich.
Dieseled to a stop at home, then Googled the trouble code and found the GM Inside News thread about a similar issue.
To shorten the story, I made some inquires to friends at GM and found that it is a problem with the high pressure fuel pump. A seal inside the pump can fail, allowing fuel to get into the oil. There was so much fuel mixed in with the oil, that when I shut off the car, oil in the cylinders ignited and caused the dieseling. It caused my oil to turn BLACK. You may be able to smell fuel in the oil.
The problem has happened before and GM is aware of it. Failure usually occurs on vehicles with under 6k miles. My vehicle just turned over 50k. The GM guy said they are very interested since they have not had a seal fail at high mileage. Probably because nobody else has 50k on their vehicle!
I dropped the car off at the dealer for repair under the 100,000 mile Powertrain warranty. They had to order the pump, but I get a free loaner until the job is done. Oil change is included in the repair.
A bonus is that my vehicle is one built with the ticking pump. Although the ticking has mostly gone away, the new pump includes the fix - and hopefully a better seal. So it should be quieter.
I could be waiting up to two weeks for a replacement pump.
After a weekend trip from Michigan to NYC anc back in my 2010 4 cyl Equinox, I noticed on my way to work Monday morning that it was running a little rough. At stop lights, the RPM fluctuated down then up, almost like it was missing, but not quite. It revved up too high. When stepping on the gas to go, there was a hesitation. When I dropped my wife off at work, I noticed a rough idle sound from the exhaust and a lot of rotten egg odor. None of this was normal for my vehicle.
When I arrived at work and shut off the engine, it dieseled for about one second. Really wierd. After work, it started fine and drove fine until I got off the xway after 10 minutes and everything started to happen again. Then the check engine light came on. I stopped at AutoZone for a free trouble code check and it came back P0172 - too rich.
Dieseled to a stop at home, then Googled the trouble code and found the GM Inside News thread about a similar issue.
To shorten the story, I made some inquires to friends at GM and found that it is a problem with the high pressure fuel pump. A seal inside the pump can fail, allowing fuel to get into the oil. There was so much fuel mixed in with the oil, that when I shut off the car, oil in the cylinders ignited and caused the dieseling. It caused my oil to turn BLACK. You may be able to smell fuel in the oil.
The problem has happened before and GM is aware of it. Failure usually occurs on vehicles with under 6k miles. My vehicle just turned over 50k. The GM guy said they are very interested since they have not had a seal fail at high mileage. Probably because nobody else has 50k on their vehicle!
I dropped the car off at the dealer for repair under the 100,000 mile Powertrain warranty. They had to order the pump, but I get a free loaner until the job is done. Oil change is included in the repair.
A bonus is that my vehicle is one built with the ticking pump. Although the ticking has mostly gone away, the new pump includes the fix - and hopefully a better seal. So it should be quieter.
I could be waiting up to two weeks for a replacement pump.