mattadams
Moderator Emeritus
- Joined
- September 17, 1999
- Messages
- 8,161
- Reaction score
- 10
- City, State
- Longmont, CO
- Year, Model & Trim Level
- 2017 Explorer Sport
OK, hopefully someone can help me out here, I'm about out of ideas. I don't want to spend a ton of money but I'd like the vehicle to work right...
First off, vehicle as 135,000 miles on it. I bought it used from Michigan and I have no idea about the maintenance history of the vehicle.
noticed a slight engine stumble when I was test driving it, but figured maybe a bad IAC... not too big of a deal.
When I got home, did an oil change on it, checked out some of the many maintenance items such as air filter, cleanliness of MAS, brake pads, etc. Almost everything seemed really good. Mass Air sensor wires looked clean, but of course that doesn't mean much... Even pulled two of the spark plugs and checked them and they looked really good like they'd been recently replaced. They were motorcraft platinum plugs and the wires looked uber-fresh. Then a little later, while running at 102 degrees, check engine light came on. P1511 and P1512 as I recall... whatever it was it mentioned O2 sensors, so I replaced the two upstream o2 sensors. I also did the fuel filter (looked to be the original, black gas was coming out of the back of it) and put some marvel mystery oil in the gas tank. Also cleaned out the IAC as best I could with q-tip and electric parts cleaner and reinstalled it, and hooked everything up again. Does seem to run and idle a bit better now, but two symptoms continue...
1) When starting vehicle in the morning or anytime after letting it sit a while, it will start ok, then after a few seconds, it will chug, almost stall and applying gas pedal does nothing. After about 2-3 seconds, its back to normal like nothing happened.
2) After running a while, if I stop and put it in park it will surge 3-4 times... 500rpm to 1500rpm and back, 3-4 times, then it will idle like normal.
No codes are thrown out at this time...
Neither of these are critical, just annoying. Any ideas?
Got a can of sea foam and considering running it through, a little nervous about it though and not sure it will fix whatever is going on anyways, it seems like something computer-controlled causing the problem not carbon buildups...
First off, vehicle as 135,000 miles on it. I bought it used from Michigan and I have no idea about the maintenance history of the vehicle.
noticed a slight engine stumble when I was test driving it, but figured maybe a bad IAC... not too big of a deal.
When I got home, did an oil change on it, checked out some of the many maintenance items such as air filter, cleanliness of MAS, brake pads, etc. Almost everything seemed really good. Mass Air sensor wires looked clean, but of course that doesn't mean much... Even pulled two of the spark plugs and checked them and they looked really good like they'd been recently replaced. They were motorcraft platinum plugs and the wires looked uber-fresh. Then a little later, while running at 102 degrees, check engine light came on. P1511 and P1512 as I recall... whatever it was it mentioned O2 sensors, so I replaced the two upstream o2 sensors. I also did the fuel filter (looked to be the original, black gas was coming out of the back of it) and put some marvel mystery oil in the gas tank. Also cleaned out the IAC as best I could with q-tip and electric parts cleaner and reinstalled it, and hooked everything up again. Does seem to run and idle a bit better now, but two symptoms continue...
1) When starting vehicle in the morning or anytime after letting it sit a while, it will start ok, then after a few seconds, it will chug, almost stall and applying gas pedal does nothing. After about 2-3 seconds, its back to normal like nothing happened.
2) After running a while, if I stop and put it in park it will surge 3-4 times... 500rpm to 1500rpm and back, 3-4 times, then it will idle like normal.
No codes are thrown out at this time...
Neither of these are critical, just annoying. Any ideas?
Got a can of sea foam and considering running it through, a little nervous about it though and not sure it will fix whatever is going on anyways, it seems like something computer-controlled causing the problem not carbon buildups...
