Running an Explorer
Well-Known Member
- Joined
- February 8, 2021
- Messages
- 101
- Reaction score
- 80
- City, State
- Laurel Bloomery, Tennessee
- Year, Model & Trim Level
- 1994 Ford Explorer Eddie
I bought my 1994 explorer (eddie bauer, 4.0, a4ld) 1 year and 1 month ago. When I bought it the check engine light was on, but it ran perfect. I did eventually do the paper clip method on it and pulled various codes related to the EGR, but as I said earlier, it ran great so I didn't bother with it.
About 2 months after buying it, it start having a slight surge when driving, not idling. So, I did the first and easiest thing, I changed the fuel filter. That, I thought helped for about 2 weeks, then it started surging again. So, I changed the fuel filter again and seemed to help, but several months later it started surging again, so I changed the fuel filter again, but this time it didn't help. So, I did some research on here and found out it could possibly be the IAC. I bought a new IAC and installed it and it seemed to fix it but it eventually started surging again. (While all this is going on, the surging has became worse, and now does it while idling.) My first thought was that my new IAC is faulty, so I took the IAC off my other 94 ex that runs perfect and put that IAC on and it did not help. I tried also putting on the throttle position sensor from my other ex and that did not help either. So, I went back to square one and read my check engine light codes and they were still all about the EGR. So, I did ALOT of searching on here regarding my specific codes and I came to the conclusion that it could be my DPFE sensor. So, I took the DPFE sensor off my other 94 ex and it solved my check engine light, but it still surges. I've also cleaned the mass airflow sensor, but to no avail. I have also unplugged the vacuum to the EGR valve, it runs rougher with it unplugged and it still surges. Also, I have looked and sprayed for vacuum leaks and can't find anything.
The surging has really no rhyme or reason. It surges when idling and driving. It doesn't matter if the engine is cold or fully warmed up. During all this time I've figured out if I leave the IAC unplugged it never surges. I would be fine with just leaving the IAC unplugged but it makes it idle pretty low on cold start and I have a frequent cold start miss (not every time, but most of the time). With the IAC unplugged and it missing on a cold start, it has stalled out before and I don't want this happening when I'm warming it up in the morning in the winter.
Any help will be greatly appreciated. I hope this makes sense, feel free to ask any questions.
About 2 months after buying it, it start having a slight surge when driving, not idling. So, I did the first and easiest thing, I changed the fuel filter. That, I thought helped for about 2 weeks, then it started surging again. So, I changed the fuel filter again and seemed to help, but several months later it started surging again, so I changed the fuel filter again, but this time it didn't help. So, I did some research on here and found out it could possibly be the IAC. I bought a new IAC and installed it and it seemed to fix it but it eventually started surging again. (While all this is going on, the surging has became worse, and now does it while idling.) My first thought was that my new IAC is faulty, so I took the IAC off my other 94 ex that runs perfect and put that IAC on and it did not help. I tried also putting on the throttle position sensor from my other ex and that did not help either. So, I went back to square one and read my check engine light codes and they were still all about the EGR. So, I did ALOT of searching on here regarding my specific codes and I came to the conclusion that it could be my DPFE sensor. So, I took the DPFE sensor off my other 94 ex and it solved my check engine light, but it still surges. I've also cleaned the mass airflow sensor, but to no avail. I have also unplugged the vacuum to the EGR valve, it runs rougher with it unplugged and it still surges. Also, I have looked and sprayed for vacuum leaks and can't find anything.
The surging has really no rhyme or reason. It surges when idling and driving. It doesn't matter if the engine is cold or fully warmed up. During all this time I've figured out if I leave the IAC unplugged it never surges. I would be fine with just leaving the IAC unplugged but it makes it idle pretty low on cold start and I have a frequent cold start miss (not every time, but most of the time). With the IAC unplugged and it missing on a cold start, it has stalled out before and I don't want this happening when I'm warming it up in the morning in the winter.
Any help will be greatly appreciated. I hope this makes sense, feel free to ask any questions.
