canthony15
Member
- Joined
- July 17, 2006
- Messages
- 13
- Reaction score
- 0
- City, State
- Westminster, CO
- Year, Model & Trim Level
- '00 AWD
Not Solved-Explorer stalls (hunts) when hot
I have been fighting this intermittent problem for a long time. I need help.
the vehicle is a 2000 Explorer 5.0 V8. I bought it with 30K on it back around 2003. Not long after we got it I was towing a trailer up the mountain and lost power. It seemed like it would slow down as I pressed down on the gas. We pulled over for a while and then it would go again for another 50 miles before stalling again. We made it to the camp site and didn't have the problem again. Next summer, in town on a 98 degree day, it happened again. let it cool down and it was OK again. I changed the fuel filter, having no clue what was going on. No codes by the way. Off and on though the years it has happened. Usually on a hot day after a long drive. The other day it happened on the way home from work. I work 25 miles away and it has been hot here. I happened to have my OBD scanner with me so I plugged in and looked at the live data. While it was trying to idle it would rev up and slow down, rev up and slow down. All I could see in the data that seemed wrong was that all of the short term fuel trims would jump up into the 40s and then go back down, up, down. At the same time the ignition advance would go up to around 20 degrees (my memory is a little fuzzy here) and then back down. All of the O2 sensors seemed to cycle with the revving. After I let it sit for an hour I drove home.
We are in for some serious hot days and I need to get this taken care of once and for all. Today I replaced the IAC. It seemed to be OK but after an hour of driving, the problem came back. It didn't seem to be as bad as it has been but it is still screwed up. I've cleaned the MAF sensor before but it is the original. The O2 sensors are original as is just about everything except one of the coil packs which I replaced a few months ago. I am thinking about a new MAF but I thought I would try asking here before I spend another 125 on a shot in the dark.
I should mention that I usually only have the problem when I slow down to an idle or near idle. When it is really bad, I can feel it cutting out while coasting down hill. It pretty much always happens for the first time when I am sitting at a light and I try to take off. Never when I am at cruising speed.
The first time it happened, I did replace the fuel filter (another wild ass guess).
The Explorer has 176K on it. Runs great as long as the temperature stays below 90 or so.
Looking for some ideas.
Tony
I have been fighting this intermittent problem for a long time. I need help.
the vehicle is a 2000 Explorer 5.0 V8. I bought it with 30K on it back around 2003. Not long after we got it I was towing a trailer up the mountain and lost power. It seemed like it would slow down as I pressed down on the gas. We pulled over for a while and then it would go again for another 50 miles before stalling again. We made it to the camp site and didn't have the problem again. Next summer, in town on a 98 degree day, it happened again. let it cool down and it was OK again. I changed the fuel filter, having no clue what was going on. No codes by the way. Off and on though the years it has happened. Usually on a hot day after a long drive. The other day it happened on the way home from work. I work 25 miles away and it has been hot here. I happened to have my OBD scanner with me so I plugged in and looked at the live data. While it was trying to idle it would rev up and slow down, rev up and slow down. All I could see in the data that seemed wrong was that all of the short term fuel trims would jump up into the 40s and then go back down, up, down. At the same time the ignition advance would go up to around 20 degrees (my memory is a little fuzzy here) and then back down. All of the O2 sensors seemed to cycle with the revving. After I let it sit for an hour I drove home.
We are in for some serious hot days and I need to get this taken care of once and for all. Today I replaced the IAC. It seemed to be OK but after an hour of driving, the problem came back. It didn't seem to be as bad as it has been but it is still screwed up. I've cleaned the MAF sensor before but it is the original. The O2 sensors are original as is just about everything except one of the coil packs which I replaced a few months ago. I am thinking about a new MAF but I thought I would try asking here before I spend another 125 on a shot in the dark.
I should mention that I usually only have the problem when I slow down to an idle or near idle. When it is really bad, I can feel it cutting out while coasting down hill. It pretty much always happens for the first time when I am sitting at a light and I try to take off. Never when I am at cruising speed.
The first time it happened, I did replace the fuel filter (another wild ass guess).
The Explorer has 176K on it. Runs great as long as the temperature stays below 90 or so.
Looking for some ideas.
Tony