Brandon96
Explorer Addict
- Joined
- September 6, 2008
- Messages
- 1,294
- Reaction score
- 6
- City, State
- Central Virginia
- Year, Model & Trim Level
- '96 XLT 4.0 OHV
This problem has been occurring over the past couple of days for me and I posted about it in my build thread - Here. However, since the truck is back to being my daily driver, I'm really nervous about harming any part of my brand new motor. So I post here, trying to draw a little more attention to the circumstance.
So here it goes; (keep in mind, I have the 422 cam, worked heads/lower intake etc etc..)
Truck was originally throwing a P0135 - (Heater Circuit Malfunction Bank 1 Sensor 1). It was clearly running rich and was not getting very impressive gas mileage, Also had a SLIGHT hesitation from a stand still start. I drove it on that code for about a week until I received 2 new upstream 02 Sensors from Tousley Ford. I did not replace the downstream/post cat sensor.
After installing the new sensors I did NOT reset the truck's computer. It ran completely fine for a day. The next day, on a cold start up it did NOT want to start. When it did finally crank up I blew a huge black plume out the tail pipes, reeked of fuel. It would bog down and cut off every time I tried to put it into drive, and would hesitate and misfire while I was trying to warm it up a bit. After getting the motor above ~115 degrees I'm able to get it into D and drive it. It hesitates and misfires completely randomly in the low RPM ranges, say below 2,000. The truck will randomly 'fix' itself or have an 'epiphany' as I like to call it, and run completely fine and achieve 22mpg+ when it does so.
The truck is currently randomly throwing a P0300 - (Random, multiple cylinder misfire), P1131 and P1132 - (02 Bank 1 Sensor 1 reading lean and rich). It is still hesitating, miss firing, underpowered, losing MPG's and tries its best to cut off on me on cold start up as well as warm start up, and always dies when I put it into drive on cold start up. Also, I am getting a terrible smell of fuel/rotten egg smell from the exhaust every now and then. I've read that when the truck goes from rich to lean quickly the cats will reek for a bit. No change in the pitch of the exhaust note, so I'm not sure that the cats are bad..
Basically, the entire engine is brand new. The IAC, PCV, IAT, and both water temp sensors/senders are brand new. Spark plugs and wires are brand new. Coil pack is 10 months old. Upstream 02 Sensors brand new. MAF is original but has been cleaned repeatedly. I tried unplugging the truck's battery to reset the computer, I may not have left it out long enough so it sits tonight unplugged for a positive reset.
I'm sure I'm leaving some other necessary information out, but if anyone has any ideas, or would like to walk me through the diagnostics, I'm all ears for this one. I could not find the information relevant to my case. Most of the others had code combinations with specific cylinders, downstream 02 sensors and fuel pressure issues.
- Brandon
So here it goes; (keep in mind, I have the 422 cam, worked heads/lower intake etc etc..)
Truck was originally throwing a P0135 - (Heater Circuit Malfunction Bank 1 Sensor 1). It was clearly running rich and was not getting very impressive gas mileage, Also had a SLIGHT hesitation from a stand still start. I drove it on that code for about a week until I received 2 new upstream 02 Sensors from Tousley Ford. I did not replace the downstream/post cat sensor.
After installing the new sensors I did NOT reset the truck's computer. It ran completely fine for a day. The next day, on a cold start up it did NOT want to start. When it did finally crank up I blew a huge black plume out the tail pipes, reeked of fuel. It would bog down and cut off every time I tried to put it into drive, and would hesitate and misfire while I was trying to warm it up a bit. After getting the motor above ~115 degrees I'm able to get it into D and drive it. It hesitates and misfires completely randomly in the low RPM ranges, say below 2,000. The truck will randomly 'fix' itself or have an 'epiphany' as I like to call it, and run completely fine and achieve 22mpg+ when it does so.
The truck is currently randomly throwing a P0300 - (Random, multiple cylinder misfire), P1131 and P1132 - (02 Bank 1 Sensor 1 reading lean and rich). It is still hesitating, miss firing, underpowered, losing MPG's and tries its best to cut off on me on cold start up as well as warm start up, and always dies when I put it into drive on cold start up. Also, I am getting a terrible smell of fuel/rotten egg smell from the exhaust every now and then. I've read that when the truck goes from rich to lean quickly the cats will reek for a bit. No change in the pitch of the exhaust note, so I'm not sure that the cats are bad..
Basically, the entire engine is brand new. The IAC, PCV, IAT, and both water temp sensors/senders are brand new. Spark plugs and wires are brand new. Coil pack is 10 months old. Upstream 02 Sensors brand new. MAF is original but has been cleaned repeatedly. I tried unplugging the truck's battery to reset the computer, I may not have left it out long enough so it sits tonight unplugged for a positive reset.
I'm sure I'm leaving some other necessary information out, but if anyone has any ideas, or would like to walk me through the diagnostics, I'm all ears for this one. I could not find the information relevant to my case. Most of the others had code combinations with specific cylinders, downstream 02 sensors and fuel pressure issues.
- Brandon
:... I know very little on the matter, but I do have a volt meter and would love to try it out if someone could tell me the specs and ranges of the 02 sensor.
