Idle Problem 4.6

[Afeef Adnan]

2006 Explorer XLT 4.6
These are the codes I am getting

1. P0135
2. P0141
3. P0155
4. P0161
5. P0443
6. P2004
7. P2005
8. P0581
9. P0193 (Sometimes)

after the engine warms up the idle is around 1000 - 1200rpm and FRP is around 400 - 500kpa. The first five codes are because of the PCM. I want to know why the idle is so high only in Park and Neutral. It doesnt stall and engine is running fine.

 

[Nedwreck]

That EVAP code p0443 could be a good "tell" about the idle. Those o2 heater circuit faults could be a blown fuse. The p2204 and p2005 are probably from the same intake runner issue, not sure about troubleshooting the intake runner things. It seems like a good time to go through all the fuses etc, get the EVAP working right, and go from there. With so many things going on at once there's no telling what the ECU thinks it should do.

 

[Afeef Adnan]

That EVAP code p0443 could be a good "tell" about the idle. Those o2 heater circuit faults could be a blown fuse. The p2204 and p2005 are probably from the same intake runner issue, not sure about troubleshooting the intake runner things. It seems like a good time to go through all the fuses etc, get the EVAP working right, and go from there. With so many things going on at once there's no telling what the ECU thinks it should do.

fuses are good. Mechanic told the Ecu is bad thats why I am getting these 5 codes, I was wondering is there anything else wrong in the system like fuel pump because frp is high. Thank you for your help.

 

[Nedwreck]

fuses are good. Mechanic told the Ecu is bad thats why I am getting these 5 codes, I was wondering is there anything else wrong in the system like fuel pump because frp is high. Thank you for your help.

Not sure how helpful I was really lol. You'd probably want to account for overall truck condition, whether things have been kept up with vs mileage etc. If a previous owner just ignored the CEL then things could certainly stack up over time. If all these faults came up at about the same time yes I'd want to look for whatever is common to them all (like the ECU). It might be worth looking over grounds etc, if you have wiring diagrams to look at for factory wire splices (both grounds and power stuff) it is remotely possible one of those is damaged/corroded/whatever. I'd check the resistance of the O2 heaters, the ones easier to do at least, just to double check.

The "Similar Threads" section at the bottom of the site here turned this up:

2008 XLT - 200K miles - CEL : Multiple codes ALL O2 sensors throwing codes at same time ?

My check engine light came on other day and its showing ALL of these codes which looks like all of the O2 sensors and some other codes : this is really weird , does anyone know what it could be ? P0135 P0141 P0155 P0161 P0403 P0443

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