Mass Air Flow 2001 2.8 V6 Auto

[nkswinburne]

Hi my 2001 galaxy 2.8 v6 auto has developed a problem after it has warmed up on long journey, It feels under powered and epc light comes on and it enters limp home mode.The fault reads mass air flow implausible signal I have replaced the MAF but it has had no effect still getting the same problem if anything the new MAF made it worse. I also seem to have a misfire at around 1500 rpm and a delay when I press the throttle followed but a sucking noise like its gasping for breath Was hoping some one on here might be able to point me in the right direction as to what could be the cause of this as its driving me nuts.

 

Could the misfire be causing the implausible signal error?  

[Argrdnr]

There's loads of topics here about MAF and limp mode, I have the same issue. All I have done so far is change the MAF, put redex in and cleaned the air filter.

I'm going to be changing the oil and fuel filter soon.

Mine hasn't gone in limp for about 3 weeks now. Some people say it could be the EGR valve. (All we know is, his called the stig) sorry that had to be said hahaha.

[Argrdnr]

Check the pies for leaks as well

[nkswinburne]

It's going to be a long process I think all the wiring seems ok so time to start looking for leaks.

[Argrdnr]

I've been told that if the car has an EGR valve, get that off as it will be clogged up with carbon. I would but my hands are so big and access is very difficult, if it was near the front of the engine it would be ok, but oh no. It's at the back and you have to remove the bulk head where the window wiper motor is. That's fun in itself.

 

I've Ben trying to make the car go in limp mode to try and rule out anything but it isn't working. The only way I CAN do it is pulling away in 2nd or 3rd gear. Which to me seems like its fuel or air. Hence why I need to change the fuel filter but a bolt has seized and I need to find the best way to remove it.