Hi Guys,

Seeking the help of the Evo community here on this one, as I am completely stumped.

Ive recently had some AFR issues. Basically what happens is that the car will start out fine at its normal cruising / Booting AFR's, however 15-20mins into the journey, it will start going rich, around the 13-13.5 mark.

If you pull over, turn the car off, and turn it back on, the AFR corects itself back at 14.9, however drive another 15-20mins, same problem occurs until you switch off and restart again.

The car runs a stock ECU remapped on E85 using Tephra V7. Ive replaced the following items to try and see if it changes the problem, but have had little luck in resolving:

Fuel pump
Fuel pressure reg
Fuel pump housing (The white plastic thing)
Injectors
Fuel Rail

Hopefully someone can point me in the right direction as to what could be happening?

Thanks

Jason

 

Might be the temp sensor staying stuck at giving a cold engine temp reading. Log some runs and see what the sensor is saying. Had a similar problem with mine.

 

How did you end up resolving the problem? Assuming you replaced the sensor? Any ideas where I can locate the sensor?

 

yep..replaced the sensor....it's onder water neck at the thermostat housing...look for the larger sensor..that's it..

 

Thanks Heaps

 

Just to also clarify, when your temp sensor was getting stuck, was your car water temp reading on the dash affected?

 

No....that's another sensor, the smaller one next to the big sensor for the ecu....