Hello all, I am new to Toyotas and to this site. I have a 98 4Runner with a 3.4 V6 auto tranny. My 4Runner is the Limited Edition (Not sure that makes a difference)
I have read on here and other sites about the IAT sensor, in my Hanes manual it only shows these on the 4 cyl. I looked in the electrical schematic to try and find the wire colors. I see that the same color for the IAT on the 4 cyl has the same color and referece as on the 3.4 MAF sensor.
Is there no IAT on the 3.4? When I hook my scanner up (Actron 9180) the IAT temp is about 10 degrees or better off, it shows 30-41 degrees when the temp is about 20 - 30 degrees F, is there a way to correct this?
Long way to explain I have a misfire on cyl 4, everything was fine then started when it got colder. Changed the plugs wires, O2 sensor, cleaned MAF sensor, still have a miss. MIL light comes on then will go back out on its own. There is no error code calling out the #4 injector, just the misfire code occasionally for cyl 4.
Any ideas anyone??

 

i would do a compression test


also i believe that the maf determines the intake temp on some vehicles, and being 10 degrees off is probably about right when you add the under hood temps to it

 

Thanks for the info
Compression test on all cyl or just the #4 cyl?