cartmill

iTrader: (3)

hey guys,

i have had a CEL, so i pulled the codes yesterday. i got air temp sensor, airflow meter, and main o2 sensor. i also had a random misfire from thje #5 cylinder due to a bad/arcing plug wire.

so i replaced the plug wires and it is smoother, but still lightly jerks while cruising on the highway with any load (like going up a hill or something). if i unplug the AFM, it has no effect on the way the car runs.

while on my maiden voyage tonight after replacing the plug wires, i noticed that there is a definite rev limiter at around 4200 rpms under all conditions (neutral, park, drive, etc.) could this be caused by the AFM ecu code? also, are there any other conditions that can trigger the bad AFM code?

i am really hoping i don't have to buy a new AFM... but from what i've been reading on here, it's a common problem with these cars, which is unfortunate.

StiCk3

iTrader: (5)

if you unplugged the MAF and the car still runs crappy, then you just answered your own question. What are the exact code numbers that your ecu is showing?

as for the 4200 RPM condition, it probably is the trouble code and the ECU reverts to a "safe mode" so it can operate until repaired.

cartmill

iTrader: (3)

15, 32, and 20 something.

i just remember specifically it was the intake air temp sensor, AFM, and o2 sensor.

cartmill

iTrader: (3)

does anyone know of a list that shows which CEL codes will put the ECU into limp mode?

StiCk3

iTrader: (5)

15 is an ignition coil malfunction. you said before that as you're driving the car is jerking under load. Are you sure the car isn't misfiring?

cartmill

iTrader: (3)

ok i must have posted the wrong CEL code numbers.

i remember specifically it was intake air temp, AFM, and o2 sensor.


is there a way to find out exactly which o2 sensor is out? i'd hate to hate to replace all of them.

cartmill

iTrader: (3)

i've now got all CEL codes gone, and there is still a rev limiter at 4200rpms....

wtf?

ihiryu

iTrader: (7)

hmm maybe a knock sensor? It's possible one of them is bad.

cartmill

iTrader: (3)

apparently i have a gauge cluster out of an sc300 (6cyl) so it's getting 2/3rds the signal it needs for the v8. hence why it's reading 2/3rds low.


thanks for all the amazing help, guys...