Greetings, my 2001 E250 with a 4.2
has been giving me issues with a possible diagnoses of clogged cat (s) so I took some temps after a 10 minute idle.
left (ds) front of cat 390f back-235f
right front 275 225
Anyone know if these temps may look like possible clogged cats?
these are the large cats not the little ones.
Thanks

 

There is an easier to do this, connect a vacuum gauge to the intake , run the engine at around 2000 RPM , if vacuum continues to drop , there is a breathing problem with one of the converters.

 

Thanks, I'll give that a try.