11-19-2019, 09:33 AM
(This post was last modified: 11-19-2019, 09:39 AM by TomPrestin.)
(11-19-2019, 09:10 AM)fixkick Wrote: lets start over, who said the burned up 2 Catconverters now. by what measure, P0421 codes, or smog man or?
The P0400 means the EGR fails..... in some way , if the cat broke up in pieces and went byebye EGR then fails too. the cat must be there and must have normal back pressure or the EGR MODulatopr FAILs to work. (goes offline)
did you fail a smog test or something, please advice here.
thanks for posting !
first one was obvious. header turned dark from over-heat, lost all power slowly and dramatically, pulled the cat and it was melted to a rock. I'm getting same subtle indicators now again. mostly progressive vibration from the cat as it sounds audibly to be deteriorating. I'm in Minnesota so no smog test.
no P0421, only P0400 that is incessant. I clear the code, drive for a bit comes back, but no clear circumstance. Sometimes first drive, sometimes second. sometimes on first start up, sometimes at random while driving.
New EGR, tested ISC good. decent gas milage so not in limp, ego exhaust port should be open as the engine/header only has about 8000 miles on it after total rebuild.
only other bit of information I left out of original post is recently it has started to hiccup a bit. at cold idle worst, or low throttle, not with open throttle. not a full misfire, seemed almost like it had bad gasoline, but I'm on tank 3 from different locations and same issue.
fuel pressure is stable and good.