Posted by Steve@Advance on May 16, 2020 at 07:01:43 from (66.169.147.211):
In Reply to: New truck issues posted by Grandpa love on May 16, 2020 at 04:32:53:
Typical symptoms of a clogged converter, or restricted exhaust for any reason, it will idle, but not rev or make power, sometimes accompanied by whistling at the tail pipe.
In extreme cases it may not even start.
But it is almost always a permanent condition, not intermittent, not temporarily corrected by a restart. Removing the upstream o2 sensors will give pack pressure relief for a test.
Do you remember what the code was? There is no sensor to detect back pressure. A PO420 code is derived from the readings of the oxygen sensors trying to determine the efficiency of the cats. Other factors can also set that code, so don't condemn the cats just yet.
Try cleaning the MAF sensor, clear the codes, see what codes set when it happens again. Being it was caused by a sudden jolt, look for chaffed/burned wiring, loose connections related to the code set. Might try reseating the connector plugs on the ECM.
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