Engine light flashing

20

Asked by Sep 21, 2016 at 08:59 PM about the 2000 Chevrolet Silverado 2500

Question type: Maintenance & Repair

00 silverado engine light flashing.  Read codes
came up with 02 sensors . Before getting them
replaced the truck lost most power . Rough idling
and seemed to have a lot of back pressure like the
exhaust was being driven through water . Obvious
to me the cats must be clogged right ? So I
proceeded to cut both cats out and had straight
pipes installed . After doing so the problem went
away for approximately 2 hours and now engine
light flashing again however the truck has gained
all its power back and rough idling has gone away .
I'm confused please help !!

8 Answers

17,745

O2 may still be getting readings out of limits, This could be related to the same reason cats clogged with is running rich. I would b4 replacing o2's check the normal items like plugs & wires, Air filter, clean MAF with CRC MAF cleaner & throttle body and IACV, TPS with CRC Throttle body cleaner and will need new gaskets on the IACV & Throttle Body, Make sure there is not any arcing with plugs & wires Can us Dielectric grease between boot & plug and same on boot to coils. Be sure not to touch the MAF filaments wire they are easy to damage just spray them off. i would also see if those codes are set and can erase them.

1 of 1 people found this helpful.
17,745

Here below is a test for down stream o2 sensor testing which is the 2 past the cats.

1 of 1 people found this helpful.
17,745

http://troubleshootmyvehicle.com/gm/4.8L-5.3L-6.0/diagnosing-codes-P0141-P0161-page-1

1 of 1 people found this helpful.
17,745

Here is the upstream test page below, copy &past see if these test match for you truck.

1 of 1 people found this helpful.
17,745

http://troubleshootmyvehicle.com/gm/4.8L-5.3L-6.0L/P0135-P0155-diagnostic-tests-1

2 of 2 people found this helpful.
17,745

This site has many other test for most auto's so you can search it to find others too.

1 of 1 people found this helpful.
20

Thank you I will look into those sites

20

So figured out its not the coil or plug . We swapped cylinder one and 3 and got same result . Code still reads cylinder 1 misfire

1 of 1 people found this helpful.

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