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

19,835

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.
19,835

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.
19,835

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

1 of 1 people found this helpful.
19,835

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

1 of 1 people found this helpful.
19,835

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

2 of 2 people found this helpful.
19,835

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.

Your Answer

Silverado 2500

Looking for a Used Silverado 2500 in your area?

CarGurus has 225 nationwide Silverado 2500 listings starting at $2,888.

ZIP:

Chevrolet Silverado 2500 Experts

  • #1
    juniosex
    Reputation
    520
  • #2
    tankwalk
    Reputation
    450
  • #3
    km2002
    Reputation
    360
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD
331 Great Deals out of 30,019 listings starting at $3,500
Used Chevrolet Silverado 1500
2,261 Great Deals out of 168,225 listings starting at $1,000
Used Dodge Ram 2500
173 Great Deals out of 5,017 listings starting at $2,200
Used GMC Sierra 2500
4 Great Deals out of 155 listings starting at $2,995
Used Ford F-250 Super Duty
310 Great Deals out of 45,312 listings starting at $1,700
Used GMC Sierra 2500HD
98 Great Deals out of 13,844 listings starting at $2,999
Used Ford F-250
472 listings starting at $2,550
Used Ford F-150
2,565 Great Deals out of 195,337 listings starting at $1,300
Used Chevrolet Silverado 1500HD
6 Great Deals out of 264 listings starting at $2,195
Used GMC Sierra 1500
997 Great Deals out of 66,241 listings starting at $2,495
Used Chevrolet Silverado 3500
16 Great Deals out of 516 listings starting at $6,995
Used Dodge Ram 1500
358 Great Deals out of 10,824 listings starting at $1,500
Used Toyota Tundra
462 Great Deals out of 33,419 listings starting at $2,000

Used Cars For Sale

2004 Chevrolet Silverado 2500 For Sale
7 Great Deals out of 94 listings starting at $4,900
2003 Chevrolet Silverado 2500 For Sale
17 listings starting at $4,489
2002 Chevrolet Silverado 2500 For Sale
11 listings starting at $7,995
2001 Chevrolet Silverado 2500 For Sale
16 listings starting at $2,888
2000 Chevrolet Silverado 2500 For Sale
66 listings starting at $4,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.