Question about 1999 Chevrolet C2500

1 Answer

PO300 code on 2004 Chevy 2500hd

I am having issues with the PO300 code showing up. The truck runs good and I only notice a slight miss at start up, other than this the truck runs fine. I have replaced the wires and plugs and the light still comes on. I can run around town for a while and I do not get the check engine light, it seems to come on while running the interstate at the higher rpm's.

Any help would be appreciated.

Frank K.

Posted by on

  • Jerry Koski
    Jerry Koski May 11, 2010

    Hey frank make sure the rubber from the air cleaner to the maf sensor is tight and good connections are made from air cleaner to throttle body .. also you might clean that maf sensor .. like a screen with a little chemtool and then retighten it .. just a thought let me know. jerry thanks

×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hi Frank, Give me a call, 866-718-1234 ext 158.

Posted on Jul 13, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 04 f-250 that has a intermitting miss after start up for about 2 mins i've changed plugs/boots and no help. I've had to dealer injectors all good coils all good ecm not setting any codes. any one...


The COP Ignition coils are not good

They may not show up on cylinder misfire
counts, at start up or on a road trip, but after
7 years they all fail & act up when they want
to

My advice--learn the technology & stay away from a
dealer,you sort of see why

Do not need codes to have vehicle problems

I have walked new coils on fords, because the professional
tools don't see all the coil issues, when they act up

On start up you should the PO300 & 316 codes on scan tool,
based on what your saying

Sep 07, 2014 | 2004 Ford F-250 Super Duty

1 Answer

I have had my 2003 chevy astro van at a local midas for weeks now with the following issue. when i am driving over 55mph and goto pass on a slight hill the check engine light starts flashing and will stay...


You never take your vehicle to places like midas , pep boy's , firestone etc.. Find yourself a local independent repair shop . Po300 is a random misfire , not cylinder specific ! Causes ,lean air fuel mixture , vacuum leaks , low fuel pressure , clogged fuel filter , a O2 sensor problem . You need to find someone like this guy !
003 Scan Data for Fuel Code

May 25, 2017 | Chevrolet Astro Cars & Trucks

1 Answer

I have a 99 malibu with a 3.1L engine. my check engine light came on and then started to blink, after scanning the car with a code reader it showed a PO300, PO113, and P1404. after reseaching the...


the flashing light is telling you the engine is miss firing, not that there is fuel in the exhust a miss fire is the only thing that will cause the light o flash the P0300 is a random misfire so i cant tell you witch cylinder but replace the coils that should take care of it....good luck

Jul 29, 2011 | 1999 Chevrolet Malibu

2 Answers

04' Ram 1500, bad mis-fire. cust repl s/plugs. no help. Codes for coils #7 & 8 w/mis-fire. replaced coils & wire set. Better, but still P0300. Compression good


You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.

Sep 18, 2010 | 2004 Dodge Ram 1500

1 Answer

2001 CHEVY SILVERADO 2500HD BATTERY LIGHT FLASHES INTERMITTENTLY. NO PROBLEM WITH BATTERY OR WITH ALTERNATOR, BOTH OF WHICH TEST OK. NO PROBLEM WITH STARTING OR RUNNING, EXCEPT FOR THE FLASHING BATTERY...


2001 chevy silverado 2500hd battery light flashes intermittently. no problem with battery or alterntor. both tested ok. no problems with starting or running. voltage gauge reads just above 14. no problems with anything except battery light flashes. what could be the problem?

Dec 04, 2009 | 2001 Chevrolet Silverado 2500HD

1 Answer

Vibration in the steering wheel on a 4wd truck


I just had the same issue with a 1999 2500HD and the vibration got worse above 50 mph. Problem was resolved with a new driveshaft. Old one (aluminum) was badly out of true and the problem didn't really occur until I had the U joints changed - then bent driveshaft vibration was noticeable. New driveshaft resolved issue.

Dec 03, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Dash lights do not work. 2004 Chevy 2500HD crewcab


air conditioner 2500 silverado in dash not working

Apr 10, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

Trouble codes


Hi Sandra!
The trouble codes listed are defined as:

P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

P0300 Random/Multiple Cylinder Misfire Detected

P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)

PO300 & PO331 are possibly symptomatic of issues caused by PO141, which would have a direct influence on the air/fuel mxture... which could cause missing and knocking.

So the first thing I would try is replacing the Bank 2 Oxygen Sensor, after making sure the wiring and connections to that sensor are in good shape.

Does the engine show any physical issues such as loosing coolant, smoking exhaust, overheating? A blown or leaking head gasket on the #2 bank could also present these (among other)
codes.

Good luck and let me know how it goes!

WB

Jun 09, 2008 | 1997 Pontiac Grand Am

Not finding what you are looking for?
1999 Chevrolet C2500 Logo

719 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6918 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...