Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have on 04 chevy trailblazer. We have changed all coil…

Customer Question
I have on 04 chevy...
I have on 04 chevy trailblazer. We have changed all coil packs and spark plugs and the code p0300 still comes on... it idles a little off and only has rough take off. When you first take off the rpm goes between 4 and 5 then after that it runs smoothly so we have no idea what else it could be. We have changed sensors and fuel pump
Submitted: 8 months ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 7 minutes by:
11/21/2017
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,808
Experience: owner/mechanic at 3D Automotive
Verified

Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

do you have a scan tool that can read live data?

Ask Your Own Chevy Question
Customer reply replied 8 months ago
No all we have is the code reader
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

p0300 can be caused by all kind of things. Im not into throwing parts at cars until something fixes it. do you have spark on all cylinders? do you have injector pulse on all cylinders? what is the fuel pressure? does the coolant temp gauge read normal at mid gauge?

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

are you there?

Ask Your Own Chevy Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a chevy mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15,659
15,659 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 years experience.

GM Tech (Cam) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,659 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,621 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,884 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,948 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,822 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
I have a misfire on cylider 4 with a rough idle. However,
I have a misfire on cylider 4 with a rough idle. However, shortly after the cruise control randomly stopped working but some times does work and the back speakers do the same. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,621 satisfied customers
My 02 trailblazer is misfiring. After getting a P0303 code
My 02 trailblazer is misfiring. After getting a P0303 code on my obd scanner, I changed the spark plug. I was still getting the same misfire and code so I replaced the ignition coil pack. The truck is… read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
2004 4.2L DTC P0300. Just replaced fuel filter and cleaned
2004 4.2L DTC P0300. Just replaced fuel filter and cleaned throttle body … read more
C. Walker, Jr.
C. Walker, Jr.
633 satisfied customers
I'm ***** ***** and I have a 2000 buick regal that gave me a
I'm ***** ***** and I have a 2000 buick regal that gave me a code of p0300. I changed the spark plugs and wires and then noticed that the coil pack for cylinders 1 and 4 weren't firing. I purchased a … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,621 satisfied customers
I had a p302 code on 2003 Trailblazer. The truck was running
Customer: I had a p302 code on 2003 Trailblazer. The truck was running rough. My wife picked up a new coil pack at auto parts store and brought it home. I replaced the coil pack on cylinder 3 but my w… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Chevrolet Trailblazer: Good Afternoon, I have a 2005 Chevy
Good Afternoon, I have a 2005 Chevy Trailblazer with the "rough idle" problem. It is only felt at idle and occurs in park, neutral, with air on or off. I have engine code p0305 and p0128. I have read … read more
roy
roy
Associate Degree
3 satisfied customers
Chevrolet Trailblazer: Hello, I have a 2002 trailblazer and
Hello, I have a 2002 trailblazer and it started skipping and getting a service engine light and skipping so I checked it and got a cylinder 2 misfire code. So I changed all the spark plugs and the coi… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,659 satisfied customers
i have a 2004 trailblazer that started hesitating under acceleration
i have a 2004 trailblazer that started hesitating under acceleration and running a little rough at idle and gave a P0304 code. Changed all plugs and #4 coil pack. Still running the same and check engi… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,621 satisfied customers
Have a 2006 Chevy Trailblazer 4.2L. Started getting a lean mixture Bank #1 (P0171) about
Have a 2006 Chevy Trailblazer 4.2L. Started getting a lean mixture Bank #1 (P0171) about six months ago and was running a little rought at idle. Put in new spark plugs (65,000 miles) and cleaned thott… read more
rodcuda
rodcuda
Auto repair pro, 30 years experience
Associate Degree
74 satisfied customers
DROVE CAR HOME RAN BAD ,HADE 6 CODES P0101,P0171..P0174
AMEDDE FINNALY GOT CAR SMOGGED ,DROVE CAR HOME RAN BAD ,HADE 6 CODES P0101,P0171,P0172, P0174, P0175, P0300.CLEARED CODES .DROVE TO WORK 5 DAYS LATER 50 DEGREES TEMP ,RAN PERFECT NO CODES . DROVE AFTE… read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
19,176 satisfied customers
chevy tracker: my 2003..liter..rough idle..changed coil packs no help.
my 2003 2 liter chevy tracker has rough idle, service engine soon light is on all the time. had it checked, #4 cylinder misfire. changed coil packs no help. changed injector and got no help. rough idl… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
trailblazer: idling..firing..new plugs and up stream o2 sensor..hose
hi i have a 02 trailblazer running rough while idling and driviving until you get to 45 - 50 mph . put in new ign switch , cam position sensor , a had chevy mechanic scan said #4 mis firing bought new… read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
19,176 satisfied customers
2000 Chevy Malibu LS: idles rough..o2 sensors..rev..pumping it
My 2000 Chevy Malibu LS idles rough, more so while in drive stopped at a stoplight or something. Jus had the o2 sensors changed, which is what the diagnostic test said, but still doin it. If in park a… read more
cartech
cartech
master tech
High School or GED
3,324 satisfied customers
2005 CHEVY TRAILBLAZER: running rough even in park and at idle...p0302
I have a 2005 CHEVY TRAILBLAZER with 86,000. It is running rough even in park and at idle. I am getting A P0300 & P0302 code. What should I check first?… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,659 satisfied customers
2004 cavalier: im getting code..changed plugs..pipe..convertor
I have a 2004 cavalier, i'm getting code P0300 I have changed plugs and checked air way, pipe turns cherry red right before cat convertor.… read more
Jan Andersson
Jan Andersson
Master Tech
Bachelor's Degree
3 satisfied customers
2005 trailblazer: blew..fuel rail..back together..misfiring and smelt
my 2005 trailblazer just blew an engine at 60000miles. I took an engine out of a 04 trailblazer, switched the fuel rail and got it all back together. when i started it it was misfiring and smelt like … read more
Tim
Tim
High School or GED
62 satisfied customers
I have a 2003 chevy trailblazer EXT about a week ago i started
I have a 2003 chevy trailblazer EXT about a week ago i started having a vibration from the engine while idling at a stop light. I had the O2 sensor replaced as it gave a code twice when the service en… read more
Mcgruder73
Mcgruder73
Auto Technician
Associate Degree
chevy cavalier: cylinder..firing..spark plug..coil pack unit and you ?
I have a chevy cavalier 2003 2.2L ecotec, cylinder #2 and #3 seems to not firing, spark plug wet and smell gas, engine run rough, run very good last day but run bad this morning (exterior temperature … read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x