Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

My 2003 GMC Yukon has code p0300, so far i have changed

Customer Question
My 2003 GMC Yukon...

My 2003 GMC Yukon has code p0300, so far i have changed spark plugs and wires,

Mechanic's Assistant: How many miles are on the car? When did you last change the plugs?

140,000 miles, plugs were changed at 138k

Mechanic's Assistant: Are you fixing your Yukon yourself? What have you tried so far?

I have changed plugs and wires so far, feels like a miss at idle

Submitted: 3 months ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 4 minutes by:
3/12/2018
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,583
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 3 months ago

start disconnecting a coil pack at a time until you notice disconnecting one, doesn't have an effect on the engine running.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
ok, i will get back to you
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

ok

Ask Your Own Chevy Question
Customer reply replied 3 months ago
pass. rear cyl makes no diffrence when plug wire is disconected, however I did notice A strong consistant spark from plug wire to exhaust manifold when disconnected from plug but think that would be normal.
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

let me decipher that

Ask Your Own Chevy Question
Customer reply replied 3 months ago
what a putts
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

oh crap, I forgot about you.

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

I apologize

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

and that would be Putz

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

any headway?

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: 15,529
15,529 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

15,529 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,602 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

2,943 satisfied customers

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

Ron Z.

Ron Z.

- Chevy Tech -

2,807 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
My truck cranks but wont start until i..throttle body..spark plugs
ok.... my truck cranks but wont start until i pour fuel down the throttle body, then it starts right up... it has a new fuel pump spark plugs cap and rotor... im lost idk what else to try.... its a 98… read more
Online Wrench
Online Wrench
Associate Degree
218 satisfied customers
1997 Suburban: 5.7L, AT..backfire..Scan tool shows no dtcs.
1997 Suburban, 5.7L, AT, K2500 suddenly goes "No Start". Engine cranks good but all we get is an occasional backfire. Scan tool shows no DTC's. Fuel pressure 62 psi. Inline spark tester shows good spa… read more
Mcgruder73
Mcgruder73
Auto Technician
Associate Degree
2009 Chevy silverado LT 5.3 truck has extended crank before
2009 Chevy silverado LT 5.3 truck has extended crank before starting at random times. some times remote start will not work… read more
Dave Nova
Dave Nova
Chevrolet Technician
Associate Degree
7,092 satisfied customers
ENGINE SPINS, WON'T START. SPARK PLUGS ARE FIRING ,POURED
ENGINE SPINS , WON'T START. SPARK PLUGS ARE FIRING ,POURED GAS INTO CARB STILL NO LUCK. CHANGED CRANK SENSOR STILL NO START, JUST SPINNING … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Not sure of spark plug cable order. 2003 Suburban. All spark
Yes..all spark plugs are in...but i notice different #s on all cables … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,807 satisfied customers
The insulator is broke on my spark plug again only after
The insulator is broke on my spark plug again only after 15,000 miles and I'm getting a misfire on that cylinder number seven. It's a 2007 Chevy suburban 5.3 with 186,000 miles. What are the possible … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,602 satisfied customers
I just changed my spark plugs and both of my oxygen sensors.
I just changed my spark plugs and both of my oxygen sensors. What does it mean to have lean deposits on the spark plugs and upstream oxygen sensor and rich deposits on the downstream oxygen sensor? … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,602 satisfied customers
A friend changed my spark plugs and wires but got the wires
a friend changed my spark plugs and wires but got the wires mixed up. Is there a simple diagram I can download to hook them up correctly. I think the firing order is 1-8-4-3-6-5-7-2, but I don't know … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
My 89 camaro lost spark after I changed the spark plugs and
My 89 camaro lost spark after I changed the spark plugs and distributor cap what could be the problem?… read more
Danny
Danny
Owner, lead mechanic
High School or GED
3,963 satisfied customers
Purchased new spark plug wires for 84 caprice not sure if
Purchased new spark plug wires for 84 caprice not sure if they are wired right I know thw the diagram for the engine it's just the right wires go where … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,602 satisfied customers
Wanting to know how many spark plugs for my 1999 blazer. i
wanting to know how many spark plugs for my 1999 blazer. i would like to replace them. … read more
Mechanic01
Mechanic01
2,753 satisfied customers
After I change spark plugs on a 2005 Colorado my warning
After I change spark plugs on a 2005 Colorado my warning light came on. Took to Chevy mech and they stated that I needed a valve job.. Only misses when at a stop or traffic light and not all of the ti… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
P300: codes..p0101..new plugs and wires in and didnt fix problem
Getting 2 codes p0300 & p0101. I think 1 is triggering the other. I just put new plugs and wires in and didn''t fix problem. Seems to trip code at higher RPS''s like when passing or when it downshifts… read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
my 85 chevy truck will not start. The relay for the starter
my 85 chevy truck will not start. The relay for the starter does not even click. the accessories do not work as well. however the headlights still work and so does the snowplow. Seconds before all of … read more
Bob
Bob
Vocational, Technical or Trade Scho
2,784 satisfied customers
New rebuilt Chevy 350 turns over but it will not start. New ...
New rebuilt Chevy 350 turns over but it will not start. New Eldebroke Carburator in place carb is spitting out. I have turned the carb 180 still no fire. I have checked for spark and there is spark. I… read more
j_ramsey
j_ramsey
High School or GED
480 satisfied customers
2005 Chevy: the car stalls/dies while Im driving..restarted..park
I bought a used 2005 Chevy Maxx V6 engine w/92k miles. I've driven less than 450 miles (over a 6 week period) and on 4 separate occasions (the problem is now happening w/more frequency) the car stalls… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Pickup: coil..a Chevrolet 1500, with 5.7L V8..shaft
Trying to change the pickup coil on a Chevrolet 1500, with 5.7L V8 TBI. How do I remove the reluctor? It appears to have a bit of rust around the shaft, and at this point will not pry off. Does it pry… read more
Joecamel90
Joecamel90
Technician
Associate Degree
24 satisfied customers
How do you check for a collapsed lifter on a big block chevy
how do you check for a collapsed lifter on a big block chevy… read more
Ted G.
Ted G.
Technical/Sales Trainer
Vocational, Technical or Trade Scho
4,376 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