Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 2007 suburban ltz flex fuel. I'm getting a

Customer Question
p0300 random misfire...
I have a 2007 suburban ltz flex fuel. I'm getting a p0300 random misfire
Submitted: 2 years ago.Category: Chevy
Ask Your Own Chevy Question
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 43 minutes by:
1/27/2016
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago
cloe0626
cloe0626, Auto Mechanic
Category: Chevy
Satisfied Customers: 824
Experience: was a mechanic in the army for four years and have been working at a dealer ship the past five years
Verified

hello my name is ***** ***** is the phone call request that you as ask for as soon as you accept i will give you a call

Ask Your Own Chevy Question
Customer reply replied 2 years ago
Oh I didn't need a call I must have hit that on accident
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

not a problem no you still need help

Ask Your Own Chevy Question
Customer reply replied 2 years ago
Whatever the problem is I'm sure it's happening in cylinder 1 the most and cylinder 8 it's definitely not the wires or coil packs or spark plugs. Also I have a snap on modis scan tool to help I'm not that good with it yet if you want me to send you any data
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

yes can you send what information you are getting

Ask Your Own Chevy Question
Customer reply replied 2 years ago
Can you tell me what you want? The only code is the random misfire but when I go to misfire data it shows cylinder 1 misfiring like 60 times a cycle and cylinder 8 about 30
Customer reply replied 2 years ago
Just now cylinder 1 misfired 193 times and cylinder 8 had 1
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

can you check compression on cylinder 1

Ask Your Own Chevy Question
Customer reply replied 2 years ago
it was sorta tricky hard to count how many times it cranks. But I think it has good compression out of about 5 try's it was always between 100 and 180
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

compression shouldnt drop below 140

Ask Your Own Chevy Question
Customer reply replied 2 years ago
I also loosened the rockers on cylinder 1 and put 90 psi to it and couldn't hear air coming out any where
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

then i would agree you have good compression

Ask Your Own Chevy Question
Customer reply replied 2 years ago
How many revolutions should give you 140?
Customer reply replied 2 years ago
What would make 1 cylinder misfire like that?
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

run a fuel pressure to test you have already checked the spark plugs correct

Ask Your Own Chevy Question
Customer reply replied 2 years ago
Fuel pressure was 60 psi and I put a new spark plug in
Chevy Mechanic: Pete, Auto Service Technician replied 2 years ago
Pete
Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 32,629
Experience: 14 years GM dealer Technician.
Verified

Your next step here as it looks like compression is good is to have cylinder 1 fuel injector tested.I have seen the injector fail to atomize properly to where it needs cleaned or replaced to correct this fault here.Instead of testing it you can try and swap it with another injector on the fuel injector rail and see if the misfire moves to the cylinder you swapped it with.If it does then this is the fuel injector that needs replaced.If you want the test procedure let me know but this will require a fuel pressure test gauge and a scan tool that can pulse the injector.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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 Pete Your Own Question
Pete
Pete
Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 32,629
32,629 Satisfied Customers
Experience: 14 years GM dealer Technician.

Pete 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
What is the OEM spark plug for my 99 chevy tahoe? do they
What is the OEM spark plug for my 99 chevy tahoe? do they sell it on rock auto? here is a picture of whats in there now (41-932)… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 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
2,822 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
9,621 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
9,621 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
9,621 satisfied customers
2006 Chevy cobalt 2.4 no injector pulse, no spark. Plugs are
2006 Chevy cobalt 2.4 no injector pulse, no spark. Plugs are dry. Engine was replaced. Cranks no start… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 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
2,813 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
I have a code of po300 common misfire spark plugs were
I have a code of po300 common misfire spark plugs were changed and the coil pack on plug 1 check engine light comes on for a few days then goes off for a few days trying to figure what's going on … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I change the spark plugs I change the wires I change all
I change the spark plugs I change the wires I change all three coils I changed the gas card and I still getting the same code po300 lot of people is telling me that he could be the ignition module at … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,503 satisfied customers
I already change the spark plugs and wires on a Malibu 2003
I already change the spark plugs and wires on a Malibu 2003 Chevy it won't start … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Won't start, get spark from the spark plugs, have put gas in
won't start, get spark from the spark plugs, have put gas in the intact still won't start. Starter is turning all the belts … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug is looks like it's wet with gasolineAlso engine code P0106… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Pulled spark plug out and fuel came out with the plug.
pulled spark plug out and fuel came out with the plug. … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Misfire code p0306 I️ changer distributor cap spark plug and
Misfire code p0306 I️ changer distributor cap spark plug and wires new fuel pump don't understand why code is appearing … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
92 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