Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

2001 Suburban: V8 2wd When starting..Runs rough..car runs fine

Customer Question
2001 Suburban, V8 2wd...
2001 Suburban, V8 2wd When starting up cold (outside temp around 40F), car runs rich, smelling at tailpipe. Runs rough during first 5 minutes. After that, car runs fine all day. Check Engine light on, misfire P300 code. After car is driven for a couple hours checked faults when car came home - P171, too lean bank 1, and P174 too lean bank 2. I have replaced maf sensor and coolant temp sensor, not sure where to go from here. I have looked online about tech bulletin 3232, having to do with misfires cold and possible po171, and po174.

What do you think would be the repair now, I'm thinking I might need to replace intake manifold gaskets. I've heard these can be a problem on this model.
Thanks,
Allan
Submitted: 8 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 10 minutes by:
10/26/2009
Chevy Mechanic: Dan, ASE Certified Technician replied 8 years ago
Dan
Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2,270
Experience: 20 Year Factory Trained Current GM Technician
Verified
Hey Allan,
Is this a 5.3L engine?

Yes, The intake gaskets are a problem on these engines for them leaking especially when cold. To test you need a scan tool that can display fuel trim data and watch the short term trim #'s and spray carburetor spray around the intake gaskets and see if the trim #'s go into the negative.
also check the air duct from the mass air flow sensor to the throttle body. Make sure all is tight and no leaks.
Checking fuel pressure would be another test to do. IF fuel pressure is low, it can cause this problem also.
Dan
Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2,270
Experience: 20 Year Factory Trained Current GM Technician
Verified
Dan and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago

Thanks. I understand what you are saying. My scan tool only has freeze frame, does not display live data. How else can I check this? By spraying around intake with carbuerator spray, and see if idle smooths out or changes? If fuel pressure is low, is that the pump or pressure regulator? (Yes it is a 5.3L)

 

Thanks again for the quick response, I'll try these things in the next couple days.

 

Allan

Chevy Mechanic: Dan, ASE Certified Technician replied 8 years ago
If the intake is leaking bad enough, it will change rpm by spraying carb cleaner on it. you can try itand see what happens.
If fuel pressure is low, fuel pump most common problem. Check fuel filter though, make sure its not clogged.

Let me know what these come out to be.
Ask Your Own Chevy Question
Customer reply replied 8 years ago

thank you so much

Allan

Customer reply replied 8 years ago
Dan,
Just wanted to let you know the car is repaired. I replaced the fuel filter, found partially clogged. Lifted foam pad out of way under intake and sprayed carb cleaner. Had a scan tool with live data and watched short term fuel trim. It changed immediately. Replaced intake gaskets following this test...2 hours later the car was repaired and started with a perfect idle when cold. During my travels in my business (car wash repair at dealerships), I found at a Chevy dealer after talking to forman,there is a TSB for this exact problem.

Thanks again,
Allan
Chevy Mechanic: Dan, ASE Certified Technician replied 8 years ago
Thanks for letting me know.
They have a couple of bulletins on these. One for the Flex fuel engine for the gaskets leaking and another one for the intake warping.
Glad you got it fixed and thanks for using Just Answer!
Ask Your Own Chevy Question
Ask Dan Your Own Question
Dan
Dan
Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2,270
2,270 Satisfied Customers
Experience: 20 Year Factory Trained Current GM Technician

Dan 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

15,249 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,196 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,847 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

2,900 satisfied customers

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

Ron Z.

Ron Z.

- Chevy Tech -

2,682 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Dealership wanted to replace engine. 2010 Chevy Silverado
Dealership wanted to replace engine. 2010 Chevy Silverado 5.3L engine but husband decided on oil pump and mechanic pressure checked oil pick-up tube which he discovered had several leaks around connec… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
When I start the engine, the power steering automatically
when I start the engine, the power steering automatically forces the wheels all the way to the left. They are then locked there and I can't move them. … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,913 satisfied customers
Check engine light is on... It spudders at an idel. And
Check engine light is on... It spudders at an idel. And sometimes doesnt start .. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No power to fuel injectors when engine cranks. Fuel
no power to fuel injectors when engine cranks. Fuel injectors are brand new. rtruck runs when gas is poured into carborater. 1989 gmc suburban 350 motor … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2002 Chevy Blazer with 4.3 engine. Frequently will not start
2002 Chevy Blazer with 4.3 engine. Frequently will not start after setting overnight. Dribble a little gas in the intake and it fires up and runs fine. May or may not start after sitting a few hours. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Engine is so hot burns plug wires Engine gets so hot outside
engine is so hot burns plug wires Engine gets so hot outside until it burns plug wires … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,943 satisfied customers
86 K10 temp. gauge goes to hot and engine dies, but engine
86 K10 temp. gauge goes to hot and engine dies, but engine is still cool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1996 chevy Silverado k2500 5.7 vortec engine engine light on
1996 chevy Silverado k2500 5.7 vortec engine engine light on po300 random misfire detected we replaced plugs wires Distributor cap and rotor pickup coil checked compression everything is good there ch… read more
Michael Solis
Michael Solis
261 satisfied customers
It will not start the engine will turn fine but will not
It will not start the engine will turn fine but will not start i replaced the fuel pump but it made no difference i also tried changing the fuel pump relay but that did nothing … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Wash engine but do not start engine. Its ok. Everything is
wash engine but do not start engine JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: Yes its ok JA: What is the model/year of your Chevy? Customer:… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
I got a crate engine 10066038 in back of the engine i says
i got a crate engine 10066038 in back of the engine i says im0918 6vp can you tell me more about this engine? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My car won't start it says engine power reduced, engine
Hello my car won't start it says engine power reduced, engine disabled, and service esc … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Have a 2009 HHR, 2.4 L engine. Check engine light came on,
Have a 2009 HHR, 2.4 L engine. Check engine light came on, had scanned at AutoZone. Code P0010, with definition: intake camshaft position actuator solenoid, control circuit bank 1. Explanation:ECM has… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Check engine light, reduced engine power, service power
check engine light, reduced engine power, service power steering mesaages … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Now I have a P0300 check engine light code. Swapped out coil packs. Drive down the road perfectly. What do I do next?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 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