GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

It sounds like it's going to dye at idle speed. I have

Customer Question
It sounds like it's...

It sounds like it's going to dye at idle speed. I have a1988

Mechanic's Assistant: How many miles are on the car? What size is the engine?

305 firebird with tbi fuel injection

Mechanic's Assistant: What year is your Firebird?

1988

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

I tried increasing the idle by adjusting the distributor

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No think that's it

Submitted: 9 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 3 hours by:
9/18/2017
GMC Mechanic: Matt, Engineer replied 9 months ago
Matt
Matt, Engineer
Category: GMC
Satisfied Customers: 23,204
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hello

This sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

1st thing to try is to remove the fuel filler cap and then flick the ignition on whilst listening for the brief ‘buzz’ of the pump

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,

Ideally measure the pressure at the injector rail (should usually be around 3Bar / 45psi +) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

You can also get this issue with contaminated fuel , if there’s water or dirt in the tank then either the petrol floats on top of the water or the filter sock on the pump is choked up – so if the other things check out then I’d consider pulling out the fuel pump and cleaning the filter sock

and its also worth trying loosening the fuel filler cap slightly as they have a 1 way valve built in to let air into the tank and so prevent a vacuum. if the valve is stuck the resulting vacuum can stall the fuel pump

Ask Your Own GMC Question
GMC Mechanic: Matt, Engineer replied 9 months ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer
Category: GMC
Satisfied Customers: 23,204
23,204 Satisfied Customers
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.

Matt 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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
I just replaced my engine with a new one in my 2015 canyon
I just replaced my engine with a new one in my 2015 canyon and now I'm getting 5 codes and the engine starts then dies right away … read more
roy
roy
Associate Degree
3 satisfied customers
My 2004 Yukon smells like gas. The engine light is on. No
My 2004 Yukon smells like gas. The engine light is on … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I change from my 2007 the engine. The engine was lbz. What I
Hi I change from my 2007 the engine JA: How many miles are on the car? Is it an automatic or a manual transmission? Customer: The engine was lbz JA: What is the model of your '07 GM? Customer: What I … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
We have a Yukon 2001, with almost 200K miles. The engine ran
We have a Yukon 2001, with almost 200K miles. The engine ran good and paseed Colorado emmissioons with out any issues. A couple of months back the head gasket started leaking a little and I had an ind… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
1991 gmc topkick with a 366 engine. code 42 keeps coming
1991 gmc topkick with a 366 engine. code 42 keeps coming on,already replaced both the knock sensor and spark control module. engine was just replaced timing is within spec. also keeps failing smog due… read more
roy
roy
Associate Degree
3 satisfied customers
My 04 envoy engine shakes at low idle and run good when
my 04 envoy engine shakes at low idle and run good when speed up whats the problem? … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
08 Yukon hybrid rebuilt engine everything comes on but won't
08 Yukon hybrid rebuilt engine everything comes on but won't crank nor start, code reader only shows not communicating rechecked sensors no broken wires can u help me … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
I currently have a 2007 GMC Canyon that the 3.7L I5 engine
I currently have a 2007 GMC Canyon that the 3.7L I5 engine block broke when valve dropped - replaced with 3.7L from 2008 and replaced engine/trans harness and dash harness, along with the PCM, TCM, BC… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
726 satisfied customers
I have a 2005 duramax 6.6 LLY. Engine will not start. Have
I have a 2005 duramax 6.6 LLY . Engine will not start. Have the fuel pressure up. But it will not fire. … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
On a 2009 GMC Acadia with a 3.6 engine which cylinders are
On a 2009 GMC Acadia with a 3.6 engine which cylinders are which numbers like 1 through 6 are 1 and 3 and 5 on the front or back head… read more
Ron Z.
Ron Z.
- GMC Tech -
Vocational, Technical or Trade Scho
279 satisfied customers
I have GMC SIERRA HD 2500 DIESEL. 2008. The Engine its
The Engine its shaking at Idle , but when I'm in the Freway It Sounds and Feels fine \ I had the Injector replace, Fuel Filter, and came back after 8 Months … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
I just changed my fuel filter on my 03 duramax because my
I just changed my fuel filter on my 03 duramax because my fuel gauge was faulty and now it filled up to half way and its getting to the full spot very slowly! What could this be?… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
Engine will idle but will not accelerate. car goes dead when
engine will idle but will not accelerate. car goes dead when you try to take off. I have replaced fuel filter and throttle control valve. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Check engine light is on. Message: engine reduced power
check engine light is on. Message : engine reduced power loss, gmc Yukon denali 2007 … read more
Ron Z.
Ron Z.
- GMC Tech -
Vocational, Technical or Trade Scho
279 satisfied customers
Driving and all of a sudden it says change fuel filter. Then
Driving and all of a sudden it says change fuel filter … read more
molurch
molurch
Owner
Vocational, Technical or Trade Scho
941 satisfied customers
1996 gmc 350 4L60 Transmission, replaced fuel filter,
1996 gmc 350 4L60 Transmission, replaced fuel filter, regulator, both converters, 2- 02sensors, sparkplugs, the truck bogs down on heavy accerlation. Hooked up the scanner, no codes, no light. Still b… read more
roy
roy
Associate Degree
3 satisfied customers
I changed the fuel filter on my 2003 GMC duramax it starts
I changed the fuel filter on my 2003 GMC duramax it starts then dies I pump it up then it starts and run fin … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
1992 GMC C7500 with cat 6.6L. changed fuel filters, how do I
1992 GMC C7500 with cat 6.6L . changed fuel filters, how do I bleed the system. … read more
Cat Man
Cat Man
Vocational, Technical or Trade Scho
2,990 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