GMC

GMC Troubleshooting Questions? Ask a Mechanic for Answers

Ask an Expert,
Get an Answer ASAP!

GMC

1997 GMC Suburban. Crank, but no start. Battery replaced.

Customer Question
1997 GMC Suburban. Crank...
1997 GMC Suburban. Crank, but no start. Battery replaced. Distributor cap replaced. Good spark, but no fuel on spark plug. Dropped gas tank and no power to fuel pump. No voltage across pins 87 and 30 in relay.
Submitted: 25 days ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Customer reply replied 25 days ago
12.51v between positive battery terminal and pin 86 on fuel pump relay.
Customer reply replied 25 days ago
11.9v between negative battery terminal and pin 87 on fuel pump relay.
Answered in 21 minutes by:
11/16/2017
GMC Mechanic: Pete, GMC Mechanic replied 25 days ago
Pete
Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 29,829
Experience: GM training and dealer tech for 14+ years. Diagnostics
Verified

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

In the under hood fuse box locate the fuse ECM B ( 20 amp fuse) and make sure it is o.k.,this supplies the missing power.If this fuse is blown it will need replaced.If the fuse is blown the most common cause is the fuel pump being shorted or drawing to many amps so if you replace it and it shorts again unplug the fuel pump and see if it shorts again.If it does not then the pump needs replaced.If this fuse is o.k. test to see if it has around 12 volts DC on one terminal this fuse seats into with key on or off and let me know.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated ( should be a link to click on here or above).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 GMC Question
Customer reply replied 25 days ago
Checked ECM B fuse with ohmmeter and it is good. 11.95v on one side of the terminal that this fuse inserts into.Checked voltage from negative battery terminal to pin 85 on fuel pump relay and it reads little to no voltage. I thought this was supposed to read 12v.
GMC Mechanic: Pete, GMC Mechanic replied 25 days ago

It should but only the first 2 seconds the key is on or when cranking.

Try cranking it over or test the first 2 seconds and let me know what it shows for voltage at 85

Also re test 87 and see if you have around 12 volts and let me know.Key on first 2 seconds.

Thanks Pete

Ask Your Own GMC Question
Customer reply replied 25 days ago
Though to test solo so just used autostart. 87 was at 12.3v, dropped during crank and came back up to just over 12 shortly after. Pin 85 did read 11.4v just before autostart.
GMC Mechanic: Pete, GMC Mechanic replied 25 days ago

With the relay installed does it click when you first turn on the key the first 2 seconds?

Do you have a constant ground signal on 86 at all?

Ask Your Own GMC Question
Customer reply replied 25 days ago
the relay does click when turned on the first 2 seconds. How do you recommend testing the constant ground on 86. When I test across positive side of battery to 86 it shows battery voltage. During start the voltage drops and returns which I am guessing is just the draw on the battery.
GMC Mechanic: Pete, GMC Mechanic replied 25 days ago

O.k.,if it clicks then you have the ground signal.And you have power on 87 which is what sends power to the fuel pump when the relay is energized.Re test the voltage at the pump gray wire and see if you have at or near 12 volts at it with the key on the first 2 seconds.If you do and the pump does not run test the black wires for ground at the pump.If these are o.k. then the pump needs replaced.If you are missing power at the pump then there is a break in the wiring leading from the relay to the pump needing located and repaired.

If you are missing ground at the pump trace the black wire to the frame ground and clean and tighten it.Remember you will only have power at the pump the first 2 seconds the key is on as well as when cranking over the engine.

Let me know if you need anything else and feel free to rate my help here or above ( should be a link to click on ) as this is how I receive credit for my time,this can be done at any time and you can still come back here and reply if needed.Your 5 star rating is appreciated

Thanks Pete

Ask Your Own GMC Question
Ask Pete Your Own Question
Pete
Pete
Pete, GMC Mechanic
Category: GMC
Satisfied Customers: 29,829
29,829 Satisfied Customers
Experience: GM training and dealer tech for 14+ years. Diagnostics

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:

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

1,696 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,552 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

576 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

259 satisfied customers

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

George H.

George H.

ASE MasterTechnician

226 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

218 satisfied customers

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

< Previous | Next >

Related GMC Questions
Idle engine. 285000 VVM envoy 2003 XL. Also battery not
This just happened todayhvnt had a chance to do anything as yet… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
576 satisfied customers
Battery saver light came on. Battery test with the engine
Battery saver light came on. Battery test with the engine off at 12.7 VDC, With the engine running at an idle 15.7 VDC. Trying to locate the issue … read more
Mechanic01
Mechanic01
1,288 satisfied customers
Trying to remove battery and cant get cables off, i dont
trying to remove battery and cant get cables off JA: Okay, I'll connect you to the mechanic to go over that information regarding your GMC. Before I do, is there anything else you want him to know? Cu… read more
Pete
Pete
GMC Mechanic
29,829 satisfied customers
1997 GMC Suburban. Crank, but no start. Battery replaced.
1997 GMC Suburban. Crank, but no start. Battery replaced. Distributor cap replaced. Good spark, but no fuel on spark plug. Dropped gas tank and no power to fuel pump. No voltage across pins 87 and 30 … read more
Pete
Pete
GMC Mechanic
29,829 satisfied customers
The battery on my 2008 acadia went flat charged it up but
The battery on my 2008 acadia went flat charged it up but now the car wont start and there is no power to the tailgate. When I turn the key all I get is a clicking noise from the fuse box … read more
roy
roy
Associate Degree
3 satisfied customers
Will not idle, just noticed that the negative battery cable
Will not idle, just noticed that the negative battery cable is disconnected, also there is a hollow line along the drivers side just under the hood that is broken. Not sure if this is causing the stal… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,072 satisfied customers
Battery died, charged up, restarted - radio locked, to
Battery died, charged up, restarted - radio locked, hoe to unlock? 2015 gmc terrain … read more
Don - Mo Lurch
Don - Mo Lurch
ASE Certified Technician
Vocational, Technical or Trade Scho
218 satisfied customers
I have a 1997 GMC Jimmy. The battery drains if left off for
I have a 1997 GMC Jimmy. The battery drains if left off for 2 nights. Say driven on a Monday morning and left until Wed. AM. Then battery drained. Charges up quickly. I have gone through the Multimete… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Battery is dead all of a sudden. symble on dash = Battery
battery is dead all of a sudden. symble on dash = Battery malfunction It's a 2013 Acadia … read more
AZTechBrian
AZTechBrian
ASE Certified Technician & Shop Owner
Vocational, Technical or Trade School
732 satisfied customers
Will defective O2 detectors drain the batteries? New
Yes, Pulled fuses 1 by 1. Sitting idle battery is drawing 4 amps. … read more
roy
roy
Associate Degree
3 satisfied customers
I was cleaning the battery cables and reattached them and
I was cleaning the battery cables and reattached them and now the truck will not start. … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,047 satisfied customers
Hard starting. New battery, it cranks great, acts like no
New battery, it cranks great, acts like no fuel or no spark.. Changed plugs,wires,both O2 sensors, throttle position sensor, mass air flow sensor. Hasn't changed the start. Runs great after a few seconds running rough … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
576 satisfied customers
Battery light was on this am but alt is charging. Battery
Battery light was on this am but alt is charging. Battery was dead but is 6 years old. … read more
Pete
Pete
GMC Mechanic
29,829 satisfied customers
Won't start. Has new battery. Wont jump wither. 02 Sierra
Won't start JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: has new battery JA: What is the model/year of your GMC? Customer: wont jump wither JA:… read more
Pete
Pete
GMC Mechanic
29,829 satisfied customers
I have 2009 Yukon Hybrid. Started today and "service battery
I have 2009 Yukon Hybrid. Started today and "service battery charging system and service power steering warning came on? I had 11.91 at the battery while running and 12.21 when the vehicle was off. An… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
Voltmeter shows battery at 12.5 volts. Dash gauge shows 7-8
Voltmeter shows battery at 12.5 volts. Dash gauge shows 7-8 volts. Started and backed up and needed to move a couple feet more and engine will not turn over, no sound at all???… read more
roy
roy
Associate Degree
3 satisfied customers
Battery dead cant get into neutral and key stuck in
battery dead cant get into neutral and key stuck in ignition … read more
TODD RUZICKA
TODD RUZICKA
AAS
46 satisfied customers
Battery goes dead overnight, BAttery is good. Alternator is
BAttery is good. Alternator is good. I have pulled every fuse and can't find a circuit that is causing the draw. … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,552 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