Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

No spark at coil. It's actually a 2003 GMC sierra. Tested…

No spark at coil ...

No spark at coil

Mechanic's Assistant: What is the model/year of your Chevy?

It's actually a 2003 GMC sierra

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

Yes . Tested coil with a multimeter checked for 12 v from ignition module wires and coil wire

Mechanic's Assistant: Have you checked all the fuses? Do you have a wiring diagram?

I have checked all ignition fuses visually and with a continuity tester they are good

Show More
Show Less
Ask Your Own Chevy Question
Answered in 1 minute by:
3/14/2018
Gunvir Singh
Category: Chevy
Satisfied Customers: 2,013
Experience: Master Tech at Kennesaw Auto Tech
Verified

Hello, let me review your request. Please stand by.

Ask Your Own Chevy Question

What size engine do you have?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
4.3

Do you have fuel injector pulse present when you try to start?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I have not checked that. How?

Need to check voltage present at the fuel injector connector when engine is turned over?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Voltage is present when turned over

OK. does the Pink wire at the ignition module and the coil both have 12 volts while Trying to start?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
sir they both do

Does the black wire at the ignition module for a good chassis ground?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I connected with a tester and got no continuity

The ground?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
but I just wiggled it around a little and cot ground so maybe the wire broke off right by the connector?

Possible. A constant ground is needed for ignition signal to be present.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Ok should I repair the wire and connector before going any further or can I jump it just to see if it starts?

Yes, definately. Once the wire is repaired try to start. If still no start then check White wire at the ignition module and see if there is a 5 present while cranking.

Ask Your Own Chevy Question

Hello, just checking if any updates?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I had to order a new connector, will be in tomorrow or Saturday. None of the local parts stores had it

No problem. Keep me posted.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Got the pigtail in today I will install and let you know.
Customer reply replied 1 month ago
Ok new connector installed and still no spark at coil
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified

Let's back up. You have power at the coil connector, yes?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Yea

OK, and if you probe the white wire on the coil connector with the test light attached to B+ and crank the engine, does the test light flash?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
I'll try and reply back

OK. I may step away from my desk, but don't despair, I'll come back and follow up with you shortly.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Ok

I am back and ready when you are.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Ok I don't have anyone here to crank it. Is there any way to do it by myself?

If you can prop up the test light in a way that you can see it. I've done it myself, you have to get a little creative with how you set up the test light, but it's possible.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Ok other end of test light on ground or pos?

Other end on pos.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Test light does flash on white wire when cranked

OK, that's good! Put all of that back together, and remove the large coil wire and place it next to a ground, we want to see if the coil is making spark or not. Can you do this by yourself?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
We'll see hahah

:-)

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Hey I think I messed up. I was testing the new connector on the icm, it did flash on the white wire when cranked, but I just tried the white wire on the connector on the actual coil plug and got nothing

OK, white wire to ICM flashes, white/black wire to coil does not, is that right?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
That's correct

This flashing ground to the coil is generated by the ICM. Testing indicates the ICM is no good.

With your test light still attached to B+, is there ground on the black wire to the ICM connector?

Ask Your Own Chevy Question
Customer reply replied 1 month ago
sir

ICM is apparently failed. Replace ICM.

Ask Your Own Chevy Question
Customer reply replied 1 month ago
Ok will get one and update when installed
Customer reply replied 1 month ago
Thank you

You're welcome, let me know how it goes!

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified
Jerry Newton and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 1 month ago
Ok here's the update. I got the new icm, installed it. And truck started right up and ran fine for about 30 minutes in the driveway. However, this morning I was driving to work and it started sputtering and died on me again, it started a couple of times after it died (enough to get me off the road) and now will not start again.didnt get any trouble codes. Any ideas?
Customer reply replied 1 month ago
I'm going to run through the same tests I did previously to make sure it isn't the same thing, but it's almost like a fuel pump going out. But I had a fuel pressure gauge hooked up the whole time it ran last night and it stayed at a constant 48 +/- psi the whole time
Was this answer helpful?
Ask Jerry Newton Your Own Question
Jerry Newton
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,628
5,628 Satisfied Customers
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

Jerry Newton 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

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 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

2,918 satisfied customers

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

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Engine shuts off an on while interior electronics do the
Engine shuts off an on while interior electronics do the same while driving. Loss of ground? … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
I went to leave for work this morning and the engine barely
Hi, I went to leave for work this morning and the engine barely turned over like the battery was really low almost dead so to speak. It did start but the voltage went so low the dash clock reset at 12… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
When driving down the road with little pull on the engine,
when driving down the road with little pull on the engine, it will start to surge. The rpms flux 2-4 rpms up and down. I put a new MAF sensor on it, but it did not help. There is no check engine light… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Replaced the battery, the engine will not turn over or crank
Replaced the battery, the engine will not turn over or crank when I turn the key to start, no noise (clicking) but the lights work. I checked the ignition fuse under the steering wheel it wasn't blown… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Engine power is reduced light is on and engine power is
Engine power is reduced light is on and engine power is reduced … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
Check engine light flashing when driving past 40 mph, engine
Check engine light flashing when driving past 40 mph, engine vibrating when idle or moving slowly, slight delay of starting up engine, and car has trouble accelerating as fast as it used to do. … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,734 satisfied customers
Is the Chevy Tracker 2.6 liter an interference engine.
Is the Chevy Tracker 2.6 liter an interference engine. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
My 8.1 vortex chev engine in a 5500 truck. 2004. The engine
My 8.1 vortex chev engine in a 5500 truck. 2004 . The engine quits like you shut it off it restarts right away and runs good. This happened 7 times in 200 miles. … read more
roy
roy
Associate Degree
3 satisfied customers
The 1983 Chevy C10 305 engine will not start. this is the
The 1983 Chevy C10 305 engine will not start. Roy this is the truck that has had a rebuilt engine installed, new alternator, starter and every other part I could think of replacing by a mechanic. Now … read more
roy
roy
Associate Degree
3 satisfied customers
2003 chevy silverado 4.8 engine reduced engine power light
2003 chevy silverado 4.8 engine reduced engine power light comes on no power … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,289 satisfied customers
Rough idle and surging engine power, then the service
Rough idle and surging engine power, then the service traction control/stabilitrac system comes up and check engine light flashes. My check engine light has been on for a while because of evap codes. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
Running engine stops or attempt to start engine fails, in a
Running engine stops or attempt to start engine fails, in a manner consistent with fuel starvation. Recently solved by installation of new fuel pump/sender unit, Problem has resumed approx two months … read more
Jerry Newton
Jerry Newton
Chevy Technician
5,628 satisfied customers
Engine rattle noise when cruising on V4 to V8. Front engine;
engine rattle noise when cruising on V4 to V8 JA: Where exactly do you think the noise is coming from? And how long has this been going on? Customer: Front engine; 3-4 weeks JA: What is the model/year… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
357 satisfied customers
Check engine light is on and autozone checked with their
check engine light is on and autozone checked with their computer code P2135 then it triggered code P0017. For P0017 this was already addressed as they changed a part for it already. … read more
Jerry Newton
Jerry Newton
Chevy Technician
5,628 satisfied customers
The check engine light is on. The code is P1810. It is a
The check engine light is on. The code is P1810. It is a 2006 Chevy 1500. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Started engine with remote! Engine ran for about ten seconds
Started engine with remote! Engine ran for about ten seconds died,tried with the key won't start ! Checked fuel pressure on a shrader valve ! No fuel!? … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
89 satisfied customers
1989 5.7 liter throttle body engine. I was driving, engine
1989 5.7 liter throttle body engine. I was driving, engine was running fine, and came to stop sign. Upon trying to accelerate from the stop, the engine would hardly run. Bad miss and backfire visible … read more
rpmdiag
rpmdiag
High school
7,511 satisfied customers
The reduce engine message and the engine light on and alot
the reduce engine message and the engine light on and alot if shacking when I started it this morning … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 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