Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevrolet: I have a k3500 7.4 silverado dually. Was driving…

Customer Question
I have a k3500 7.4...
I have a k3500 7.4 silverado dually. Was driving and truck started chugging missing and stopped. Checked fuel pressure its good. Truck cooled off started back up drove it it died after it got hot again. Could it be the ignition modual?
Submitted: 3 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 24 minutes by:
5/30/2015
Chevy Mechanic: Randall C, ASE Master Tech replied 3 years ago
Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 13,440
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
Verified
Hello, My name is***** will do my best to assist you. Unfortunately, no way to be 100% but by description? knowing underhood heat related, symptoms etc?> yes,, in fact 3 things come to mind,The distributor caps on this engine had many known issues, carbon cracks and can cause this, and,, the ignition module? along side of the coil? yes, 100% can cause this and lastly? the coil wire could be breaking down, Unsure which order to go with but in the shop? we go with cap and wires first especially if aged, problem continues>/ then yes, ignition module. I tend to lean to the module but had to list the other commons for this
Ask Your Own Chevy Question
Customer reply replied 3 years ago
I have new cap wires. It seems maybe a fuel problem but i have good pressure. What about fuel pressure regulator.
Chevy Mechanic: Randall C, ASE Master Tech replied 3 years ago
well, you stated good fuel pressure, what is the reading? does pressure fall off with key off? does engine start with carb cleaner/starting fluid after it stops and will not restart
Ask Your Own Chevy Question
Customer reply replied 3 years ago
Truck starts but is chugging and when you give it gas it wants to die
Chevy Mechanic: Randall C, ASE Master Tech replied 3 years ago
ok, then fuel pressure may still be the problem, I thought it did not run when hot, but fuel pressure needs to be about 52-62 psi, it will not be the regulator unless.. you hook up fuel guage and the pressure drops to zero when you turn key off, if pressur e holds, then reg is not the problem, I was only going by you saying fuel pressure is good and asked for the pressure reading, if you have not checked fuel pressure? then that has to be step one before going to ignition, I was answering based on your initial statement of pressure is/was good, Hope this makes sense
Ask Your Own Chevy Question
Customer reply replied 3 years ago
If truck sits for 30 min or so cools off it starts up runs fine until it heats back up then starts to make popping noise and wont run when you give it gas. I can hear fuel pump cycling so i figured pump is good.
Chevy Mechanic: Randall C, ASE Master Tech replied 3 years ago
ok, that sound does not mean pump is good, One must have fuel pressure guage hooked up, Pumps can go bad and still run. some parts stores will rent the guage or you can buy cheap.I still lean to ignition module as pumps do not usually act up only when warm BUT can, I can only say the pressure readings,, which you have, the possibles, and should it quit running and not start right back up, then spray some carb cleaner in the air intake, if it then starts/stalls? you have fule problem and likely pump is bad, if still not run on crab cleaner? then ignition module
Ask Your Own Chevy Question
Customer reply replied 3 years ago
Truck starts ok but idle surges up and down and if you give it gas it wants to die
Chevy Mechanic: Randall C, ASE Master Tech replied 3 years ago
I understand, I realize you want a 100% answer but I can not give that, I can only tell you how to diagnose and the possibles, You need to read fuel pressure,, I am going to opt out. Open the question up to the other experts. Please.. save the rating for the next expert that can help you. Sorry I could not, I have sent as much information as possible
Ask Your Own Chevy Question
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
Verified
Hello, my name is***** am a different expert. Thanks for the question. If I am not online when you return please give me some time to get back to you. Randall is correct that the actual fuel pressure should be tested. If you do not have a fuel pressure gauge most auto parts stores loan them out. The pump may be failing which typically means it either goes completely out or as it starts to fail the pressure drops off as it heats up. I would suspect that it is the ignition module or possibly a failing crank sensor. Both are common heat related failures on this engine. I have also changed a number of failed distributors on this engine also. If you do not have many tools for testing you can remove the ignition module and take it to your local auto parts store and most of them can test it. If it gets hot while they are testing it then it needs to be replaced. I would also make sure that the fuel pressure is above 55 psi. If you have a fuel pressure gauge installed when the problem occurs see if the pressure drops off at that time. If it does then the pump is failing. I hope this helps. Let me know if you would like further help.
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 BOBBYSS Your Own Question
BOBBYSS
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
17,611 Satisfied Customers
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH

BOBBYSS 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

15,756 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,642 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

2,953 satisfied customers

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

Ron Z.

Ron Z.

- Chevy Tech -

2,836 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
I have 1994 c1500 5.7. When the truck is cold it starts just
I have 1994 c1500 5.7. When the truck is cold it starts just fine then when it warms up it dies and will not restart until it cools down. … read more
Randall C
Randall C
ASE Master Tech
13,440 satisfied customers
Chevrolet Silverado 1500: I have 2000 Silverado with a 4.3
I have 2000 Silverado with a 4.3 vortec. It starts up and after a min. or two it dies. It starts right back up and repeats… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet K3500: I have a 2000 K3500 with the 7.4 and 145,000
I have a 2000 K3500 with the 7.4 and 145,000 mi. Truck starts good all of the time, but until it is driven for a while, it hesitates and it will miss pulling a load. It runs fine after initial hesitat… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet Express 2500: 2004 Chevrolet Express Van - Drive
2004 Chevrolet Express Van - Drive 150 miles, fill up with gas and leaving the station the car shakes and feels like it will hardly go and Check Engine light comes on. Computer showed spark plugs were… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,884 satisfied customers
Chevrolet K3500 4x4: i have a 2000 k3500 7.4 dually. the truck
i have a 2000 k3500 7.4 dually. the truck ran out of gas. filled it up got fuel pressure and there is no spark from the coil. now about one month previuos or 400 miles i replaced the distributor becau… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,884 satisfied customers
1999 chev truck K3500 7.4 dually automatic. 176k miles. We
1999 chev truck K3500 7.4 dually automatic. 176k miles. We traded for this truck and it was running badly so I first did a compression check which it did well on. I then installed plugs, wires, rotor,… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
88 Chevy: I lose power to the fuel pump at this time..sits..restart
I have an 88 Chevy k3500 with a 7.4 It will start and then shut of after about a min. I lose power to the fuel pump at this time. If the truck sits for a few hrs it will restart but then shuts off aga… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,884 satisfied customers
1994 Chevy Suburban 1500: w/350..Ignition fails in hot weather. Shuts
1994 Chevy Suburban 1500 w/350. Ignition fails in hot weather. Shuts of unexpectedly while driving in 100 degree plus weather. Won't restart for 5+ minutes. Then seems fine.… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
4.3 v6 I was driveing..spark plugs..rotor..fuel filter..stalls
i have a 2003 silverado with 4.3 v6 I was driveing and just started running funny and died. I replaced the spark plugs, cap and rotor,coil,fuel filter and ingnition module i think. I have reset the co… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
chevy: dually..Just replaced front and rear brakes. Bled..test drove
I have 1996 C3500 chevy silverado 7.4 dually. Just replaced front and rear brakes. Bled the system, turned front rotors test drove. I am not happy with braking action after my test drive. This truck i… read more
Ted G.
Ted G.
Technical/Sales Trainer
Vocational, Technical or Trade Scho
4,376 satisfied customers
My 1995 k3500 with the 454 in it randomly stalls..ignition switch
My 1995 k3500 with the 454 in it randomly stalls while driving. I remedied the problem by replacing the ignition switch. After 3 weeks of trouble free driving the problem returned but now the truck di… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
Suburban: 4x4..dies..driving, then blows rich smelling smoke
Have an 02 suburban 4x4 1500 w 5.3 engine. chugging and dies while driving, then blows rich smelling smoke out tailpipe. Thought it was oil pressure switch but wasnt, then thought it could be harmonic… read more
Joel
Joel
GM Journeyman technician
Associate Degree
1,230 satisfied customers
99 chevy S10: V6..dies..a while it starts right up and runs fine
99 chevy S10 4.3L V6. Drives fine most of the time but occasionally dies. After sitting for a while it starts right up and runs fine. Had to go get my son and give his friends a ride home last night a… read more
zzdaryl
zzdaryl
Lead Auto Tech
Some college and advanced training
4 satisfied customers
My truck..once temperature reaches 205 deg. it shuts..restart..dist
My truck will start if it cool. once temperature reaches 205 deg. it shuts off and will not restart until cool again. found a bad dist. cap. replaced it. still same problem. this is a 1999 chevy s10 4… read more
John
John
Master A.S.E Automotive technician
2 YEARS COLLEGE
4,071 satisfied customers
i blew my rear brake main line..abs..shifts..rpm..trans but i
i blew my rear brake main line and had to plug it off at the proportioning valve to get to help but when i hit the brakes the abs would not let the truck stop i replaced the brake line but now the tru… read more
William
William
Store Manager
High School or GED
42 satisfied customers
gm: motor home..abpou 50 miles and died going down road..ecm..stalled
i have a 200 gulfstream motor home with a 7.4 gm engine we are having a problem with the power-drove 1000 miles no problems--stopped and would not start--after a wile it started and wentr abpou 50 mil… read more
Doctor Automotive
Doctor Automotive
Technical Consultant
Vocational, Technical or Trade Scho
128 satisfied customers
1989 2.8 litre Z-24 cavalier. the engine starts fine in the cold...
i have a 1989 2.8 litre Z-24 cavalier. the engine starts fine in the cold...but when the engine hits operating temp. the engine stops running and will turn over but will not start. before the engine s… read more
frank
frank
Vocational, Technical or Trade Scho
1,892 satisfied customers
1995 chevy: 3/4 ton 4x4 gvw 8600 454 dual fuel..propane..shifting
I have a 1995 chevy silverado 3/4 ton 4x4 gvw 8600 454 dual fuel, propane and gasoline. a couple days ago I felt it starting to loose power not really shifting right, I tried both fuels it seemed to h… read more
Kyle N
Kyle N
Automotive Technician
Vocational, Technical or Trade Scho
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