Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

We have a H90XL with a v 6 gm engine. purchased in 1992. The…

Customer Question
We have a H90XL...

We have a H90XL with a v 6 gm engine. purchased in 1992. The machine starts fine in any weather but runs rough and has no power and also backfires a lot. Could the carburetor be out of adjustment? We have good spark and we do not have any icing problems.

Mechanic's Assistant: What is the complete model and serial number of your machine?

H90XL Serial #F005D05730N

Submitted: 11 months ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 10 minutes by:
7/31/2017
Technician: Curtis B., Technician replied 11 months ago
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 31,403
Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.
Verified

Welcome to JUST ANSWER heavy equipment. With years of experience, I look forward to doing my best to help.

Ask Your Own Medium and Heavy Trucks Question
Technician: Curtis B., Technician replied 11 months ago

Gasoline or LP unit? Have the spark plugs and wires been replaced from distributor, or does it have coil packs? Backfiring can be distributor cap or rotor.?? This is GM Vortex V6?

Ask Your Own Medium and Heavy Trucks Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 2,785
2,785 Satisfied Customers
Experience: Owner at DJ Wilson

Daniel Wilson 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:

Daniel Wilson

Daniel Wilson

2,785 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,493 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,869 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,235 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,337 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

31,403 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
04 c 15 wants to skip and spoke at times no power. C 15
C 15 advertising don't have the serial number handy … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
What co trill. On a 3406E model cat engine are there two
On a 3406E model cat engine are there two different power supply's to the ecm for the 1 2 3 And the 4 5 6 Injectors because I have one not firing on 4 5 6 nd the harnesses are new from the ecm to the injectors … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
The AC on my Komatsu excavator works fine when I first start
The AC on my Komatsu excavator works fine when I first start it up and may work for 3 or 4 hours then it starts to blow hot air. Is this likely to be caused by the thermal expansion valve … read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a 2008 cummins ISM 350 that will crank but will not
I have a 2008 cummins ISM 350 that will crank but will not start. Cranking fuel pressure is 18 psi with new cummins reman pump. I have no CEL and no codes. It will start with starting fluid and runs f… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a Ford 641 that stopped running - at first it was
I have a Ford 641 that stopped running - at first it was running fine, then when i fixed the fuel shut off under the gas tank, it began to shut off after a few minutes, then completely quit. I've clea… read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
Bobcat 540 won't start unless you pour gas into the carb and
Bobcat 540 won't start unless you pour gas into the carb and keep pouring until it gets running well. … read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
Whats torque specs and valve adjuments on a cat 966b.
whats torque specs and valve adjuments on a cat 966b … read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
My bobcat 632 doesnt start. Turns over, sparks to spark
My bobcat 632 doesnt start. Turns over, sparks to spark plug, gas to the gold float? Cecked battery and it isn't holding a charge. Could that be the problem … read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
A friend hs a 1992 GMC Topkick Lopro with a 366 V-8. Truck
A friend hs a 1992 GMC Topkick Lopro with a 366 V-8. Truck has been sitting in a lot for three years without a battery and has not been started. I put a battery in this afternoon and cranked her over.… read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
My d21a-6 will not steer right. appears no power on left
my d21a-6 will not steer right. appears no power on left track … read more
Daniel Wilson
Daniel Wilson
2,785 satisfied customers
22 hp garden tractor starts, races real fast, and dies.
22 hp garden tractor starts, races real fast, and dies. … read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
I have a problem with my trencher machine i just rebuilt my
I have a problem with my trencher machine i just rebuilt my 3176 (3NL0061) engine … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Farmall 460 starting problem. it starts and runs for a few
farmall 460 starting problem. it starts and runs for a few seconds and then quits. if attempt to start it will not start until you wait for along while then runs for afew seconds and quits. … read more
Curtis B.
Curtis B.
Technician
31,403 satisfied customers
My 2002 Cummins ISX 450 has rough idling problem. engine
It starts out fine,but afrer I run it for a little bit,at my next stop it would be running rough at idle. … read more
][\][iCk0411
][\][iCk0411
Fleet Warranty Manager
Vocational, Technical or Trade School
5 satisfied customers
My 2007 Freightliner with a C-9 engine spits, sputters,
My 2007 Freightliner with a C-9 engine spits, sputters, makes a backfiring noise and loses power in 4th,5th and 6th low gear. I was told it is the tranny but was also told the fuel injectors. What do … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,493 satisfied customers
will a model D32E-1 brake pressure every get low enough the
will a model D32E-1 brake pressure every get low enough the brakes will not work? everything else about brakes are fine s4d102.45705954… read more
Daniel Wilson
Daniel Wilson
2,785 satisfied customers
Ford F5000 with a 370, last winder it would not run, now aga
I have a Ford F5000 with a 370, V8 1982. last winder it would not run good, had no power, back fired, burned 5 gallons gas in 20 minutes, filled the oil pan with gas, it ended up being the EGR valve a… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,869 satisfied customers
Timing procedure for 1973 S1700 with a 392 V-8, holley 4
Timing procedure for 1973 S1700 with a 392 V-8, holley 4 barrel carb, and holley dist, runs great, then all sudden, runs rough, backfires etc. Ex-military with only 1215 miles, I re-build carb, and ne… read more
Curtis B.
Curtis B.
Technician
31,403 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