Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

1999 chev 1/2 ton 4.8 v-8. starts fine and idles, put in…

Customer Question
1999 chev 1/2 ton...

1999 chev 1/2 ton 4.8 v-8. starts fine and idles, put in drive and accelerate, and the engine appears to be starving for fuel, let up on accelerator and engine returns.. about 1/4 throttle and the starving of fuel appears.

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

Bought truck at auction, no idea of mileage, does not put out black smoke.

Mechanic's Assistant: What is the model of your '99 Chevy?

Silverado

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

Will try to fix myself. checked fuel pressure at idle, 60#, crack throttle open under hood , pressure drops to 45#, starvs and the pressure pops up to 60#

Submitted: 8 months ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 5 minutes by:
9/24/2017
Chevy Mechanic: BOBBYSS, Master Technician replied 8 months ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,580
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
Verified

Hello, my name is***** you tell me if the check engine light is coming on?

Ask Your Own Chevy Question
Customer reply replied 8 months ago
no
Customer reply replied 8 months ago
no the check engine lite is not on
Chevy Mechanic: BOBBYSS, Master Technician replied 8 months ago

Thank you. There are a lot of possible issues here. It sounds like a throttle position issue. Do you have a scan tool that reads live sensor data? It can also be a clog in the exhaust from a failing catalytic converter.

Ask Your Own Chevy Question
Customer reply replied 8 months ago
I do not have a live data sensor tool. how do i check for a plugged cat. where is throttle position sensor, is it on left side of throttle body?
Chevy Mechanic: BOBBYSS, Master Technician replied 8 months ago

You have a throttle sensor on the side of the throttle body. The cat is best checked with a back pressure tester at the oxygen sensor outlet. If you do not have one you can check engine vacuum. If you hold the engine rpm steady at 2000 rpm watch the engine vacuum. It should hold steady. If it starts tapering off then you have a clogged exhaust.

Ask Your Own Chevy Question
Was this answer helpful?
Ask BOBBYSS Your Own Question
BOBBYSS
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,580
17,580 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

15,289 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
2005 Chevy Trailblazer: 2wd..secondary air injection malfunction
I need some honest and open advice about my issue. I am at the end of my rope with this stupid car!!! So here are the particulars: I have a 2005 Chevy Trailblazer 2wd 6cylinder with the dreaded p4010 … read more
Michael Moore
Michael Moore
Team leader, bumper to bumper tech.
Associate Degree
1,323 satisfied customers
where is bank 2, sensor 1 & bank 1, sensor 3 on a 98 chevy
where is bank 2, sensor 1 & bank 1, sensor 3 on a 98' chevy 3.8 camaro?… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
1996 chevy blazer 4.3 vortec,cranks wont start,have fire,fuel
1996 chevy blazer 4.3 vortec,cranks wont start,have fire,fuel pressure is good,no check engine light.What should I ck next ?… read more
zzdaryl
zzdaryl
Lead Auto Tech
Some college and advanced training
4 satisfied customers
The dealership said I need to replace exhaust camshaft
the dealership said I need to replace exhaust camshaft solenoid valve and pigtail connector. and said it would be about $315, could this be the reason my engine light is on and also is this a decent p… read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,734 satisfied customers
Swapped the battery in 2008 corvette, now the dual exhaust
swapped the battery in 2008 corvette, now the dual exhaust sounds like it is in competition mode … read more
Marvin the Mechanic
Marvin the Mechanic
87 satisfied customers
Need new catalytic converter. Looked under truck to find the
Need new catalytic converter. Looked under truck to find the muffler is before the cat and the connecting flange is cut off by Midas a few years ago. Can I mount the cat behind the muffler, and how to… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,304 satisfied customers
Rotten egg smell, was told its the catalytic converter but
rotten egg smell, was told its the catalytic converter but not sure.. while doing a steady 30mph+ truck seems to skip and sounds like its dogging out … read more
Pete
Pete
Mechanic
Construction, Plant Fitter
136 satisfied customers
Engine light on" clean exhaust filter continue to dric. Ve
engine light on " clean exhaust filter continue to dric … read more
BOBBYSS
BOBBYSS
Master Technician
17,580 satisfied customers
My catalytic converter went on my 2008 Impala I think
My catalytic converter went on my 2008 Impala I think because I had a wiring problem that made the fuse blow that controlled the circuit for the O2 sensors. Also I had a AIR valve that was stuck in th… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
My catalytic converter failed a couple of years ago. I think
My catalytic converter failed a couple of years ago. I think it was a combination of a stuck AIR valve and a wiring problem that kept causing the fuse that controls both O2 sensors and the EVAP soleno… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I Want To Take Out The CATALYTIC CONVERTERS on my 2005 chevy
I Want To Take Out The CATALYTIC CONVERTERS on my 2005 chevy malibu can i disconect the stabilyzer ends and tist it to remove the cat … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Pete again, lack of power like a catalytic converter is
Hey Pete again, lack of power like a catalytic converter is stopped up or air filter stopped up, no codes, checked back pressure on pre-cat 02 sensors and after cats, doesnt appear to have stopped up … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Chevrolet 2500 HD Duramax: Have a 2011 Chevrolet Duramax diesel.
Have a 2011 Chevrolet Duramax diesel. 85,000 miles. Code PO420 doesn't want to stay cleared. Dealership's do a manual regen and say "I hope this helps". They are puzzled. This only occurs when I drive… read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
Chevy Trailblazer has no power
I have a 2004 Chevy Trailblazer V6 that has almost no power from a standing start. I first noticed it when it almost refused to pull my boat up the ramp. I had to put it inXXXXXlow range to get it to … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
My 2002 chevy trailblazer is making a thud or clunk noise(it
My 2002 chevy trailblazer is making a thud or clunk noise(it seems to be right under neath your feet in the driver or passenger front seat) while driving. Sometimes when we pull out of the driveway it… read more
Mazda Ed
Mazda Ed
Lead Technician
High School or GED
1,963 satisfied customers
My starter will not disengage.
My starter will not disengage. Stays in run, even with the key switch in the off position… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,866 satisfied customers
Impala: a rattling noise even when the car is in park..shops
hello. my 04 impala is making a rattling noise even when the car is in park. the engine is not using oil nor smoking. i have been to 3 different shops and each has said something different. We thought… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,289 satisfied customers
98 Tahoe: 5.7L..what size are the fuel line fittings that attach
On a 98 Tahoe 5.7L, what size are the fuel line fittings that attach to the motor… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,866 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