Question about 1998 GMC Sierra

1 Answer

1998 GMC Sierra- runs rough then stalls when

1998 GMC Sierra with 5.7 vortec. runs rough then stalls when stepping on accelerator. Have put on new fuel pump, new fuel pressure regulator, new fuel pump relay, new air filter. No leaks in fuel lines, truck starts and runs but loses pressure and stalls out still. Pressure about 62 then drops. please help

Posted by on

  • 6 more comments 
  • Jamie Stanley
    Jamie Stanley May 11, 2010

    62 is that a fuel pressure test?

  • carhob May 11, 2010

    did u check if voltage at pump was fluctuating?

  • duane wine May 11, 2010

    what about fuel filter ?

  • Anonymous Mar 12, 2014

    Where is the fuel pressure regulator located on 2002 gmc sierra v6

  • Anonymous Mar 14, 2014

    Gmc sierra stRtung and stalling out

  • Anonymous Mar 16, 2014

    Replaced fuel pump and oil pressure sensor truck will idle but will not run it stalls in gear and turns off

  • Anonymous Mar 17, 2014

    put new oil pump on gmc denali stil no oil pressure

  • Anonymous Mar 31, 2014

    no gas to engine

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,055 Answers

Had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1998 gmc z71 surges in drive p1345


The P1345 means SGC (Cam Position) sensor circuit malfunction/crankshaft position-camshaft position correlation
P0300 means random/multiple cylinder misfire detected

mpps ecu chips

Aug 07, 2012 | 1998 GMC Sierra

1 Answer

I have a 1998 GMC Sierra, 5.7 liter Vortec 4x4. It has 160k miles. I have noticed that it idles at around 500 rpms when its warmed up. Not sure if this is normal. However, I have noticed a bit more...


The normal idle for your engine should be 550 to 600 RPMS so thats not to far off . But the fluctuation is more likely the crank pisition sensor then the EGR valve this engine has a condution called crankshaft wip witch is normal but going down a rough road can somethimes set off a misfire code It wouldn't be a bad idea to take the EGR valve off and clean it and check it but the CPK would give you the fluctuation in RPMS . It still could be a few outer things but this it the most likely cause

Apr 02, 2011 | 1998 GMC Sierra

2 Answers

1995 gmc sierra automatic. When I accelerate to the floor it has no power but when I let off on the accelerator it seams to pick up speed. will not run faster than 65 or 70 mph. I put HEET in the fuel...


it is definately a fuel problem, if you press gently it speeds up step on it and it just bogs, i think it has sommething to do with the ecm that controls timing and fuel at the TBI (throttlebody injectors) not a filter, i put a new pump,tank,filter and cleaned out the fuel lines and still could not cure the problem, then i heard of a few thigs that got me thinkin but when i was gonna tackle it a guy said he wanted to buy it so i told him the issue he didnt care and i sold it. but those were the only things left to do.

Jan 14, 2011 | 1995 GMC Sierra C1500

1 Answer

My 19991 GMC Sierra 5.7 litre engine runs great when its cold but after 5 minutes it is very slow in accelerating . When I take off first thing in the morning I could easily smoke the tires but as soon as...


while motors warm up the computer supplies information so the motor works well. After it warms up the computer is guided by sensor information. It sounds like a sensor is going bad. Try to get a scanner reading which might show which sensor. The two main imputs to fuel are oxygen sensor and temperature sensor. Real common for O2 sensor to go bad.

Apr 21, 2010 | 1991 GMC Sierra

1 Answer

96 gmc vortec will not start


I AM LOOKING AT TIMING ISSUES OR INTAKE MANIFOLD LEAK.OR EGR VALVE STUCK OPEN.

Dec 30, 2009 | 1996 GMC Sierra

1 Answer

Stalling


Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.

Nov 01, 2008 | 1998 GMC Sierra

2 Answers

Same thing here...


sounds like a restriction some where in your fuel system example dirt or anything that might get in your system check your filter and look for contamiation or possilbly a airation problem

Aug 22, 2008 | 1998 GMC Sierra

Not finding what you are looking for?
1998 GMC Sierra Logo

2,286 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75077 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...