Question about 1998 GMC Sierra

1 Answer

1998 GMC Turns over but won't start

I have a 98 GMC C1500, 5.0L, 4L60E. It turns over fine, but won't start. Fuel pressure is 60 while the fuel system is pressing up, then drops to 56 psi when the pump shuts off. It also has good spark. I scanned the computer, and have a P1870 DTC using an autoXray EZ-Read 2000. I can't find that code in any of the repair manuals I have. Any help would be greatly appreciated.
Thanks

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 121 Answers

P1870 is a transmission code. This code indicates a slippage in the trans between 1st and 2nd gear shift. This code would likely have nothing to do with your hard/no start issue.

Posted on Dec 08, 2008

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 4x4 5.7 replaced transmission now truck won't start it has a 4l60e transmission weak yellow spark to the plugs


hook up a scanner check for engine codes, if no codes hook up fuel pressure gauge, make sure all you wiring harnesses got reconnected underneath the vehicle

Oct 13, 2015 | GMC Cars & Trucks

1 Answer

A 1998 gmc Sierra driving down road at 60 and it just died replaced ignition module and in line fuel filter and now It won't even try's to start


Have you checked the fuel pressure? I think that the fuel pressure is between 55 or 60 pounds. They won't run under 52 pounds.

Mar 30, 2013 | Cars & Trucks

1 Answer

My 98 gmc 1500 V8 5.0l won't start. Has good spark


Spray starting fluid into the air intake of the engine, if it starts and you have fuel pressure you have no injection or injector pulse as we call it. Check ECM fuse one and two for continuity if it starts with fluid..

May 25, 2012 | 1998 GMC Sierra

1 Answer

Occasionally my 98 chevy P/U won't start. The fuel pump does not run. If I fool around with the Ignition switch I eventually get the fuel pump to run, then it will start and run fine.


The fuel pump only comes on for 2 seconds when the ignition switch is turned on until it starts.I would check the fuel pressure it should be 60-66 psi with key on engine off.Sounds like a weak fuel pump to me you'll know once you check the pressure.If its not within specs replace pump.

May 10, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

Will turn over but not start-need help quick


One easy thing is to tap on the bottom of the fuel tank while trying to start it.If it starts then you know it`s the fuel pump.The only other thing is to check the fuel pressure but you need a pressure tester.The other thing is to check and make sure you have power to the pump.This is the gray wire at the pump connector.Also make sure your ground is good.The specified pressure is 55-60 psi.Hope this helps.Good luck.

Dec 17, 2009 | 1999 GMC Jimmy

1 Answer

98 gmc jimmy would not start cold unless i spray starting fluid


THOSE VEHICLES HAVE A HIGH PRESSURE FUEL PUMP THAT WILL ONLY START IF IT REACHES 60 PSI OR MORE.. BUT ONCE IT IS RUNNING REQUIRES LESS PRESSURE.... MAKE SURE THE FUEL PRESSURE WHEN STARTING EXCEEDS 60 PSI OR IT WILL NOT START...

Jun 26, 2009 | 2000 Chevrolet S-10

2 Answers

98 gmc jimmy loses power to a stop


the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.

May 22, 2009 | 1998 GMC Jimmy

1 Answer

HOW TO REPAIR FUEL INJECTION FOR GMC YUKON 98


check for plugged fuel filter on the frame rail on driver side, blow through it to see if it is plugged. also have fuel pressure checked if it is below 60 psi replace fuel pump

May 08, 2009 | 1998 GMC Yukon

2 Answers

2002 gmc siera turns over and starts but dies immediatly


U NEED TO CK THE FUEL PRESSURE 55 TO 62 PSI.IT CAN LOOK LIKE U HAVE FUEL.IT MAY NOT BE ENOUGH.IF U HAVE LOW PRESSURE CK THE FUEL FILTER BEFORE U CHANGE THE PUMP

May 05, 2009 | 2002 GMC Sierra

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

440 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

60867 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

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

Answer questions

Manuals & User Guides

Loading...