Question about 1991 GMC S-15 Jimmy

1 Answer

LOW VOLTAGE ON A FEW WIRES WILL NOT RUN

I HAVE A 1991 GMC JIMMY 4.3 ENGINE I HAVE FOUND A FEW WIRES THAT HAVE LOW VOLTAGE ON THEM ONE IS THE ONE THAT GOES TO THE FUEL PUMP THE OTHER IS THE ONE THAT GOES TO THE MAP SENSOR THIS IS WITH THE INGNITION SWITCH IN THE ON POSITION, I TOOK LOOSE THE FUEL LINE FROM FUEL FILTER AND TURNED INGNITION SWITCH TO ON POSITION AND THE FUEL PUMP DID NOT PUMP ANY FUEL UNLESS I TUNED INGNITION SWICH TO CRANK POSITION THEN IT PUMPED FUEL.

Posted by on

  • JWOSBORNE Jan 10, 2009

    IT HARD TO START WHEN COLD AND WHEN IT DOES SOUNDS LIKE STARVING FOR GAS

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 36 Answers

Many wires on most autos will have low voltage around 5 volts is common for wires going to most sensors. What you described with the fuel pump sounds normal for this truck. I would guess the fuel pump is not your problem cant say for shore with out any more info. I am unclear as to what the symptoms are, is the truck not starting. What led you to check the fuel pump. Did you check for spark.

Posted on Jan 10, 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

Where is the fuel pump relay on a 1991 gmc jimmy


Thye fuelpump relay is located to the right of the brake booster. this is for a 1991 gmc jimmy (s-15)

I have enclosed a diagram to help locate the relay.

The most common reason for no fuel pressure on these trucks is not the relay but rather the fuelpump itself. the pump is located inside the fuel tank.

There is also a problem with the wiring to the fuel pump, you will need to locate the top of the tank and then off to side of tank is wiring .
This wiring comes off the top of the tank, you will need to check and there is connector problems..
there is one or two ground wires that come off wiring to top of tank which run to frame, check to make sure the grounds are good. if you end up with a bad pump you will see a notice to rewire a new fuelpump connector. hope this is helpful. good day.3_4_2012_1_29_16_am.gif

Mar 03, 2012 | 1991 GMC S-15 Jimmy

1 Answer

I have a 91 gmc jimmy 4wd and the vaccum line that goes on top of the engine block under the breather fell off and i cant find it now were and the jimmy shakes like everything is that what it could be and...


If it shakes try replacing the distributor cap, the pin in the center wears down and jumps causing eratic engine shake (get the genuine GM one it seems to be more precise and smoother running engine) also make sure your spark plug wires aren't broken, or breaking.

May 13, 2010 | 1991 GMC S-15 Jimmy

1 Answer

1995 jimmy has started to hesitate to start and progessively getting worse now won't start. would make noise now battery dead


Sounds to me like you need the alternator repaired,low voltage makes the engine work poorly and it will quit when the voltage gets low enough that all the sensors are out of range,by then you don't have enough power in the batteries for a restart.

Feb 03, 2010 | 1995 GMC Jimmy

2 Answers

Firing order for gmc jimmy 1999


-Drivers side starting at the front of engine: 1-3-5
-Passenger side starting at fornt of engine: 2-4-6
92850034.gif

May 20, 2009 | 1999 GMC Jimmy

1 Answer

1991 gmc jimmy over fueling at start up, it wont start unless you push the gas pedal then it runs rough if you let off it stalls. It is getting way to much fuel...


Sounds like the relay is not shutting off fuel pump. Turn the key to on position ( not start ), pump should only run for a few secounds and you will hear a click and pump should shut off, if it keeps running relay is bad. If it works like it should than fuel regulator (if there is one) would be the next posability.

Apr 08, 2009 | 1991 GMC S-15 Jimmy

2 Answers

JUST DONT WANT TO RUN


Check the fuel pump.

Jan 09, 2009 | 1991 GMC S-15 Jimmy

1 Answer

FEELS LIKE GETTING NO GAS


cHECK THE FUEL PRESSURE AT THE RAIL. iF LOW i WOULD CHECK THE INLINE FILTER AND THEN A POSSIBLE PUMP

Jan 09, 2009 | 1991 GMC S-15 Jimmy

2 Answers

Fuel pump


I do not know the codes but have been told "vacuum leak"? Mechanic thought gas cap might be loose or the O ring in cap may be dry-negative. Hope this may help some.

Nov 24, 2008 | 1996 GMC Jimmy

2 Answers

1994 jimmy fuel shutown @spider?


Hi

A very common failure on these is the CPFI unit , or SPIDER as people like to call it.

There is one single injector which feeds each cylinder via a pipe and poppet. The injector becomes blocked and the engine won't start or run.

Before you go condemning this though, just make sure you have good fuel pressure because the fuel pressure regulator or fuel pump could also have a hand in the problem. Make sure the pump is running, and if not then check the fuse, the relay, and the pump itself.

Very best regards

Geordie

Jun 18, 2008 | 1991 GMC S-15 Jimmy

Not finding what you are looking for?
1991 GMC S-15 Jimmy Logo

Related Topics:

159 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

70346 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

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

Answer questions

Manuals & User Guides

Loading...