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99 gmc jimmy has no power or excelleration. i have replaced fuel pump , fuel filter, erg valve, map sensor, and mass air flow sensor. can you help me please.

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6ya6ya
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Posted on Jan 02, 2017

AutoDoc
  • 169 Answers

SOURCE: erg valve

The EGR valve is located next to the TPS connector. It has two bolts holding it in place. You will need to replace the gasket when you take it off.

Posted on Aug 31, 2008

  • 160 Answers

SOURCE: Does my '99 Volvo V-70 Turbo Have a MAP sensor?

yes it has a map sensor

Posted on Nov 11, 2008

  • 2 Answers

SOURCE: remove airbag 99 gmc jimmy

I actually just took mine out today on a 1998 Gmc Jimmy. Its kind of simple now that ive done it. There are four ten millimeter bolts holding the passenger module in. you will need to drop your glovebox down so it is upside down to see these. It is easier if you take it right off. just take a shop light and look at the bottom of the module you will see two silver bolts (the only two ten mm down there) take them out. Then if you look up underneath you will see another up at the top left. To get this out you can hand wrench it or you can use a mini impact with an ajustable extension. to get the next the easiest way I found was to take off the trim aroung your speedometer get in the drivers seat and there is another ten millimeter nut on the top right (right by the vent holes) take that out then you are unbolted. Without going into tons of details when you start doing it you will quickly realsie how to do it it just takes some patience. Dont forget to pull the fuse before you do anything its a 15 amp fuse second row 3rd up in the panel inside the car. Hope this helps

Posted on Mar 04, 2009

  • 36 Answers

SOURCE: mass air flow sensor replacement (variable valve timing)

The MAF is on the Air Intake above the air filter box and screwed into the plastic tube heading toward the throttle body.  It is the 2" by 2" plastic protrution from the air intake tube. There should be two philips screws holding this in.  Remove the two screws and back the entire MAF out.  There is a wire harness connected, unclip this to remove completely.
If you have money burning a hole in your pocket, go ahead and purchase another MAF for a few hundred clams, or you can spend about $10 and clean it.  It's made out of titanium and I doubt it will fail in 10 years.  But sometime it does happen.
Go to Lowes, or Home Depot and buy Electronic Cleaner in a spray can.  If you look inside the sensor, there is a heated wire, and behind that is another wire which picks up the oxidized air.
Stick the tube which is attached to the electronics cleaner spray can into the cavity where these wires are seen.  Continue to spray most of the can onto these wires to remove oxidation build up from the wires.  Let it evaporate for a few minutes then hit it again.
Allow the assembly to evaporate complete for about an hour.
In the mean time, take some throttle body cleaner and spray out the throttle body with the valve open.  Keep open to let it dry out quicker and clean up the black crud that come out.
Keep you air filter replaced.
Put everything back together and you should be good to go.
DIYr-X

Posted on Mar 16, 2009

rockitman187
  • 2559 Answers

SOURCE: Could the mass air flow sensor cause 98 Jimmy to

No not just the MAF

Posted on Jul 29, 2009

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99 Chevy Silverado 2500 was running fine last night..got gas last night but got it from the same gas station as always...thismorning idle was realy rough,shaking the whole truck...really struggling for...


Have you changed plugs and plug wires lately. Sounds like misfire, possible ! Should also check fuel pressure , plugged fuel filter or weak fuel pump ! Mass air flow sensor dirty, or map sensor .What engine do you have and does yours have How to replace the spider injector on Cheyv motor 4 3 or 5 7 liter

Jan 20, 2015 | 1999 Chevrolet Silverado 2500

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I have a 1999 gmc jimmy that will start and run fine for a few days then will turn over but not start for days


I wild have to work on this until I duplicated it, then check the vehicle while it was messing up. You could have one defective component even if you just replaced it. (Fuel pump, ignition module, crank sensor, etc.) You could have simply a bad coolant temp sensor, or maybe your mass air flow sensor causing problems. You could try unhooking your coolant temperature sensor and seeing if it wild start. This makes the pcm look at a default value. You can try the same thing with the mass air flow.Do you have access to a scanner when it is messing up? Have you checked for spark at the plugs? Have you checked your fuel pressure? Sorry, I would have to actually work on it.

Jun 28, 2014 | 1999 GMC Jimmy

1 Answer

Type p0171


It is a generic OBD2 power train Code. The same solution could be applied to all other vehicles as well.
Error Code: P0171
Description:
Fuel Trim (FT), System too Lean, Bank 1
Possible Causes:
- Fuel pump pressure too high or regulating valve stuck closed.
- Intake/ exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Fuel Injector(s).
- Evaporative emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
Solutions:
-Usually, simply cleaning the Mass air flow (MAF) sensor helps solve the problem.
- It is best to take MAF off and spray it with electronics cleaner or high flash point solvent.
- Inspect all vacuum and PCV hoses, replace if necessary.
- Check for a dirty fuel filter and proper fuel pressure.

Sep 26, 2013 | 2000 Toyota Corolla

1 Answer

Wants to die after letting off gas peddle


Did you change your Mass Air Flow Sensor? Your air filter? Idle Air Control Valve? This sounds like you are having an air issue. Meaning that your vehicle is not being aloud to breath properly.

Nov 12, 2011 | 1996 GMC Jimmy

2 Answers

Stuttering on acceleration and/or at highway speed


had same problem replace mass air flow sensor

Aug 09, 2009 | 1997 GMC Jimmy

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

2 Answers

I have a 1994 gmc safari.It seems to have a smooth idle at times


Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!

Mar 02, 2009 | 1994 GMC Safari

2 Answers

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It could be electric fuel pump stall. The pump isn't pumping fuel fast enough. This model may have a inline fuel filter before the fuel pump as well that might need replacing.

Dec 02, 2008 | 1999 GMC Sierra

2 Answers

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Have you replaced your O2 sensor? If not, try that.

Jun 27, 2008 | 1997 GMC Jimmy

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