Question about 1997 GMC Yukon

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My 97 yukon runs at a higher rpm and has vibration and hesation in engine around 2000 rpm and uses almost three times the fuel does not do it all the time

At about 2000 rpms my engine has a vibration feels like it is loosing fuel but it is using almost three times the fuel. it used just under a quarter tank to drive 36 miles. and after i drive at highway speeds for more than 15 min or so my transmition shifts into 2nd hard

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It could be a couple of different issues going on, first I would check to make sure the engine does not have any type of vacuum leak. I check my vehicles with carb cleaner from Wal-mart, the cheap stuff. But be careful! It is very flammable, with the engine running at a idle, spray it in short bursts around the intake and vacuum lines, if there is a leak the engine will either idle up or down. Also, have the computer scanned at your local parts store and see what codes come back. When was the last time it had a complete tuneup? Hope this helps.

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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SOURCE: Hesitation at higher speeds. Feels like

get a moto vac cleaning done on engine that will clean all injectors and test fuel pressure should cost 100 or a little more fuel savings will pay it back in no time moto- vac cleaning

Posted on Jun 22, 2009

larrymatthew
  • 318 Answers

SOURCE: My 2001 GMC Yukon 5.3l 4WD SUV is having (2)

Does the trany fluid smell burnt? Might want to have the trany flushed - torque converter too - and replace the filter in the trans. FYI you may know this but it is not recomended that overdrive be enabled when pulling a trailer - especially a heavily loaded one. Does your town have lots of hills - this is an added stain on the trany.

Posted on Nov 18, 2010

skychief2001
  • 21873 Answers

SOURCE: What's your problem? 2000 Yukon XL Yukon died while driving down the highway like it ran out of fuel. Had 1/4 tank. No fuel pressure.

You'll need to check the circuit from the fuel pump relay back to the pump. The computer grounds the relay.
If the pump is running the filter could be clogged.

Posted on Sep 25, 2012

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Need to take to a shop with a GM tech 2 or higher scan tool. These tools can actually display various sensor readings and voltages in real time and can be used while driving the car to recreate the issue. These are super expensive scan tools so most shops don't have them. Call around or bite the bullet and have a dealer do it. The money you spend on a correct diagnosis will be saved by not throwing random parts at it based on guess work.

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which engine.??? never post lacking engine ,here is why.
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Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
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the #1 reason for most cars to idle too low are:
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Very likely a low fuel pressure problem. Have you changed the fuel filter? Check the fuel pressure against vehicle spec's while running at idle and again at about 3000 RPM. Also check pressure with key on/engine off. If you lose pressure between idle and higher RPM's you probably have a weak fuel pump. Same goes for if you lose pressure after initial key on/engine off. You could also have a problem with a weak ignition coil, spark plug wires or spark plugs but not as likely.
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When I was building my 97 GSX, I ran into this same problem. I found that I had a bad vacuum leak. Of course, this was after I had done a tune up, changed the fuel pump, injectors, etc.

Let it warm up without driving. Set you idle a little higher by adjusting the idle screw on the throttle body to about 2500 or so. If it does the same while sitting then you can start checking for leaks. Acquire a can of starter fluid from your local auto store. Spray in different areas, short burst (DO NOT blanket the engine area) around the engine compartment, 1 at a time. If the idle changes then returns that is the rough area of the leak. Look around that area and see what it could be. Then you can start fixing the problem.

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