Question about 1997 GMC Suburban

1 Answer

1997 GMC Suburban loses power...hesitates

My 1997 Suburban with a 5.7 began to lose power so I checked the fuel filter which was clogged so I replaced. While at the parts store they had sale on plugs so I figured at 155000 I should and did replace. I also ran some seafoam through as well. The next day the truck perfect. I pulled a 20 ft enclosed trailer at 75 mph no prblem....for about 150 miles. All of the sudden it was like you threw out an anchor. I lost almost all my power adn the check engine light came on. It would run normal power up to about 1/8 - 1/4 throttle but after that it would just bog down and make popping sounds. I pulled over checked my fuel filter and fuel cap...both fine. I unhooked my battery for 5 mins and hooked back up...PROBLEM SOLVED!!! I made it another 50 miles until it happened again. Went through this the entire 400 mile round trip and everytime I unhooked the battery it would run normal and the check engine light would go off. Since then I have replaced the O2 sensors, had the catalytic converters and muffler checked. I cleaned the EGR and mass airflow sensors (with proper cleaners). Nothing changed. I forgot to mention that after I unhook and reconnect battery it would run 150 times better however not perfect. It would hesitate when first accellerating from stop and would not have full power if you put the accellerator pedal to the floor. Anyway, I swapped the mass airflow sensor from my dads 98 Chevy to see if that was a problem. His truck ran very poorly so he purchased a new one which fixed the problem which leads me to believe mine was bad. With his MAF on my truck it ran really well...I still had a hesitation, but this was the first time since this all started that I was able to achieve full power....for a few days till it went back to its normal behavior. By the way when the check engine light comes on the codes that show up are "bank 1 and bank 2 too lean". I have perfect fuel pressure and have replaced the cap and rotor as well. Any ideas?

Posted by on

  • 4 more comments 
  • bshimpin Feb 01, 2009


  • bshimpin Feb 01, 2009

    Thank you! I forgot to mention that I also checked visually for vaccuum leaks. Is there a better way?

  • bshimpin Feb 03, 2009

    Ok I may be confused. Does anyone know the proper fuel pressure psi? I was told 52psi but Ive been reading some forums that lead me to believe that it should be about 10psi higher?

  • Dustin May 11, 2010

    did you replace the plug wires while you were at it? Sometimes those can short out and cause all kinds of goofy problems with computers.

  • mike loshbough
    mike loshbough May 11, 2010

    next step listen for vacuum leak.and you might have to have your computer flashed

  • mike loshbough
    mike loshbough May 11, 2010

    what is the fuel pressure



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 55 Answers

Replace the egr valve

Posted on Sep 27, 2009


6 Suggested Answers

  • 2 Answers

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

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.
Good luck!

Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 97 Camry Rough cold idle, weak accelleration and noisy exhaust

Lots of times the idle air control valve gets stuck on these engines. You can try cleaning it. Remove the air intake hose from the throttle body. Start the engine and spray throttle plate cleaner through the hole in the bottom on the throttle body. This will run the cleaner through the idle air control valve. make sure to keep the RPM's at about 2000 to 2500 throughout this procedure. You may need to install a new idle air control valve if it continues to happen.

Posted on Feb 01, 2009

  • 1 Answer

SOURCE: My car keeps jerking while im accellerate. what is

check your engine and gearbox mounts

Posted on Oct 09, 2009

  • 5158 Answers

SOURCE: 84 Z31 Turbo - Rough idle and poor slow accelleration

I would suggest a few things ... first and the most important... check that you have the wires in the proper order on the distributer. next have the timing checked.


Posted on Dec 27, 2008

  • 1596 Answers

SOURCE: knocking noise in the engine.

Knocking Noise Is NOT a Good or Normal thing I will Not try and Diagnose it But I STRONGLY Suggest That You Stop By A Couple Service Shops For a EAR ON Check for this KNOCK and
I say A Couple Shops Meaning 3-4 So as to get The right Diagnosis

Posted on Jan 23, 2009

  • 150 Answers

SOURCE: 1997 GMC Suburban losing power hesitation

I just went through this with a ford at the shop we threw parts at this car for days. It turned out to be the PCM. You can have all the best fuel pressures plugs, and MAF input but if the computer isn't reading it properly it can't work properly. The batterybeing disconnected is resetting the PCM taking it out of limp mode thats why it runs ok for short bursts. Its probably over-heating.

Posted on Feb 01, 2009

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Rav4 1999 hesitates and loses power

possible the fuel pump is intermittently going bad. sometimes the fuel filters are getting clogged and this can be symptomatic. i would replace the fuel filters first and then the fuel pump.

Nov 05, 2013 | 1999 Toyota RAV4

1 Answer

My car is losing horse power. Could it be the idle ? Or timing belt?

could be clog catalytic con.check air filter,fuel filter.tune up.

Mar 08, 2013 | Cars & Trucks

1 Answer

1986 Cadillac loses power going up hills. Check engine light comes on. Also pedal hesitation when trying to excellerate up hills

have you looked up the codes? sounds like a clogged filter or bad fuel pump. Either way, have the check engine light looked at.

Nov 12, 2012 | Cars & Trucks

1 Answer

At 60 mph engine hesitates feels like loss of power possible vacuum issue not getting enough fuel 1996 gmc suburban 1500 series 5.7 350

possible clogged catalytic converter or muffler is the engine temp getting high.
change the fuel filter

Apr 28, 2011 | GMC Suburban Cars & Trucks

1 Answer

1997 surburban hesitates maintaining higher speeds The oxygen sensors have been replaced...whats next? The codes show rich fuel

A rich condition is hard to get. It usually means your air filter is clogged. Another cause could be a leaking fuel injector.

Dec 16, 2010 | 1997 GMC Suburban

1 Answer

98 Suburban: Loses electrical like a short robbing power to drive

Perhaps alternator is not charging the battery properly 
Test with a voltmeter - fully charged battery should read approx. 12.8 without engine running
With engine running should read 13.8-14.2 .
Check the sparkplug wires and make sure the sparkplus are tight 
also check the two basic and very common thinks for this problem.the fuel pump and fuel filter.
if the pump is clogged and filter is dity this can when ever the fuel gets clogged ,this would make the car stall out and lose power as soon as the engine stopped sucking the fuel due to the debris .
check out this.
thanks,please do rate the solution.thank you for using fixya.keep updated.

May 30, 2009 | 1998 GMC Suburban

2 Answers

Poor acceleration

when was the fuel filter changed last how many miles on truck i found plugged filters will hold the vehical back on hard acceleratoin may be worth checking

Apr 29, 2009 | 1995 GMC Suburban

1 Answer

97 gmc jimmy loseing fuel power

The first thing I would recommend is that you change your fuel filter and recheck your fuel pressure once you do that. If is persists I would check your fuel pressure regulator as well. A fuel pressure regulator for a 1997 GMC K2500 ran about $45.00 and a fuel filter runs about $7-10.00. That's a lot cheaper to go that route first than to have to spend $350.00 for a new (Lifetime Warrenty) fuel pump that comes with a new sock and sending unit.

Mar 29, 2009 | 1997 GMC Jimmy

1 Answer

1997 GMC Suburban losing power hesitation

I just went through this with a ford at the shop we threw parts at this car for days. It turned out to be the PCM. You can have all the best fuel pressures plugs, and MAF input but if the computer isn't reading it properly it can't work properly. The batterybeing disconnected is resetting the PCM taking it out of limp mode thats why it runs ok for short bursts. Its probably over-heating.

Feb 01, 2009 | 1995 GMC Sonoma

1 Answer

Losing power

Have you had the fuel pressure regulator checked? Also you might want to have the fuel pump relay checked.

Jun 20, 2008 | 1997 Pontiac Sunfire

Not finding what you are looking for?
Cars & Trucks Logo

1,140 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

78267 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

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

Answer questions

Manuals & User Guides