Question about 1995 GMC Sonoma

1 Answer

1997 GMC Suburban losing power hesitation

My 1997 Suburban 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. 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

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 150 Answers

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

Ad

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

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 1997 GMC Suburban. It is shaking and jerking when idling and also during normal driving. I changed fuel filter, spark plugs, wires, distributor, and air filter. Still have the same response. No...


Have you figured out the problem??? My suburban is still doing the same thing after I replaced the same parts, plus more! I'm about to replace the fuel pump. Here goes nothing...

Aug 05, 2011 | 1997 GMC Suburban

1 Answer

Car loses power above 60mph. it's a 1997 British Ford Fiesta LX, but it's not on the model list provided


Replace the fuel filter - but check the air filter isnt dirty and clogged up first... can only be fuel starvation or air starvation -

Jan 24, 2010 | 1997 Ford Escort

1 Answer

Chevy blazer 1998 4-wheel drive - losing power when it's hot (after about 100 miles) once it cools, everything is fine


First thing to check is the fuel pressure and volume. Sounds like a fuel pump (in the tank) problem, but also be sure to check the filter as they can clog on this model. Testing the pressure with a gauge is the only accurate way to know if I am right. Clogged filter will give normal pressure but it will come up slowly. You can probably rent or borrow a pressure gauge from a local auto parts store if you do not have one. There is a fitting on the fuel rail, so you do not have to open up the fuel line to test the pressure.

Dec 29, 2009 | 1997 Chevrolet Blazer

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

I have a mercedes 2.5 td when i step on the gas it loses power, i have changed fuel filter but no different


It can be faulty glow plugs (replace), clogged fuel injectors (fuel injector cleaner), warn distributor cap/wiring (check/replace), fuel pump circuit, also might be wrong ignition timing.
Please kindly let me know if you need more info
Good Luck

Feb 21, 2009 | 1997 Mercedes-Benz C-Class

2 Answers

My Nissan Pickup is losing power


If you take the vehicle to a local shop, you can get a mechanic to do a compression check on each one of your cyllinders. This will tell you if your engine is holding pressure. If that checks out, it would have to be a fuel problem, (injectors, pump, filter, or clogged line) or maybe spend the couple bucks, and buy yourself a new MAF (mass airflow sensor) it may be the problem, but if not, it always helps to change.

Jan 30, 2009 | 1984 Nissan Pickup

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?
1995 GMC Sonoma Logo

691 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76848 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

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

Answer questions

Manuals & User Guides

Loading...