Question about 1999 GMC Suburban

1 Answer

Looses Power when on long trip pulling camper or trailer flagging oxygen Sensors error

I have a 99 GMC Suburban c1500 5.7 and last June it had a problem on a long trip while pulling a trailer in which it would begin to loose power and would not accelerate. I took it too the shop and they said it was the Oxygen Sensors Bank one and two and that my Catylitic converters needed to be replaced and then replace the Oxygen Sensors, it seemed to fix the problem for a while, now less than a year later I have the same code and problem. Drives fine around town, just when taking long trips and sometimes pulling a trailer, any help would be appreciated, thanks

Posted by on

  • davertipton May 20, 2009

    Thanks for the reply, I didn't mention that I just did a full tune up, (Oil, plugs/wires, filters (gas filter as well) ). And it runs great around town with great pickup and smooth running engine. This only seems to happen when I get down the road pulling a trailer and start to hit some up hill areas???

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Sniper:

    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 57 Answers

Sounds like a fuel problem. Change the filter and have the fuel pressure checked. A fuel problem can cause an O2 code.

Posted on May 19, 2009

  • Bennie Kennedy May 20, 2009

    Just for kicks, check the engen temp., and coolant level. over heating can cause power loss. If the rad is stopped up it may run cool in town but hotter on the road and under load causing a loss of power. Let the temp. get to normal and feel the tanks on the rad. from top to bottom. they should be the same temp. If the top fo the tank is hot and the bottom is cooler, sludge has setteled in the rad. and you only have 50% cooling.

×

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

008 FORD RANGER 4LY V6 GIVING AN ERROR LEAN N RICH ON BANK 1 AND 2 O2 SENSORS. HAD SENSORS REPLACED HOWEVER THE VEHICLE JUST LOOSES POWER AND REGAINS IT ON ITS OWN OR IF YOU SWITCH OFF N ON . REPLACED...


oxygen sensors are not the one who controls your speed however it will monitors your engine how it runs or if thre should be a looses power .if the sensors bank 1 and bank2 received a rich or lean mixtures..it is indicated that you need to check the spark plugs, fuel filter
fuel pump, or the vacuum hoses air flow meter, map sensors,fuel injectors which are need to check to fix the problem...

Sep 06, 2013 | 1996 Ford Explorer

1 Answer

Suburban loses power an hour after driving while towing


Too much negative weight causes your tires to loose grip.

Jul 10, 2017 | 1999 Chevrolet Suburban

2 Answers

99 suburban runs rough throughout driving range little bit of backfire wants to die but rumbles on.


Any Service Engine light? If so, the first thing that should be done is to get whatever codes are stored. Most part stores will hook up a generic code reader for free.
Last time plugs, wires, fuel filter, etc. was done?

Nov 02, 2011 | 1999 GMC Suburban

1 Answer

Hi I have a 1999 gmc suburban 454. It runs great by it self (like a bat out of hell). when I pull my 3,000lb boat It has no power. truck feels like a 350 that is loosing its power trying to climb a...


I just had a similar problem, my 99 burb would lack power, almost like someone took its breath away. I put in a new mass airflow sensor and it runs like its brand new. pulled my 30 ft camper 500 miles with all the power I needed

Aug 17, 2011 | 1999 GMC Suburban

1 Answer

I have a 1988 GMC 3500 truck, all the lights and the radio stopped working when I hitched up my horse trailer. Same trailer works fine on my 99 dodge, same pulg to trailer. What happened?


You blew a fuse. Check the in cab and engine compartment fuse box and replace burnt fuses. It's possible that you have too many lights on the trailer. This would cause a multiple amp draw on the truck pulling more power than the typical 10-25amp fuse supplied for trailers.

Jan 03, 2011 | 1988 GMC C1500

1 Answer

Suburban low pressure from fuel pump


Try checking the fuel filter and then the pressure regulator on the rail. If the pressure regulator is bad it will not let the pump push enough pressure. And if the filter is clogged then it will also not let the engine get enought pressure. I have seen pumps starter going out by losing pressure. I have also seen aftermarket pumps quit after about a week unles you did not change the whole assembly.

Sep 27, 2009 | 1999 Chevrolet Suburban

1 Answer

1990 GMC Suburban Wiring


check for adiquate ground at trailer plug in an make sure the problems not on the trailer it self does it go away when trailer is unpluged also try ground in the taillight buckets grounds an corroded conecctor are usaly at falt

Sep 17, 2008 | 1990 GMC Suburban

Not finding what you are looking for?
1999 GMC Suburban Logo

356 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75807 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22133 Answers

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

Answer questions

Manuals & User Guides

Loading...