Question about 2001 GMC Yukon

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Have a 2001 yukon 4wd 5.3

Has 80,000 miles on engine. Runs good. Seems to get decent mileage. Want to put 8 new spark plugs in and change the O2 sensors. Am I wasting my time and money

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Not at all and when changing your spark plug there is no reason not changing the spark plug wires too..

Posted on Jan 08, 2009

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Check engine light on; Gas milage went from 19 to 15, emission ba


YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.

Apr 20, 2010 | 1991 Mazda B-Series

1 Answer

We have replaced our 02 sensors twice initally it


Having owned and thoroughly enjoyed an 01 Durango SLT plus for 6 years, congrats on having the "D".

How many miles on your D? Aging O2 sensors can cause mileage to drop. Which engine do you have? The 4.7 or the 5.9?

You will pretty much find that 11-13 mpg in town is the norm, and 17 is normal for hwy cruising. Towing though in either case will have quite an effect.

Apr 20, 2010 | 2001 Dodge Durango

1 Answer

Hello. my 2000 4runner v6 has been running rough. when i start it, it runs fine untill it warms up. then it begins to miss. have replaced spark plugs, and battery but didn`t make a difference. diagnostic...


Change your oxygen sensors - they're responsible for feedback that the computer uses to determine the air/fuel mixture. They usually are good for about 60k miles and then start to go downhill. When they get to a point that the computer won't trust them, it ignores them and runs on preprogrammed fuel maps that run excessively rich (too much fuel) to safeguard the engine. You've probably seen a decrease in fuel mileage as well. And the O2 sensors have to be up around 900 degrees before they'll work - the car ignores them until then. That's why you run fine after a cold start but run rough once the car is warmed up.

The O2 sensors you want to change are in the exhaust system between the engine and catalytic converters (the "pre-cat" sensors). There are O2 sensors after the cats as well, but those are used comparatively to determine how well the cats are functioning. The primaries are the ones used for fuel mixture. If it's been this way for a few weeks or so, I'd put new spark plugs in as well - rich fuel conditions can foul them and contribute to the rough running.

Dec 09, 2009 | 2000 Toyota 4Runner

3 Answers

2002 ford focus is geting poor gas milage


Tune Time.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.

New oil and filter
8) new plug wires every 80000 miles.

Nov 07, 2009 | 2001 Ford Focus

2 Answers

2001 Isuzu Rodeo 4WD. CHeck Engine light on and


After market spark plugs could be the problem.
Reinstall the old plugs and see if that fixes it.
This vehicle has an ion sensing ignition system and is real sensitive to the proper spark plugs. I would get the proper plugs from the dealer if the old ones work.
The codes P1311 and P1312 are ion sensing codes.

Sep 23, 2009 | 2001 Isuzu Rodeo

1 Answer

2004 Dodge Intrepid Check Engine Light & Bad Fuel Mileage


If it has never had plugs changed, i would suggest it. It can make a big difference.

Labor time is .8 hrs + 6 plugs = $80 - $150.

Take your car to a parts place and they will usually check and clear your light for free.

Firestone likes to up-sell everything, $650 is way too much for a basic tune up.

Sep 19, 2009 | 2004 Dodge Intrepid

3 Answers

Poor gas mileage 2000 S10 4.3L 4WD


Thats the mass air flow meter.Should get changed at 60.000 miles. Also change the air filter.

Jun 18, 2009 | 2002 Chevrolet Blazer

1 Answer

2001 GMC Yukon 4wd 5.3


not wasting time and money at all.engine should last another 120,000 or so with good maintenance,as you show to be doing...shouldn't take long to do either!!!!

Jan 08, 2009 | 2001 GMC Yukon

1 Answer

2001 Chevy Venture 92K miles - code P0134


dunno bout rotating the engine to put those plugs in, but the O2 sensor is right in the way as your arm is stuffed up behind the engine (plugs have to be done from below at the back) so I wouldnt be shocked if you found a disconnected O2 sensor that was never reconnected, or a damaged wiring loom from rough contact with the mechanic's arm. Those plugs are very hard to change so go easy on the guy!

Jan 08, 2009 | 2003 Dodge Grand Caravan AWD

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