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Chevy Truck bad mileage Engine Code P171
Hey ya'll, hope your all havin a great New Year! I will give you a fast run down of events and ask for any information you all can give me.
1999 Silverado, 4.8 vortec 8 cyl ext Cab 4wd. 190K.
New Tranny and I would like to keep her a few more years.
I used to get 18-19 highway. Things never changed: PCV )which I have but cant find right now)valve,02 sensors,MAF sensor cat convert. Truck runs great, no noticable faults with power- pick up or idle.
OK
Nov, I checked everything over and changed fluids, cleaned air filter etc. I went to deer camp and parked truck for days on end. After deer season I noticed my MPG dropped to 15-16. About Dec.15 I gets a service engine light on, I read the code and its a p171 (I think,regaurdless I know it was a ) Lean fuel condition bank 1), I clear it out. A week later I get 2 codes bank on. Lean fuel condition bank 1 and bank 2. Light goes out later. Around the end of Dec. it warms enough for me to work on truck, I decide to replace a few things (not that they need it, I just wanted to spend money and thro it out the window) My plugs were a big dollar plug along with a big dollar wire. I left the wires and changed the hotter burning plug I had in there (bosh 4 prongers) to a real close OEM plug. I changed oil and filter and fuel filter. I then hit the jack pot (or thought I did anyway) When changing the air filter, it was filled with weed material from a mouse nest formed. The box was completely filled as thick as you could imagine!!! (buisy little basturds during deer season when my truck was parked for a week). I think I found it right? I cleard the service light and for three weeks, it never came on. This week the temperature fell AGAIN back to below zero and my light came back on! Bank 1 lean fuel condition! Also, I never!!! checked fuel usage right after I had found the nest and changed plugs. Now I check fuel (a real good test, drove my son back to college Sat,600 miles in -2 deg weather) I got 13 MPG. AND 13.4PG AND 14.12 MPG !!!!
Thats the info. I was thinking about changing the 0/2 sensers (the front 2, not the back ones). and then maybe the MAF BUT the sensors are $65 eah and the MAF is $150!!!
Any sugestions? Maybe a trip to the dealer would be cheaper????? Any help at all would be apreciated!!!
Tahnk you all very much!
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Chevy Truck bad mileage Engine Code P171
I have alot of land 312 miles away from my house. I drive it regularily. I will fill up and zero my milage trip counter. Fill up again at around 256 miles (Osseo,Wi.) I would usually be between 13.5 gallons and 15 gallons at the re-fill up. That equals 17.0 to 18.9 mpg. I dont cheat the pump on both ends when checking milage cause it dont take much to throw a fictitious number back at you. Since my fuel gauge broke about 3 years ago, I have to zero out my trip meter every time!!!! I fill, and... I ALWAYS, fill up all the way 100 percent of the time. I have never ran out of fuel because, I know how to figure gas milage. (BTW) I will name fuels, Mobil gas gives me the best MPG. PERIOD. I can use Kwip trip and get good milage but I can also use the four finger corner station and about all the time I will be at the lower end of my average but never more than 1.5 less per gallon. This brings me back to my Service engine soon light (which came back on today). I think Im gunna bring her in. The buck and a half I spend guessing can go toward fixing it I guess. Just thought some one may have had the same experiance.
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Chevy Truck bad mileage Engine Code P171
1hillbilly
Glad I have a 1999 then! BTW, my truck is stripped except for Air. I dint even have carpet, just a rubber floor. Maybe all those spendy electric features that come on most trucks use more fuel??? Try driving with out the air conditioniong on and then check it?
EW
How much was that smelly fuel U use last time U filled up??? If I had to pull my work tools behind me everyday, I would spend 10K more for a stink truck too. With the price of that shit now a day, Im glad I still have a gas truck
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Chevy Truck bad mileage Engine Code P171
Chief
This was my first choice and it also was the first thing the guy at autozone said he thought the code could be . (Not that I put that much into the auto zone guy) but he see's alot of codes I believe. Then I thought there should of been a 02 code shouldnt there????? The 02 sensers are only around 60 bucks. Supose I could change the front ones? I never changed em? Maybe I will when the weather breaks here in a couple of days (too damm cold still) Although my codes have not come on again since the weather got above freezing again? This also wonders me? The codes started coming on when the temps dropped below freezing in Dec. Although the gas milage has been crappy since Nov.
Whats the weather by you like this week?
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Chevy Truck bad mileage Engine Code P171
New information about this problem which may help eliminate some possibilities. It is now -2 degrees again out and all of a sudden the service engine soon light comes on again. It has not came on since the last real cold streak we had. My fuel economy is always bad but the light varies. It went off for over 2 weeks, maybe a bit more.
I have a question maybe some may know. Is there a heater for the o2 sensor? I thought I read something about this but maybe it was relating to a totally different item? Was wondering if there is a problem with a 02 heater (if one exists) if this is why when it get real cold, I then get a light? I am leaning towards biting the bullet and replacing the 02 sensors.
EW
I sure am glad I waited before buying a skidsteer. I still wont absolutely need it for anouther 1.5 years BUT wait till you see what may be coming out! I think it will fit my bill perfectly.
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Chevy Truck bad mileage Engine Code P171
EW
Sorry, I shoulda kept quite, (no) and it may never make it out of Product Developement. Sites have been watched before for just such (exposed)info,{I can get in big doo doo} I must so I claim the fifth and must decline from further comment. Although I will talk to you as soon as I can either way. [Not that Earth Shattering anyways]for someone in the earth moving buisness but for the home owner it would be nice.
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Chevy Truck bad mileage Engine Code P171
WhooHoo!!
The latest and greatest! (Also the stupid boy in me)
I had enough so I decided to fix the damm problem. I had it narrowed down to the 02 sensers or the mass air flow senser. I actually figured it was the mass air flow but here is my story. Everything I read say's 02 senser's should be chganged at 100K, I know darn well that if I change the MAF and it cures my MPG problem along with the SES light, I will never change em SO, I decided to change all three at the same time! (Stupid) I know. Well I get half way down my dead end road and the SES light goes out! (This is looking good) I fill up 4 days ago. I drive 220 miles and use 12.56 gallons. Ahemm, that makes like 17.5mpg!!!! (Ahhh, the crowd goes nuts again) WhooHoo! I think I will keep my truck for another 190K miles!
So The bottom line here is that I changed the (2) two front 02 sensors and the MAF sensor. I had a SES light that coded lean air/fuel mix and I had milage per gallon drop from 17-19 down to 12-13mpg. My fix was to change the three items mentioned! Two hundred twenty bucks and I am back on track. Thanks to all who chimed in and gave my their opinions, I took my time and gave it alot of thought and waited for the weather and this alowed me to do the fix myself and save bucks! Thanks!!!
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