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Username Post: p0171 and p0174        (Topic#229578)
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-12-09 06:04 PM - Post#1804741    

i have a 1997 chevy k1500 with a 5.7 liter vortec in it i get the code p0171 and p0174 i changed all 3 of the o2 sensors and i got the code again i delete it and it comes back about 30 miles later when i first start the truck in the morning and tr to leave and hit the gas pedal it doesnt go anywere. i have changed o2 sensors, fuel filter, clean the maf sensor, changed the egr and put a new air filter in the truck. what else could it be?

 
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355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-12-09 07:28 PM - Post#1804798    
    In response to pwyller85

Well basically, over all you motor is running lean to a point that it is beyond the programmed limits and threw the code.

Reasons for this are:
-fuel delivery issues
(check, fuel pressure, maybe clogged fuel filter or bad pump or regulator, lastly dirty injectors, less likely though.)
-sensor reading fault. Since you replaced both o2 sensors and they both throw error then I would say the next could be a dirty MAF.

BTW, welcome to chevytalk.
98 Silverado k1500 4x4 350


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-13-09 03:02 AM - Post#1804916    
    In response to 355Cheyenne

thank you for the welcome

the maf i have cleaned it very good
fuel filter i have changed it
after i changed the o2s the truck has alot more power
i was thinking fuel injectors? or should i try the fuel pessure regulator?

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-13-09 06:47 AM - Post#1804964    
    In response to pwyller85

I would get a fuel pressure gauge on it, I bet you have low pressure, but that could be regulator or pump. Wen you cleaned the MAF, what did you use?
98 Silverado k1500 4x4 350


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-13-09 02:06 PM - Post#1805199    
    In response to 355Cheyenne

i was told to use brake cleaner to clean the maf i dont think there is a place for me to hook up to the fuel system to check the fuel pressure

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-13-09 02:22 PM - Post#1805208    
    In response to pwyller85

hmm. That was bad info. never use brake/parts or carb cleaner on MAF. They sell a MAF cleaner or electrical parts cleaner is O.K.

There is a place on the rail for a tester. I forget right now but there is.
98 Silverado k1500 4x4 350


 
rodram 
Contributor
Posts: 375

Loc: Saskatoon, CANADA
Reg: 04-14-09
11-13-09 02:24 PM - Post#1805210    
    In response to pwyller85

... you should use MAF cleaner to clean the MAF... comes in an aerosol can at your autoparts store

... check your fuel pressure anywhere between the filter and fuel rail (MINIMUM pressure should be 58psi ... normal range should be 61 to 66 psi)... if it is low then replace the fuel pump


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-13-09 02:53 PM - Post#1805221    
    In response to rodram

well thats crappy info thanks for all the help i will check the fuel pressure i will let you guys know what happens

 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-16-09 07:18 AM - Post#1806676    
    In response to pwyller85

i did find the nipple to check the fuel pressure now i am just waiting on the gauge i bought it seem like i have enough fuel pressure i think it is the regulator dur to the lack of fuel at the carb fuel pump sounds fine but i will check

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-16-09 08:08 AM - Post#1806705    
    In response to pwyller85

well just because the fuel pump "sounds fine" doesn't mean it is. I am not saying it isn't the regulator I am just saying don't rule the pump out because of sound alone. there is also a fuel filter that could be changed. This alone could fix your problem.
98 Silverado k1500 4x4 350


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-16-09 07:23 PM - Post#1807123    
    In response to 355Cheyenne

so i check the the fuel pressure and i have 50 psi with holding the idle higher it goes up maybe 2 psi at the most could it be the fuel pressure regulator?


 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-16-09 07:53 PM - Post#1807145    
    In response to pwyller85

O.K. so it is either the regulator or the pump. The first thing I would do, and you have to do it anyway, is to replace the fuel filter. after you do this see what your pressure is now. my perspective is, if there is no change, then likely the regulator. if there is an increase but not enough, hen you need a new pump.

Tom
98 Silverado k1500 4x4 350


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-16-09 08:18 PM - Post#1807172    
    In response to 355Cheyenne

that is the first thing i did the fuel filter has 300 miles on it

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-16-09 08:29 PM - Post#1807181    
    In response to pwyller85

O.K. well then at this point it is your call. you can go for the regulator first if you want. if that doesn't work then it has to be the pump.
98 Silverado k1500 4x4 350


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-16-09 08:34 PM - Post#1807185    
    In response to pwyller85

just so everyone know i replaced o2 sensors all 3 of them egr valve fuel filter i have cleaned the maf and have changed the air filter i am debating on what i should try next fuel regulator or fuel pump i was leaning toward regulator

 
wkobe 
Senior Member
Posts: 375

Reg: 02-04-04
11-17-09 05:27 AM - Post#1807296    
    In response to pwyller85

does a 97 have the crappy popit injectors? I changed everything on mine chasing problems and ended up having to change injectors to fix it did pump regulator and even changed an individual injector for the cylinder that was causing problems to no avail then changes whole spider and all better

wayne
wayne
1996 k1500 4.3 276k miles
1996 k2500 5.7 118k miles
1998 k2500 5.7 115k miles


 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
11-17-09 07:19 AM - Post#1807346    
    In response to wkobe

wayne,

yes, 96 to 98 are that poppet valve injection. but he has identified that his fuel pressure is WAY below operational, that needs to be addressed and will cause what he is experiencing.

as far as doing the pump or regulator. I would say that is up to you but it is more likely to be a failing pump then regulator but don't take my word on it because you will then do the pump and get pissed at me when it was the regulator...

Tom
98 Silverado k1500 4x4 350


Edited by 355Cheyenne on 11-17-09 07:20 AM. Reason for edit: No reason given.

 
rodram 
Contributor
Posts: 375

Loc: Saskatoon, CANADA
Reg: 04-14-09
11-17-09 08:04 AM - Post#1807369    
    In response to 355Cheyenne

... replace the fuel pump, if it cannot bring the fuel pressure up to 61-66 psi then it will not do the job for you and the injectors will not function properly

... if you still want to dither about regulator or pump, then check the fuel pressure in the fuel line at the fuel filter (i.e., before it gets to the regulator)


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-18-09 12:56 PM - Post#1808092    
    In response to rodram

thats the thing the point to test the fuel pressure is before the regulator i was ust thinking about that so its got to be the fuel pump do to the location of the spot to check the fuel pressure


 
evhfan2000 
"3rd Year" Gold Supporting Member
Posts: 1157
evhfan2000
Loc: Portland, OR.
Reg: 10-17-04
11-21-09 10:15 PM - Post#1810124    
    In response to pwyller85

I can't remember how many fuel pumps I have gone through since 1999. I think 4. Never once was my regulator an issue. Yes, the regulator is cheaper and easier to replace and MAYBE it will fix the problem. Odds are its the fuel pump.

Just my opinion.

Let us know how it turns out.
65 Impala Sport Coupe
99 CK2500 4x4 7.4L Crew
03 CK1500 4x4 5.3L Sub
02 CR250R


 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-21-09 11:43 PM - Post#1810162    
    In response to evhfan2000

update i just finihig putting the fuel pump in and i ahve the same fuel pressure 50 psi but when hit the gas it jumps up to around 60 i had pistion ones wire off motor rane the same heavy spark took cylinder 2 off and had no spark and motor ran the same please help thanks guys

 
pwyller85 
Forum Newbie
Posts: 48

Reg: 11-12-09
11-22-09 08:05 PM - Post#1810649    
    In response to pwyller85

so really fast how do i change the spider injector? and is there a way to test them to see if they are bad or not before changing them?

 
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