fouled

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fouled - 3/6/2008 11:26:43 AM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline i havea 94 chevy vortex. i just changed the plugs last week was running fine. now its runing the same way it did b4 i changed them. my gas guage doest work so ive been going by mileage. i get 280 on a full tank. i ran out at 137 miles. i smell gas from the exhaust. the plugs where white on the drivers side and black on the pass.  ihave no clue i need help. Post #: 1

RE: fouled - 3/6/2008 12:22:45 PM    countryguy1713   Posts: 30 Joined: 2/5/2008 Status: offline I am having the same problem with mine. ive changed my fuel filter, plugs and wires, distributer cap and rotor, and it still fouls the plugs on the passenger side Somebody told me to check my fuel pressure, i havent got around to doing that yet but u might try doing that (in reply to eddiegreeny) Post #: 2

RE: fouled - 3/6/2008 12:49:34 PM    swartlkk Posts: 15304 Joined: 5/1/2005 From: Waterloo, NY Status: online I would start with a fuel pressure test, specifically the leak down after you have cycled the key on, waited for the pump to shut off, then turned the key off, watching the pressure.  If it drops, you have a fuel leak, mostlikely internal to the plenum and probably caused by a faulty fuel pressure regulator (FPR). _____________________________ Kyle- My Restoration Projects Please Do Not PM for Tech Help (in reply to eddiegreeny) Post #: 3

RE: fouled - 3/6/2008 7:27:44 PM    countryguy1713   Posts: 30 Joined: 2/5/2008 Status: offline Ok but what pressure guage do u watch or do u have to buy a fuel pressure guage? (in reply to swartlkk) Post #: 4

RE: fouled - 3/6/2008 7:32:05 PM    thegr81 Posts: 2639 Joined: 1/16/2007 From: PHOENIX,AZ Status: offline You have to get a fuel pressure gauge and check at the connections on the driver side of the motor near the firewall, PSI should be between 55-60 psi. _____________________________ 2001 2wd 4.3 vortec v6 "I'm not fat, I'm a minitrucker" (in reply to countryguy1713) Post #: 5

RE: fouled - 3/7/2008 8:06:09 AM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline has anyone ever changed the spider. i have 3 different people telling me things. spider cuz my  oil smells like gas, mass air flow sensor code came up at 33 showing low vacum. i had one mechanic tell that the fpr never goes bad,one telling me that they always do. stumped about to sell the damn thing. i paid 3400 for it and put in over a grand in it. (in reply to thegr81) Post #: 6

RE: fouled - 3/7/2008 10:18:42 AM    swartlkk Posts: 15304 Joined: 5/1/2005 From: Waterloo, NY Status: online Please take our advice.  CHECK YOUR FUEL PRESSURE!  No need to speculate without that vital information.  A fuel pressure gauge shouldn't cost you more than $30 at your favorite autoparts store.   If you either do not want to buy a pressure gauge or are unsure of how to go about testing it, ASK!  The other thing you can do, which is more labor intensive but will work, is to pull off the upper plenum and actually look for leaks.  I am suspecting that the passenger side of the lower plenum will have puddles of fuel.  This would be a result of a FPR failure.  If the driver's side has fuel contamination in it, then this is a sign of a leak in the 'nut kit' (internal fuel lines). And the mechanic that said that the FPRs never go bad has no clue.  MANY people here have replaced the CPI spider (check out Lindertech.com - their kit comes with the updated FPR and all gaskets) and many more have replaced the FPR.  If you remove the spider for any reason, you better plan on having a new 'nut kit' on hand to install.  These lines do not like to be removed and reassembled, quite often resulting in another fuel leak. _____________________________ Kyle- My Restoration Projects Please Do Not PM for Tech Help (in reply to eddiegreeny) Post #: 7

RE: fouled - 3/8/2008 11:51:20 AM    TrammelZ28   Posts: 1 Joined: 3/7/2008 Status: offline mine was doing the same thing, it turned out to be the FPR. i would def. try testing the fuel pressure before you sell it over a cheap part  (in reply to swartlkk) Post #: 8

RE: fouled - 3/9/2008 5:17:38 PM    countryguy1713   Posts: 30 Joined: 2/5/2008 Status: offline Is there any other way of getting ur fuel pressure tested besides buying a fuel pressure guage? and where is the FPR located at (in reply to TrammelZ28) Post #: 9

RE: fouled - 3/10/2008 3:54:23 AM    thegr81 Posts: 2639 Joined: 1/16/2007 From: PHOENIX,AZ Status: offline As far as testing your fuel pressure, buying or borrowing a tester is the only way to test it!! _____________________________ 2001 2wd 4.3 vortec v6 "I'm not fat, I'm a minitrucker" (in reply to countryguy1713) Post #: 10

RE: fouled - 3/10/2008 4:35:57 AM    swartlkk Posts: 15304 Joined: 5/1/2005 From: Waterloo, NY Status: online The fuel pressure regulator is located under the upper intake plenum.  Have a read through the link below and let us know if you have more questions: Fuel pressure regulator on Blazer 4.3L CPI W engine (incl'd EGR and IAC check/clean) And as Ryan said above, you have to get a fuel pressure gauge to test the pressure.  You should be able to pick one up for $20-$30.  Mine is/was an el-cheapo and has lasted me well over 6 years of use on various repairs. _____________________________ Kyle- My Restoration Projects Please Do Not PM for Tech Help (in reply to thegr81) Post #: 11

RE: fouled - 3/10/2008 9:03:15 AM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline i just went out to check my pressure and i notice that my needle is bent. would that have anything to  do with pumping to mych gas in it? (in reply to swartlkk) Post #: 12

RE: fouled - 3/10/2008 3:31:38 PM    rriddle3 Posts: 1555 Joined: 12/22/2006 From: Fort Worth,Texas Status: offline You mean you bought a fuel pressure gauage and the needle was bent on it when you bought it? What do you mean by 'pumping too much gas in it'? I'm afraid your post is a little confusing. _____________________________ 2002 Blazer LS 4dr 2WD Auto Trans Hypertech PP III Programmed Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip TYC Elegante carbon fiber tail lights (in reply to eddiegreeny) Post #: 13

RE: fouled - 3/10/2008 4:18:35 PM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline the schrader valve stem is bent. (in reply to rriddle3) Post #: 14

RE: fouled - 3/10/2008 6:43:30 PM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline i just checked my codes again they are flashing 12 and 34. any ideas (in reply to eddiegreeny) Post #: 15

RE: fouled - 3/11/2008 12:12:53 AM    thegr81 Posts: 2639 Joined: 1/16/2007 From: PHOENIX,AZ Status: offline The schrader valve stem on the fule lines is bent?? Is it bent to the point of not being able to check fuel pressure?? _____________________________ 2001 2wd 4.3 vortec v6 "I'm not fat, I'm a minitrucker" (in reply to eddiegreeny) Post #: 16

RE: fouled - 3/11/2008 6:40:29 AM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline yes it is.i tried to get both hands in there but no use. so i called the dealer i have to buy the whole rail. the  auto parts stores dont carry it. called a few local junk yards no blazers in the lots. will a schrader valve from  a different blazer that isnt 4.3 work? (in reply to thegr81) Post #: 17

RE: fouled - 3/11/2008 9:36:13 AM    swartlkk Posts: 15304 Joined: 5/1/2005 From: Waterloo, NY Status: online You should be able to pull the valve out with a regular tire valve extractor.  And yes, the valve from any other similar year GM vehicle should work, but get a few incase you damage the seal. _____________________________ Kyle- My Restoration Projects Please Do Not PM for Tech Help (in reply to eddiegreeny) Post #: 18

RE: fouled - 3/11/2008 5:58:43 PM    eddiegreeny   Posts: 10 Joined: 3/6/2008 Status: offline so i can change it like changing one on a tire then. do i need to take the schrader out at all. (in reply to swartlkk) Post #: 19

RE: fouled - 3/11/2008 6:35:22 PM    swartlkk Posts: 15304 Joined: 5/1/2005 From: Waterloo, NY Status: online The schrader is what you are in need of replacing is it not...?  If it is, then yes, you can remove it from a fuel rail just like removing it from a tire. _____________________________ Kyle- My Restoration Projects Please Do Not PM for Tech Help (in reply to eddiegreeny) Post #: 20

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