Thread: lean condition...

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  1. #1 lean condition... 
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    Hey guys my 98boost gtp is acting up. Im getting p0171 lean bank 1. My power is way down and my mpg is about 14.5. I have replaced plugs, wires, coils, maf, fuel filter, vac lines, head gaskets and all gaskets leading to heads. Fuel pressure test reveals 48 but the needle fluctuates very rapidly between 46-50. O2 sensors seem to be working. However my map is 9.7 steady at idle according to the scanner. I have checked fuel lines and cannot find any leaks. Also replaced injector orings. Pulled vac hose off pressure regulator and it was completly dry. Kinda at a loss. Thinking pump or clogged injectors. Although a map of 9.7in/hg seems low at idle. Any help would be greatly appreciated, thanks
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  2. #2 Re: lean condition... 
    GTP Level Member BlackGT97's Avatar
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    clogged Fuel filter? I'd change that before anything.
    1997 Grand prix GT Black Coupe- The beater
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    2008 Grand prix Midnight blue- The slow but nice car
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  3. #3 Re: lean condition... 
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    Yes already swapped the fuel filter
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  4. #4 Re: lean condition... 
    The Blue One blueguy's Avatar
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    9.7 is low.

    Have you read the fuel trims?

    What do they say at idle after it's gone into closed loop?

    Still sounds like a vac leak to me.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  5. #5 Re: lean condition... 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    EGR tube may be cracked and causing the vac leak.

    SMGPFC Member #1
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  6. #6 Re: lean condition... 
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    Stft is about 614 at idle ltft is around 14 at idle. Egr tube i have not checked. I checked the egr valve which was good. What is the best way to check the tube? Remove it? If 9.7 map is low then there has to be a vac leak somewhere? Should i smoke test?
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  7. #7 Re: lean condition... 
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    Also i am getting the lean code for bank 11 not bank 2. Dont know if that helps. Thanks again for your responses
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  8. #8 Re: lean condition... 
    The Blue One blueguy's Avatar
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    It's a vac leak.

    Spray carb cleaner around it.

    When the idle jumps, you found the leak.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  9. #9 Re: lean condition... 
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    Ive drenched lim sc gaskets and all lines which are new. Should i spray the egr tube?
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  10. #10 Re: lean condition... 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    spray it or take it off and inspect it, its possible its cracked.

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  11. #11 Re: lean condition... 
    Turbo is the way to go. BillBoost37's Avatar
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    Hook a piece of vacuum hose to the map. Pull your scanner screen up and watch map as you suck and blow on the tube. It should move. If not..your map or the wiring to it is bad.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  12. #12 Re: lean condition... 
    I live here. SlowNA06's Avatar
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    Common issue for lean code: Rubber T off LIM slipped off/dry rotted.
    Irridium spark plugs last 100k mi and work just as well as copper. Copper is a waste on N/A and only lasts 15k mi. Don't use Platinum.
    Use 195* tstat unless you can thoroughly explain why not; 99.9% don't need a lower temp.
    Almost any oil filter, ever, is of higher quality than ACDelco. Spend $6+.
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  13. #13 Re: lean condition... 
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    Thank you all for your responses! I have replaced all vac lines including the T on the lim under the sc snout. Map is a steady 9.7 at idle. I am going to check the map and egr tube. I also have smoke that comes from the area nelow the egr after the car heats up. I always attributed the smoke to an oil leak i have but now that i think about it the smoke smells and looks more like exhaust smoke than burning oil. This leads me to think the egr may in fact be cracked. I am going to investigate some more romorrow but everyones suggestions have neen great! Keep them coming and i will continue updating while trying to solve this problem because it really is crippling my performance and my wallet given the price of 93you octane!
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  14. #14 Re: lean condition... 
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    Just an update i scanned the car and here are some results:
    Map: at idle between 8.7 and 9.8hg at 2000rpm right about 8.0hg
    Maf: .52 lb/m. At 2000you rpm 1.4lb/m
    coolant temp 207
    Iat 118
    Ign advance 22.0 at idle 30.5 at 2000rpm
    Stft% -1.2 to. 8 at idle -.8 to 2.3 at 2000rpm
    Ltft% 10.9 at idle 7.0 to 8.3 at 2000rpm very odd never seen them this low
    Absolute tps% 3.9 at 2000rpm
    02s11 .1-.8v at idle. 1-.8 at 2000rpm
    Stft11% -3.8 toto 3.4 at idle-4.6 to 7.3
    O2s12 .14 to. 618 at idle slow smoothe rising and falling. .160 at 2000rpm
    All tests were done in park. Have never seen the ltft so low.
    Had several dtc's: p0171 bank1 too lean intermittent. P0741 tcc solenoid. P1646 boost control solenoid. P1811 max adaptive long shift.
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  15. #15 Re: lean condition... 
    I live here. ericspecullaas's Avatar
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    Sounds like what mine was doing. Im in the middle of finding a new engine. But I bought mine as a "fixer upper" the head was also leaking on both sides. But I wish you the best of luck!
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  16. #16 Re: lean condition... 
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    Do you have the tranny codes as well? I believe the lean condition is related to the egr... i just did the heads as well. The tranny codes are from a bad tcc solenoid and a need for a shift kit haha
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  17. #17 Re: lean condition... 
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    Just an update... i did what bill suggested and tested the map and it seems to be working. I scanned again and the ltft was 16.4. At idle but goes down when throttled. The code is also intermittent and only in bank 1. Im really stumped guys the egr seems fine but map is now 10that in/hg. Im really stuck performance and mpg are terrible
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  18. #18 Re: lean condition... 
    GT Level Member putskijr's Avatar
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    I'm having the same issues you are right, been working on my car all weekend and just want the damn thing to run right, ltft are at 16.4 at idle. I replaced the lower intake manifold gasket today and some vac fittings that were dry rotted. I got it to idle smooth but I took it out for a test drive and it still wont pull over 4000rpm. Any pointers are greatly appreciated!
    180* tstat, homemade FWI, autolite 605's, tuned by FoSho99, clear corners, 6000k hids, painted interior, and sum more
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  19. #19 Re: lean condition... 
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    Any idea what your map reading is?
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  20. #20 Re: lean condition... 
    Turbo is the way to go. BillBoost37's Avatar
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    Ok.. have you seearched on my name and P0171 yet? If not.. I'd suggest it. Lot's of good info on that code.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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