Thread: Fuel Issues...?

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  1. #1 Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    Hey guys. I think I am having issues with my L67's fuel system and cannot find the solution. At first, the engine would start spitting at around 4k when accelerating and I would loose power. What's strange is that the severity of the issue changes every time I drive the car, but during every drive the severity is usually consistent. No misfire codes. No check engine light even, but fuel economy is noticeably low. So far, I have replaced the fuel regulator because the pressure was bouncing around, most of the vacuum lines under the hood, cleaned the MAF, and cleaned the injectors. Fuel pressure seems good (~40-50 psi) at any RPM when the car is stationary. I have a new fuel filter to install but the old one is rusted to the line fitting pretty well. Other than that, does anyone have any ideas about what the issue could be?
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  2. #2 Re: Fuel Issues...? 
    GTX Level Member QUICKSILVER462's Avatar
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    Put that new fuel filter on ASAP, and see if that helps the problem.
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  3. #3 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    *UPDATE*
    The new fuel filter has been installed and the issue has not been resolved. Idk what to do next. Maybe the injectors are failing???
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  4. #4 Re: Fuel Issues...? 
    I live here. ericspecullaas's Avatar
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    what is your fuel pressure at? also have you tried the trick with the fuel pump relay to make it run fast?
    im a cookie again yay me
    Quote Originally Posted by Bio248 View Post
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  5. #5 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    What's the trick? Pressure sits around 42psi idle and fluctuates between 50-60 under load. Under heavy load when it starts spitting, it rapidly bounces between 50 and 60 psi. Needle bounces 1-2 psi at idle but levels out as RPMs go up. Also, the MAF and MAP seem to read fine.
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  6. #6 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    Someone mentioned to me that it could be the crank position sensor. There aren't any codes for it, but any thoughts?
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  7. #7 Re: Fuel Issues...? 
    I live here. ericspecullaas's Avatar
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    the crank wont throw any codes the only way you will know is if your tac bounces when you crank it. but since it fires im guessing its fine
    im a cookie again yay me
    Quote Originally Posted by Bio248 View Post
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    Quote Originally Posted by Kilroy View Post
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  8. #8 Re: Fuel Issues...? 
    GTP Level Member 231FUN's Avatar
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    Quote Originally Posted by ericspecullaas View Post
    what is your fuel pressure at? also have you tried the trick with the fuel pump relay to make it run fast?
    fuel pump relay thing only applies to 97-00 gtp
    Crank sensor bad is usually a stalling issue, possibly a clogged converter if it's losing power at that rpm
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  9. #9 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    The power is down only when it starts missing, causing a jerking feeling. Wouldn't the cat cause more of a constant power reduction?
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  10. #10 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    Here is a video of how it's acting. See what you guys think.

    https://drive.google.com/open?id=0B9...y1wN3lWU1RYdkE
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  11. #11 Re: Fuel Issues...? 
    Donating Users Bronco Boy's Avatar
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    Quote Originally Posted by ericspecullaas View Post
    the crank wont throw any codes....
    P0336, Crankshaft Position Sensor Range/Performance. Both the CEL and TRAC OFF were lit up. BTDT. LOL
    Chris B
    2009 CX-9
    ** SOLD ** 2002 GT
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  12. #12 Re: Fuel Issues...? 
    Killa Bee Scottydoggs's Avatar
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    tune up time?


    if you have a crank code, change it then. it is rare when they do pop up.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #13 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    So with the way it acts, is it likely the crank position sensor? How would I even test that?
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  14. #14 Re: Fuel Issues...? 
    Donating Users Bronco Boy's Avatar
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    Quote Originally Posted by GP40TH View Post
    So with the way it acts, is it likely the crank position sensor? How would I even test that?
    Mine didn't act like your video, so my thought is it isn't CPS related.
    Chris B
    2009 CX-9
    ** SOLD ** 2002 GT
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  15. #15 Re: Fuel Issues...? 
    Killa Bee Scottydoggs's Avatar
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    ill ask again, last known tune up? what mines you at now?

    crank sensors make the car stall out. not misfire

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #16 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    Plugs and wires were done around 40k ago. Fuel filter was just done and the injectors were just cleaned. Just replaced my 3 year old cone filter. Lower intake gaskets were done about 25k ago and everything was cleaned.
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  17. #17 Re: Fuel Issues...? 
    Killa Bee Scottydoggs's Avatar
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    what plugs you install?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  18. #18 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    I think they were Bosch Iridium plugs. There are 188k miles on the car now.
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  19. #19 Re: Fuel Issues...? 
    Killa Bee Scottydoggs's Avatar
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    it could be the plugs are just getting old, or the cat is clogged up. maybe pull the up stream o2 sensor and see if it runs better, your making a good exhaust leak pre cat.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  20. #20 Re: Fuel Issues...? 
    SE Level Member GP40TH's Avatar
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    Okay, I fixed the issue! I pulled the plugs just to see how they looked, and they were fine, but I replaced them anyway. Also pulled the upstream O2 sensor as Scottydoggs suggested and it ran great! Put the old O2 in just to see if the plugs fixed it and the issue came back. THEN I bought a new O2 sensor and threw that in. Boom, problem solved. In addition, the MAF decided to also take a **** today, so that could have also been contributing to the issues I was having. All is well now though. Thanks for all the help everyone.
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