Thread: L26 Mechanical Throttle Body

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  1. #1 L26 Mechanical Throttle Body 
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    Hello All, I am wondering if anyone has any information on converting the electrical throttle body in an 08 grand prix to a mechanical throttle body found on earlier versions of the engine, and if it can be done properly at all without screwing up the ECM/PCM?
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  2. #2 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    if you have a 08, it has to stay dbw. probably not worth the trouble if it can even be done.

    are you having a problem with the dbw TB or gas pedal?

    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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  3. #3 Re: L26 Mechanical Throttle Body 
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    First issue is CAN based PCM that no one but Overkill has attempted to tune. Your best hope is to contact him and hope he wants to help you.
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  4. #4 Re: L26 Mechanical Throttle Body 
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    Well it's become VERY unresponsive to the pedal between 1000 - 2200 rpms. Anything above, and she purrs like a kitten, and it idles perfectly. But in that range, it's become very laggy and performs like crap, it's almost impossible to hold a steady speed in that RPM range.
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  5. #5 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    is the check engine light on?

    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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  6. #6 Re: L26 Mechanical Throttle Body 
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    No Check engine light at all, or pending codes or anything. I have an ABS light and a no T/C light due to a bad ABS harness, but I know that isn't causing anything. I recently changed the Plugs, Wires, All three Coil packs, and the Ignition Control Module. She's got a clean air filter, and I cleaned the MAF and TB already this year. I wanted to include a fuel filter in there, but it's non serviceable.
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  7. #7 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    could be a tps going bad or a the pedal its self is on its way out.

    does it do this when driving only? or will it not hold steady rpm's in park if you were to try and hold it at say 2,000 rpm?

    what plugs did you use also?

    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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  8. #8 Re: L26 Mechanical Throttle Body 
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    OEM Delco Plugs.
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  9. #9 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    iridium ? i hope.

    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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  10. #10 Re: L26 Mechanical Throttle Body 
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    Yes they were. I'm still lost on this problem though.
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  11. #11 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    id check the fuel pressure at the rail. maybe a bad fuel pressure regulator? or the pump is going bad.

    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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  12. #12 Re: L26 Mechanical Throttle Body 
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    Did you pull the tb of to clean it
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  13. #13 Re: L26 Mechanical Throttle Body 
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    Fuel Pressure check might be a good start, I'll use the Pressure tester we have at work to take a look at that tomorrow, and yeah, I pulled the TB off, but this was a few months ago.
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  14. #14 Re: L26 Mechanical Throttle Body 
    Killa Bee Scottydoggs's Avatar
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    if the hose on the tester is long enough, drive the car with it hooked up, see if your dropping pressure while driving.

    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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