TPI HELP

[George M. Dailey]

I agree that soaking the TB is the better solution, but I was able to clean
mine without disconnecting/disassembling the front of the plenum, and in
less than 10 minutes. According to GM, it's the carbon build up at the point
where the air valve contacts the TB, that causes problems. This can be
reached with the old Fruit-of-the-looms. I have never had one back fire
using my quick and dirty technique. What about the rest of you all?  Call me
George, Please.  I'm already starting to bald at age 31, so don't make me
feel any older.
 
GMD
>
>At 09:03 AM 2/28/97 -0600, you wrote:
>>Actually, a better idea is to remove the throttle body and soak it in 
>>carburetor cleaner.  If you have a MAF, the procedure mentioned by mr 
>>Dailey becomes impractical.  The first time you restart the vehicle 
>>after cleaning the throttle body/plenum, I recommend you do so with 
>>the MAF out of the system, as the engine is prone to backfire at this 
>>juncture, which could damage the MAF.  Don't worry about the error 
>>codes until everything is hooked up after having started the engine 
>>and cleared the intake.
>>
>>
>>
>>
>>----------
>>From:  George M. Dailey[SMTP:gmd at tecinfo.com]
>>Sent:  Thursday, February 27, 1997 7:35 PM
>>To:  diy_efi at coulomb.eng.ohio-state.edu
>>Subject:  Re: TPI HELP
>>
>>Peter jogged my memory. The dry manifold design of the TPI has a 
>>tendecy to
>>form carbon on and around the throttle body air valve. Grab an old 
>>pair of
>>underwear soaked with carb cleaner, wrapped around your finger, and 
>>'goose'
>>the TB. This will remove some of the carbon build up. Try this before
>>fooling with the sensors.  Carb cleaner can be sprayed in the IAC 
>>valve
>>inlet port (with motor running) to clean it.
>>
>>Keep hope alive!
>>GMD
>>
>>At 08:28 AM 2/26/97 -0800, you wrote:
>>>Hi Vance
>>>
>>>If you mounted a fuel pressure guage on the cowel and it read 40 psi
>>>when braking hard I guess you could rule out fuel pump or pickup
>>>probs. Otherwise check those out. A fuel pump putting out a static
>>>40 psi often fails otherwise.
>>>
>>>Check the IAC passages and throttle passages for carbon buildup.
>>>Your iac count should be around 10 to 40 at hot idle.
>>>If it is high suspect carbon buildup.
>>>In a pinch crank up the idle speed to 800 or so with the min air.
>>>This will set the iac count to zero but it should run better
>>>
>>>Also check your fuel filter. Also check pump delievery by noting
>>>the volume delievered by the bypass line.
>>>
>>>Dats about all I can dream up Vance.
>>>
>>>GL:peter
>>>
>>>
>>>
>>
>>
>>
>>
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