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10-30-2013
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#111 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: Throttle hesitation diagnostics?
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Vacuum to tranny COULD interfere with FPR's response to vacuum - right? BUT... There's no vacuum connections to the tranny (that I know of) - it's got a dedicated electronic controller. Even the hammer down downshift is electronic. Besides - the 'hesitation' was noticeable in, or OUT of gear... Thoughts????????????????????????????? |
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10-30-2013
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#112 | |
 Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,786
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Re: Throttle hesitation diagnostics?
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your calibration in software assumes the stock flywheel weight and maybe less drag right off idle. basically the light load fueling table and enrichment part could use some more fuel to see if it helps. Just thinking out loud, but this happens all the time with big carbs on automatic hot rods. You converting to automatic made me think of this. Also I have a friend who put a cam etc in a TPI car (auto) and has the same problem. this is also a speed-density car so I'm guessing enrichment is needed. Last edited by mike100; 10-30-2013 at 08:35 PM. |
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10-31-2013
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#113 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,686
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Re: TOP END REFINISHING
If you could add a 5V reference signal, you should measure how smoothly the TPS outputs varying voltage as you move the throttle. If you see jumps in the voltage, then the TPS has worn spots which will cause inconsistent fuel/spark.
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10-31-2013
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#114 |
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Join Date: May 2013
Location: Beaver, PA
Posts: 515
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Re: TOP END REFINISHING
Yep, I agree. It would be better to measure the TPS voltage as it is varied instead of calculating resistance. You would then get an operational view of the output of the TPS. You can use a computer power supply for a 5 volt signal voltage if you have one laying around.
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10-31-2013
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#115 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: TOP END REFINISHING
I did operational voltage in the TPS thread. Smooth, uninterrupted, linear voltage increase...
Not satisfied tho'... Quote:
One of the secondary butterfly screw heads sheared off of the butterfly shaft. TB inside and out is clean as a whistle, but now this... Can low - profile nut/bolt sets be purchased for the shaft? And, the irony / Carma of the DAG question; I've tarnished the finish in the rearward part of the P side bore. Snappics shortly here...  At worst, new (or rebuilt) TB. At best, lose a few CFM with different screws in the shaft??????????????? |
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10-31-2013
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#116 |
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Join Date: Dec 2012
Location: Ponoka, Alberta, Canada
Posts: 158
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Re: TOP END REFINISHING
Schrade; I have the screws and secondary throttle plates I recently removed from my 91.
If you need some shoot me a PM with your address. |
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10-31-2013
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#117 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: TOP END REFINISHING
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11-01-2013
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#118 |
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Join Date: May 2013
Location: Beaver, PA
Posts: 515
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Re: TOP END REFINISHING
I don't think so Schrade as I had 5 holes in mine and didn't experience hesitation. If I remember correctly that bottom hose goes to the IH to pull crankcase vapors.
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11-01-2013
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#119 |
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Join Date: May 2013
Location: Beaver, PA
Posts: 515
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Re: TOP END REFINISHING
Schrade, I have a suggestion for ya. It may be better if you had a small insert inside that rubber pipe as it tends to get soft from the oil fumes and heat in back of the plenum. That way it won't collapse. I built a new pipe from soft copper and fittings and used it before I bought an original pipe from Jerrys. IMO that GM design was cheap and dirty.
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11-02-2013
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#120 |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: TOP END REFINISHING
So set the P side IH.
Blot the head surface with a paper towel: clean (Jerry said DRY, no thin grease film, as I'm accustomed)  Set the gasket; make sure they're aligned with a Phillips head (WTH is Phillips anyway? ) 
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Linear Mode
