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Originally Posted by BowTie Eater 5 Liter
stock maf and throttle body. what i dont understand is though, why did it run perfectly after we swapped it into the truck, and now it runs like a pos? can i just reset the tps to .98? what is the PIP in the distributor?
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The 94/95 EEC has adaptive learning strategies built in. When you clear it out by disconnecting the battery, it re-learns and stores the various sensor values in the KAM(keep alive memory).
There are tables in the EEC with minimum values so the car can start and run but the computer makes adjustments using the sensor input and the updated values are stored in KAM.
The TPS voltage is set on startup on a 94/95 and used until the next startup which resets the TPS voltage. A worn TPS can cause the bad drivability you state.
The PIP or 'Hall effect' module tells the EEC when cylinder 1 is at TDC and is well known to cause problems in 94/94's when it goes bad. The only way to replace it is to remove the distributor.
The EEC has minimum/maximum values that it operates in so a sensor can be failing but, still in the range so the CEL is not tripped but the car runs like crap.
Did you scan for codes?