2000 Ram Torque Converter Lock-up: Bad science, good results

From : jackvt80

Q: and what exactly is the pcm basing its input on how about engine load and it determins that baced on the map tps and rpm of the engine. um no. it determines shift points based on rpm tps and input from the governor pressure sensor. remember that list i posted no here fluid temp tps speed sensor gov pressure sensor pcm gov pressure solenoid valve yes max i remember and your list includes the pcm and if the pcm is controlling the shift points why is it mentioned as an input youll notice that the map sensor isnt on there. notice also that all of those inputs go to the pcm. so if all the inputs go to the pcm they could say that the pcm determines shift points. but they listed the inputs that the pcm uses to shift the trans and map isnt one of them. but they included the pcm itself as said above. why do you think that is perhaps because engine load is also a factor determined by the pcm and there is no need to further complicate matters by including all of the sensors and inputs that the pcm uses to determine engine load. lol you really do like making a fool out of yourself dont you how do you make an out of tune engine deliver the same amount of power how about stepping on the gas a little harder and what happens when you do that answer for a given rpm that means that the throttle is opened more and the vacuum is less. so while you are correct on throttle position in relation to rpm you seem to have no concept on what is can effect it.. how well the engine is tuned has very little to do with rpm and throttle position when looking at vacuum. that is just about the dumbest thing to come out of you so far. it has everything to do with it when the engine is under load. those two variables are what determine vacuum in the engine. not the sparkplugs or the plug wires or the cap and rotor or the coil or coil packs. none of those change vacuum. they dont change the engine vacuum in relation to throttle position but they do effect the amount of power the engine can deliver at specific throttle position which means to recover the lost power at the same rpm the throttle needs to be opened further which increases manifold pressure. if you want to argue that tps signal is changed thats true and id agree but lets look at something.... what exactly are we going to look at max. by saying the tps signal will change only proves that the manifold pressure will also change for a given rpm which basically is you saying that you are incorrect in your previous statement. hi all98 ram 15005.9 4x4 quad cab.90715 miles. for the past weekit has started shifting later than it used toand a couple of times wouldnt shift out of first unless i let off the gasthen it shifted with up through the gears. when this happenedi just got off the freewaypulling away from a stop sign. it hanging on longer to shift.any ideas and suggestions would be appreciated. thanks. clearly he is describing a problem that has to do with pcm control of the trans not a change in tire size or a poorly tuned motor no mention of sluggishness. furthermore the problems he describes have been attributed to the governor pressure sensor and the governor pressure transducer. thus were not looking at a tune up were looking at pulling the codes and seeing what the pcm has to say. i never said that it was due to the tune of the engine. i simply disagreed with your crap that engine load has nothing to do with shift points. first step would be to check the pcm for codes. since its a 98 youll need to have it scanned for these codes. second might be to change filter and fluid in the trans and put a new set of solenoids for the governor pressure sensor and transducer. interesting since thats the first thing i mention doing. and i never said that you were wong there. correct but the state of tune would have to be drastically degraded to have a change in shift point no something that generally happens overnight. really really. what if the cap cracks or an injector hangs or fails it causes a misfire something that might be a bit more noticable than shift points. misfires are not always so easily detected especially when the pcm will do all it can to correct such things including things that can have a significant drop in performance but as i say again i am not saying that this is the cause only that you are full of shit that these things can never happen overnight. the regulator in the fuel pump goes bad poor engine operation would result but the op doesnt mention that. possibly it depends on how badly it failed. or a sensor fails. all of these things can happen in an instant. wow a sensor fails.... what was it that i said to check lol once again you prove your ignorance. not all failures flash a code since not all failures are complete failures and if the pcm is not aware that the sensor is not functioni

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From : miles

dave lee wrote my 2000 caravan 3.3 auto has 85k on it. this morning the trans refused to shift up so im in first gear. i also have reverse. the engine light came on also. have not pulled codes yet. any ideas this early w/ this info output speed sensor on the transmission. happened on the wifes last week. easy fix. .