my 95 ranger 2wd with the 2.3l will not run worth a damn... when it idles it misses real bad and the truck will not rev above 4,000rpm.. when you put the gas pedal about 1/2 way to the floor it will rev up to 2k alright but if you floor it it will just fall on its face... I have no idea where to start as this is my first ranger.... it has the 8 spark plug motor if that helps... I have already hooked up my scanner and there do not appear to be any codes and there is no CEL I wanted to ask some people who know more about rangers before I start throwing parts at it.... it sounds somewhat fuel related to me but I dont know....any help will be much appreciated... thanks in advance..

 

I messed with it some more tonight tried unplugging some sensors and I think its the MAP sensor... when I unplug it nothing changes at all... the truck runs rough at an idle, will run decent at 1500-2500rpm and falls completely on its face at full throttle... I guess maybe try a different map sensor?

 

have you hooked a vacuum gauge or en exhaust backpressure gauge to it to see if you have a clogged cat?

 

ya I forgot to add it has no cat... the previous owner removed it for whatever reason.... I had a friend tell me that motor will not run without a cat but I kinda figured thats BS since a 2007 4.0 ranger will run with no cats....

 

wouldnt you think unplugging the MAP sensor would make it run different? when I unplug mine it runs the exact same..like crap

 

being that it is obdII, if it is functioning properly, when you unplug it the computer will use a default setting for that sensor so the engine can continue to run right. if the sensor was open or shorted, you would notice a change in the way it runs when you unplug it.

as for the cat, itll definately run without it, whoever told you that, it is BS

if you have an analog voltmeter you can check the TPS voltage sweep. also, do you think the timing belt could have jumped a tooth?

 

it does not seem like the timing belt skipped a tooth as it seems to run pretty good at 2000rpm and i think if the belt jumped it would miss and run like crap all the way through the rpm's??? I really dont know at this point but I think I will run to the wrecking yard and see if I can find another MAP sensor and try that.... next I think I will change fuel filter and all that crap that needs done anyway....

 

oh and yes I have a voltmeter to check the TPS what should the range be? I need to go get a book for this thing too I guess...

 

.96v at TB closed and it should go up from there, smoothly. I don't recall how high.

 

ok cool I will go check it out

 

TP voltage will never reach nor exceed 5v so .98 at closed to 4.96 at WOT id guess

 

the TPS reads 1.0vdc closed and around 5.0vdc full throttle so I guess thats ok... is there a way to test the MAP sensor?

 

anymore ideas guys? I wanna get this thing running decent so I can start building it and getting it ready for the desert!

 

i sure hope sumone gives u sum answers on this...i am having the exact same problem...3500 to 4000 rpm is all i can get...and no power at all...disgusting this thing wont get out of its own way...rough idle...but at the same time it runs fine throughout the rpm range i do get...gas mileage isnt bad either...i have no cat, atleast the internal part of it...no codes either...driving me nuts...my friend has a 96 2.3 and it will tear sum stuff up, rev high and chirp 2nd gear everytime...driving me nuts

 

Try the map sensor when unpluged you should see a change in the way the engine is running.

 

thanks...i will give that one a shot...

 

check your Idle Air Control, little electric motor on the intake, just take out the two flathead screws and check if it is dirty, or even bad. I disconnected mine, and it really went ape **** it was idling real rough, or maybe check your fuel injectors, if you put the T pins in them and hook them up individually to a scan tool, it will show you how they pulse, and maybe you can find a bad one..

 

I was thinking the same! when I unplug the MAP sensor it does nothing different which makes no sense to me at all. I would really think unplugging it would make it run different if there was no problem with it... I will see about getting another one to try this is driving me nuts!

 

My timing was 3 notches off a while back and it still ran / idled fine, but it had NO power.

 

how do u check that on these engines ?

 

i'm pretty sure you don't have a MAP sensor on your truck. you have a MAF. where is this sensor you think is the 'MAP'?

 

If that question is to me? my truck DOES have a MAP not MAF... I do know the difference between the two and the sensor is right under the coil packs and has a plug and 2 vac lines coming into it which makes it a MAP. does not have a meter in the intake... how do I go about testing the MAP?

 

ok smart guy. go get a book and see. that is not a MAP and those are not vaccum lines. that is a DPFE, follow those lines and i'll bet a beer they go to the exhaust. sorry i tried to help you, you obviously allready know everything.

 

Can you post a pic of what your talking about? Bryan is right a 95 ranger should have a MAF not a MAP sensor. Was thinking about my 87 LOL.

 

A MAF sensor goes in the intake and senses air flow coming through the intake and my ranger does not have one of those on it... and to the best of my knowledge if the rig does not have a MAF then it will be equipped with a MAP which will sense vacuum pressure rather than airflow... this is what my truck has weather you guys want to believe it or not...

here are the only pics of my motor I have here at work (look at the intake and tell me where you see a MAF sensor in there)


the MAP sensor is under the coil packs