I run a Lt4/Mt4 and the problem im having is very inaccurate map sensor readings. The engine can be off and the ignition can be on and the computer shows 5psi. I took my car to the track about 3 wks ago... i was running 11psi but eh computer was reading 25psi which made it run crazy rich(bogging, misfiring etc...).



I sent the computer back to microtech(AUS) so they can check it and all came back well, they said for me to check my wiring. I went over the wiring for the map sensor about 10x and all is well. I even replaced the map sensor and same exact **** is happending.


Im to the point where if theres anyone Close to MD,PA,NJ and have a little time on there hands or is travling my way i'll pay someone whose familiar with the microtech to check over it and tell me whats wrong.

Would tps calibration have anything to do with this? Its calibrated right, but im to the point where im willing to try whatever to fix it.


Lee

 

is it a external map sensor??

 

yes external

 

do you still have the internal one ?

 

the new MT/4 never came with an internal map sensor... only external plug for a 3bar

 

i would say you have a 2 bar sensor not a 3 bar sensor

 

Give me some part #'s 3bar#, 2bar#.. and what your saying is the system uses a 2bar not a 3bar? or are you saying the system uses a 3bar and i have a 2bar map instead of a 3?

please explain.



Weather its a 2 bar or 3bar it still should read accurate right?

 

Not past 14 psi

 

my problem is all over the map readings

 

i dont have any part numbers handy,

you have a 2 bar and your suppose to have a 3 bar,

no it wont be accurate, 2 bar only reads to 14.7psi and 3 bar to 29.4psi

Dale

 

ok dale.. but would that make in inaccurate at idel and even when the hey is on engine off read 5psi.?

if its a 2bar and not a 3bar then it would be inaccurate only after 14.5psi?

meaning anything under 14.5psi it would read fine and be dead nuts?

 

Where are you getting your MAP source from?

 

think about it

0-5v sensor,

one is calabrated to read from -30 to 14.7psi
one is calabrated to read from -30 to 29.4psi

of couse it will be out and wont read correctly...

you have the wrong sensor, get a GM 3 bar, same as what a haltec uses and it will be fine

 

the front of my intake

 

well whats the gm 3bar map part #?

 

i dont know, i never buy them, i ALWAYS got supplied a 3 bar sensor when i purchased a 3 bar ecu....

do a search you will find your answers

 

Well 10sec Rx7, I must say you are right, i did a little searching and i found out i have a ******* 2bar map sensor instead of a 3bar. Heres the site i found to help people identify there map sensors http://www.robietherobot.com/Storm/mapsensor.htm


Im gonna get a 3bar from GM tomorrow and hopefully that fixes the inaccuracy. Im sure it will since i have the wrong sensor

 

Be sure it's the bottom nipple.

 

You were right 10sec rx7, i had the wrong map sensor the thing reads dead nuts now. HAH I gotta retune the whole things now since its so accurate \\


I just wanna say thanx to all that helped me

 

you're joking?

 

yah... its right at the back of the intake

i mistyped