Hey guys,

so yesterday I did a buncha of maintenance stuff of my car. Took out the IACV and cleaned it out, Speed sensor and cleaned and refilled my tranny with fluid, took off the TPS and put it back on. Turned car on and everything was perfect. Then I decided the Disconnect my 2.5 Bar Motorola MAP sensor to relocate the wire then reconnected it EXACTLY as it was before. Now car will start and immediately shut down (within a few seconds). I tried everything to figure out what is causing that. I have a chipped ECU and it came with the 2.5 BAR sensor so i did not replace anything. Everything worked until I touched the MAP sensor and the car is now NOT starting. Could it be that I have damaged something? Are those MAP sensors that unreliable? Is there a way I can test to see if its damaged to get a new one? Any help would be reallly appreciated. Thanks!

 

Bump!

 

Yes they suck that much. Mine did exactly the same thing and I couldnt figure it out until I looked at my map with the computer hooked up and the sensor was reading full vacuum with the car off)...I just replaced it with an omni power unit and its been win since then.

 

Wow ok, basically I dont not have an EMS and no port to hook up my PC to the ECU. Is there any physical way to diagnose whether the MAP sensor is bad? Like voltage readings etc? I have a Volt and Ammeter but I do not know what values the MAP should be sending out. Any help?

 

Overboost Bumpin'

 

Anybody??

 

Off the top of my head, with the key on/motor off you should see 2.5volts on the signal wire/output.

 

Hmmm I ran some more tests. Wierd. The signal out wire if NOT connected to the Map Sensor shows around 4.6 Volts but if connected to the Sensor, the voltage drops to around 0.325 Volts and I hooked up a foot pump to the pressure port and pumped it up to around 25 PSI and the reading does not change at all. Is that normal? Time for me to get a new sensor?