Map sensor issues

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Map sensor issues

dbrough Thu Sep 24, 2020 3:05 pm

Little background My car was boosted for the past 2
1.5 years using neptune and an omni 3 bar map sensor without issue.

Recently i went NA and switched back to a stock map sensor, wrote a completely new Map for this setup.

I get the tune about 90% dialed and then the map sensor goes on the fritz and starts logging 10.3 psi.

I replaced that oem map sensor with another. Make slight adjustments to the tune, 3 days later that map sensor is doing the same thing. I replace it with a non oem map sensor and make slight adjustments to the tune again, 2 days later intermittently on the fritz again.

Hook up the laptop for live graphing key on engine off map is reading 10.3 psi. Wait an hour, come back outside and check map is reading 0 psi key on engine off. Car starts up perfectly. Go for a 20 minute drive back on the fritz.

I check 5v input at the sensor and i am getting 5v.

Anyone ever see something like this? Having a hard time believing 3 bad map sensors. FWIW I am using a rywire tucked harness also about 1.5 years old, no shorts or open spots in the harness that i can see.

dbrough

 
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HRTuning Thu Sep 24, 2020 4:25 pm

Sounds like wiring is an issue or killing sensors. You've proven such with repeatable results.

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dbrough Thu Sep 24, 2020 5:49 pm

I agree it does sound like it. But harness is perfect. Again just 2 months ago the car was running fine boosted with the 3 bar. No changes to wiring made. The harness is neatly secured and ecu is mounted to a plate. Definitely has me scratching my head.

A friend said he had a similar issue a while back that. Jumper shorted in the ecu and was sending 12v to the map and frying them. But when i check my input its reading 5.02v.

I am wondering if its possible an intermittent short in the ecu?

I just installed map sensor #4 and she is back purring like a kitten for now

dbrough

 
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dbrough Thu Sep 24, 2020 6:15 pm

Actually there was one change to wiring made. I removed the mac solenoid, pulled the fuse from the 12v to it and taped up the PWM signal wire...

dbrough

 
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HRTuning Thu Sep 24, 2020 8:42 pm

A short in the ECU would damage the ECU.

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dbrough Sun Sep 27, 2020 6:36 pm

Problem solved with the help of live graphing!!! It was the connector on my fairly new tucked harness. When i moved the connector around it dipped from -45mbar to 11.2psi

dbrough

 
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HRTuning Mon Sep 28, 2020 11:41 am

Glad you got it!

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