97 explorer 302 microsquirt

Sep 20, 2018
25
1
13
58
minnesota
#21
It is set to aem 3.5 bar. Either my sensor is faulty or the wiring is wrong. I dont have a 5v regulator to test the sensor tho
 
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a91what

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Mod Dude
Apr 6, 2011
6,898
4,065
204
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Hillsborough county
#22
Check the wiring, you would not be the first person to get the wires mixed up. What year is the car? Around 91 the wire colors can be different from what the instructions show
 
Sep 20, 2018
25
1
13
58
minnesota
#23
I have a 97 explorer block in an 85 190e mercedes. I had the wires wrong once before after a rewire and ecu relocation and have since fixed them. They were wrong it wouldn't boot up no ecu signal no start. I just checked via power probe and have 5v reference and ground. The return wire had a flicker of power
 
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Sep 20, 2018
25
1
13
58
minnesota
#26
Right the sensors output wire is hot in action I unplugged the sensor and tapped from the plug. Think it's the sensor
 
Sep 20, 2018
25
1
13
58
minnesota
#27
Took the intake apart and tested the map writing all plugged in, the return wire green had 3.4-3 6V whole time even when I blew into it. Thought it would change more basically was 3.5 the whole time 20 sum psi? Doesnt sound right. Think it's the sensor I'd like to bench test it
 
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a91what

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Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#28
open to the air you should be getting 100kpa reading on the sensor. you can use a vacuum signal and the voltage should lower.
 
Sep 20, 2018
25
1
13
58
minnesota
#32
Replaced the MAP it now reads high 90.s with the engine off. My fuel maps are so out of wack it wont start. I am attaching a short data log I took while trying to start.
 

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Sep 20, 2018
25
1
13
58
minnesota
#34
Thank you, I appreciate the help, learning this as I go. Used the fuel table generator the numbers may have been too far out
 

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a91what

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Mod Dude
Apr 6, 2011
6,898
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204
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Hillsborough county
#37
lol these fuel numbers are not going to work..... lets start over... I assume this is a 302? what cam intake and heads. power adder?
 

a91what

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Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#38
Never mind i found it, 100% stock explorer engine???.... I usually charge $75 for a base tune but i will let you have this one. This was from a car with a similar combo I did have to scale the injector size.
 

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Sep 20, 2018
25
1
13
58
minnesota
#39
Its actually got an f cam 512 lift with heads to match. Thank you! I will plug her in to.orrow and see what's what!
 

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