Crank NO START MAP SENSORS

Hello everyone! So let me just start from the beginning here lol - recently a week ago I noticed a noise coming from my rear, I checked it out and saw my axel was leaking. So me and my buddy replaced my axel seal gasket, but in turn popped the DIFF TEMP SENSOR out, and we started the car up without it plugged in. It put the car into limp mode and threw a CEL. We drove it down the road quick and it made 0 boost. We parked it and plugged the DIFF TEMP SENSOR back in, and still had a MAP CEL. After seeing that we hadn’t noticed there was 3 ACDELCO MAP sensors (2 black and 1 red) so we had replaced 1 of the 3 with a BOSCH MAP sensor, and I believe the place sent me the wrong part number as well but not 100% sure. After we plugged the BOSCH sensor in, it fired up and we drove it down the road, still 0 boost. So we parked it and put the old sensor back on and then all of a sudden it wouldn’t start. Crank no start. We ordered 3 ACDELCO MAP sensors (2 black and 1 red) and replaced those yesterday. Still at a crank no start. We checked for spark and we are getting spark, but upon cracking the fuel rail, nothing dripped out even knowing I have a full tank of 93 in it. At the moment I’m at a complete loss as I don’t know why I wasn’t making boost, and now I can’t even get it to start. So as a recap it started with no BOOST PSI, now it won’t start and potentially still doesn’t get BOOST PSI. Maybe vacuum leak for BOOST? Idk? Not sure where to look for a boost leak, but can’t even get it started to check now . Not too sure what’s going on but I will Provide a mods list below so you all know general what’s been done to it. TIA
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• Full fore fuel system reg pump and rails
• Tuned for E85 & 93
• D&H motorsports crank case breather and catch can
• Vader heat exchanger
• Vmp under hood ice tank
• ID 1300 injectors
• Custom grind cam
• Ported Heads
• Ported Blower
• 2” stainless works headers
• Straight piped into Borla Mufflers
• Linginfeltzer Upper pulley
• ATI lower pulley
• 102 mm throttle body

CalebSea04 said:

Hello everyone! So let me just start from the beginning here lol - recently a week ago I noticed a noise coming from my rear, I checked it out and saw my axel was leaking. So me and my buddy replaced my axel seal gasket, but in turn popped the DIFF TEMP SENSOR out, and we started the car up without it plugged in. It put the car into limp mode and threw a CEL. We drove it down the road quick and it made 0 boost. We parked it and plugged the DIFF TEMP SENSOR back in, and still had a MAP CEL. After seeing that we hadn’t noticed there was 3 ACDELCO MAP sensors (2 black and 1 red) so we had replaced 1 of the 3 with a BOSCH MAP sensor, and I believe the place sent me the wrong part number as well but not 100% sure. After we plugged the BOSCH sensor in, it fired up and we drove it down the road, still 0 boost. So we parked it and put the old sensor back on and then all of a sudden it wouldn’t start. Crank no start. We ordered 3 ACDELCO MAP sensors (2 black and 1 red) and replaced those yesterday. Still at a crank no start. We checked for spark and we are getting spark, but upon cracking the fuel rail, nothing dripped out even knowing I have a full tank of 93 in it. At the moment I’m at a complete loss as I don’t know why I wasn’t making boost, and now I can’t even get it to start. So as a recap it started with no BOOST PSI, now it won’t start and potentially still doesn’t get BOOST PSI. Maybe vacuum leak for BOOST? Idk? Not sure where to look for a boost leak, but can’t even get it started to check now . Not too sure what’s going on but I will Provide a mods list below so you all know general what’s been done to it. TIA
————————————————————————

• Full fore fuel system reg pump and rails
• Tuned for E85 & 93
• D&H motorsports crank case breather and catch can
• Vader heat exchanger
• Vmp under hood ice tank
• ID 1300 injectors
• Custom grind cam
• Ported Heads
• Ported Blower
• 2” stainless works headers
• Straight piped into Borla Mufflers
• Linginfeltzer Upper pulley
• ATI lower pulley
• 102 mm throttle body

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2010 Sedan V 750 RWHP