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Adjustable MAP sensor no start

Performance mods and Advanced Stroker discussion.
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Craigwhite73
Posts: 4
Joined: May 16th, 2017, 3:34 pm
Stroker Displacement: 4.6
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Cherokee
Contact:

Adjustable MAP sensor no start

Post by Craigwhite73 » May 26th, 2018, 4:44 pm

I searched the world over and have found no love on this subject. I have a 1989 Cherokee (Renix) and it is a 4.6 stroker. I have a 99 intake, aftermarket header (E bay), polished and ported head (7120), throttle body is bored to 62 mm (1995 ZJ), and I am running Bosch 0280155712 injectors. The exhaust is 2.5 inches, and nothing crazy has been done with the ignition. All sensors have been replaced with new ones except the MAP sensor, and I am assuming it is original. Now to the problem I have built an adjustable MAP regulator based on GoJeep, WaterforGas designs, and it is on a DPST switch. With the switch on factory mode it starts fine, but runs lean and runs hot (radiator), as far as cooling I do have a three row radiator, high flow water pump, high flow thermostat, and two factory electric fans. When I switch it to the regulated it will not start, and any response will be greatly appreciated.

rammit11
Donator
Donator
Posts: 118
Joined: April 27th, 2010, 4:29 pm
Stroker Displacement: 4.6
Vehicle Year: 1998
Vehicle Make: jeep
Vehicle Model: cherokee
Location: southeastern pennsylvania

Re: Adjustable MAP sensor no start

Post by rammit11 » May 26th, 2018, 5:25 pm

hi, are you 100% positive that you have a full 12v with key on and in crank position feeding the switched position?

Craigwhite73
Posts: 4
Joined: May 16th, 2017, 3:34 pm
Stroker Displacement: 4.6
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Cherokee
Contact:

Re: Adjustable MAP sensor no start

Post by Craigwhite73 » May 26th, 2018, 7:07 pm

I actually ran a wire straight from the battery to the adjustable MAP sensor.

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