Hello,
I have a 22 shamrock boat with a stock PCM 5.7 liter throttle body injected motor (S/N of motor SLL PRL10 TBI). I believe the motor is a 1996, and has a MEFI 2 ECM. I have attached a picture of the ECM, not sure if this ECM is original I have only had the boat a year. I have been having a high idle issue for a while now. The motor usually starts up and runs perfect, but after running for 30 minutes or more if you go to slow down the idle will not idle back to 600 RPMs, it will stay between 1100-1600. This does not happen all the time, but it does happen about 90% of the time. If you cut power to the engine wait a few minutes then start back up it will correct the problem (sometimes I have to cut engine several times to get it to idle correct again). I have one of those cheap rinda technologies code readers and it keeps giving me a code "52 ECM hardware failure". I will erase the code and it keeps coming back. Things I have done are:
1. Replaced IACV twice
2. Checked for vacuum leaks
3. I checked the voltage at several places going to and from the ECM:
A: J1-13 sensor ground ( good ground)
B: J1-14, ECM ground good
C: J1-15 5 volt supply to sensors, had 5 volts going to this.
D: J1-16, battery feed (had 12.4 volts)
J1-30: ECM ground, had good ground
J1-31: 5 volt to MAP sensor, had 5 volts at the plug
J1-31: battery feed, had 12.4 volts.
4. I also pulled the plugs going to the MAP and throttle position sensor and checked them and they were both getting 5 volts going to them and I checked the grounding and they were good.
5.I pulled off the flame arrestor and un hooked the throttle cable to make sure the throttle is at its seated position and not slightly accelerated still high idle.
6. I have unplugged the IACV while idling high and the idle does not change.
The only thing I have not checked is the TPS.
My question to you is do you think I have an issue with my ECM or do you think it is something else? If something else what do you think?
If it is my ECM what are my options for replacing? I was told AZ speed sells a conversion kit to make a MEFI 4 work and they give you directions how to configure your J1 ans J2 PINS to fit the MEFI 4. What I am concerned with is my MEFI 2 has the knock sensor modules, not sure how the MEFI 4 will work. Anybody know where I can purchase an MEFI 2? or who sells MEFI's in general?
I have a 22 shamrock boat with a stock PCM 5.7 liter throttle body injected motor (S/N of motor SLL PRL10 TBI). I believe the motor is a 1996, and has a MEFI 2 ECM. I have attached a picture of the ECM, not sure if this ECM is original I have only had the boat a year. I have been having a high idle issue for a while now. The motor usually starts up and runs perfect, but after running for 30 minutes or more if you go to slow down the idle will not idle back to 600 RPMs, it will stay between 1100-1600. This does not happen all the time, but it does happen about 90% of the time. If you cut power to the engine wait a few minutes then start back up it will correct the problem (sometimes I have to cut engine several times to get it to idle correct again). I have one of those cheap rinda technologies code readers and it keeps giving me a code "52 ECM hardware failure". I will erase the code and it keeps coming back. Things I have done are:
1. Replaced IACV twice
2. Checked for vacuum leaks
3. I checked the voltage at several places going to and from the ECM:
A: J1-13 sensor ground ( good ground)
B: J1-14, ECM ground good
C: J1-15 5 volt supply to sensors, had 5 volts going to this.
D: J1-16, battery feed (had 12.4 volts)
J1-30: ECM ground, had good ground
J1-31: 5 volt to MAP sensor, had 5 volts at the plug
J1-31: battery feed, had 12.4 volts.
4. I also pulled the plugs going to the MAP and throttle position sensor and checked them and they were both getting 5 volts going to them and I checked the grounding and they were good.
5.I pulled off the flame arrestor and un hooked the throttle cable to make sure the throttle is at its seated position and not slightly accelerated still high idle.
6. I have unplugged the IACV while idling high and the idle does not change.
The only thing I have not checked is the TPS.
My question to you is do you think I have an issue with my ECM or do you think it is something else? If something else what do you think?
If it is my ECM what are my options for replacing? I was told AZ speed sells a conversion kit to make a MEFI 4 work and they give you directions how to configure your J1 ans J2 PINS to fit the MEFI 4. What I am concerned with is my MEFI 2 has the knock sensor modules, not sure how the MEFI 4 will work. Anybody know where I can purchase an MEFI 2? or who sells MEFI's in general?
