Mercruiser 7.4L MPI slowing down
#71
Registered
So your still working on that? I’m not sure exactly what a boat-in-a-box is but it would basically allow them to bypass pretty much all of the boats wiring to see if it’s an electrical issue.
https://m.autozone.com/greases-and-g...1-5oz/898352_0
is that the same type of spray?
CRC has 14086 Freeze Spray. It's not for break away but specifically for testing electrical components.
#72
Registered
iTrader: (1)
So your still working on that? I’m not sure exactly what a boat-in-a-box is but it would basically allow them to bypass pretty much all of the boats wiring to see if it’s an electrical issue. I’m not sure exactly where it hooks in so I am using my engine and fuel but the actual boat is being run by the boat-in-a-box.
Who makes freeze-it? When I google it I get hair spray. Does it cool to -65 if so it’s probably the same as an autozone type of freeze spray. This is called freeze off:
https://m.autozone.com/greases-and-g...1-5oz/898352_0
is that the same type of spray?
#73
okay thanks Bill. I was able to get it at a Grainger store locally I was confused because the same company makes one for bolts and they both cool to - 60
#74
Registered
the electronic cool spray will leave no residues and would have nothing that would be corrosive/contaminate to electrical systems
#75
My mechanic ran it on Wednesday for over an hour and it did not occur. It was pretty cool outside so that likely was the cause. They ran it a second time and when it occurred they tried spraying freeze it on ECM and did nothing.
today he ran it again today and it took a while but after over an hour it slowed down and he then opened hatch and it cleared it temporarily. So opening engine hatch cleared it in all but one time (the time it didn’t it was pretty warm outside). He tried replacing my ignition module because he said it’s located in distribution box but if issue persists he said I may need to add a vent for the engine. Couldn’t this possibly add a lot more noise as well? Maybe a 12v batt exhaust fan
Any ideas on what could be heating up and how I can cool it off?
Thanks
Scott
today he ran it again today and it took a while but after over an hour it slowed down and he then opened hatch and it cleared it temporarily. So opening engine hatch cleared it in all but one time (the time it didn’t it was pretty warm outside). He tried replacing my ignition module because he said it’s located in distribution box but if issue persists he said I may need to add a vent for the engine. Couldn’t this possibly add a lot more noise as well? Maybe a 12v batt exhaust fan
Any ideas on what could be heating up and how I can cool it off?
Thanks
Scott
Last edited by Scottd21; 08-09-2019 at 01:34 AM.
#77
okay well he actually replaced the ignition control module today but couldn’t test it, I am hoping that it’s that. Will find out this weekend
#78
Registered
Mefiburn's diagnostic service to rule out the ECU is only $80 plus shipping both ways. I'm going to do it for mine as well after reading information elsewhere regarding these years and engines ECU's causing the issues we're having. I figure that's the only way to truly rule it out. They can then repair your ecu for $500 or less per their website.
Good luck this weekend. I replaced and tested some ignition parts and PCV yesterday for 4 hrs. in the Fl heat and humidity and now to blown out to go on the water in 102* heat index. Going to pull the ECU and injectors instead, fun times!!
Good luck this weekend. I replaced and tested some ignition parts and PCV yesterday for 4 hrs. in the Fl heat and humidity and now to blown out to go on the water in 102* heat index. Going to pull the ECU and injectors instead, fun times!!
#79
Mefiburn's diagnostic service to rule out the ECU is only $80 plus shipping both ways. I'm going to do it for mine as well after reading information elsewhere regarding these years and engines ECU's causing the issues we're having. I figure that's the only way to truly rule it out. They can then repair your ecu for $500 or less per their website.
Good luck this weekend. I replaced and tested some ignition parts and PCV yesterday for 4 hrs. in the Fl heat and humidity and now to blown out to go on the water in 102* heat index. Going to pull the ECU and injectors instead, fun times!!
Good luck this weekend. I replaced and tested some ignition parts and PCV yesterday for 4 hrs. in the Fl heat and humidity and now to blown out to go on the water in 102* heat index. Going to pull the ECU and injectors instead, fun times!!