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-   Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)
-   -   525 efi issue (https://www.offshoreonly.com/forums/do-yourself-boating-budget/356150-525-efi-issue.html)

BUP 08-26-2018 03:19 PM
Originally Posted by fastmcars (Post 4645716)
The saga continues. I put the computer from the good motor on to the bad motor, it fired up and ran. Then after starting 3 more times, it wouldn't start. Put the computer back on the good motor, it worked fine. Checked fuel pressure, ok. Next check firing of plugs .
Even thou I am getting into ECM / PCM repair more and more by the day - never ever take a KNOWN good computer and put it on a bad engine - always take the bad running engine computer and put it a known good running engine. WHy would one do this ---- because you are not putting the known GOOD ECM at risk. Hate to see owners cause their own headaches. The tip for the day and possible saving boat owners ECMs / PCM s.

BUP 08-26-2018 04:05 PM
try unpluging the water pressure sensor - did your problem go away ? IF not plug that back in and see if that help but before check out the connection / connector real well. If problem still exists -- NEXT unplug your fuel pressure sensor - did problem go away ? Check connections and connector - plug back in - does problem still exists ?

fastmcars 08-27-2018 07:00 AM
Originally Posted by BUP (Post 4645761)
try unpluging the water pressure sensor - did your problem go away ? IF not plug that back in and see if that help but before check out the connection / connector real well. If problem still exists -- NEXT unplug your fuel pressure sensor - did problem go away ? Check connections and connector - plug back in - does problem still exists ?
Yes, that's my next step. After replacing batteries, the motor fired right up. It ran until about 140 degrees, shut off and never started again. I put fuel pressure gauge back on and had 40-45 psi. I think it must be a sensor that is heating up and then it shuts the motor off. It must not cool off for a long time.

fastmcars 09-02-2018 08:32 AM
Originally Posted by fastmcars (Post 4645836)
Yes, that's my next step. After replacing batteries, the motor fired right up. It ran until about 140 degrees, shut off and never started again. I put fuel pressure gauge back on and had 40-45 psi. I think it must be a sensor that is heating up and then it shuts the motor off. It must not cool off for a long time.
I meant "It MUST cool off for a long time".

BUP 09-06-2018 10:07 PM
Any updates here good or bad ?

fastmcars 09-10-2018 01:49 PM
Still digging. Going to buy Rinda and test sensors. Tried swapping things to no success.

AllDodge 09-10-2018 01:56 PM
I have heard that those sensors are on a 5 volt reference loop. A friend of mine, with an 8.1 suburban, had a similar problem that was throwing a crank sensor warning, but it turned out to be another sensor on that same 5 volt loop.
HELP!!!! Thanks
Have you checked for 5V on the sensors?
Check any one of them (water pressure or other) to see if you have a full 5V

fastmcars 09-10-2018 10:43 PM
Yes, 5 volts.


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