97 , 5.7 , 2bbl thunderbolt V, ECM module

[sjbinc]

I run my engine for a short run, all gauges normal. The engine dies, I let it cool down 2 hours and starts aok and does same. I have checked everything twice so the next time it dies I pour cool water over the module [807264t3]<br />the engine starts right away. I have tried this 3 times and it works each time.<br />My question is, should I order this part or are there further tests to prove the part is bad?<br />This part is quite expensive and there are no returns for this type of module.<br />Thank you,<br />sjbinc

 

[Don S]

Re: 97 , 5.7 , 2bbl thunderbolt V, ECM module

That's not exactly a test mentioned in the Mercruiser service manual, but it shows there may be a problem when the ICM (not ECM) gets hot. <br />No way of really testing them short of replacing.

 

[achris]

Re: 97 , 5.7 , 2bbl thunderbolt V, ECM module

I've found a Thunderbolt V diagnostic chart for you. It does sound like you've found the culprit, but run this chart and see how you go.<br /><br /> Thunderbolt V ignition system. <br /><br />Go to page 17 and you'll find a flowchart.<br /><br />Good luck.<br /><br />Chris.............

 

[John_S]

Re: 97 , 5.7 , 2bbl thunderbolt V, ECM module

You might try cleaning the module and re-appling the thermo paste to make sure you are getting a good heat transfer from module to the metal mounting bracket. Also check for corrosion on terminals. See top of page 10 of the link.