Mercruiser 5.7 2001 EFI no start

[dmlinn]

Mercruiser 5.7 EFI, mfg. 2001, Alpha One outdrive, 2002 Monterey Montura 218, don't have the serial #, can't read from cover. Engine ran fine last 2 times out, after having work done on the alpha outdrive (hit stump, broken gimbal ring). I replaced a stereo amplifier since then. Last Sun. the engine just turned over and over but wouldn't fire. How many switches, and fuses are there to be checked? Just need some ideas and what to look for that may cut the spark so the engine won't turn over. Shift interrupt switch? Run switch has been on. Checked all fuses under helm. Don't know where to proceed from here. Any suggestions would be appreciated, thanks. (I'm 95% its a spark issue not fuel, no spark from coil.)

 

[slothman]

Re: Mercruiser 5.7 2001 EFI no start

first test the battery.

 

[Rugby Lock]

Re: Mercruiser 5.7 2001 EFI no start

Is it getting fuel?
You could unplug a spark plug wire and lay it close to a bit of grounded bare chassis or body metal, have someone crank the engine and watch to see if it sparks.

 

[dmlinn]

Re: Mercruiser 5.7 2001 EFI no start

Dual Batt. both good +12v

 

[alldodge]

Re: Mercruiser 5.7 2001 EFI no start

Is your EFI a throttle body or MPI it makes a big difference in troubleshooting? Look on the starboard side of the engne above the starter for the ID plate. The serial number should be on it.

 

[dmlinn]

Re: Mercruiser 5.7 2001 EFI no start

its a throttle body. After looking at it some more, it seems the coil is not getting power, and the fuel injectors are not putting out fuel either. Is there some kind of safety switch that prevents these things from not working. The coil is good after testing, but no power to the coil.

 

[Fun Times]

Re: Mercruiser 5.7 2001 EFI no start

After looking at it some more, it seems the coil is not getting power, and the fuel injectors are not putting out fuel either.

As in no 12 volt power to the purple wire / + side of the coil?

Does the gauges fire up at key up?

Maybe a bad relay of fuse on the engine or make sure to re-toggle the safety lanyard switch.

With an engine serial number someone may be able to set you up with the ignition diagnostic test tree found in the service manual to follow along with.

 

[dmlinn]

Re: Mercruiser 5.7 2001 EFI no start

serial #M094907

 

[dmlinn]

Re: Mercruiser 5.7 2001 EFI no start

Guages are on.

Anybody know if there is there a fuse or circuit breaker near the starter that's hard to see?

 

[alldodge]

Re: Mercruiser 5.7 2001 EFI no start

Guages are on.

Anybody know if there is there a fuse or circuit breaker near the starter that's hard to see?

There is a 90amp fuse connected to the starter. Here is a link to service manual No. 24 which is downloadable, and on page 91 is the TBI-V troubleshooting guide

http://www.maxumownersclub.com/forum/site_files/manuals/mercruiser/24.pdf

 

[dmlinn]

Re: Mercruiser 5.7 2001 EFI no start

Took it to my mechanic, it was a sensor in the distributor.

 

[Fun Times]

Re: Mercruiser 5.7 2001 EFI no start

Took it to my mechanic, it was a sensor in the distributor.

Thank you for the update. The sensor would have been my just throwing parts at the engine guess/advice without doing any testing. But the correct way to find it/inform you would have been to advise you to follow the test procedure found in the service manual provided above.

Happy Boating.