1997 225 EFI Cold Idle **RESOLVED**

[cousinabe]

1997 S225TXRV
No winky blinky codes other than 33 during warm up, then to 1.

Motor currently idles at 730 when warm and 850-900 when cold. I know it should be 1200 when cold - what should I check for this?

New low pressure pumps, new VST filter, pressure reads 35psi, new spark plugs.

 

[JUSTINTIME]

Re: 1997 225 EFI Cold Idle

Re: 1997 225 EFI Cold Idle

tps checks fine?

 

[cousinabe]

Re: 1997 225 EFI Cold Idle

Re: 1997 225 EFI Cold Idle

Thanks for your quick reply.
yes. i performed the link and synch per manual.

Throttle Valve Synchronization:
disconnected linkage.
turn throttle set screw till free. i did not count how many turns out.
performed adjustment steps for throttle valve opening.

verified/set tps at .52v
re-connected linkage.
start engine and let warm up for 10 min. motor idled at ~500 rpm.
set throttle set screw so motor would idle ~730rpm. tps was then at .62v

I did not perform Throttle Valve Pick-up Timing because the roller/cam alignment looked fine.

 

[JUSTINTIME]

Re: 1997 225 EFI Cold Idle

Re: 1997 225 EFI Cold Idle

check the timing

 

[cousinabe]

Re: 1997 225 EFI Cold Idle

Re: 1997 225 EFI Cold Idle

between TDC and 2 ATDC

 

[cousinabe]

Re: 1997 225 EFI Cold Idle

Re: 1997 225 EFI Cold Idle

I have ordered new spark plug caps. Only a few of them had the proper resistance. What are the symptoms of bad spark plug caps?

I am also looking into fuel issues. I have recently changed the fuel water separators, low pressure pumps and vst filter. I will be changing the fuel filter element on the motor soon as well.

My service manual shows a fuel pressure regulator filter/screen that i plan on cleaning.
I have also read other posts about fuel injector filters, but my manual does not mention these at all. Do they exist for this motor?? If so, are they easy to clean?

Thanks.

 

[cousinabe]

Re: 1997 225 EFI Cold Idle **RESOLVED**

Problem seems to be resolved.
I replaced all spark plug caps. Only 2 of the six had proper resistance.
Replace fuel filter element. It was the original.
VST filter, low pressure pumps and fuel water separator filter were replaced earlier in the season. Verified vacuum and pressure on low pressure pumps. Verified high pressure pump holding between 35psi.
Cleaned the pressure regulator screen on the VST. Blasted with carb cleaner.
Cleaned the fuel injector screens. They looked clean, but soaked them in Seafoam and blasted with carb cleaner.
Performed link and synch.
Adjusted oil pump rod to .005. Had to cut off 5 threads from the linkage rod.
New spark plugs. The old ones looked a little wet fouled.

O2 sensor was cleaned earlier this season. I still need to check the output voltage to make sure it's within spec. I cleaned it by soaking it in Seafoam. Only submerged to the threads.

Will post if things change.

 

[ghind]

Re: 1997 225 EFI Cold Idle **RESOLVED**

Thanks for sharing with us.

Which thing do you think fixed it?

 

[cousinabe]

Re: 1997 225 EFI Cold Idle **RESOLVED**

I think checking/replacing the spark plug caps and plugs made a difference. I'm not sure what the symptoms are on out of spec caps though.

I replaced them all @ 10.60ea.
http://www.boats.net/parts/search/Yamaha/Outboard/1997/S225TXRV/ELECTRICAL 2/parts.html

I wasn't sure if E10 had a part in this either. The motor has been acting weird like this for the past three seasons, so I went through the fuel system and every filter/screen to make sure all were clean. My next steps were to send the fuel injectors to Flagship for testing/cleaning.

Since the winky blinky was showing no codes, I think going through all of the fuel and ingnition system checks were essential.

 

[ghind]

Re: 1997 225 EFI Cold Idle **RESOLVED**

I used to own a 97 Vmax 150 carb. It ran great except when towing two barefooters for more than about a minute. It would drop back a lot in power.

Went through everything and it turned out it was a broken down plug cap. It measured 12K ohms when it should have been about 5k. It didn't affect the idle. I understood that it only happened under maximum load as the spark has trouble jumping the gap at maximum compression.

It took forever to find. In the end, I found I could duplicate it by making the engine labour. Motor trimmed right down and full throttle 4700rpm up and down the river a couple of minutes until it did it. Once it could be repeated we could try things and fixed it.

Thanks for sharing your story.

 

[cousinabe]

Re: 1997 225 EFI Cold Idle **RESOLVED**

Thanks for your feedback.

I actually have twin motors S225TXRV and L225TXRV.
Both have been acting quirking for the past three seasons.
Any thing from lean sneezes at initial cold start, poor idle, sporadic high fuel consumption on port engine and varying rpms ~300 drops at cruise on port engine.

Both engine have ~525hrs.

Since there were no codes, I went after fuel and ignition issues.
Maybe since the plug caps were bad, it was causing the plugs to be wet/fouled and the engine would then compensate for a rich condition??

I still need to test my 02 sensor output.

I does seem to run a lot stronger now. I took it out for 40 minutes and did not see any rpm fluctuations at cruise rpm 4000-4500. It ran well.

Also what I found interesting is that my throttles were not in synch before, I would have to keep the port one up a little further to maintain synch rpms. That seems to be resolved as well.

 

[cousinabe]

Re: 1997 225 EFI Cold Idle **RESOLVED**

Update:
My high fuel consumption on my port motor has gone away after replacing the four wire O2 sensor.

Both motors are running perfect!