Fuel injector cleaning

 A question for you car mechanics please, who deal with this stuff regularly

Cleaning of petrol fuel injectors-what works and what doesnt?
Im not talking tipping 200mls of wonder juice into the tank, rather insitu such as Carbon Clean or removing for cleaning.
My Suzuki outboards have close on 1000hrs, and probably due for a look but not keen to replace them for $250 eash x 8 = $2K

Anecdotal but I reckon Im using more juice than before (or maybe carrying more shit!) at the islands and reckon Im about 200rpm down at full bore.

Otherwise they start, run, idle and load up perfectly.

I know there are plenty of reasons to lose a little top end including cable adjustment, filters, prop damage etc

But just after some specific injector advice
 

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The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.

 


scano's picture

Posts: 1023

Date Joined: 31/05/07

You will probably find

Fri, 2018-06-08 21:55

 It is more a carbon build up within the cylinders than anything that has the effect you describe. For starters, rum some f10 fuel addative, local product and seems to work well. Also, be sure to give the throttle bodies and inlet manifold some carby cleaner love. Lastly, some new plugs will make a difference. 

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Rob H's picture

Posts: 4808

Date Joined: 18/01/12

For sure there will be carbon

Sat, 2018-06-09 00:10

For sure there will be carbon buildup in the combustion chamber but I don’t know that anything will remove that other than physically, maybe I’m old school?

Plugs are done regularly at $6 each or so, and recently.

All a beautiful tan colour across all.

Carbon Clean, does anyone have any actual real world experience of its success or otherwise?

Intakes, I may just pull one off for a look but I wouldn’t be expecting them to be clogged as they don’t have an egr system afaik?

Injectors, and possibly fitting and plugging in the oxygen sensor as per service manual.

May just pull the injectors on one outboard and clean, to see if there is any difference?

____________________________________________________________________________

 Give a man a mask, and he'll show you his true face...

 

 

The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.

 

Posts: 13

Date Joined: 28/10/17

 Used to send my suzuki

Sat, 2018-06-09 08:41

 Used to send my suzuki injectors off to an automotive shop for a proper injector clean - used to cost around $30-40each from memory as they have the proper tools to do so and for that price it was easy. Made a huge difference if the fuel system had water or stale/old fuel go through it.

On top of this have a look at your owners manual - at 1000hrs they reccommend replacing the high pressure fuel filter. for $150 or so it too makes a difference as they get on with age and could be a cause for fuel delivery at the higher RPM. Do all this along with the low pressure fuel filter and you should be happy days.

Rob H's picture

Posts: 4808

Date Joined: 18/01/12

 Yeah I have a pair of HP

Sat, 2018-06-09 08:57

 Yeah I have a pair of HP filters to go in, they also say that it should have the oxygen sensor plugged in via the Diagnostic program to adjust the fueling but I doubt if anyone bothers.

Will attack it when I get home from sea in a couple of weeks, ready for school holiday island trip 

____________________________________________________________________________

 Give a man a mask, and he'll show you his true face...

 

 

The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.

 

Cruise Control's picture

Posts: 861

Date Joined: 03/11/10

 Hey RobA couple of seasons

Sat, 2018-06-09 11:45

 Hey Rob

A couple of seasons ago I had all sorts of problems with my Yammies. They were constantly stalling when coming down off revs to idle. This was despite long runs at moderately high speeds. It certainly made for interesting times when I was coming into the jetty with often both motors stalling at the critical time. I ran a whole bottle of F10 through it over 2 tanks with little if any improvement.

I had Brett Ward look at it and the first diagnosis was fuel/air mix sensors. These were replaced and the problem reduced slightly but I still had irregular stalling when returning to idle on both motors. I was also running about 400 RPM down on what I would normally get at WOT. I left it with Brett asking him to not return it to me until fixed.

It ended up being that the motors were choked with carbon. Brett put some type of cleaner through each motor by squirting directly into the cylinders and letting it sit for 24 hours. On starting them up he reckoned that it spewed out that much shit that he whacked another can in both with the same result. After 4 cans in each it came up clean.

First run out, no stalling and back up to 5800RPM at WOT. Haven't looked back since. I now have Brett put a can through each motor every service and have not had a problem.

Dunno if you might have a similar problem but it could be worth a try. I'm  only up to 780 hours so a long way from your 1,000 but you never know.

Rob H's picture

Posts: 4808

Date Joined: 18/01/12

 Thanks Bruce, I think I know

Sat, 2018-06-09 16:54

 Thanks Bruce, I think I know the stuff you mean

____________________________________________________________________________

 Give a man a mask, and he'll show you his true face...

 

 

The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.

 

Scotte's picture

Posts: 880

Date Joined: 07/12/06

 Cruise control  do you do

Sat, 2018-06-09 17:32

 Cruise control  do you do  alot of idling around or drift fish in neutral.

Cruise Control's picture

Posts: 861

Date Joined: 03/11/10

Scotto, no not really, other

Sat, 2018-06-09 17:59

Scotto, no not really, other than when sign posted at 5 knots but even then, I'm 1200 - 1300 RPM. Usually I'm up to cruise speed as soon as I can 23 - 25 knots.

i thought it odd that there was so much crap in it as I usually run 95 octane as well for a cleaner burn.

Scotte's picture

Posts: 880

Date Joined: 07/12/06

 Yeah really  odd for  both

Sat, 2018-06-09 18:16

 Yeah really  odd for  both motors sub 1000hrs