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TOPIC: 2006 mercruiser 3.0 TKS running problem

2006 mercruiser 3.0 TKS running problem 16 Apr 2017 01:08 #1

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Need help! starting motor when cold normally with 1100 rpm. when heating up rpm going down to 750 starts working roughly, when I slowly try to accelerate engine shuts off. what is the problem could be?

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 02:00 #2

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Got the same problem on my 5.0 today, first time out since october. I am going to try to do the simple things first, replace the fuel filter, check for vacuum leaks. I've already replaced the enrichment module a couple of years back. Check yours (if you don't have one check if the choke is sticking). Clean with carb cleaner. I will keep you posted on my progress, getting the filter tomorrow.

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 02:13 #3

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So is your motor running at 1100 rpms cold and then dropping to 750 after about 8 minutes? I would say that the TKS module is fine. You have another issue. Possibly bad gas, spark plugs or a vacuum leak. Try some Seafoam in the fuel tank for starters.

Mike
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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 02:27 #4

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dogovorilis.lol

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 09:36 #5

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Engine should idle around 600-650 any higher shifting and running will be a problem.

Tks has a solenoid ... while running shoot some carb cleaner down the throat of the carb when the engine wants to quit stop, allow the engine to recover then do it again and again.

Sounds to me the solenoid is not opening all tthe way just like a choke carb / but with the tks system that i hate.

The piston on the solenoid could be gunked up, or the solenoid went, or is going.

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 12:50 #6

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I ll try that. Thank You. Should i keep rpm high or just idle?

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 14:55 #7

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Start with 600-650 rpm cold,running rough,short spray carb cleaner, start running perfect then shuts down and every time i spray into carb runs perfect then shuts down again.....maybe just some spark plugs problem or fuel pump.....

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 15:44 #8

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If the motor is only running at 600+ rpms at the cold start I would look at the TKS module and it's piston. I had the same problem on my boat. The most likely culprit is the piston behind the plunger on the TKS module is stuck in its bore in the carburetor. You need to get some carb cleaner in there to loosen it up. Once you get it free again you will hear a hiss near the carburetor when you start your motor cold, after about eight minutes the hiss will begin to get quite then stop. At this time you should be at normal warm idle speed. Right now your TKS piston is stuck in the warmed up position, thus no enriched mixture and rpm when you start cold. I'm guessing that if you can keep the motor running long enough to warm up to normal running temps it will run like normal.

Here is a link to the Mercarb TKS manual that will tell and show you what I'm talking about,

boatinfo.no/lib/mercruiser/manuals/mercruiser41.html#/0

Mike

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 15:51 #9

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To get the carb cleaner to the TKS piston you will need to remove the TKS module and squirt the carb cleaner in the bore towards the piston that is stuck in there. I don't think shooting carb cleaner down the throat of the carb will reach this bore. I ended up taking off my carburetor and standing it on its side to let the cab cleaner soak into this bore which is horizontal when the carb is on the motor. You could also just remove the lid of the carb but that would be a little more involved but not much.

Mike

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 16:54 #10

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The issue is when the engine warms up. It starts running rough and stalls when put in gear.

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 16:57 #11

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I would think a carb rebuild certainly wouldn't hurt as well as running premium gas and additives...new plugs, fuel filter...has any of this ever been done since 2006? If not, I would think it is over due...imho

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 16:59 #12

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"Start with 600-650 rpm cold,running rough,short spray carb cleaner, start running perfect then shuts down and every time i spray into carb runs perfect then shuts down again"

This sounded to me like the motor would not run long enough to warm up. Maybe Lap could correct me if I'm not fully understanding what he is saying. If the motor has never been tuned up certainly it would not hurt, but that alone may not cure this issue.

Question, do you hear a hiss when you start the motor cold? Like a vacuum leak in the carb?

Mike
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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 19:44 #13

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Was going to check mine out today, but we got rain, will update during the week.

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 20:36 #14

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yesterday i could hear the hiss when i start, but today different picture complitly. could not even make engine run cold.

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 22:20 #15

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"Was going to check mine out today, but we got rain, will update during the week. "

Hey Crazy Russian, I think you might want to start a new conversation on your motor's issues. These two engines are completely different and should require different approaches. You will get more accurate help if you don't get mixed up in this troubleshooting effort for a 3.0 TKS.

Mike

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2006 mercruiser 3.0 TKS running problem 16 Apr 2017 22:25 #16

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"yesterday i could hear the hiss when i start, but today different picture complitly. could not even make engine run cold. "

Well if you did hear the tell tale hiss I would say that the enrichment circuit was working so you have a different issue. From personal experience I'd do a compression test as you replace the spark plugs. I had a bad valve on my head that caused me to spend way too much money on other non related items before I figured it out. It is very easy and could save you a lot of unnecessary parts replacements.

If you compression is good then a tune up and then a carb rebuild if necessary.


Mike
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2006 mercruiser 3.0 TKS running problem 17 Apr 2017 18:05 #17

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isn't the carb the same on the 3.0 and the 5.0? j1223?

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2006 mercruiser 3.0 TKS running problem 17 Apr 2017 21:45 #18

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2006 mercruiser 3.0 TKS running problem 18 Apr 2017 00:56 #19

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Look at the attached for measuring the operation of the TKS module

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2006 mercruiser 3.0 TKS running problem 18 Apr 2017 09:37 #20

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2006 mercruiser 3.0 TKS running problem 18 Apr 2017 12:19 #21

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flyman219 wrote: Hey Crazy Russian, I think you might want to start a new conversation on your motor's issues. These two engines are completely different and should require different approaches. You will get more accurate help if you don't get mixed up in this troubleshooting effort for a 3.0 TKS.

Mike, I agree!
Crazy Russian, the Merc 5.0L does not offer the TKS system as does the 3.0L engine. It would be best to start a new thread for your specific issue.

***************************************

Some of us are suggesting to spray carb cleaner down into the throat of the TKS carburetor.
Unless the spray cleaner is directed into the small metering air circuits, doing this will be futile.

Merc's TKS does not offer a conventional old school Choke Plate and Choke Chimney enrichment affair for temporary cold-start enrichment.
Instead, Merc's TKS incorporates a solenoid valve that opens up an enrichment circuit during cold-starts. This takes the place of a conventional old school Choke.

As Alen suggested, the enrichment solenoid valve may be sticking and/or needs to be replaced.

Read Mike's post #9.



crazy_russian wrote: This is an interesting read www.marineengine.com/boat-forum/showthre...-0-Carb(TKS)-problem

I am active at ME.com, and I remember that thread.





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2006 mercruiser 3.0 TKS running problem 18 Apr 2017 13:31 #22

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Yea that was me.

Sooooo ?

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Be good, be happy, for tomorrow is promised to no man !

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2006 mercruiser 3.0 TKS running problem 18 Apr 2017 13:48 #23

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Bounty,

Check this (from the same document), and don't call people imposters ;)

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2006 mercruiser 3.0 TKS running problem 19 Apr 2017 01:08 #24

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So I took my enrichment solenoid off and connected to a 12 V source. It extended and retracted within spec. Did you check yours yet?

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2006 mercruiser 3.0 TKS running problem 19 Apr 2017 01:15 #25

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So did the piston come out with the solenoid or did it stay in the bore?

Mike

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