Slow warmup 130 Johnson

[1997 cajun]

I have a 1996 130 Johnson that seems like it takes for ever to warm up. Once its warmed up it runs great. I was thinking the thermostates maybe need replacing.It starts ok but takes about 20-25 mins before it will run at max rpm's. Any ideas?

 

[Dhadley]

Re: Slow warmup 130 Johnson

Welcome!

If it comes out of Quick Start within a minute or so the T-stats are most likely OK. Even if the T-stats were stuck open the motor will reach full rpm's without a problem. It'll just idle high.

Elaborate on the issue. Is the motor running on all 4?

 

[1997 cajun]

Re: Slow warmup 130 Johnson

I start it and run it very slow for about ten minutes and then try to accelerate and it will only hit about 3000 rpm?s so I back off and putt around for another 10 minutes and try it again and it still seems like it does not want to go. After about 25 minutes it will finally go. WOT it runs about 5800 rpm's. Runs great after it does warm up. Does this sound like its taking to long? My last boat had an inboard it was ready to go after a few minutes. I think its running on all four cylinders. It seems to run good once it warms up.

 

[Chris1956]

Re: Slow warmup 130 Johnson

Cajun, You can remove the thermostats and test them for proper operation. Put them in a pan of water on the stove. Suspend them in the water, and monitor the temp of the water with a candy thermometer. They should open at 140 degrees, if they are working properly.

If they are good, check the low temp sensor on the cylinder head. This sends a signal to the Quickstart system to keep the ign timing advanced until the motor is warm. if the sensor is not working properly, the quickstart will keep the timing advanced.

I really do not think your problem is caused by either of these problems. I would put a timing light on the spark plugs when the motor is cold and see that you have spark to all four. If not, I would check the SLOW system (and the high temp sensor on the head) to see that it is not activated at this time.

 

[ezeke]

Re: Slow warmup 130 Johnson

If your powerpack is good, QuikStart will disengage when the engine hits 1100 or so RPM, regardless of the temperature switch. Check for fire on all cylinders while the engine is cold as suggested.

 

[unutt]

Re: Slow warmup 130 Johnson

I have EXACTLY the same problem with my '97 200 Venom.

I have changed powerpak, VRO, and had carbs rebuilt. None of those made the slightest bit of difference. I confirmed with a timing light that all six plugs are firing when it is cold.

I took it to a shop to have it checked and they told me it was running great ($196 not too well spent).

The colder the weather, the longer it takes to kick in. Just as does 1997 Cajun's, mine will not achieve full power until it runs for awhile. Max rpm is about 3500. The first time it happened (October, 2005) I thought I had left the plug out and the bilge was full of water. If you have ever done that, you know exactly how my boat runs until it straightens up. It will eventually get on plane, but it takes awhile. Warm days, it only takes a minute or two, implying it is temperature related. Unless it is a really cold day, I have no more problems all day. Next morning, exact same problem. When it kicks in, it feels like I cut the rope on an anchor. Slingshot might be another description.

How might I check the SLOW system? It actually feels as if something is controlling the rpm.

unutt (also in Texas)

 

[reeldutch]

Re: Slow warmup 130 Johnson

even with the motor cold it should run all the way to max rpm.
saying that, if you think your motor runs cold put a temp gun on the top of the head were the tstats are and it should be around 145.

i think something else is going on.

could be 1 cylinder not producing.
spark
fuel
compresion

 

[unutt]

Re: Slow warmup 130 Johnson

I reread my post and realized I might have confused the issue.

The boat does not run cold. It simply will not run correctly when it IS cold.

When I first start the boat, I cannot make it achieve any rpm above 3500. After some warming period, it runs perfectly. The amount of warming required depends on how cold the ambient temperature is. On a cold day, it might take 15 to 20 minutes of running. On a really warm day, it might only take a minute or two.

When it finally does 'kick in', I can feel it. The tach will jump from 3500 to 5500 in a few seconds. The boat literally lurches forward from about 35 or 40 mph to 60 or 65. For the remainder of that fishing day, the boat runs fine. Starts right up, and accelerates quickly. Next morning, exact same thing.

This issue does not seem to be affecting the start up, though, it has always been a bear to start, so it might be difficult to judge.

Everything I read in the shop manual says powerpack, but installing a new one had no effect.

I am not sure how fuel or compression would be improved by warming up. I am not completely sure how spark would be affected.

The only thing I know to do at this point is to start prewarming different components until I find the guilty culprit.

Any other ideas would (obviously) appreciated.

 

[Chris1956]

Re: Slow warmup 130 Johnson

I still think you should test your thermostats and heat sensors for proper operation.

 

[reeldutch]

Re: Slow warmup 130 Johnson

all im saying is that even if yoiu dont have tstats in them and the engine will never get warmed up you still should be able to run the motor at high rpm to 5500.

you should not do it bud the motor can do it.

so i think you have an other isseu going on.

 

[Chris1956]

Re: Slow warmup 130 Johnson

Reel, While I agree with you that there is likely other issues. If he eliminates the thermostats and heat sensors as the issue, he will have narrowed the problem domain. it may turn out to be some flaky S.L.O.W. problem or an even flakier Quickstart issue. At least the 'stats and the sensors are easy to check and cheap to replace compared to the power packs.

 

[Dhadley]

Re: Slow warmup 130 Johnson

It seems like a discription of an ignition problem rather than a t-stat issue. Running on less than all cylinders and then as the components warm up it'll hit on all. Even if the t-stats are out it'll hit (either the 4 or 6 cylinder) 5800.

Unutt talks about his "kickin in". T-stats don't act like that. A missing cylinder that suddenly fires does.

 

[ezeke]

Re: Slow warmup 130 Johnson

"It seems like a discription of an ignition problem rather than a t-stat issue. Running on less than all cylinders and then as the components warm up it'll hit on all. Even if the t-stats are out it'll hit (either the 4 or 6 cylinder) 5800.

Unutt talks about his "kickin in". T-stats don't act like that. A missing cylinder that suddenly fires does"

"all im saying is that even if yoiu dont have tstats in them and the engine will never get warmed up you still should be able to run the motor at high rpm to 5500.

you should not do it bud the motor can do it.

so i think you have an other isseu going on."


I agree with these suggestions.

 

[kenmyfam]

Re: Slow warmup 130 Johnson

Had a 60hp twin Evinrude many years ago that gave the same symptoms. Turned out it was a dodgy powerpack. Changed it up and ran well again.....till the other powerpack did the same thing.

 

[Chris1956]

Re: Slow warmup 130 Johnson

I think the objective is to find out why it takes so long to warm up, which points to the thermostats, and why it won'r rev up, which points to the ignition system. The heat sensors cause the motor to rev up,(Quickstart) if they detect a cold condition. alternatively, the overheat sensor kills a bank of cylinders, if it detects an overheat condition (SLOW). I fyou eliminate the thermostats and sensors as an issue, and you still have the problem, it points to the powerpack or other ignition.

BTW - You might check the yellow-red lead that runs from the starter solenoid to the power pack. Power on this lead occurs while cranking the starter, and causes the powerpack to fire on battery voltage, and also activates the Quickstart.

 

[reeldutch]

Re: Slow warmup 130 Johnson

so whats the temp of the motor after quickstart deactivates?
or say after 5 minutes idle?
point a temp gun om the top of the cylinderhead and verifie its indeed cold or warm.

i think the objective is to find out why its not getting wot at 5500.

and i would also do a cylinder drop test to verifie all cylinders are producing power.

thats my 2 cents

 

[Chris1956]

Re: Slow warmup 130 Johnson

OK, I just looked at my service manual. It says that if the motor stays in the SLOW mode (Max RPM 2500), you need to check the temp sensors and the blocking diode in the harness. That motor has about three main Amphenol connectors on the port side of the motor. You will find the diode on the tan wire in the harness between the sensors and the main connector that contains the tan wire.

Do you know how to check a diode?

BTW the shift interrupt switch also has a blocking diode in it's harness. However that wire is black/yellow. You might check that one as well, since if that diode is bad, the shift interrupt switch will kill ignition, and maybe kill spark to one bank of cylinders

 

[ezeke]

Re: Slow warmup 130 Johnson

BTW the shift interrupt switch also has a blocking diode in it's harness. However that wire is black/yellow. You might check that one as well, since if that diode is bad, the shift interrupt switch will kill ignition, and maybe kill spark to one bank of cylinders

FYI: There is no shift interrupt on a V4.

A dead diode does not just go away when the engine warms up.

Is there any chance tht someone has messed with your timing?

Get a heat gun or hair dryer and warm the ignition coils, one at a time. You could have a bad coil.