95 dt150 help please

[Solarman]

dt 150

The low pressure fuel pump is located on the side of the block just above the gas filter bowl on the same side, the parts page lists it as fuel pump. The common problem with this pump is the check valves coming apart and getting in the way of the needle valve in the vst where the float is. The check valves are under the diaphragms in the base next to the block. They do not show the check valves, and from my experience you can't buy replacement check valves. And unless something has changed, they are not offered in a rebuild kit.

[dkshooter]

thanks for the reply and help
I have a digital copy of the manual now but it is very fuzzy I have pulled the flywheel so I could get the correct wire colors they are g-b/r and w/r-w/bl according to the manual they should read 62-92 and 385-575 mine reads 86 and 517 so I assume these are ok.
you said something about the low pressure fuel pumps and check valves I looked and the parts breakdown and it does not show these where are they located?
thanks again

[Solarman]

running issues dt150

DK, I don't believe the batt charging coils have anything to do with getting your engine over 2K rpms. Their purpose is charging the batt. If the batt was dying/ having to be charged all the time it might. What are the conditions of the other coils? Can you get the wiring diagram for your engine? Need to know the colors of the high & low speed coils. then you can test them. When will you get your manual?
Waiting to hear.

[dkshooter]

runs well up to around 2000 rpms in gear in the water but that's is all its got as I advance the throttle there is no response. I can get it above the magical 2000 rpm mark when it is not in gear

solarman
since I have no reading on the charging coils would that keep the motor from topping out? and what should the meter reading be?

[newt5005]

Has any there been any evaluation on the prop?
Running well on muffs, no power when in the water (under load).
Just asking.

[Solarman]

dt 150 running issues

The ohm readings for the
Gear counter coil 227 &
3 timing coils 230 / 228 / 229
These seem to be good readings.
The batt charging coils should not be 0's
Also, there appear to be 2 condenser charging coils in the parts diagram. One is your low condenser charging coil, the other should be the high condenser charging coil. maybe Legacy S. Can tell you which wires go to the low speed charging coil, and which wires go to the high speed coil. Each set of coils have 2 wires. The low and high speed coils should be near the front / starter area, they look different than the batt charge coils.
The condition of all of these coils is important too. If rusted out badly, or the mounting clamps loose/ rusted out then they may give good ohms readings, but could give false readings during running. I have had gear counting coils read good but be splitting from rust, actually falling apart. The gear counting coil has to be mounted a specific distance from the teeth (adjustable) of the flywheel (it counts each tooth as it passes). The timing coils are fixed mounts, if the clamps are good and screws are tight they're ok.
You're having problems with high speeds, so your low speed condenser is probably good. check the high speed coil.
If all is good, then check the low pressure fuel pump, there are a couple of small plastic check valves that cause a great number of problems.
And Legacy synthetics seems to have the manual and can give the wire colors, and proper distance for the gear counting coil.
Good luck and let us know what you find.

[dkshooter]

results

OK guys
here are the results of the tests I have taken I am currently waiting for my copy of the shop manual.
the ohm reading on the following
gear counter 227
pulser coils 230,228&229

charging coils (ohms) the flywheel is off
0,0,0

condenser coil 545 w/bl-w/r

tvs ohms
to tvs 4.37 ohms
to the ignition 1.45 ohms
with the ignition on the reading was
4.98 volts

the gauge,when the key is turned on shows only the limit light



I hope this makes some sense please let me know what other tests/questions I can answer to help

thanks

[Solarman]

dt 115, 140, 150 EFI's

I would check the timing coils and the gear counting coils, and magnets under the flywheel. If these items check then I'd go to through the fuel system on the motors.
The gauge if working should flash if there is a problem with sensors. If the timing coils or great counting coil is bad, the ECM will get the wrong signal, and it will be in limp mode.

[LegacySynthetics]

I am having what sounds like the same exact problem with my 1993 DT150S EFI.

I have checked almost all the sensors. Only sensors I have left are the oil sensors. So have fuel side to check as well. Fuel pressure, regulator operation, pump checks.

Here is what I found so far.

Ignition coils(two spark plug ones) no resistance reading between the feed wire and plug wires. Dont know if this is right.
The feed wire and ground reads .05 ohms.
Two plug wires read 16K up to 29K ohms tested between the two of them.

The V1 for the TVS (throttle valve sensor) is reading .5volts dc. Manual says it should read 3.9 to 4.6. So if this is right I have an ICU(ignition control unit) thats bad.

Test your TVS by turning ignition on disconnect TVS set multimeter to DC volts (black meter wire to black wire on connection, red meter wire to brown/white stripe wire. What is that reading that is your V1).

Also I do agree, this forum seems slow to respond or answer. Someone on here has to be a Suzuki Outboard Certified Mechanice that can explain all the specs and test procedures. And if they have ever seen this before.

[dkshooter]

sorry for making this in 2 posts but I have done so much to this motor I really cannot remember it all I did clean the VST and replaced the high pressure fuel pump I am not sure how you check the timing coils and the gear counting coils, and magnets under the flywheel? I am afraid that I don't trust the gauge.

thanks again!

[dkshooter]

help?

yes mine is a efi I just got back from the river still not able to get past 2000 rpms with the sensors disconnected. last year I purchased a new ECM when installed the motor toped out great for about 30-45 sec. then back to 2000 rpms please let me know what other questions I can answer


thanks guys you have no idea how frustrating this is

[Solarman]

dt150 running issues

Will add that your problems could be as simple as a TPS sensor.
It is helpful to mention the specifics of your motor, when using a forum for help. If either of your motors use carbs instead of EFI, then many things are different.
The gauge is a vital link in the system and if not working could be a part of the problems.
The ECM could be at fault, but would be one of the last on my check list.
Good luck, but remember, those of us on this end of the forum operate from your descriptions, we can't put our minds on the problem without your help.

[Solarman]

dt150 running issues.

Peter, & dkshooter it sounds like you might have fuel issues, but could be timing related. I am guessing both these motors are EFI's. I would check the 2 timing coils and the gear counting coils, and magnets under the flywheel. If these items check then I'd go to through the fuel system on the motors. The VST, and both fuel pumps (low & high pressure). The gauge is important if you have a sensor that's bad, but as keaker said, don't bypass.
Have to go for now. Use the Manuel, and follow the test procedures.

[keakar]

you cant just go around disconnecting sensors like that, if they are bad replace them, if not then find the problem causing them to signal the engine is in trouble. they are there to keep you from damaging the motor so find and fix the problem don't just bypass the safety devices protecting the motor.

it may be a bad ECM or something as simple as corroded connections giving false readings or even a short in the wiring harness.

I know this doesn't tell you "go here and do this" but its the best answer I can give you with the info you presented.

and don't poo-poo the forum here, just because no one has an answer for your problem doesn't mean no one wants to help you.

get a good factory service manual for your engine and follow the step by step trouble shooting procedure until you solve your problems.

[dkshooter]

ditto

peter
I have had the same problem now for 3 years and have no idea PLEASE tell me what you found out!!!!!!!!

thanks