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Old 08-28-2013, 09:25 AM   #1 (permalink)
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Unhappy suzuky samurai gets off randomly wheb its warm

I have a samurai 87 , well we just overhauled it.. Actually all the mechanic parts are working awesome it is a 1300 cc motor, normal ignition... The thing is that after we did it, it worked pretty well kinda 100 kms.. But after that has been turning off randomly when the motor gets warm... The curious thing is that when it gets cooler it starts normally like nothing has passed...

I already checked all the electrical wires, changed the fuel pump tried with an electric one, changed the starter, the ignition module, actually everything i thought was the problem... One after other... And it keeps doing the same thing... It gets warm.. It turns off...

To be truthful im already freaked out about it... I dont know what else it could be. Mmmm i also checked all the physical (-) connections and everything is fine... I hope someon could be the light at the end of the tunnel here... Lol...

Last edited by iorantes; 08-28-2013 at 09:27 AM. Reason: word spellig correction
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Old 08-28-2013, 11:49 AM   #2 (permalink)
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Narrowing down the cause of this no-start condition to either no fuel or no spark will give us a place to start by process of elimination.

I'm assuming that this is still a carburetor equipped vehicle and fuel filter has been replaced. The following does not apply to fuel injected vehicles.

When the car is warm and refuses to restart, is there an odor of fuel?
When the vehicle is warm is the choke open?
Have you checked the physical condition of the fuel lines for kinks or damage between the tank and engine?

What did the mechanic that did the overhaul say about it?

First thing to do is to get it warm until it shuts off and refuses to restart...
then check for fuel at the carburetor.
you can look down the barrel of the carb and pull the throttle linkage to see if it squirts a little stream of fuel down in there. If you shine a light down there you should see it wet with fuel. Never put your face by the carburetor if there is anyone behind the wheel, key should be out just for safety.

Come back and post the results.

Last edited by caseyjones955; 08-28-2013 at 11:55 AM.
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Old 08-28-2013, 10:27 PM   #3 (permalink)
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Hey casey.. Thak you for answering.. So here ia the thing...

Yes it is a is a carburetor equipped vehicle and yes.. The fuel filter has been replaced already.

Yes when the car refuses to start ut has an odor of fuel but is an odor of not burned fuel
There is no damage between the tank and the fuel pump and from the pump to the engine neither... And yes the choke is open...

the mechanic states that is an electric issue so i hired an electric technician he checked all the wire lines and states that everything is ok.. He even made me buy the ignition module and change the coil... So actually thats why i dont know what to believe or to guess about the issue...

and yes it has fuel at thw carburetor when the issue is happening... I also guessed it and tries with an electric fuel pump and the problem persists...
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Old 08-29-2013, 02:01 AM   #4 (permalink)
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I'm looking at a schematic I here and its still showing an ECM under right side of dashboard. I see something about a fuel cut system in the ECM for carb equipped vehicles and several tests someone can perform with a multimeter. Is this ECM under the dash what was replaced or the ignitor in the distributor?

Do you have access to a repair manual for this vehicle? If not you can download one here with a ton of other good reading like a few TSBs (tech service bulletins) for stalling/loss of spark etc. Ack's FAQ Site Map

When it gets hot and dies does it die immediately like turning off the switch or does it buck, sputter or loose power before dying?

I hope someone with more electrical or carb equipped Samurai knowledge than I can chime in with more specifics testing and troubleshooting this system. Some of the tests I see in the manual would be very difficult to articulate here. If you get no other bites I will see if I can scan some pages of my Chiltons manual and email them to you.

Dont loose hope, every issue has a solution.

Last edited by caseyjones955; 08-29-2013 at 02:06 AM.
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Old 08-29-2013, 08:46 AM   #5 (permalink)
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Yeah that one is the one we replaced in the distributor... Np i dont have any manual im gonna download some.. Thanks for the interest in my case...

Noup it doesnt dies... It still has switch and the starter motor works pretty fine.. But the (-) terminal gets hot too... Thats why im guessing about a physical ground or a resistance connected to the block... Anyway im gonna spend an entire day looking at it and im gonn tell you what can i see...

Thank you casey...
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Old 08-29-2013, 08:49 AM   #6 (permalink)
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Check the distributor shaft side play. I had a similar problem with a motor change. Turned out to be the distributor would work fine in one engine, but not the other. Changed coils and parts back and forth, with no sucess. turned out the shaft bearings and drive gear were worn enough, that the distributor would work on one motor, but not the other. The air gap would open up after the motor warmed up and the pickup was to far away from the shaft to work properly. Maybe, same on yours?
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Old 08-29-2013, 09:47 AM   #7 (permalink)
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Not a bad idea to make sure all the grounds are nice and clean.

Your welcome for the help. I received a great deal of help on this board so I hope to give back where I can. Most of my experience is VW, Benz and early American cars. Much of it applies nicely to Suzuki but the rest has been because people here that know more than I do have been very kind and giving with the wisdom.
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Old 08-30-2013, 12:04 AM   #8 (permalink)
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has your carburetor been overhauled? There's a whole basket of goodies that could be causing a shut down in your carburetor. Everything from sticking floats and needles, to a broken micro-switch on the idle jet. There are also a bunch of vacuum lines that have valves and switches that can go bad over time. The hot idle compensator, the fuel mixture control valve, the thermo coupler on the air filter. If just one of these things goes south on you, it may not be catastrophic, but with an old carburetor, it's rarely just "one thing" that's having problems.
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