auto by start testing

[kingsfisherman]

2003 Nissan NSF18B2

Hello all,

I am troubleshooting a possible fuel problem, hard to start once started rough idle and dies when given throttle.

-checked fuel filter it was good, changed out anyways

looking to test the auto by start, it has 2 yellow wires that go to connectors. 1 had a single connector to another yellow wire the other 1 has a double wire connector with a yellow and a black wire.

Am I correct in assuming the black wire is ground and I need to apply 12v to the single yellow wire to test the auto by start?

 

[pvanv]

When was the last time the carb was disassembled and cleaned? The ABS is very reliable, I have never needed to change one... but if you pull it out and apply 12vdc to the leads, it should warm and the needle should extend.

 

[kingsfisherman]

When was the last time the carb was disassembled and cleaned? The ABS is very reliable, I have never needed to change one... but if you pull it out and apply 12vdc to the leads, it should warm and the needle should extend.

Thank you Paul, I will be removing the carb and cleaning it once the gaskets and carb kit come in, but when I test the ABS by placing 1 wire on the pos. and 1 wire on neg posts of a battery nothing happens. It appears that the pin assembly is already extended because I can push it back against the spring.

 

[pvanv]

Does the ABS get warm at all? If not you are the 1 in a zillion who needs a new one. It works by heating a wax capsule, which expands and pushes the pin out. It is normal for the pin to "float" even when retracted.

 

[kingsfisherman]

Does the ABS get warm at all? If not you are the 1 in a zillion who needs a new one. It works by heating a wax capsule, which expands and pushes the pin out. It is normal for the pin to "float" even when retracted.

Alrighty then, the ABS does work. so onto a good cleaning of the carb. Thanks Paul

 

[km1125]

There's a fuel passage in the bottom of the bowl. It is VERY hard to clean out because it takes a 90 degree turn in there. This feeds the cold start and idle circuits, so when it's plugged you get the same symptoms. Took me a while of soaking and trying to get a wire through there to get it clean. Once clean it runs great. There's another thread on here with some pictures in it. If I have time I'll see if I can find it.

EDIT:
Here is the thread that has a picture of the bowl and shows the passage I'm referring to
https://forums.iboats.com/forum/eng.../10498442-no-start-problem-on-nissan-nsf-9-9b