Unicarriers (& Nissan) CPJ01A15PV:
Machine will not run unless choked down.

I have a Nissan CPJ01A15PV that will only run if you place your hand over the air horn and cover approximately 80% of the horn. If you remove your hand it dies. I have checked the distributor vacuum advance with a manual hand vacuum pump. It doesn't leak down which leads me to believe that the diaphragm is good. I have removed the vacuum fuel lock off and replaced it with an electric one. Still no change. The LP converter has been replaced twice. Same result. The carburetor/mixer has been replaced. I can't find any source of a vacuum leak. There is a switch of some type that has a vacuum hose going to it and wires connected to it. I don't know what that switch does but I put the vacuum pump on it and a volt meter and all indications show that it is working and has no torn diaphragm in it. I am at a loss at this point. I would truly appreciate it if somebody could tell me what is wrong with this machine.
  • Posted 3 Aug 2022 07:21
  • Discussion started by MICHAEL_JONES
  • Mississippi, United States
Showing items 1 - 9 of 9 results.
Didn't think of that one yet. Glad you found it.
  • Posted 16 Aug 2022 06:55
  • Reply by meliftman
  • Alabama, United States
Liftman
Retired
Elberta, Al.
Governor spring broke.
  • Posted 16 Aug 2022 06:07
  • Reply by grant_c
  • Manitoba, Canada
You said you have replaced the mixer but is it working correctly? Looking into the barrel while turning the engine, it should pulsate.
  • Posted 13 Aug 2022 22:19
  • Reply by meliftman
  • Alabama, United States
Liftman
Retired
Elberta, Al.
Have you measured engine vacuum at an idle? Or engine exhaust back pressure? Engine timing with a timing light or verified by timing marks? Ive seen restricted exhaust and incorrect timing cause this problem in the past.
  • Posted 13 Aug 2022 11:21
  • Modified 14 Aug 2022 05:55 by poster
  • Reply by BLey
  • Ontario, Canada
I have taken the vacuum lock-off off of it and replaced it with an electric one to try to eliminate that possibility. That didn't change anything.
  • Posted 12 Aug 2022 01:43
  • Reply by MICHAEL_JONES
  • Mississippi, United States
Does it look like that vacuum switch goes directly to manifold ? then just jump that out and see what happens ? maybe it is defective ?
  • Posted 12 Aug 2022 00:05
  • Reply by stillworkin
  • New York, United States
One component not mentioned is the lock off. If unit has vacuum lock off, it can be causing this issue. Will it run if you remove the air filter?
  • Posted 10 Aug 2022 23:25
  • Reply by meliftman
  • Alabama, United States
Liftman
Retired
Elberta, Al.
Yes I did. Everything looks good on compression. Also did cylinder leak-down test. No problems there either.
  • Posted 10 Aug 2022 02:35
  • Reply by MICHAEL_JONES
  • Mississippi, United States
Have you done a compression test? Low compression can cause the engine to not draw enough fuel to run until choked.
  • Posted 5 Aug 2022 03:36
  • Reply by meliftman
  • Alabama, United States
Liftman
Retired
Elberta, Al.

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