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Another intresting CAV injector pump problem


 
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ptfarmer
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Joined: 01 Jul 2013
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Location: San Antonio, Texas

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PostPosted: Tue Sep 25, 2018 12:27 pm    Post subject: Another intresting CAV injector pump problem Reply to specific post Reply with quote

I ran into another CAV injector problem this time on my brothers 1965 MF150, for some reason now you have to give it about 1/4 throttle every time in order for it to start. Less than 1/4 throttle it won't start, it did this without any kind of warning, it started like it normally did then the next day no start without giving it 1/4 throttle. After you start it, and move the throttle lever back to idle it will idle with no problem, it just won't start with the throttle set at idle even if you shut it off at an idle, and instantly try to restart it.
 
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Phil Tibbetts
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Joined: 23 Jul 2004
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Location: Old Town, Maine

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PostPosted: Tue Sep 25, 2018 1:06 pm    Post subject: Re: Another intresting CAV injector pump problem Reply to specific post Reply with quote

Don't know anything about your problem but all

I have read or had experience with says to have throttle partially opened to 1/4 or so before starting.
 
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Dieseltech
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Location: Indiana

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PostPosted: Tue Sep 25, 2018 4:07 pm    Post subject: Re: Another intresting CAV injector pump problem Reply to specific post Reply with quote

Sounds like the metering valve is sticking, or idle speed is set too low.
 
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ptfarmer
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PostPosted: Tue Sep 25, 2018 8:32 pm    Post subject: Re: Another intresting CAV injector pump problem Reply to specific post Reply with quote

I turned the idle speed up a little bit still no difference. My brother has owned this tractor since 1975, and it never needed 1/4 throttle for to start (nor have I ever heard you needed to that). Going to put in some 2 stroke oil in the fuel to see if maybe that will help. I put some 2 stroke oil in my 135 that I had a problem with the injector pump (shut off when I gave it throttle), and so far so good.
 
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Phil Tibbetts
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Location: Old Town, Maine

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PostPosted: Wed Sep 26, 2018 5:57 pm    Post subject: Re: Another intresting CAV injector pump problem Reply to specific post Reply with quote

Didn't mean that it could not start at idle, but would start better with a little throttle. I know my green 2004 with only 500 hours starts a lot better with some throttle. At idle it Starts instantly but sputters a little before smoothing out. At 1/4 throttle it purrs instantly.
 
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ptfarmer
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PostPosted: Wed Sep 26, 2018 7:39 pm    Post subject: Re: Another intresting CAV injector pump problem Reply to specific post Reply with quote

Has to be the wonderful diesel fuel they are making these days causing these problems.
 
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