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n/a
Active Member

13 Posts
Posted - 10/31/2016 :  09:14:53 AM  Show Profile  Reply with Quote
I have a 2007 Caterpillar that during a cold start the engine will miss and carry on like it has lost its fuel prime. I have repalced the timing sensors, HEUI pump, fuel psi regulator valve, even checked for air in fuel and it can sit overnight and no air shows up in the fuel system but it still runs as if it is full of air. Unit is not gaining oil or anything like that. I have no check engine light either. Anyone else experience this?

RonF
Top Member

867 Posts
Posted - 10/31/2016 :  09:55:30 AM  Show Profile  Reply with Quote
Sounds like injectors to me. Had one at the end of last school year doing that and also very had to start.
US Army retired CMBT
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aaronwilmoth80911
Top Member

538 Posts
Posted - 10/31/2016 :  10:09:52 AM  Show Profile  Visit aaronwilmoth80911's Homepage  Reply with Quote
I second the injectors. Has the unit lost a HUEI pump, or was it replaced just to be replaced?
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bwest
Administrator

United States
3820 Posts
Posted - 11/01/2016 :  05:27:00 AM  Show Profile  Reply with Quote
Have you checked codes?
Bryan
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busrench
Active Member

31 Posts
Posted - 11/01/2016 :  06:39:38 AM  Show Profile  Visit busrench's Homepage  Reply with Quote
I have a set of freshly rebuilt injectors from a '04 Cat C-7 that I took out before I scrapped the engine. Turns out they were not the issue. I'm sure my school would sell them cheaply.
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bwest
Administrator

United States
3820 Posts
Posted - 11/01/2016 :  07:39:46 AM  Show Profile  Reply with Quote
If Josh doesn't want them let me know. I might be interested.
Thanks
Bryan
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n/a
Active Member

13 Posts
Posted - 11/02/2016 :  07:24:23 AM  Show Profile  Reply with Quote
I am also leaning toward injectors. If you could tell me a price I will mention it to my boss and let you know.
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RonF
Top Member

867 Posts
Posted - 11/02/2016 :  08:26:32 AM  Show Profile  Reply with Quote
$358.41 from my local Yancey/Cat dealer. Those were reman's.
US Army retired CMBT
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Thomasbus24
Administrator

USA
4547 Posts
Posted - 11/02/2016 :  11:44:41 AM  Show Profile  Reply with Quote
Use extreme caution here...sometimes when the HPOP goes it feeds the injector oil circuit metal shavings. If you don't flush it out you'll just destroy $2000 worth of new/reman injectors!
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torque
Advanced Member

Canada
358 Posts
Posted - 11/02/2016 :  1:37:40 PM  Show Profile  Reply with Quote
SO true, we flushed, then ran a magnet through where we could and still got a bit
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busrench
Active Member

31 Posts
Posted - 11/03/2016 :  04:37:32 AM  Show Profile  Visit busrench's Homepage  Reply with Quote
I'll ask the schools business manager what we want for these. Turns out this Cat had broken rings. Live and learn!
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bwest
Administrator

United States
3820 Posts
Posted - 11/03/2016 :  05:36:57 AM  Show Profile  Reply with Quote
quote:
Originally posted by busrench

I'll ask the schools business manager what we want for these. Turns out this Cat had broken rings. Live and learn!


Broken rings! Imagine that! lol
Bryan
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busrench
Active Member

31 Posts
Posted - 11/03/2016 :  10:42:03 AM  Show Profile  Visit busrench's Homepage  Reply with Quote
We paid $540.00 to have the injectors rebuilt. The engine ran for 5 minuets before I pulled my head out of.... you know where.. and realized it was a compression issue. I was wrong when I said it was an '04. These came out of an '03 3126 Cat. Don't know if it makes any difference. Anyway the school would take $250.00 for'em.
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Thomasbus24
Administrator

USA
4547 Posts
Posted - 11/03/2016 :  11:40:23 AM  Show Profile  Reply with Quote
Amazing prediction....cylinder #5????
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bwest
Administrator

United States
3820 Posts
Posted - 11/03/2016 :  12:14:03 PM  Show Profile  Reply with Quote
quote:
Originally posted by Thomasbus24

Amazing prediction....cylinder #5????


Are you predicting #5? lol
Bryan
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busrench
Active Member

31 Posts
Posted - 11/03/2016 :  12:16:06 PM  Show Profile  Visit busrench's Homepage  Reply with Quote
Yep, #5. Had a rusted out but good running sister bus with a Cummins and did a transplant this summer.
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Thomasbus24
Administrator

USA
4547 Posts
Posted - 11/03/2016 :  12:25:03 PM  Show Profile  Reply with Quote
Smart move
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n/a
Active Member

13 Posts
Posted - 11/04/2016 :  05:21:29 AM  Show Profile  Reply with Quote
busrench, I'm not sure if those would be the same as what is needed in my C7 ACERT I better do some research. Thanks for the input everyone.
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bwest
Administrator

United States
3820 Posts
Posted - 11/04/2016 :  05:49:57 AM  Show Profile  Reply with Quote
quote:
Originally posted by busrench

Yep, #5. Had a rusted out but good running sister bus with a Cummins and did a transplant this summer.


This might be a discussion for another thread but I'm wondering if this is an issue with the design of the block. It seems to be #5 all the time.
Bryan
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