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Old 07-21-2008, 06:42 PM   #1
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Does anyone have any ideas about why my cat diesel runs at low rpms like it has a miss. I have changed fuel filter no help. I have used injector cleaner no help. Generator runs fine on same fuel supply and I have used over one hundred gallons of diesel (trip) Miss is still there no better no worse
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Old 07-21-2008, 06:42 PM   #2
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Does anyone have any ideas about why my cat diesel runs at low rpms like it has a miss. I have changed fuel filter no help. I have used injector cleaner no help. Generator runs fine on same fuel supply and I have used over one hundred gallons of diesel (trip) Miss is still there no better no worse
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Old 07-22-2008, 01:32 AM   #3
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tripleesignature, welcome to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences. Sorry to hear of the Cat issue. I am going to put in a short cut to the Cat Owners section of the forum so we can get you some asnwers. Good luck and keep us posted. Have a great summer.
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Old 07-22-2008, 02:57 AM   #4
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I forgot to add it is a 2004 C7 300 HP Diesel Pusher motorhome
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Old 07-22-2008, 06:16 AM   #5
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Hope it is not an injector. $$$$
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Old 07-22-2008, 06:42 AM   #6
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check for broken or missing blades on the engine fan. it happened to me.
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Old 07-22-2008, 11:41 AM   #7
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It is most likely an injector problem. When an ijector is leaking it will cause a miss at idle.
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Old 07-22-2008, 03:21 PM   #8
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Try someplace like this...

http://www.accurateis.com/

From a CAT site re: the C7 engine and it's injectors...

Improved HEUI Fuel Injectors
The Cat C7 has proven high-pressure, direct injection fuel system electronically monitors operator demands and sensors optimize engine performance.
Hydraulically actuated electronic fuel injection (or HEUI™) is a Caterpillar-exclusive technology with a proven track record built by millions of engine hours. The refined HEUI design delivers multiple microbursts of fuel during the engine's compression stroke, precisely regulating the combustion cycle. The improved HEUI design also enhances combustion and "rate shaping"¯ of fuel delivery, which helps control engine sound and vibration levels. The HEUI system continues to offer excellent reliability because it has fewer moving parts than mechanical unit injection and requires very few adjustments, reducing maintenance costs and increasing machine availability.


Here is a link to a description of the C7 setup from an off-road CAT equipment site but I suspect it is similar if not exactly the same engine.

C7 INFO

...and yet another blurb about the CAT HEUI injection system

HEUI™ Fuel Injection System
"¢ HEUI fuel system fully integrated with ADEM
advanced electronics
"¢ Cross-flow cylinder head with integral fuel and oil
manifolds "” completely rebuildable
"¢ Improved cold startability (down to 0? F) "” with
standard air inlet heater
"¢ Caterpillar designed combustion technology and
performance criteria for superior fuel economy and
greater performance over a wider operating range
"¢ Higher injection pressures for better fuel economy
and performance while meeting latest emissions
standards
"¢ Adjustment-free HEUI fuel injector with stainless
steel sleeve for greater reliability
"¢ HEUI oil rail integrated into cylinder head provides
high-pressure oil to power the HEUI injectors


Per Johnson CAT, they are about $450 each

Their number is (951)683-5960. I realize you are in MN but maybe give a call to your local CAT dealer. Johnson is a HD machinery dealer but they also have a truck division/shop on site to deal with on-the-road rigs including MH's. You should first bring it to a shop so they can put it "on a scope" and diagnose the source of the miss before you shell out that kind of $$$.

Just my $.02 Pesos
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Old 08-09-2008, 06:22 AM   #9
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This is a site that provides a very good document regarding the HUEI fuel delivery system: pump, injectors, diagrams and explanations.
Here

At present my 2004 330 HP C7 engine shutters at take off and has depowered twice, but clears it self and then runs well the rest of the day. Next morning the same thing happens again; this has been going on since early June. A CAT dealer has replaced injector #1 and the fuel regulator valve (fuel line check valve) and has now ordered a second injector for cyclinder #2. Apparently, in my case, trouble shooting the problem is an expensive hard guess as even the ECM snap-shot while the shutter occurrs is not providing a specific clue. The cost of the injector replacement is included in the CAT five year warranty which ends in December. SteveG
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Old 08-09-2008, 02:06 PM   #10
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Yes it sounds like a bad injector, or blocked feed line to an injector.
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Old 08-11-2008, 02:18 PM   #11
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What is the likelyhood that CAT will replace all of the injectors in case your batch was defective? With two being replaced, it could be a godd enough reason for requesting all be replaced JIC.
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Old 08-12-2008, 11:08 AM   #12
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quikduk, I have also thought of requesting CAT to replacing them all and mentioned it to the local Service Manager. He is taking a "Lets wait and see..." stance but does not think CAT will replace an injector under warranty that is operating correctly. I have not yet talked to CAT about this nor has anyone advised me why the injector (assuming the problem is injectors) has failed. So my plan now is to get it fixed so I can get the MH out of the shop and use it. Then I'll talk to CAT about why they broke and the potential for additional failure. At least I'll be on record if any additional failure in the near term occurs. Thanks, SteveG
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