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Old 07-22-2018, 06:52 PM   #1
RockinAB
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Default 2005 Crescendo with CAT diesel performance issues

Hi all
Was just wondering if any of you have had any issues with studder or slow go. There are only 23k miles on it and it is serviced regularly. I have tried additives, cleaning the jets and new air filter. It doesn't do it all the time, but it is happening more and more... I need it to go when I push the accelerator. It used to go every time. Please help!
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Old 07-23-2018, 01:18 AM   #2
robquin
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Hi. I own the 2006 Crescendo and a few years back I had the exact same problem. I had the two gas filters replaced and that solves the problem. Any slight blockage to diesel will cause the stuttering and RV will also slow down and lose power.
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Old 07-24-2018, 06:25 PM   #3
Frutza
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Look it up on Cat forms, the C7 runs great, if you take good care of it, It likes good clean oil to protect the Heui system, It may cost a little more, but its cheap insurance, I had used various good quality oils and filters, but in talking to Cat mechanics I have gone to using Cat oil and filters, not much different in price than using other stuff, I also change my oil ao or before 7500 miles. look up adept ape videos, very informative, hears one,

But like was said start with fuel filters, both of them, also if its has sat for a long time it could have algae in the tank.
Oh, I think mine runs great, I can take off from a light and keep right with traffic
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Old 07-29-2018, 09:21 AM   #4
mhhorowi
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If it's not the filters, it could also be the dreaded fuel injector issue. We've had to replace all of our fuel injectors. If the Heui pump fails, it sends metal into the fuel injectors and then they are lost too. An expensive problem that is mitigated with very clean oil.
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Old 07-29-2018, 07:38 PM   #5
jamador1010
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I have 04 with a C7 330 with updated software to 350. So, I would start with process of elimination. I believe you are sucking air through fuel. 1) check to be sure your fuel filter (s) do not have a double gasket left by old filter. 2) If you have a hand pump on fuel filter housing replace and install new gasket, look inside mount to make sure there are no hairline cracks. 3) check all fuel lines for loose connections and chaffing. 4) the fuel return on back of head take it off and run carb cleaner through it and blow out repeatedly. 5) make sure all pre-charge hoses do not have a pin hole and or broken or loose clamp. I truly don't believe you have a Huei pump issue. I would strongly consider running the overhead, it's easy and, it can make a big difference. Takes half the day though! Following!!!
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Old 07-29-2018, 07:52 PM   #6
mhhorowi
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Quote:
Originally Posted by jamador1010 View Post
I have 04 with a C7 330 with updated software to 350. So, I would start with process of elimination. I believe you are sucking air through fuel. 1) check to be sure your fuel filter (s) do not have a double gasket left by oiled filter. 2) If you have a hand pump on fuel filter housing replace and install new gasket, look inside mount to make sure there are no hairline cracks. 3) check all fuel lines for loose connections and chaffing. 4) the fuel return on back of head take it off and run carb cleaner through it and blow out repeatedly. 5) make sure all pre-charge hoses do not have a pin hole and or broken or loose clamp. I truly don't believe you have a Huei pump issue. I would strongly consider running the overhead, it's easy and, it can make a big difference. Takes half the day though! Following!!!
We also have an 04 C7 330. How do you like the upgrade?
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Old 07-29-2018, 08:38 PM   #7
jamador1010
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Honestly, I was after lower end torque as I dingy tow a 1500 Chevy Silverado and travel to Colorado Springs / Kremmling frequently. I did loose 1/10 on my MPG but I'm okay with that. Additionally, I have free access to software so all I have in it was my time. You would be surprised on how much difference just running the overhead makes without updating software....
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Old 07-29-2018, 08:46 PM   #8
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Also, keep in mind to check your engine fan bearings annually, some have grease and some have sealed bearing. Mine has been issue free and I wash out radiator as well, but this was one of the biggest issues with Cat!
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Old 07-30-2018, 08:38 AM   #9
mhhorowi
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It's nice to have free access . We tow a CR-V; so, it's not much of an issue for us. We just did a trip from Southern Arizona to see Mount Rushmore and Devils tower and of course went through Colorado. We averaged 8.2 mpg as I was pretty good at keeping the RPM's in a reasonable range. It's not always easy when you need to climb those mountains. We just went over 50K miles but we also had to have all the Injectors replaced and a Heui pump due to a failure. I inquired about the software upgrade but declined when I found out the cost. Time for an oil change
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Old 08-01-2018, 05:39 AM   #10
Big Shasta
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Don't mean to hijack your thread but this is similar. We just picked up our 06 GS crescendo 8356 and drove it home 6 hours. looks like I got ~7 MPG Previous owner said he got 10 consistently going 70 on the highway (was he exaggerating?). I wasn't towing but I did run the generator since it was stupid hot in florida. My wife was following and she said every so often and randomly there would be a puff of smoke out the exhaust. Any ideas. Should I throw some fuel cleaner in it, not sure how long it's been sitting but it only has about 20K miles on it. Dealership just changed the oils. Power seemed fine, but I don't know what to expect. It got up to speed just fine and I set the cruise at 70 on the interstate.

The engine is a Cat C7 but we were told it was a 300, 330 and a 350 by different folks. How can I tell?
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