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11-06-2014, 03:36 PM
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#1
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Junior Member
Join Date: Oct 2008
Location: Berryton, KS
Posts: 20
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Engine won't fire
I have been having intermittent issues with motorhome starting fine in past but engine light not going off and therefore minimal power. After shutting down and restarting a few times the light would go off then power fine. Now the day before I have an appointment with local Cat dealership (Foley Tractor) in Topeka, KS to have it looked at I am unable to get it to start at all. I also have not yet found the location where they can plug in their diagnostic computer to read fault codes. I was hoping they have some software issues to update or such as this unit only has 32,000 miles on it and has not been looked at by Cat mechanic in at least 10 years. Any ideas? One thing I noticed while cranking the oil pressure goes to nearly vertical but sometimes drops to zero after about 6 seconds of cranking but not every time. Also is it ok to start the unit while plugged in to house power? I appreciate any advice as this unit has been trouble free until just the past year. Fuel is good and has new fuel filter about 15 miles ago
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1999 National Tradewinds 7370 300HP Cat 3126B S#7AS55236
Allison 6 speed MD3060 Onan 7.5 KW deisel generator
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11-06-2014, 07:52 PM
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#2
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Member
National RV Owners Club
Join Date: Sep 2013
Posts: 45
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Their is a fuel valve/solenoid behind the heui pump, good chance that's what the problem is, engine oil also plays a big role as well !
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Rick & Tonja
2001 National Tradewinds 7390, Cat 3126B, Allison 6speed
Toads-FLTR3SE CVO, T-Rex, S55 AMG
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11-06-2014, 08:03 PM
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#3
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Junior Member
Join Date: Oct 2008
Location: Berryton, KS
Posts: 20
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Just got it fired up spraying ether into air intake but cant get engine light to stop blinking and engine shuts down as if programmed after a while but starts right back up so I think I can max out at 45 mph and get it to Cat guys in morning?
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1999 National Tradewinds 7370 300HP Cat 3126B S#7AS55236
Allison 6 speed MD3060 Onan 7.5 KW deisel generator
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11-06-2014, 08:04 PM
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#4
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Junior Member
Join Date: Oct 2008
Location: Berryton, KS
Posts: 20
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Code appears to be 58 when using cruise buttons as book shows
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1999 National Tradewinds 7370 300HP Cat 3126B S#7AS55236
Allison 6 speed MD3060 Onan 7.5 KW deisel generator
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11-19-2014, 07:07 PM
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#5
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Member
Join Date: Dec 2010
Posts: 45
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I have a similar problem, as it seems mine won't start after I fill with fuel. I spray a small amount of ether in the air intake and engine starts every time until the next fuel up. I have been told that my injectors are bad by a Cat mechanic that plugged into my coach (he is a boss who has been out of the field for a long time). This started when the engine had maybe 38k miles or less(has 45k now). Another Cat mechanic told me to look at the lift pump which I don't know where or what to look for. Keep us posted on what you find out?
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11-19-2014, 07:11 PM
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#6
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Greg Hunsicker
Just got it fired up spraying ether into air intake but cant get engine light to stop blinking and engine shuts down as if programmed after a while but starts right back up so I think I can max out at 45 mph and get it to Cat guys in morning?
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NEVER spray starting fluid into the intake of a modern engine and I think the 3126 is new enough to have a starting grid in the intake. That could cause an explosion and cause thousands of $$ damage and land anyone close by in the hospital.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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11-19-2014, 07:21 PM
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#7
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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Greg said "Fuel is good and has new fuel filter about 15 miles ago"
If you just installed a fuel filter 15 miles ago and the problem sounds like you are not getting fuel wouldn't you want to check the new filter and or the installation?
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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11-24-2014, 09:07 PM
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#8
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Member
Join Date: Dec 2010
Posts: 45
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Just changed all the fluids and filters in my 1999 Tradewinds 300 hp cat yesterday. After years of my starting problems, I found that water separator was only hand tight! Its now changed out and tight.
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