Posts: 13
Threads: 2
Joined: Jun 2026
Posts: 5,958
Threads: 267
Joined: Jul 2012
Welcome!
Tell us a bit about your mechanical and electrical experience so that we can tailor answers to your questions.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home

)
Posts: 14
Threads: 1
Joined: Jan 2023
I see the engine temp gauge slightly over 200 and it appears check engine light is on…..that is hot for an old 8v92 at idle
David and Mandy Peterson
Forest almost 5
Elara born in our newell 2 years ago!
1989 DDECII 8v92 coach 209 sold
1997 BMC 40 sold
1998 h3-45 dual slide, dual rooms(one with bunks)
1973 Challenger 50 ketch
Posts: 13
Threads: 2
Joined: Jun 2026
(07-11-2026, 06:22 AM)Richard Wrote: Welcome!
Tell us a bit about your mechanical and electrical experience so that we can tailor answers to your questions.
Well i’m decent with basic stuff like oil change on my generator. I do a little bit of work on my Lexus LX 470 Toyota Land Cruiser, like spark plugs oil taking small things apart. I replaced the sunroof motor before
on my Coach. I have replaced a pump on the aqua hot before I have fixed some electrical stuff on the suv as well. Today my ac controls shorted out do you condensation. I isolated it and put a dryer on it lol now it works again I need to find out why the compressor is getting cold enough to make a lot of condensation. I suspect I’m over on the Freon I would say I’m 3/10 on mechanical stuff lol

1994 43’ Newell 351 8v92

2005 Alfa gold 39’ Cummins 400 (sold)
Posts: 13
Threads: 2
Joined: Jun 2026
(07-11-2026, 07:14 AM)Greasepower Wrote: I see the engine temp gauge slightly over 200 and it appears check engine light is on…..that is hot for an old 8v92 at idle
Yeah you know it’s so concerning because it’s literally out of Diesel shop that’s where the previous owner was storing it at and so it just seems like they don’t know anything about it at this point because if you’re telling me that’s hot, I did look online and figure out how to read the check engine code by holding the DDEC and the codes were
low coolant
oil/coolant over temperature
Oil pressure sending voltage
Engine over speed
The batteries are extremely low. They have to jump it. They have one set in the engine bay completely disconnected so there’s jumping 2 8D batteries to get the coach started and then they’re literally idle in it and having to manually hit the gas to try to get the bags to air up. Smh How horrible is this. first thing I asked was did they check coolant and did they check oil even before I ran the codes I was told that they did. They actually did show me the oil and it seemed like it had enough oil smh how worried should I be

1994 43’ Newell 351 8v92

2005 Alfa gold 39’ Cummins 400 (sold)
Posts: 5,958
Threads: 267
Joined: Jul 2012
First, the gauges on the dash will be insanely inaccurate at this point. Get a Bluefire set up OR find a used VSMPc to read the temps and codes digitally.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home

)
Posts: 14
Threads: 1
Joined: Jan 2023
(07-11-2026, 05:30 PM)Richard Wrote: First, the gauges on the dash will be insanely inaccurate at this point. Get a Bluefire set up OR find a used VSMPc to read the temps and codes digitally.
I 100% agree, always use blue fire.
But check engine and the other engine light is on. Those are reading from the digital output of the DDEC(same as blue fire will read)
DRea5000, you sound like you have enough knowledge to get started on this adventure.
Check those fluids yourself and spend the 250 bucks to get a blue fire.
You will need to find your communication port. It might be 6 pin or an ALDL plug(If I remember)*you need to know what com port you have to order proper adapter harness.
Check your belts and everything yourself. Let the learning begin!
David and Mandy Peterson
Forest almost 5
Elara born in our newell 2 years ago!
1989 DDECII 8v92 coach 209 sold
1997 BMC 40 sold
1998 h3-45 dual slide, dual rooms(one with bunks)
1973 Challenger 50 ketch
Posts: 13
Threads: 2
Joined: Jun 2026
(07-11-2026, 07:14 AM)Greasepower Wrote: I see the engine temp gauge slightly over 200 and it appears check engine light is on…..that is hot for an old 8v92 at idle
absolutely that was one of my concerns. Also the vote I checked the alternator while running and only got about 12.8 I checked the batteries and got 12.6 so I will be taking the alternator off on Monday and taking it to a rebuild shop also I ran the code with my Prolink determine that the Diesel shop that is at absolutely lied about the coolant level but it’s my fault because I should’ve checked it before operating the engine. It was low about 4 gallon. my question is where did the coolant go now it has that for six years. my plan is to do a coolant flush and change out the air dryer filter and see if that helps if you have any other suggestions for getting the temperature under control. Please let me know. Also, is there another way for you to check the temperature because my gauges don’t seem to be reliable for instance, my speedometer is wonky. my fuel tank gauge is crazy so I’m not 100% sure I can rely on the gauges. I did thermal gun on the engine and the radiator and the temperature did not seem to be even close to 200 I’m not sure if I did it correctly

1994 43’ Newell 351 8v92

2005 Alfa gold 39’ Cummins 400 (sold)
Posts: 13
Threads: 2
Joined: Jun 2026
(07-11-2026, 08:09 PM)Greasepower Wrote: (07-11-2026, 05:30 PM)Richard Wrote: First, the gauges on the dash will be insanely inaccurate at this point. Get a Bluefire set up OR find a used VSMPc to read the temps and codes digitally.
I 100% agree, always use blue fire.
But check engine and the other engine light is on. Those are reading from the digital output of the DDEC(same as blue fire will read)
DRea5000, you sound like you have enough knowledge to get started on this adventure.
Check those fluids yourself and spend the 250 bucks to get a blue fire.
You will need to find your communication port. It might be 6 pin or an ALDL plug(If I remember)*you need to know what com port you have to order proper adapter harness.
Check your belts and everything yourself. Let the learning begin! It’s the ALDL 6 pin. I have a prolink with the wrong cartridge lol I will get online and find the bluefire asap. yeah I definitely wish that I would’ve checked the levels myself, but I did check the oil and there’s no coolant inside the oil so I’m assuming it didn’t really get too hot, but I wasn’t able to get the actual readings from the computer to tell me how hot it had gotten then or in the past

1994 43’ Newell 351 8v92

2005 Alfa gold 39’ Cummins 400 (sold)