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Old 10-30-2015, 11:53 AM   #1
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Ignition Problem

I have a 2008 Discovery 40X that sometimes after being shut off and then driven away shows a warning shut off vehicle. When stopped and restarted it is normal. I wonder if anyone else has encountered this problem with any Discoverys. It's like its and ignition problem. Also sometimes when you step on the accelerator it is very slow in getting wound up. Anyone having any of these problems?
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Old 10-30-2015, 12:53 PM   #2
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Originally Posted by redbill1234 View Post
I have a 2008 Discovery 40X that sometimes after being shut off and then driven away shows a warning shut off vehicle. When stopped and restarted it is normal. I wonder if anyone else has encountered this problem with any Discoverys. It's like its and ignition problem. Also sometimes when you step on the accelerator it is very slow in getting wound up. Anyone having any of these problems?
Assuming you have a Cummins engine, Check Engine Light is not uncommon. There are a number of threads on the subject in this forum with a plethora of ideas and solutions.
During the first couple of years I had my coach (purchased used) I had a CEL on a number of occasions. No rhyme or reason, it would just happen. I'd pull over, shut down for a couple minutes, restart and off we went. Everything normal.
I paid Cummins to check for any failure codes and there no none present since the engine was new.

So, I just began experimenting with various ideas, until I ran across a post somewhere saying that during start up, if the WAIT Light is not allowed to complete its full cycle, it will cause a fault in the ECM and result in a random CEL. After reading this I have been conscious of this and have not had a CEL in over a year. Touch wood....

To address your 2nd question, I'm not quite sure what you mean by slow to accelerate. If you are referring to the CEL condition, yes, it will be because when the CEL comes on the ECM derates the engine to reduce load.

If you are referring to normal operation, I'll try to explain this way.
Diesel Engines do not accelerate. They gain Momentum. Remember, you are moving +_40,000 lbs of mass so don't expect your coach to Accelerate like your Ford Taurus SHO.

Hope this helps,
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Old 10-30-2015, 06:20 PM   #3
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Originally Posted by redbill1234 View Post
I have a 2008 Discovery 40X that sometimes after being shut off and then driven away shows a warning shut off vehicle. When stopped and restarted it is normal. I wonder if anyone else has encountered this problem with any Discoverys. It's like its and ignition problem. Also sometimes when you step on the accelerator it is very slow in getting wound up. Anyone having any of these problems?
Question: How do you drive away after shutting the engine off?
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Old 10-30-2015, 11:42 PM   #4
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I start the engine after stopping for awhile before I start to drive away, sorry you misunderstood this.
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Old 10-30-2015, 11:47 PM   #5
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I realize it is not a fast acceleration machine, but this just feels like it is not even reving up for 10 secs or so.
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