V8 dies when cold... - Defender Source
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  #1  
Old February 19th, 2007, 02:04 AM
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Bradlee Duncan
'94 White and '95 Red D's
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V8 dies when cold...

Hey guys, I tried searching on this, but I found the opposite of what's happening here. Our 95 d-90 dies when it's cold just a little bit after it starts up. For example, the other morning after starting it in the morning, drove it a few blocks down the road and it died. If I wait for a little while (~10-15 min) and try starting it again it'll start up fine and run all day long. If I keep the engine warm all day, the problem doesn't happen at all on any more startups, just that initial cold one of the day. Any ideas as to what this might be?
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  #2  
Old February 20th, 2007, 08:14 AM
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Sterling M Archer
1995 AA Yellow NAS D90 #2986
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Cold Chip

There is a computer chip that you can buy for the 1995 D90s for colder weather. Some of the 1995 D90s that were delivered (in warm climates CA) had a differnet computer chip. If you do not have one, I am sure one of the Rover parts company has one. If you think this is the case let me know I have the part number somewhere.
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  #3  
Old February 20th, 2007, 01:18 PM
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Sterling M Archer
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Part Number

The part number is PRM3654 for the cold climate chip.
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1995 NAS Defender 90 AA Yellow #2986: Current
2009 Range Rover Supercharged Black/Black: Current

1993 NAS Defender 110 #375/500: Sold
1995 NAS Defender 90 Soft Top Beluga Black #2556: Sold
1991 Range Rover Hunter Green: Sold
1997 NAS Defender 90 Station Wagon Portofino Red #128: Sold
1993 NAS Defender 110 Beluga Black #215/500: sold
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  #4  
Old February 20th, 2007, 02:16 PM
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Bradlee Duncan
'94 White and '95 Red D's
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So how do you install this chip? I bet that's the case because it's a Southern California D-90. I'll look into it. Thanks! Weird thing is that it didn't do it last winter (the first winter we had it), so are there any other possibilities? It has about 100,000 miles on it.
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  #5  
Old February 20th, 2007, 02:18 PM
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Jim Ngo
1994 D90 #80
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Sounds like perhaps the stepper motor could use a good cleaning.
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  #6  
Old February 20th, 2007, 03:23 PM
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Arthur Maravelis
97 SW
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Did you by chance change the thermostat to a lower temp one?

Last summer I was getting higher than normal temps and replaced the radiator. I also changed the thermostat to a low one - 165 I believe - in an effort to lower the temp. With the stock thermostat I was getting 210-220 and the gauge was still in the proverbial middle.

I forgot all about the lower stat until this winter. The truck takes much longer to get to temp. If I go about 15 minutes and shut her off, restarting is fine but she wants to stall. Gotta give her some gas and rev it a bit for a minute or so to stop the stall.

Also, after being shut off for even a minute, the gauge temp drops almost to the end.

I need to get back to a stock thermostat but it's cold to deal with it so I'm hoping a homemade rad muff will help.
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  #7  
Old February 20th, 2007, 03:26 PM
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Sterling M Archer
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Not Sure

When I bought my 95 D90 (S. CA D90) it was suggested that I also by the cold start chip since it gets cold here in KC. It never had any start up problems, so I never changed it. I think (and please correct me if I am wrong) that you open up the ECU and there should be a similar chip you carefully pull off and put in the cold start one. You will want to ground yourself first so you do not zap your ECU with static electricity. I sold the D90 to my dad in CO who just last week sold it to Carl (cr7707) on this board who also lives in KC. Small world... Anyhow I am going to give it to him and whether or not he wants it is up to him. Like I said I never needed it here in KC.
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1995 NAS Defender 90 AA Yellow #2986: Current
2009 Range Rover Supercharged Black/Black: Current

1993 NAS Defender 110 #375/500: Sold
1995 NAS Defender 90 Soft Top Beluga Black #2556: Sold
1991 Range Rover Hunter Green: Sold
1997 NAS Defender 90 Station Wagon Portofino Red #128: Sold
1993 NAS Defender 110 Beluga Black #215/500: sold
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  #8  
Old February 20th, 2007, 06:07 PM
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Bradlee Duncan
'94 White and '95 Red D's
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Good suggestions guys, I'll do some checking. I didn't change the t-stat though, so I don't think it's that. The stepper motor I remember reading is very common, maybe I'll check that first. Then I'll move on to the cold weather chip.

Thanks for the suggestions guys!
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  #9  
Old February 20th, 2007, 10:16 PM
Andrew Vick
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Andrew Vick
95 D90
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Location: Basalt, USA
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I don't think you can get that chip anymore. I was having all types of issues last year after bringing the truck from Roanoke to 8,600 feet. After fiddling with it for weeks in temps ranging from 40 to -20, I finally just left it alone and it worked itself out. PITA, but it's now very reliable.














Until tomorrow morning, when something will happen.
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  #10  
Old February 20th, 2007, 10:38 PM
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Michael D. Milliken
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I experienced some weird stuff like that when my ignition module was going bad.
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