Greetings All, First Post. Below a certain temp, seems around 35 Deg F., my Discovery II 4.0 turns over fine, just won't start. I have to dump about 6oz of gasoline down its throat and shoot it with a small amount of starter fluid to make it fire. Once it fires, it stays running.
Another experiment, Monday, 9 Deg F., turns over, no start. Tuesday, 16 Deg F., turned over for about 7 seconds, no start. Wednesday, 30 Deg F., turned over, started right up. Something is not happening in the cold weather that happens in the warmer weather. I need help from the experts.


Thanks


Jon

 

Well, it's interesting that it runs after you juice it.

The first thing I'd try is swapping the fuel pump relay with the relay next to it.

Cold tends to help relays act up, and maybe once you get it running the relay is kicking in. Sound pretty thin, but it's easy to check.

 

I am having this same problem with my 2000 D2. I have replaced that fuel pump, Crank position sensor. Idle control valve. I haven't checked the fuel relay. Where exactly is this relay located under hood I am assuming.

 

It should be in the fuse box under the hood on the passengers side.

I would make sure you don't have a CEL on, and your vehicle is running good with a smooth idle when warm first. Checking out your plugs and wires might be a good idea if they have not been replaced recently.

However if I had to guess I would say it is a fuel system issue since it fired up when you used starting fluid. There should be other members that have more experience with these vehicles on soon.

 

Hey guys a update on my cold no start LR. I changed the fuel pump relay under the hood. It has been about 20 degrees here in oklahoma . Normally LR wouldn't start. It has not missed a start since changing the relay. Hope maybe this will help someone else.

 

Greetings All Again,


Been playing with the Discovery a little since my last post. Found out something interesting. If you crank the heck out of it, it just dies, but if you feather it, it starts!!! I only crank it for about one or two seconds at a time. After about two or three cranks, I pump the gas peddle, crank it two times again, pump the gas. Usually after about two or three of these procedures within 90 seconds, it cranks, starts and keeps running. Seems to be a fuel problem. The air/fuel ratio seems to be too lean to start during really cold temps. Does this help with the diagnosis? Am I getting close???


Thanks


John

 

I wonder why this particular relay is a common failure? I had a similar situation as the OP. Turned out, the FP relay failed.

Does moisture get in the and then freeze below certain temps?