I got the Service Engine Soon lights on on my 2003 Discovery. I did try to recheck the gas cap and the light went off two times after I did so, but this time it just stay on and on and never disappear anymore. Also the truck is loosing power and I found my truck was kind of shaking and stumbling when I stop at the intersections. And I always got some water on the ground near the rear exaust pipe every morning when I first start the behicle. And Ichecked the exaust pipe and got my figers all black when Itouchedthe inside of the pipe. It sounds to me the engine is running very rich and I am not sure if there's collant leaking inside the engine itself.

I am looking for some advices here on where I should start to do further dignosis, do I likely have something wrong on O2 sensors? or engine block is leaking coolant, etc?

Thanks a lot!

 

Possible head gasket? I picked up a code reader obd 2 for $39.00 to give me some idea of whats going on with my cars/trucks . beats going to garage for them to hook it up for $40 to $75.00 just to say this is what it is or might be. For 5 minutes work i might add

 

How many miles on your truck, what octane are you running and do you still have a check engine light on, if so go get the codes and get back to us with the exact fault code numbers.

 

if its shaking when you come to a stop, its most likely a misfire. did the light ever start flashing? if it is, you will get a very rich exhaust mixture due to the engine thinking its reunning lean, its weird, but thats how it works. grab a spray bottle, fill it with water and mist the plug wires when the engine is running, if you see little sparks and hear a clicking sound, you need new ones.


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Sounds like you need new spark plugs and plug wires.
Water coming out of the tailpipe in the morning is normal, running rich or not the inside of the tailpipe will be dirty, its the nature of the internal combustion engine.
You need to have your check engine codes read. Let us know what they say and we can help you.

 

So I finally got the codes read, oh my God, there were actually four fault codes
P0174, P0150, P1174, P0159

And the truck currently has 72,000 miles on it.

Any idea?

 

What octane gas are you running?????????????????????????????
Have you had the tune up at 60K?
Too early for 02 sensors, but you are looking that way so far.

 

Running 91 all time, ecept two refills about month ago where only 87 regular was available in that rural area. did have the 60k service at a dealer place here, but the service engine soon lights started on at around 69K.

so do these codes really mean?

 

02 failures, lean bank running conditions and most likely a bad vacuum leak.

 

Thanks, Mike. Any suggestion where I should start to correct all these? Thanks!