| Author | Message | ||
     Mike Ford (Mford) New Member Username: Mford Post Number: 2 Registered: 08-2003 |
My chech engine light came on a few months ago. Checked code and indicated a cylinder misfire followed by excessive emissions fault. Erased codes - light off. Last month light back on. Checked code and indicated misfire on cylinder 1 and emissions fault. Erased codes - light off. next day light back on. Checked code and indicated misfire cylinders 1 and 8 and emissions fault. The engine is idling rough and doesn't seem to have much power. Discovery info: 1998 LSE 4.0 52,000 miles. had 30,000 maintenance done at dealer last year and only oil changes since then. Dumped in a can of Chevron fuel system cleaner to see if this would help last week. Haven't noticed a difference. Light still on. Please help me come up with a solution for this that I can repair without going to dealership. Thanks, Mike | ||
| john heath (Jheath6) Member Username: Jheath6 Post Number: 113 Registered: 09-2003 |
sticking ex. valves, which valve cleaner won't help them | ||
| Mike Ford (Mford) New Member Username: Mford Post Number: 3 Registered: 08-2003 |
If this is the problem, we are probably talking about a valve job here? Does anyone know the approx. cost. | ||
| john heath (Jheath6) Member Username: Jheath6 Post Number: 122 Registered: 09-2003 |
it can be done by yourself there is a good article on here on how to do it | ||
| Jason McCombs (Jasonmc) Member Username: Jasonmc Post Number: 103 Registered: 06-2003 |
John where is the DIY valve job article at? | ||
| Robert Pate (Racerx) New Member Username: Racerx Post Number: 24 Registered: 08-2003 |
I had my CE light come on last week. Same thing misfired light came on and is now running slugish. This morning I noticed a ticking sound in the engine sounds like lifters bet it's the valves. Looks like I have some work to do. How long can you run with a sticking valve??? | ||
| Bill Bettridge (Billb) Dweb Lounge Member Username: Billb Post Number: 1208 Registered: 02-2002 |
Jason - here is the old post I liked - haven't had the need to try it myself yet, but I'd try this first if it were my truck: Land Rover 4.0 GEMS motors are not the only pushrod V8s prone to this problem. Most of the EFI V8s used by the various sterndrive manufacturers have had this exact same problem. Their answer was/is not valve jobs but an array of proprietary products designed to vaporize in the combustion process and dissolve the carbon deposits. So when my 4.0SE started first experiencing stuck valve symptoms last year I decided to follow their lead and adapt their process to my Rover. The basic idea is the same with all of the products get the motor up to operating temperature and spray a pint or so of cleaner into the intake tract while the motor is idling. You let it soak overnight and test, repeat if necessary. The best product of the bunch is OMC "Engine Tuner" now also sold as Systematched "Engine Tuner" since OMC went broke and Bombardier bought the assets. If you are going to try this on your rover there are some caveats: You must remove the Y pipe. These products are not safe for Oxygen sensors or Catalytic converters. You must introduce the product downstream of the Mass airflow sensor. You should not do this directly on your driveway, the dissolved carbonblack that sprays out of the exhaust manifolds stains. You will need to be able to reset OBD2 codes the ECU will notice the Oxygen sensors are not responding and trip the check engine light. You must change your oil after you are done. Some product is going to seep past your rings while it is soaking and while it is safe for all seals it is a poor lubricant. This process will cost you a weekend and $50-100 provided you don't break any exhaust studs I have been directly involved in treating four 4.0 liter powered Rovers all with complete success. Also update your ECU if the dealer says you can otherwise you are going to be right back where you started. The sterndrive manufacturers also produce preventative products the best deal of which seems to be Yamaha marine "Ring Free" now "Ring and Valve Free" on some packages. This product is certifed as Oxygen sensor and Catalytic converter friendly for their new motors that incorporate both. ../17/1774.html> | ||
| john heath (Jheath6) Member Username: Jheath6 Post Number: 129 Registered: 09-2003 |
here is and article that has a couple of links on how to do it but i have heard of a similiar procedure to what Bill is talking about from a mech. friend of mine i will ask him again and see what he said to me http://www.robisonservice.com/servicedep/rover_advice1.asp | ||
| john heath (Jheath6) Member Username: Jheath6 Post Number: 131 Registered: 09-2003 |
ok i talked to my friend and he said that for a quick fix he used to take the vaccum line off the pvc valve and keep it hooked to the intake and while engine is running put the end of the hose into a bottle of fuel injection cleaner and let it suck it into your engine he said the engine prob. will stumble a little while doing it but he said not to do this to many times in a row because it cleans all the oil off the moving parts at the same time. but he said it will work unless the valves are extremely carboned up | ||
| charles pastrano (Charles) Senior Member Username: Charles Post Number: 305 Registered: 08-2002 |
bg44k every 12k and a qt of rislone every oil change. 150k no problems | ||
| Eric Olsen (Eric_olsen) Member Username: Eric_olsen Post Number: 88 Registered: 02-2003 |
Mike, do you by chance have any coolant issues? | ||
| Mike Ford (Mford) New Member Username: Mford Post Number: 4 Registered: 08-2003 |
Eric, I haven't had any coolant isssues, but the dealership did spend quite a bit of money on the engine (under factory warranty) last summer while doing the 30K maint. cleaning out oil grime etc. They said that the previous owner didn't change the oil much. I remembered after posting this that when I bought the Disco I also purchased an extended aftermarket powertrain warranty so I will probably bring it to the dealership this week to have the valve job done. I can live with the deductible better that the $2,000 plus that this would cost to fix. Thanks for the help with the diagnosis guys. Discoweb is an awesome tool. Mike |
