My Catalytic converter might be going
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TReK
Joined: Aug 2011
Posts: 3,167
Likes: 87
Do you have an ultragauge?
If so, what are your avg mpgs, and what are your instant mpgs when cruising at 70 on a flat road?
My average is 13.3 and Ill be at about 16-17 at 70 which I think is pretty normal for the 4.6 D2.
Mpgs obviously dont pinpoint anything, but lower than normal can be an indicator of something going on with the drivetrain.
If so, what are your avg mpgs, and what are your instant mpgs when cruising at 70 on a flat road?
My average is 13.3 and Ill be at about 16-17 at 70 which I think is pretty normal for the 4.6 D2.
Mpgs obviously dont pinpoint anything, but lower than normal can be an indicator of something going on with the drivetrain.
Yes I have Ultra Gauge installed though I still have not figured out everything on it. Ill have to get back to you in the question. Wont be on the highway again until Monday. Knock on wood.
Front drivesahft is new aftermarket fully serviceable and i rebuilt rear shaft.
Recovery Vehicle
Joined: Jan 2012
Posts: 1,126
Likes: 11
From: mini soda
Also, with this weather, make sure youve been driving with the engine at operating temps for a few minutes before noting the instant mpgs. If its 0* outside, Ill get like 10mpg going 50 until all the moving parts get comfy cozy.
Last edited by pinkytoe69; Jan 4, 2014 at 10:21 PM.
Thread Starter
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TReK
Joined: Aug 2011
Posts: 3,167
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Im still not ruling out cats as the problem. My google search found many stories of people experiencing same symptons with their vehicle not exceeding past 60 mph on the highway. Cats fixed their problems in some cases. But when I go to DAP I will have them do the compression test. Is there anything else I should have them check in regards to the engine while its there? Be it not tearing my engine apart.....
Recovery Vehicle
Joined: Jan 2012
Posts: 1,064
Likes: 16
From: San Antonio,Tx
Not getting any power could be a fuel issue. It might be worth it to do a fuel pressure test to make sure the pump is good. Have you ever had trouble starting in the morning?
You may also have clogged injectors. A good fuel injector cleaning might help you out. OTC makes a good at home cleaning kit for fairly cheap or you might be able to find a local shop to do a 44k injector cleaning. If you want to make sure the injectors are cleaned really good then make sure they do a real injector cleaning and not just dump a can in your gas tank.
1171 and 1174 is a vacuum leak more then likely. I have had those codes and it turned out to be a lose intake tube @ the throttle body. Someone else with those codes had bad injector O-rings. Basically it could be a leak anywhere after the MAF. If air gets in past the MAF then the gas-to-air mix will be off and it could cause the power loss you are talking about. I found my leak by doing a smoke test with a cigar. I made a thread on how to do it here: https://landroverforums.com/forum/di...s-cigar-54235/
You may also have clogged injectors. A good fuel injector cleaning might help you out. OTC makes a good at home cleaning kit for fairly cheap or you might be able to find a local shop to do a 44k injector cleaning. If you want to make sure the injectors are cleaned really good then make sure they do a real injector cleaning and not just dump a can in your gas tank.
1171 and 1174 is a vacuum leak more then likely. I have had those codes and it turned out to be a lose intake tube @ the throttle body. Someone else with those codes had bad injector O-rings. Basically it could be a leak anywhere after the MAF. If air gets in past the MAF then the gas-to-air mix will be off and it could cause the power loss you are talking about. I found my leak by doing a smoke test with a cigar. I made a thread on how to do it here: https://landroverforums.com/forum/di...s-cigar-54235/
Last edited by Jared9220; Jan 5, 2014 at 12:09 AM.
Thread Starter
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TReK
Joined: Aug 2011
Posts: 3,167
Likes: 87
Not getting any power could be a fuel issue. It might be worth it to do a fuel pressure test to make sure the pump is good. Have you ever had trouble starting in the morning?
You may also have clogged injectors. A good fuel injector cleaning might help you out. OTC makes a good at home cleaning kit for fairly cheap or you might be able to find a local shop to do a 44k injector cleaning. If you want to make sure the injectors are cleaned really good then make sure they do a real injector cleaning and not just dump a can in your gas tank.
1171 and 1174 is a vacuum leak more then likely. I have had those codes and it turned out to be a lose intake tube @ the throttle body. Someone else with those codes had bad injector O-rings. Basically it could be a leak anywhere after the MAF. If air gets in past the MAF then the gas-to-air mix will be off and it could cause the power loss you are talking about. I found my leak by doing a smoke test with a cigar. I made a thread on how to do it here: https://landroverforums.com/forum/di...s-cigar-54235/
You may also have clogged injectors. A good fuel injector cleaning might help you out. OTC makes a good at home cleaning kit for fairly cheap or you might be able to find a local shop to do a 44k injector cleaning. If you want to make sure the injectors are cleaned really good then make sure they do a real injector cleaning and not just dump a can in your gas tank.
1171 and 1174 is a vacuum leak more then likely. I have had those codes and it turned out to be a lose intake tube @ the throttle body. Someone else with those codes had bad injector O-rings. Basically it could be a leak anywhere after the MAF. If air gets in past the MAF then the gas-to-air mix will be off and it could cause the power loss you are talking about. I found my leak by doing a smoke test with a cigar. I made a thread on how to do it here: https://landroverforums.com/forum/di...s-cigar-54235/
Premium fuel always used and I pour in a bottle of fuel injector cleaner once a month. No real problems during startup, though if it gets really REALLY cold then there is slight hesitation for an extra 2 seconds but she always starts right up. Ive read your cigar thread and I have a cigar in my glovebox waiting to be lit for the smoke test, just been to dam cold to do anything lately. I do not know the capabilities of DAP but hopfully they can perform the fuel test as well. hate to have to go to different shops for a simple test but will do what needs to be done.
Have not noticed any fluid leaks either. Coolant is good, oil is good ever since I tightened the valve cover bolts as suggested on this forum. No oil light. No sporadic idling etc.
Camel Trophy
Joined: Nov 2012
Posts: 3,717
Likes: 248
From: Longview, Texas
If you suspect cats you can remove your front O2 sensors and take it for a test drive, but I've only done that on very short drives at 40mph and below. Just screw them out, zip tie them out of the way, and make note of what might get melted by hot exhaust gas. This would relieve the pressure caused by a clogged cat. I would remove the sensors in both sides at the same time. Note that driving too long this way can result in valve damage. It is also loud enough to scare the neighbors and get you pulled over.
The hesitation on starting in cold weather may be normal... But it may not. That's how my head gasket leak began to manifest.
I have a 2006 Nissan Titan that wouldn't go over 15 mph and kept dying. The dealership said I needed a new engine (13k installed) so I drove it home and pouted for about a week. One day I had the bright idea to drop the exhaust and it roared to life. A long screwdriver and a vacuum cleaner... It has run fine for about 4 years since the "operation". But if yours is cats, it obviously has a lesser problem. If it is any help my (4) cats were fouled by a persistent misfire caused by two bad spark plugs. Also, coolant in the exhaust can clog the cats.
The hesitation on starting in cold weather may be normal... But it may not. That's how my head gasket leak began to manifest.
I have a 2006 Nissan Titan that wouldn't go over 15 mph and kept dying. The dealership said I needed a new engine (13k installed) so I drove it home and pouted for about a week. One day I had the bright idea to drop the exhaust and it roared to life. A long screwdriver and a vacuum cleaner... It has run fine for about 4 years since the "operation". But if yours is cats, it obviously has a lesser problem. If it is any help my (4) cats were fouled by a persistent misfire caused by two bad spark plugs. Also, coolant in the exhaust can clog the cats.
Last edited by Charlie_V; Jan 6, 2014 at 10:06 AM.
Hi, just a quick note I replaced my Cats 2 months ago. Bought new ones for $50 each then had them welded in for $150.00 Truck is running great and sounds much better.
sold my old Disco 2 cats on ebay for $325 for both of them. If you get new cats keep the old ones and sell them.
sold my old Disco 2 cats on ebay for $325 for both of them. If you get new cats keep the old ones and sell them.
Recovery Vehicle
Joined: May 2009
Posts: 1,191
Likes: 28
From: Charlotte, NC
As mentioned at the very top I do have codes but I have already posted them on this forum. Pending codes: P0501, P0150, P1171, P1174. Check engine code: P1415. Cats aside I also have a leak on the side of my muffler silencer (# 3): Discovery II Exhaust Pipe, Hanger, Muffler - Rovers North - Classic Land Rover Parts .
Ive heard that the muffler leak might be a easy fix if I bring it to the right place. What about the cats? Information I gathered suggested a clogged cat. Can these been cleaned out unclogged? I know that if and when I learn that the cats are bad or burnt out, that I need to also determine what made them go bad. Ive heard that running to lean or burning a lot of oil can wreck havoc on the cats. Either way its beginning to seem as though I need to replace the entire exhaust system.......
Ive heard that the muffler leak might be a easy fix if I bring it to the right place. What about the cats? Information I gathered suggested a clogged cat. Can these been cleaned out unclogged? I know that if and when I learn that the cats are bad or burnt out, that I need to also determine what made them go bad. Ive heard that running to lean or burning a lot of oil can wreck havoc on the cats. Either way its beginning to seem as though I need to replace the entire exhaust system.......
Did you check these threads?
https://landroverforums.com/forum/di...1-59743/page2/
https://landroverforums.com/forum/di...es-light-6534/
Last edited by DiscoRover007; Jan 6, 2014 at 04:32 PM.