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  #21  
Old 06-17-2013, 05:45 AM
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Check back pressure with gauge at front 02 sensor for cloged cats. Check fuel pressure at rail. Autozone may be able to help.
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  #22  
Old 06-17-2013, 05:49 AM
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Forgot EGR valve to.
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  #23  
Old 06-17-2013, 08:55 AM
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idle is actually when it runs the best, its nice and smooth at idle. it tuns the worst around 1200-2600 rpm both in park and while driving. i havent actually checked the fuel pressure but when ive relieved the pressure on the rail several times it seems really strong. no egr on the 2000 5.9, however the cat is one of the only things left that i can think of, ive tried just about everything else. when i was messing with the o2 sensors yesterday i did notice that the cat and the exhaust and gases seemed abnormally hot, anyone know if those are signs of a clogged cat ? I had a bronco years ago and just took sa big pipe and a small sledge hammer and hollowed out the cat and never had a problem. we dont have emissions where i live or where im moving so i could just gut the cat on this truck to, unless anyone knows of any problems that might cause ?
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  #24  
Old 06-17-2013, 09:28 AM
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Well That'd be my next step as mentioned above to check the back pressure at the upstream 02 sensor.

Your exhaust should not be that hot and is an indication of a restricted catalytic converter.

Yes you can hollow it out but there is another option. Check the local prices at the local scrap yards and see what the old cat is worth. If you find a good one you'll get around $100-$125 for a large domestic converter. An aftermarket replacement can usually be found for less than you'd get for the old one. But do the research FIRST.

You may actually make a profit by changing the cat.
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  #25  
Old 06-17-2013, 10:01 AM
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There is no EGR on a 2000.

Have you at least just unscrewed the front O2 (leave on harness but ziptie safely) and then driven it to see of any change?

Have you looked closely at your plug wires and made sure NONE are in contact and parallel to eachother? I don't have the TSB link handy, but this can cause misfires also.
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  #26  
Old 06-17-2013, 05:44 PM
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Like the guy on the video said you should probably disconnect the battery when you are attempting different diagnosis so the ECM resets.
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Old 06-17-2013, 09:34 PM
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well I switched the injectors around and installed new O-rings while I was in there today, still cant get it to throw a code but of course still running like crap.

I agree with the cat scrap yard idea however none of the scrap yards around here will buy cats unless they buy the whole vehicle, apparently there was a big problem with people stealing cats and selling them to scrap yards because of the high value so they wont buy them now. not sure if its statewide regulation or what. however im going to just hollow out my cat tomorrow to see if that solves it since im planning on eventually doing a full exhaust from the headers back once I get moved and settled in my new job (who wouldn't want to hear that big 360 talk ???). A clogged cat does seem like it could be a problem however not sure if it would make it run that bad and it was only misfiring on 3 of the cylinders, but we will see soon.

yes I did unplug both o2 sensors with no change, and I even replaced the front one, also with no change. im running out of possible causes and time. the only things left I can even think it would be is cat, injectors (hopefully the truck will tell me soon), crankshaft sensor, camshaft sensor. other than those ive tried everything short of replacing the engine.. and as far as the wire routing tsb, I have a print out of it and followed it word for word. good thing I got this truck cheap....
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  #28  
Old 06-17-2013, 11:35 PM
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One thing everyone is forgetting here is this is a 5.9 with ma's delightful keg. Do a quick check by removing the throttle body and taking a look down the passenger side of the back of the keg. If there is a pool of oil in there you have a vaccum leak caused by the fact ma put a steel plate on an aluminum manifold and with the differences in heating and cooling rates the gasket between moves and causes a leak, which in turn has been know to cause misfire codes. You can reseal it temperarily to get you by by removing the intake and using a new gasket or silicone gasket maker but the long term fix is the Hughe's repair kit that uses an aluminum plate. While you have the throttle body off it would be a good time to clean it with some carb cleaner or throttle body cleaner before replacing it.

OP you said you unplugged the O2 sensors but did you as one other poster said remove the precat sensor and tyewrap it out of the way so it doesn't bounce around and go for a drive. It will be noisy but if the engine runs better you will know that the cat is plugged because you have released some of the backpressure out the O2 sensor hole.

Did you replace the rotor when you did the cap?

Good luck

Last edited by namretsud; 06-17-2013 at 11:38 PM.
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  #29  
Old 06-18-2013, 05:28 AM
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Don't rule the rear 02 sensors out I had one go and my truck ran like crap.
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  #30  
Old 06-18-2013, 09:59 AM
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If I run a K3 code check on my truck, every problem it ever had will come back. It just won't clear them misfires etc...

I'd try resetting the ecm and DO NOT check the code and take it for a ride.
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