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Engine Specific Info and Questions => IDI Engine => Topic started by: colectb on December 30, 2009, 06:14:22 pm
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My Audi 5000 Turbo Diesel just recently became Anemic. I don't have time to start working on it until the weekend, so I thought I would like to get some suggestions to see where to start. Its most likely a breathing ( intake or exhaust) issue.
Here are the symptoms:
-It will NOT go above 3000 rpm and therefore will not pass 65 mph (~100 kph)
-I don't get my rather annoying black cloud anymore while flooring it, and I get about 1 psi less boost at full throttle.
-It idles and runs in lower rpms perfectly.
So it could be a plugged muffler, although I see exhaust smoke, just not soot. It could be something to do with the intake, or it could even be a fuel problem. Any suggestions?
Thanks in advance!
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Sounds like a fueling issue over a restriction in the intake or exhaust. Maybe your pressure line to your LDA came off or there is something wrong with the pump... Did your floor mat slip under your throttle pedal? lol
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Restricted fuel supply is my guess. Most likely suspect would be the fuel filter.
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im going with the clogged fuel filter too. my 5000 ran 100x better when i put a new filter on it. i fought fuel problems for days with it, then changed the fuel filter and it ran like a champ.
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Ok cool, I was going to replace it anyways and a new one is in the mail, but it seems kind of strange because I changed the filter a couple months ago. I must have a lot of crud in my fuel tank.
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Ok cool, I was going to replace it anyways and a new one is in the mail, but it seems kind of strange because I changed the filter a couple months ago. I must have a lot of crud in my fuel tank.
its not a bad idea to buy a cheap vacuum gauge and install it from the filter to the pump.
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Cole, there is another fuel screen inside the fuel tank. I replaced that filter about 10 years ago, and there have been a lot of miles put on that car since then. Lift up the lower part of the back seat to expose the access for the fuel gauge sending unit. Hopefully the tank is half empty or removing the cover will let fuel flow into the passenger compartment. I don't know how to describe the process for removing the screen (check the Bentley) but it is a plastic piece shaped like a shot glass under the sending unit. Be sure to replace it with another coarse screen, as the gas 5000's have a finer mesh screen that will clog up with wax when the fuel gets cold.
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Thanks Tom! I would have never thought of that nor known of that. Where did you get the replacement one at?
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Also Tom, you wouldn't happen to have any 5000 gasser intercooler piping lying around that I could buy from you, would you?
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No extra intercooling pipe. On that car I just used straight pipe and radiator hose for the bends. The Filter Screen I got at the dealership. The closest ones for you are in Fargo, or Maplewood.
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Also Tom, you wouldn't happen to have any 5000 gasser intercooler piping lying around that I could buy from you, would you?
josh (Powered by Spearco) has some 5000 piping and an intercooler i think, he might still want to get rid of it.
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I have the Gasser intercooler already, I just need to pull the turbo off of the car to see if I can rotate it to the position its in on the gas cars. If I can it should be pretty straight-forward to hook up the stock piping, so maybe I'll see if he will want to part with just the piping. And there is an Audi dealer in Sioux Falls, I'll give them a call.
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You don't have to pull the turbo off to rotate it. Just loosen the four 10mm bolts on the front and the discharge will move. The only thing you have to watch is the connection to the wastegate control. You don't want that to kink.
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his audi has a K24 on it. it doesnt have any wastegate control to kink. and it has 7 bolts holding the cold side on. i had to pull mine apart to get it to rotate, you might not have to.
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I used to own that car, I know what the turbo looks like.
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i take it you put something different on it then?
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Enlarge the photo on this page: http://www.turbocity.com/product_info.php?products_id=240 (http://www.turbocity.com/product_info.php?products_id=240) You can then see the connection nipples that a pressure hose connects to that activates the built in wastegate.
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Yeah, It's true, I have a spare K24 lying on my workbench too, there is definitely a hose there, on both of them.
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thats a different turbo from whats on my 83 engine. not much different, but it is. different flange and everything. or my tuirbo is bigger and made that one look small.
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I found a part number for the in-tank filter: 431 201 511 A Another thing you might try (but you're taking a chance with increase engine wear) is to use some 911 treatment, or a quart of gasoline in the fuel tank. If there is wax or ice in the line it might clean it out.
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I have been waiting for my shipment of various filters and oil cooler seals for a week now, and the amazing weather that just hit us delayed it further. I hope to have it by this weekend, and before the car is warm in the garage, I'm going to check the state of the fuel when I pull the sender and the filter to see if it's gelling (which I don't see why it would be since I use Howes). I don't know what could be wrong with this car besides that screen because last year I had a major problem with gelling, like anywhere below 15°F it wouldn't do more than idle. So if its actually gelling I'm going to try a new anti-gel and add a bit of gas. An article I read doesn't make me afraid to add a small amount of gas to the diesel, I'm sure its better than the alcohol in the Diesel 911. Thanks Tom for that part number, and thanks libbybapa, I'll check that out, but by now I don't think its anything more than restricted flow.
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Regarding the article on adding gas to diesel fuel, what year was it published?
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It was posted on a current forum if i recall correctly. basically saying its fine in *small* amounts and even if you filled a diesel with gas it just wouldn't run because of a different flash point or something. Don't think I would ever be this stupid. I have never done this, but wouldn't the small amount of gasoline be better than the nastiness that is Diesel 911? What's harder on the pump?
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The Bentley says using small amounts of gasoline is ok in a pinch, get the lowest octane you can. Octane and Cetane work against each other, and you need cetane. [edit]
I use power service anti-gel treatment, and when It gets really cold I use power service and seafoam together. Never had a problem yet.
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Ok, so I replaced the fuel filter and it did great for about 100 miles. Then it started acting up again, hesitating and not going over 100 kph or 3000 RPM. The boost gauge keeps fluctuating from these constant hesitations as well. Once I got it home, I replaced the fuel filter (absolutely NO gelling in the filter either), but this time there was no change. It has to be a fuel issue like everyone said, and I have to replace that screen like Tom said, but there is too much fuel in the tank still to do that. (I don't drive too often.) Does anyone have any other Ideas of what this could be in the mean-time while I burn through more of this fuel?
Thanks, and sorry for asking when I still haven't done one of the recommendations.
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Ok, so I replaced the fuel filter and it did great for about 100 miles. Then it started acting up again, hesitating and not going over 100 kph or 3000 RPM. The boost gauge keeps fluctuating from these constant hesitations as well. Once I got it home, I replaced the fuel filter (absolutely NO gelling in the filter either), but this time there was no change. It has to be a fuel issue like everyone said, and I have to replace that screen like Tom said, but there is too much fuel in the tank still to do that. (I don't drive too often.) Does anyone have any other Ideas of what this could be in the mean-time while I burn through more of this fuel?
Thanks, and sorry for asking when I still haven't done one of the recommendations.
something is restricting your fuel supply... on the audi's i think its possible to get to the pickup from the trunk maybe? or else you have to drop the tank... it would be a good idea to get a vac gauge on the fuel inlet just to be sure.
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An el-cheapo vaccum gauge can be a boat primer bulb, if it squeazes its self then you got a blockage.
No idea how much vaccum it takes to squeaze though but I do know it shouldn't at all. ;D
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The reason I mentioned the publication date is because back when diesel was diesel and not LSD or ULSD there was a lot more lubrication in it. You will wear your pump and injectors out much quicker if you mix with gasoline
As for the OP, Do you have compressed air? You could try blowing backwards through the line and seeing if that helps. If you have a check valve this won't work though. Actually if you have a check valve you should bypass it and see what happens.
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Here is the problem, I am about 50 miles away from my garage. I am at my University town and have limited tools... I will try to find the screen Tom was talking about after I get to at least a half tank, but until then I don't know, maybe I'll just bring it to a shop that will probably know next to nothing about these.
Can you elaborate on the pickup? I have access to the sender without dropping the tank from my back seat, but like I said, I need to burn off about 5 more gallons before I want to open it up.
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Is it possible for you to do a lot of low speed driving an idling to burn off 5 more gallons. If nothing else warming up the fuel in the tank from the return line might dissolve a little wax.
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i could dump 5 gallons in my audi, and drive around for most of the week, didnt drive very far, but i drove all week. thats what sucks about having such fuel efficient rigs.
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Yeah, it doesn't use much unless I'm on the intersate, then I only get about 23-25 mpg :( But I should have enough gone by the end of the week to look in there. I'll keep everyone posted on what I figure out. This is so frustrating! I almost want to think I made enemies with someone and they dumped something in my tank. It's not a gelling/ wax issue at all either.
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I took a couple pictures but I can't seem to find the attachment button. Any help here?
But anyways I can see the fuel pickup and I'm guessing the pre-filter is the blue part of that which reads: "nur diesel only", is it not? I just don't know how to get the thing out. I didn't want to start tugging on it without knowing. How do these come out?
Thanks.
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bump on how to remove these... Do I just pull up with a pliers?
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It was about 10 years ago, but I think I just used a long needle nose pliers. If you check your PM's you'll find my email. Send a photo to me.