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Sedans Volkswagen Jetta Volkswagen Jetta Maintenance and Repair
6276 messages, Last post on Dec 02, 2009 at 9:07 PM
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Replying to: Mr_Shiftright (Nov 02, 2008 12:06 pm)
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Replying to: bridgeatl (Nov 02, 2008 6:04 pm) |
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Replying to: bridgeatl (Nov 02, 2008 4:26 am) BOTH of my daughters 2001 VWs had their MAF replaced for free under this "extended warantee". Since I have a VagCom , I was able to diagnose their bad MAF. (running lean and/or rich) One way to help diagnose a bad MAF is to disconnect the electrical wire and drive the car. If it runs better, the MAF is definatly bad.
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Replying to: bridgeatl (Nov 02, 2008 6:04 pm) A "burnt" sparkplug would be bright white on the tip because everything except the ceramic has burned off of it. A competnet mechanic can "read" sparkplugs and determine a lot about the condition of an engine. (fuel mixture, rings, valvestem seals, ignintion system, fuel grade...etc) Too bad there are not many COMPETENT mechanics around anymore.... many of them just hook computer to car and have little clue how to REALLY diagnose a problem. Also, many of them are paid based on HOW MANY PARTS THEY SELL and not by HOW MANY CARS THEY FIX. I have always wanted mechanics to be paid based on FIXING a problem... (not on TRYING to fix it) 8-) With that said - If all of your sparkplugs look about the same condition, this DOES NOT point to an ignition nor a mechanical problem and instead points to somthing IN COMMON to all of the cylinders. (MAF sensor, O2 sensor...etc.)
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Replying to: bpeebles (Nov 02, 2008 7:05 pm) Which one?....and how could you tell?....is there a separate electric wire for both of them? And What do you mean, "If it runs better..."? Because the car runs fine....it's smooth and shifts consistently for the most part...but the Auto Parts Store Computer Reading was giving the Too Lean/Fuel Injector problem reading.....so how would I do that?.....would I run it without the sensor and see if the Auto Parts store Computer give the All systems Pass Reading (or whatever the technical term for all systems pass)?....Would the computer show the MAF sensor as "CANNOT BE READ" if I disconnect it?....Let me know....thanks....I seriously think this might be the problem. |
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Replying to: bpeebles (Nov 02, 2008 7:15 pm)
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Replying to: bridgeatl (Nov 02, 2008 7:31 pm) So what i'm saying is that a code that says something like "misfire" or "bad injector" could be caused by many things, and the idea is not to replace all those things at once and then say "see, I solved it" (at the owner's great expense).
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Replying to: Mr_Shiftright (Nov 03, 2008 8:24 am) But most of us are happier paying for new parts to be installed, than we are paying diagnostic charges, as in: it would have been $106 just for a further examination and possible dianosis. I just wasn't sure I was up for that
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Replying to: jeffyscott (Nov 03, 2008 10:24 am) I'm certainly not going to pay for a wrong diagnosis. I can do that myself 
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I am having power loss on my 1999.5 Jetta TDI. The whole story is important here probably. Head needed rebuilding, has new camshaft, timing belt, tensioners waterpump since it was all open. I also had the turbo actuator valve replaced (the bladder gizmo behind the engine). Right after that the turbo worked great, car ran like a dream for about a weak. I then noticed when the turbo would spool when at high RPMs that it would skip and then plop into limp mode. It has gotten progressively worse so that now it will drop off almost from the first acceleration in first gear. It will usually fix when the key is cycled. when I run the codes I get P0101 an P1550 (regular handheld jobby), and under the the Vag-Com there are also codes for the rear ABS sensors. So far to fix this issue I have replaced the Turbo Solenoid (up by the windshield with the hoses going to it), I have replaced the MAF....I have taken apart the hoses going to the air filter (all clear). I have visually inspected the vacuum hoses and though a little frayed don't see any breaks. The air filter is relatively new. The connector plug (that plugs into the MAF) is a replacement plug so it leads me to believe someone looked at replacing that before I came onto the scene. I am thinking I should check to make sure that is wired well...but what else should I try. Any advice, happen to anyone else? I am reaching the end of my wits thinking about it....need some things to check so I feel like I am sniffing out the problem....give me your best shot! Oh something else you should know. The engine light doesn't work it was somehow disconnected or blown, I wager disconnected so they could sell the car.
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