Passat (B5) :: 2003 W8 Engine Light On And Car Just Bogged Down Hard When Coasting In Neutral


Jul 21, 2011

So I was driving my car about a week ago when it decided to "die" on me for about 2 seconds. I was coasting in neutral (tiptronic) to a red light when the car's engine light popped on and the car just bogged down hard. I threw the car into drive and the problem went away immediately. I haven't had the problem since then, but I'm also not allowing the car to coast in neutral anymore.

I was thinking about bringing the car in to have them read the computer but is this something that they would be able to trace back or would I be out the 90 bucks for nothing? I have absolutely no clue what this could be.

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I can see why its not advised while the engine is off (i.e., towing), but if the engine is on, torque converter turning, transmission fluid pumping, I can't see where it would hurt.

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Ford - Thunderbird :: 1985 Turbo Coupe Dies When Coasting In Neutral

This problem has plagued my '85 Tbird Turbo Coupe for about a month. When I put my car in neutral while moving, the RPMs fall significantly below idle and then the engine usually catches itself and after about 5-10 seconds idles normally. If I do this at high speed (say 40 mph +), the RPMs fall to the point where the engine stalls and dies. If I do it at 25-40 mph, it will go down about 200-500 RPMs and then catch itself. If I do it at 15-20 mph, it will be just barely noticeable, and anything slower than that I can't notice it. It will also do this to some extent when I'm stopped if I rev the engine up really high and let it off, but it is far less noticeable. This car has had extensive work done to it in the past 6 months.

Most recently, I had the fuel injectors replaced, throttle body cleaned, IAC valve cleaned, and the vehicle searched for vacuum leaks. (most of that in search of the solution to this problem as well as to improve the general performance of the vehicle. A week before that, I also had a new fuel tank, fuel pump, and fuel filter installed. I've got a very small leak on the back of my muffler, no cat, and no other exhaust leaks I can find. I am getting a lot of black carbon out of the exhaust, but I have been running some fuel system cleaner through it. Also, the car sat for like 8 years before I got it, and the original cat became clogged and really gunked stuff up. I had all of the upper engine gaskets replaced, as much as we could get to cleaned internally, and the cat cut off at that point. Timing is very close to 10btdc. Could be 9.5, but just about right there. I double checked, no vacuum leaks that I could find with a can of carb cleaner. I tried checking for codes, but it's not even throwing me a confirmation code or anything, which is odd. But, my connector was pretty gummed up (I did clean it as good as I could) and just about anything wiring is suspect. I used two engine code readers that had previously been used on the car. Other than this, the car has plenty of power and runs fine down the road.

Here's the master list of what I've replaced in the past 6mo:

FUEL SYSTEM Fuel Pump (twice) Fuel Pressure Regulator Fuel Tank Fuel Injectors
ASSORTED FILTERS Fuel Filter (twice) Air Filter Oil Filter (several times) Oil Filler Cap PCV Valve
HOSES/COOLANT SYSTEM Nearly every Vacuum Hose Every Coolant Hose Heater Core (twice)
SENSORS AND COMPUTER STUFF Engine Control Module (ECM) Vane Air Meter (VAM) Idle Air Control Valve (IAC) Oxygen Sensor
STARTING SYSTEM/ELECTRIC/Misc. Spark Plugs and Wires (Motorcraft) Starter Solenoid Coil Pack Distributor
TFI Module Distributor Cap and Rotor Battery Timing Belt
EEC Relay Ignition Switch Tires Front Brakes Brake Master Cylinder (had previously been damaged) Front tie-bars Every gasket from the head up.

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Is it bad shifting from drive to neutral then back to drive going 40mph without pressing on the gas only coasting on a daily bases?

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I can grab that spinning drive shaft and it stops but I can still feel it vibrating. Let me reiterate, the left side is doing nothing and the right side spins while in neutral.

Is this normal? This doesn't seem possible. Is it just that there is insufficient friction without the outer CV joint to keep it from spinning, ie. even though in neutral there is sufficient friction on the flywheel from the clutch plate to give torque on the driveshaft. But what I don't understand is how the right one can turn like that while the left one doesn't. It would seem that something else is going on.

I guess a car's one tire can be spinning on ice while the other does not. It is just strange that this is happening in neutral.

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Sure enough two days later - it came back on - and I took it back. The mechanic had it in his shop for 6 hours. I picked it up, and now there is no light at all. Its the only light that has been affected.

The engine light does not even come on when you first turn the key in the ignition. I think the mechanic has purposefully did something to either the fuses or the wiring. [URL]

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My daughter has a 2003 Passat Turbo. Two weeks ago it started to run like crap with a check engine light on. I pulled the codes and it said multiple misfires. My buddy owns his own shop and said bring it down. He pulled the plugs and the spark plug holes were filled with oil. He changed the valve cover gaskets and replaced the plugs. Still ran rough with low fuel pressure so he replace the fuel pump and injectors. Still runs rough, when he pulled the air intake off there was oil in it. Could this have happened do to the valve cover gasket? The codes still read misfires. He said the turbo was full of oil also. Could the turbo be bad causing it to run like crap? Can it be rebuilt? I really don't want to go to the dealer.

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After a few seconds, I proceeded to give it some gas, and it engaged in gear and accelerated...until I got to about 25mph & rpms increased to about 2000 again. It did the same exact thing....seemed to shift back to neutral so that I could not accelerate. I had to keep pulling over to come to a stop, and then slowly proceed again. I wasn't too far from home & I made it. What this issue could be?

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Sometimes after the car runs for 10 minutes, then turned of for a few second then started up again, the problem goes away. Before this problem started, we would start the car in the mornings, and put in "R" , and only the reverse gear would light up. (which is the way it is suppose to work).

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