Tiguan :: 2009 - CEL On / Stay Lit - Car Would Run Rough After Start And Smell Of Gas


Apr 7, 2013

Recently picked up a 2009 Tiguan with 150.0k kms. I had my shop swap out the old spark plugs shortly after purchase along with oil change and quick go through. Shortly after I had the CEL come on with a read on the #2 injector. Through this time the CEL would come on/stay lit, the car would run rough after start and I could smell gas.

So back to the shop. I swapped out a coil to ensure it wasn't a coil issue with the same result, CEL on injector #2. I had a new injector put in on number #2 along with the new seal received when purchased. While running much more smooth now, I again have the CEL back on again on injector #2. This morning at start up the CEL came on and flashed this time a few times before staying lit. (misfire?).

I've read that it could actually be another injector which is causing #2 to fault but how do I determine which and if this is actually it?

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I heard of spraying Lysol through the air intakes, is it the one right below the windshield wipers? I know I should probably take out the cabin air filter and give that a thorough cleaning as well. Is there anything else I should do to eliminate the smell?It's getting to be pretty bad..

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Tiguan :: Running Rough During A Cold Start / Random Cylinder Misfires

I've got a 2009 Tiguan with 65k miles on it. A few weeks ago I noticed some issues with running rough during a cold start. I only noticed because the engine would vibrate considerably more than usually for the first few minutes of operation, and would idle at around 1050-1100rpm instead of the usual 750rpm. After warm up, things were fine. Suddenly the issue got bad real fast - wife was out and the MIL light came on, EPC light came on, and the car was running extremely rough. We managed to drive it home (2 miles) doing under 20 the whole time on side streets. Once I hooked it up to my OBD reader, I was seeing cylinder misfire codes on all four cylinders.. P0300, P0301..P0304, all five codes simultaneously.

Since the car was due for an oil change and hit 65k miles recently, I decided to throw new plugs in there to see if that would work. It did, at first.. A day or two it ran completely fine, no rough starts, no misfires, I thought I had solved the problem. The old plugs had some deposits on them and were original, so I thought I was in the clear. Two days later, same thing happened again.. EPC light, barely running and misfires on all four cylinders..

I read up some online and decided to order new ignition coils. Took a few days, but I got four new coils and threw them in. Again, problem solved it seemed. No more EPC light, misfire codes didn't come back and no more rough starts. I drove a good 40 miles with no problems at various speeds, but started noticing some misfires during acceleration (slightly rough acceleration, almost feels like a back and forth rocking motion, very slight). Sure enough, after a cold start I'm seeing the engine run a bit rough again with misfires. This time, only P0304 (misfire on cylinder 4) is thrown, and it only shows up as a "pending code" (engine light flashes for a few moments during start, but does not stay on).

I checked my connections, swapped the plugs and coils in what I thought were cylinders 3 and 4 (closer to the driver side), nothing. I swapped what I think are cylinder 1 and 2 (passenger side) just to be sure, but still nothing. At this point I'm pretty lost. I know enough to be dangerous with a carbureted engine, but am lacking in knowledge when it comes to a fuel injected turbo charged VW engine. It seems to be cylinder 4 misfiring consistently at this point according to the OBD reader.

Also of note.. I had some misfire problems last year, and had my intake manifold replaced as part of a recall (also had carbon deposits removed at the same time). Can a carbon build up occur this fast? Can it be the injectors?

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The first time the dealer replaced the fuel pump control module, then when it happened again they said it was the fuel filter. It has now happened a third time.

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I noticed it ran a little rough on start up but smoothed out after it warmed up so I wasn't too concerned. CEL was on but it ran fine. I got the truck from my FIL and he said that it just had new hoses put on and the CEL came on after that. I noticed a slight coolant smell and after a big leak by the water pump I discovered that the guy who fixed it didn't have any of the hose clamps as tight as they should have been.

The heat went from really good to non-existent the last few weeks, never had any over heating issues though. Last week I was driving it to work and the temp gage spiked the light came on. I stopped and checked the coolant and it seemed fine. After I sat for a minute or two I checked the temp and it came back to normal. I figured it was because I let some pressure out of the system. It got hot again when I got to work but didn't spike at all driving home. I figured the water pump or t-stat was bad.

I replaced those on Saturday. When I filled the coolant up it ran rough and smoked but stopped and ran fine. Temp was fine but heat was nada. Today same thing, smokes like a steam engine for a few minutes then runs fine. Coolant smell is noticeable. I had the codes scanned and got P0303, P0174, and P0171.

I am thinking intake gaskets, since it seems to be an issue with these engines. I am going to fix it before I get a hydro lock situation, so what would be the next thing to look at before deciding that they need changed? Do I need any Ford specific tools to do this job?

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Also, it has a rough idle. Today it idled down so low when we were at a stoplight it sounded like it was going to stall.

We've changed the fuel filter, spark plugs, and cleaned the injectors and throttle body. The mechanic has run diagnostics which didn't indicate anything other than rough idle.

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The hotter it is outside the more this accentuates. I used to have a 2012 GTI that would do that every now and then, especially at the start of the Spring but it would quickly go away after the first few days or some Lysol.

I assume this car was parked outside the dealership for many months so that may have caused it. I've taken it back to the dealer twice, first time they said they ran a full deodorization, whatever that means, and second time they said they couldn't find anything wrong.

I looked at the air cabin filter, looks brand new, only strange thing was the cover panel under the glovebox was missing, maybe from when they replaced the filter after my complaints. Car is sitting at 1400 miles now, if anything the smell is now worse and I'm taking it back to the dealership for a 3rd time tomorrow morning...

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