Golf IV / Jetta IV :: CEL Flashing When Floor 2004 1.8T GLI


May 17, 2014

For a while i've been dealing with this problem but its low priority because I never floor my car. The car drives perfectly fine even if you hold it 5-10 lbs of boost. When it goes into 18-20lbs it wont hold.

Symptoms : Only when I floor it SOMETIMES the car bogs down and the check engine light flashes for a little and eventually goes away. Now this doesn't always happen. Sometimes I floor it and everything works fine. I don't have vag or a laptop to hook it up and see what code is thrown.

The car is a 2004 1.8t GLI

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Anyways, dug it out to start it. Started right up, however after a bit the MIL began flashing. It was running a little rough. Took out my code reader and engine misfire cylinder 4 came up. The rpms are varying by 75~100 every few seconds, however nothing rough. It seemed to rev fine.

Before I put it away I got my brother to put some fuel stabilizer in the fuel. He now tells me that he put some in the oil too since it said "oil stabilizer" as well. It was a seafoam type brand... Not impressed with him there.

My question is could this just be the car waking up? Should I let it run for an hour or two to see if things work out?

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I have a 2004 Jetta 1.8t 6speed, I recently bought it from a person(my first VW ever) so just trying to fix some things on it, One thing that I'm stuck at is My CEL, it keeps flashing the code P0501 and some random misfire on my cylinders, I have reset it and they keep coming back.

when I put about 10-15% throttle it revs up fine, no misfire or hesitation until the fuel gets cut off around 5500, which is 1k below factory red line, does not hit a thing like the rev limiter where it pegs off the top multiple times just fuel cuts off.

If i put anything above the said pressure the car then begins to misfire and lots of hesitation and that's what causes those codes to go off.

I've been reading many things pointing towards the engine speed sensor or the wiring. Occasionally my fuel/temp gauge quit working but I believe that is a separate issue all together.

So really trying to narrow down what is actually causing my engine to hesitate at low rpm.

Also i might note when I'm in neutral I can go wide open throttle and the car revs fine until the cutoff and only does the bog down when it's under full load. It sorta feels like the possible misfire is due to bad air/fuel but really do not know.

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My question is: Even though my brake pedal goes directly to the floor, how am I getting the car to stop at the very end of the push? Do the brakes somehow work as a fail-safe even the the hydrolics are basically toast? I know that's a long shot, but it wouldn't be the first time I've been shocked over systems in this car.

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So last evening, I went to start my car and the clutch pedal went straight to the floor with no resistance. Car started and was extremely hard to get into every gear. Felt like the only thing pushing the clutch pedal back up was the spring underneath the pedal itself. Clutch pedal was 100% just the day before. Got the clutch line bled (vacuum bleeder) and it worked fine again.

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Here's my question. Recently my muffler fell off the back of my car and was dragging on the ground. The front bracket had snapped off and so had the pipe right where it comes out of the front of the muffler. I want to replace with the stock oem muffler but i can't afford it right now. My question is can i just take the muffler off for the time being so it wont drag on the ground? Will this harm the engine or be completely absurdly loud? Is this even legal....

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1st time he said the fluid was filthy, and he emptied the system and put in clean fluid. Worked for a little while and then we were back where we started. Second time he replaced a couple parts on the clutch, replaced this fluid, and this time it ran like a dream for a little over a month. Then the problem just returned. Again he says the fluid is filthy, and now we are looking at replacing the master cylinder and again changing the fluid. The theory behind why this is happening is that my mother in law let the car sit for half a year before passing it on to us. She didn't do much driving the 6 months before that either. I've done research, and this doesn't appear to be a common problem by any means on these cars.

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I have a 2005 VW jetta 2.0 engine 5 speed. Just replaced right control arm spark plugs wires and coil pack. I had a misfire only when it rained and it got rid of it! Driving home in stop and go traffic and My car stalls out a hear a bang and my clutch pedal drops to the floor. I had noticed some fluid loss but nothing was low I checked everything before I left work. I finally get it towed but I can not shift to first I can shift to 2 3 4 5 and reverse. I was in first when it stalled out during stop and go traffic while it was in first gear and i had the clutch pressed in. Everything Ive google says it is more than likely the Slave cylinder that is right below the air box. I found some that said it could be the release bearing in the gearbox for the tranny...

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I tried to do a compression test but I didn't prepare properly, I thought you left the coil pack plugged in and the fuel fuse. Now I have a CEL that *was* flashing saying cylinder one is misfiring though it has stopped flashing. I drove it 13 miles home and it did improve but its still running rough. Very reminiscent of when my bad coil pack was still in there, a real lack of power.

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It all started a few months ago.... I started my car, and it started noticeably misfiring, CEL flashing and everything. I scanned it with my vagcom and it came up Cylinder 1 Misfire and Random Multiple misfire. I popped the hood, made sure everything was seated correctly, and shrugged.

Ordered some new wires for it, since it had 80k miles on it with original wires, I figured why not. The misfire didn't come back.

A few weeks later, same thing happened. Misfires, flashing CEL, same codes. I ended up driving it the 5 minutes to work anyways and figured I'd look at it later after I got off.

8 hours later I started it up again, ran like a champ, no CEL on. The problem didn't come up again for 3-4 weeks.

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