2.0 Rough running on morning start then works OK --- No VCDS fault codes

[Turbo_Boss]

Hello Guys,

I have a 2008 MK4 2.0 with only 53,000kms. At 40,000Kms I put new OEM spark plugs.

Just recently, every morning when I start the engine is sputtering and rough running. The engines want to die but I give a little gas, and run rough like it is only firing on two or three cylinders.

When it gets to the normal operating coolant temperature it runs without any problem and I can use the AC.

Its only give me this problem on the first start of the day.

Does not have any MIL light on the instrument panel. I scan it with VCDS-Lite and do not found any fault codes.

The only thing that’s come to my mind is to change the Green Coolant Sensor.

Any other advice?

THX for your time and help

Isaac

[madglf3]

Hello Guys,

I have a 2008 MK4 2.0 with only 53,000kms. At 40,000Kms I put new OEM spark plugs.

Just recently, every morning when I start the engine is sputtering and rough running. The engines want to die but I give a little gas, and run rough like it is only firing on two or three cylinders.

When it gets to the normal operating coolant temperature it runs without any problem and I can use the AC.

Its only give me this problem on the first start of the day.

Does not have any MIL light on the instrument panel. I scan it with VCDS-Lite and do not found any fault codes.

The only thing that’s come to my mind is to change the Green Coolant Sensor.

Any other advice?

THX for your time and help

Isaac

I had something that sounds similar a few months back and it turned out to be the coolant sensor.

[Turbo_Boss]

Hello

I went to VW & AUDI dealers in another car in order to not start the 2.0 engine and not getting hot.

Neither of them have the Coolant sensor. So I just bought from them the O Ring for $15.00

Went to a aftermarket place and got the Coolant sensor for $10.00

The sensor my engine use is grey with 2 pins part No. 06A 919 501 and I bought the same one since the green one have 4 pins for the electrical connector.

Piece of cake installation in less than 5 minutes.

Start the engine and it started immediately without any problem (No sputtering neither rough running) I turn on the AC and works OK.

Since the problem is only on the first starting of the morning, I will check it this week to see if this fix cure the problem.

Here are some pics of the old parts.

I will keep you guys updated

Thx for your time and help

Isaac