VW Golf 4 2.0 AZJ Engine: Misfire, Power Loss on Wet/Cold Days, Idle Issues, Thermostat Replacement

I warmly welcome. I have a VW golf 4 combi engine 2.0 115km, symbol AZJ. I've had it for two years. After firing on damp days or on cold days after acceleration, regardless of what fuel I have the ignition on, it starts to jerk slightly and I have no power, the problem disappears after driving a few kilometers when I get the right temperature (about 60 ') then it accelerates it flows in higher gears sometimes jerks when I move and when I throw a double. It wavers slightly at idle regardless of the temperature. In June, I replaced the ignition wires and candles (all for NGK) I'm thinking about replacing the coil and modules, what do you think. Fall is coming and you know it will be cool and humid. I would also like to add that I think I have a thermostat to replace I am heating well but it does not catch the full 90 ". And if in your opinion the coil to be replaced is it a complicated operation?

Hello. It looks like a module coil. The replacement is not difficult, see if it is cracked visually.

sulof1601 wrote:

Hello. It looks like a module coil. The replacement is not difficult, see if it is cracked visually.

it is not cracked. Tell me more about the trade. What to unscrew idt. How long does it take

You detach the HV cables and one ankle, and probably four screws. You have good access to everything from the front. You changed the wires, you know where it is 20 minutes and that's it.

sulof1601 wrote:

You detach the HV cables and one ankle, and probably four screws. You have good access to everything from the front. You changed the wires, you know where it is 20 minutes and that's it.

now just which coil to choose

Beru albo NGK

sulof1601 wrote:

Beru or NGK

http://www.e-ngk.pl/ngk-u2011-cewka-zaplonowa-ngk-do-skoda-vw-48038-p-4097.html according to the catalog to the engine number AZJ it would be, but I have no information whether there is a module here. how is it with this model built in ??

Yes, the module is built-in, that's why the coil is called the module, even though it can be saved in the catalog as an ignition coil.

sulof1601 wrote:

Yes, the module is built-in, that's why the coil is called the module, even though it can be saved in the catalog as an ignition coil.

Thank you very much. Tomorrow evening, I will write how it went and whether it helped

The original is a TEMIC coil.
It does not have to be a coil, but can be HV cables.
Sprinkle the wires with water from the sprinkler without soaking the coil - it turns out.
I don't know about it, but in 2.0 AQY you have to disassemble the secondary air pump to get to the coil screws and remove it.
AZJ has a different intake manifold, so it may be different.

grala1 wrote:

The original is a TEMIC coil.
It does not have to be a coil, but can be HV cables.
Sprinkle the wires with water from the sprinkler without soaking the coil - it turns out.
I don't know about it, but in 2.0 AQY you have to disassemble the secondary air pump to get to the coil screws and remove it.
AZJ has a different intake manifold, so it may be different.

as I mentioned, the wires were replaced earlier. Today I replaced the coil, it turned out that it was slightly cracked underneath. I'm going on a longer route in a moment, it will turn out if it helped. The old coil was the original temic I founded the NGK company. The entire replacement operation took about 20-30 minutes

Added after 2 [hours] 39 [minutes]:

sulof1601 wrote:

Yes, the module is built-in, that's why the coil is called the module, even though it can be saved in the catalog as an ignition coil.

The coil was cracked you can see a clear improvement, the engine works much better and I do not jerk when accelerating. I will describe how it will behave on cooler days and in higher humidity, as soon as there is an opportunity. And I thank you with all my heart

Hello everyone, today it was quite humid and cool morning, the car was running smoothly, which is the obvious fault of the coil. Special thanks to sulof1601, I am very grateful to you for your expertise. With the wishes of one forum member, I will discuss the exact process of disassembling the old coil in my AJZ model. The first step is to disassemble the secondary air pump, as a colleague wrote above, it is not a complicated operation, but requires a little patience, especially with the engine screw, you need a small ratchet with a broken tip and on a stick, then disconnect the plug from the pump and move it to the side and a coil will appear to our eyes. I signed each HV cable and then dismantled it. The only thing left is to disassemble the coil itself, these are 3 torx screws (I don't remember which one) and our coil, after removing the coil, we have to remove the plug and install a new one