Idal and flat spot in excellerstion

[Gunny112]

I have a 2002 180bhp audi tt coupe I have two problems if any of you people can help me please??
1. when starting up in the morning I get a weering sound for a short while then it seems to go but the idel speed drops every now and then as if it going to cut out (but doesnt).

2. some times I put my foot down to increase speed and there seems to no exceleration then all of a sudden it will pick up.

I have but it on the prognoses machine and it said it was TOO RICH BAND 1?

I have changed all four coil packs and all four spark plugs though i didnt gage the spark plugs as they were the new ones with the four prongs on the bottom. I have also removed the Mass Airflow Sensor and cleaned it with the spray and let it dry before replacing it. If you could solve the problems or point me in the right direction it would be great

[Adrian E]

Possibly lambda probes but needs a proper diagnosis really

[Dr G]

Adrian E said:

...needs a proper diagnosis really

Anything else is just guess work. A proper diagnosis will be cheaper than getting it wrong 3 times then fixing it by luck.

1.8Ts are prone to a fair few sensor/electrical issues that can cause poor running.

[Gunny112]

Thank you guys I will get a proper test done and hopefully it will sort the prolem for me.

[BIGYIN1314]

Just a thought, do you know if it has the standard Recirc valve fitted or if there is an aftermarket dump valve fitted? The only reason I ask is that if you had a 'Vent to atmoshphere' Dump Valve fitted, it could produce a poor idle and affect the revving nature of the engine (which i suppose could produce a flat spot)

[Gunny112]

Thanks BIGYIN1314 but i would have a clue about the 'Vent to atmoshphere' Dump Valve is there anywayof checking ???

[SuperchargedVR6]

Does it go "Pshhhhhht" when you lift off the accelerator when driving? If no, you have the standard recirc valve.

4 prong spark plugs you say. They are not the right ones for the engine and I'm guessing they're bosch plugs? Replace them with the correct single electrode NGK plugs from the dealer.

[Gunny112]

is that the name of the valve im looking for "Recirc valve"? or ERC Valve?
I will change the spark plugs back to NGK ones I hate it when they give you a bum steer in the auto shop just for a sale Grrrrrrrrrr

[Gunny112]

where do i find this valve to replace it please kind people

[Andy OH]

Sorry to be blunt but take the car to a garage and get a proper diagnosis. This is really the only answer as you are guessing as to what is wrong with the car and in the long run it will probably save you money.