Hi, sorry to bother you all for the third time with the same problem! I'm still having issues with my 1.6 petrol (engine code ALZ I'm pretty sure - coil pack instead of coil in plug cap).
My original post below suggested several things and I'm trying to work through them. I replaced the coolant temp sensor and am looking at the MAF sensor now. As it's a lot more expensive I'd rather be sure it's gone before replacing it.
It's a 4 pin type, and I got the following resistance readings (unplugged & pin numbers as written on the plug/harness) :
So, it would appear that pin 3 is not connected to anything. There are 4 wires going into the plug. If the MAF just has simple resistance wires, then I found a problem, however, if there is electronics in it, these could be valid values in an inactive state. I understand there are 3 types of MAF, simple resistance, slow frequency out and high frequency out. The latter two must have electronics in them?
To experiment, I unplugged the connection the last few days, and the car is starting on the button now! It did throw a P0102 and PP0113 though. So, with the MAF connected, no errors and bad starting, disconnected, errors and good starting and running!
This post details the CTS replacement and has a video of the car trying to start, plus a pic of the engine (to confirm code)
Many thanks,
Kevin
My original post below suggested several things and I'm trying to work through them. I replaced the coolant temp sensor and am looking at the MAF sensor now. As it's a lot more expensive I'd rather be sure it's gone before replacing it.
1.6 petrol - bad starting, huge flatspot, no error codes
Hi, my '02 1.6 petrol B6, just under 100,000 miles, has become very hard to start from cold. I turn the key and it fires and then dies. Have to do this about 4 times before it starts, then it hunts around 500-1,500 RPM for a few seconds before going to a smooth idle. If I let it run for about 1...
www.audi-sport.net
It's a 4 pin type, and I got the following resistance readings (unplugged & pin numbers as written on the plug/harness) :
- 1,2 - 3.7 K ohm
- 1,3 - open circuit
- 1,4 - 6.3 K ohm
- 2,3 - open circuit
- 2,4 - 2.6 K ohm
- 3,4 - open circuit
So, it would appear that pin 3 is not connected to anything. There are 4 wires going into the plug. If the MAF just has simple resistance wires, then I found a problem, however, if there is electronics in it, these could be valid values in an inactive state. I understand there are 3 types of MAF, simple resistance, slow frequency out and high frequency out. The latter two must have electronics in them?
To experiment, I unplugged the connection the last few days, and the car is starting on the button now! It did throw a P0102 and PP0113 though. So, with the MAF connected, no errors and bad starting, disconnected, errors and good starting and running!
This post details the CTS replacement and has a video of the car trying to start, plus a pic of the engine (to confirm code)
1.6 petrol - bad cold starting; where is the coolant temp sensor & testing it?
Hi, back in Feb I had a starting and flat spot issue that resolved itself. I posted in the link below and got many helpful replies. Well, my bad starting is back again. https://www.audi-sport.net/xf/threads/1-6-petrol-bad-starting-huge-flatspot-no-error-codes.423783/ The car overheated a few...
www.audi-sport.net
Many thanks,
Kevin