Well, the dreaded stalling bug has hit me, sadly.
The car is very well maintained and worked beautifully. Now it won't tick over, it just stalls.
Otherwise it's running perfectly fine, smooth, no power loss, etc.
Since I couldn't find anything wrong with the vacuum pipes, especially the one to the MAP sensor, I changed the Stepper Motor/Idle Air Control Valve. This actually cured the problem for an afternoon, now the issue is back.
Here is what has been done so far:
- Thoroughly diagnosed vacuum pipes
- Took Throttle body out and cleaned it thoroughly
- Replaced Stepper Motor/IAV
- Disconnected the battery while waiting for the spare, i.e. several days, which should have reset everything
I admit that the stepper motor I ordered was the cheapest one and it has no manufacturer markings.
I know it is not uncommon for this Chinese rubbish to fail instantly.
But before I condemn an entire people, is there a way to actually test those for functionality?
Does anyone by any chance know what else I could check that might be a possible culprit?