Idle drop when in neutral slowing down

  • 2002 OPEL CORSA
  • 1.4L
  • 2WD
  • 306 MILES
Hi guys, vehicle listed above Bakkie Corsa lite shape. When in neutral or clutch in when slowing down the idle drops to 0 and then cuts off. Changed. Crankshaft sensor, coil pack, idle valve, cleaned throttle body and done service. Problem still happens intermittently.
Do you
have the same problem?
Saturday, November 20th, 2021 AT 9:46 PM

1 Reply


First, we don't offer this vehicle in the US, but I will do my best to help.

It seems a lot has already been replaced. When a vehicle has an idle issue, there are a few things I think of. First, the IAC which you replaced or the throttle body needing cleaned which you have done.

So, after that, I normally would take a live data scan tool to analyze the short-term fuel trims. If they are lean, I would be checking for an engine vacuum leak. If they are rich, I would first check the fuel pressure to make sure the regulator hasn't failed. Then a leak down test on the injectors to see if one or more is leaking causing the rich mixture.

If you haven't already, check for vacuum leaks. Here is a link that explains how to do it:

If none are found and you have a scan tool with live data, let me know what the short-term fuel trims are at operating temperature and hopefully (LOL) idle or as close as you can get.

If that isn't possible, check the fuel pressure to see if it is too high or indicated a leak when you turn the engine off. Here is a link that explains how that is done:

Let me know if this helps. Also, let me know if there are any odd odors from the exhaust, smoke, or anything you can think of that may help me identify a possible cause.

Take care.


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Sunday, November 21st, 2021 AT 6:24 PM

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