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S/V/C idle problem V70-T5

J

Janspeed

Active member
Joined
Sep 5, 2005
My 2001 V70-T5 has an annoying idle problem only when the engine is hot. the idle will surge between 600-900rpm. Bloody annoying, specially on a car with a slushbox.

here's the info:
- the engine runs good, no CEL, but VIDA does point out that the VVT solenoid is faulty.
- when cold it idles rock solid at 900rpm.
- VVT solenoid is new .
- When i disconnect it while the cold engine is running it will mess up idle making it surge between 600-900rpm. When i re-connect it the idle is rock solid again. my conclusion: the VVT solenoid works.
- When i disconnect it while the hot engine is running there is no difference in idle, it stays messed up surging between 600-900rpm. When i re-connect it there is no difference.
- when i measure the (green/grey and red/yellow) signal lines :
cold running @idle: 14V.
hot running @idle: 0.62V Should it be 14V hot as well??? wiring issue? ECM issue?
- it does not matter if the engine is in D or N or P, it is definitely a hot engine issue.
- could this be caused by a mechanical VVT sprocket issue? cam belt jumped 1 tooth?
- could this be caused by the weight of the engine oil? (VVT is oilpressure actuated)
- when the surging happens i switch the engine off Then i restart and immediately after the restart the idle is OK again. Only to get messed up again after a few miles of driving

I am at my wits end... Anybody have any pointers?
 
my brother and i did some checking. Wiring looked OK.
so we decided to check the engine control module (ECM)
I managed to pull it out but my brother noticed that there was a lose object inside the ECM box.
so we opened it up. Here is what we found (see red arrows):
http://sdrv.ms/QjKuuy
after re soldering of the diode the VVT was working again. Idle is OK as well.
 
Last edited:
Janspeed said:
my brother and i did some checking. Wiring looked OK.
so we decided to check the engine control module (ECM)
I managed to pull it out but my brother noticed that there was a lose object inside the ECM box.
so we opened it up. Here is what we found (see red arrows):
http://sdrv.ms/QjKuuy
after re soldering of the diode the VVT was working again. Idle is OK as well.
Click to expand...

Isn't it funny how one little thing like that can mess up a car?
 
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