Mazda 6 running/starting problem

[drozer]

Dave,

now I have another problem..."Check Engine" from time to time lights. When it's ON, it stays on for day or two, then it gets OFF.

What kind of a problem this can be?

Thanks

[slidey]

Drozer, you'll need to get the codes read otherwise i'm just grasping at straws, it really could be anything.

Dave

[drozer]

Hi Dave,

I've been to mazda service and they told me that the problem was in the Protege Vacuum Switch Valve (96 Mazda Protege Vacuum Switch Valve VSV #K5T49091 KL015905 | eBay).
The problem that I had is that "Check Engine" lights from time to time.
In the mazda shop told me that this is not a big problem, and that this is a common error of this kind of models.

So, can you tell me, the real function of this valve, and how "big" is this problem?

Thanks,

[slidey]

Hi Drozer,i've never heard of such a switch! i've googled it and it seems to have something to do with the EGR valve, so i've looked in the workshop manual and there is a valve that controls the EGR (EGR solenoid valve).
Have you cleaned your EGR yet? if not i would try that.
The valve helps control emissions but can cause running problems if it gets blocked up.

Dave

[drozer]

I haven't clean the EGR valve yet. Also I have notice that when my car is in neutral speed, and I hit the accelator paddle, there is a little bit black smoke coming out from the EGR valve.
Definitively I'll clean the EGR valve ASAP.

Thanks ones again Dave...

[terryhanna]

I just want to say thanks to the forum for saving me a fortune! I have lived with the occasional stall, warm or cold, for perhaps a year. In the last month stalls became progressively more frequent, such that allowing revs to drop below even 1500 rpm would allow the engine to stall, after which re-starting was getting more difficult.
So ordered new Denso SCV from internet (£125), had it fitted (£10) - problem solved!