MAIN VACUUM VALVE

2002 Toyota Corolla

Tiny

dave1310

August, 23, 2013 AT 10:22 AM

I have a 2002 Toyota corolla which idles very rough in reverse for about the first 5 mins when I first start the car, after that it runs/drives great. I have posted previously and I was told to possibly check for an engine vacuum leak, what does the main vacuum switch do and is this in combination with an EGR valve? Any other ideas? The CEL first came on after I cleaned the throttle body with TB cleaner.

I do have a CEL on, but like I said the drivability is very good.
The code is: PO300

FOUND 91 RELATED QUESTIONS

1 Answer

Tiny

hmac300

August, 23, 2013 AT 12:15 PM

P0300 is a misfire these are very hard to diagnose even for a pro and he should look at it. It can be a bunch of things causing that.

Please login or register to post a reply.

Vacuum Leak Test and Repair - All Cars