blackc30probs Posted June 21, 2018 Report Share Posted June 21, 2018 2008 Volvo C30 1.0 T5 with 130k miles. On cold startup the car runs rough bouncing between 1500-2000 rpm for about 10 sec before returning to 1500 until it is warm, the following codes have appeared: P0101 MAF circuit range/performance, and P0300 Random/ Multiple cylinder misfire. I have taken the following steps to solve the issue: About a year ago Cylinder 3 coil pack was replaced due to P303 code (issue was solved, just added as background) New MAF sensor was installed (after attempting to clean the stock Bosch unit, which also didn’t stop the code from reappearing) 2 weeks ago All 5 spark plugs replaced with Bosch units (3 months ago) New air filter, which was installed at the same time as the spark plugs The MAF problem started about a month ago, but the rough idle only 2 weeks ago, even after clearing the codes, they return after 1 or 2 driving cycles. Rough start up even happens after codes are cleared. Anybody had this issue, or have any advice as to what the next steps should be? Link to comment Share on other sites More sharing options...
blackc30probs Posted June 22, 2018 Author Report Share Posted June 22, 2018 Update: I was unable to remove the throttle body to clean it out, it is in such an awkward position and so tightly packed I could not get to all of the bolts. I check the plugs, still look clean. checked for vacuum leaks, and found nothing. As I was on my way to work the car started misfiring badly on all cylinders, like unable to maintain rpm and was stuttering and bucking. I will be taking it to my mechanic because I don't have time to work on it, nor can I make it home safely. Link to comment Share on other sites More sharing options...
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