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12-27-2015, 09:55 PM | #1 |
Drives: 2010 3dr Join Date: Mar 2014
Location: United States
Posts: 3
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Intermittent rough idle and stall
I've have creeped here for the longest time and this forum has been the biggest help but now I have a strange question for y'all.
Intermittently my 2010 yaris has had slightly rough idle, just enough to make the driver uncomfortable. I haven't had much problem out of it until now. I have 106000 miles on it. I just replaced the serpitiene belt ( badily cracked and made a squeek when colt), and the problem got much much worse. Today I also replaced all spark plugs with Toyota spec spark plugs. This made no difference. I have also tested all 4 coil packs to no avail, they all appear to be working because when I pull any one of them it engine almost stalls. I also checked the maf sensor and it is clean. I did a long time ago install an aftermarket cold air intake system. It is not throwing any codes, even checked with obd2. The trouble is intermittent when idling. The more load on the motor the worse it is, turn ac on it gets worse, put transmission in r, or d and worse. If I turn off the ac or put transmission in neutral the idle is still rough but not is bad. If I give the engine a little gas it will fix it . if I am driving it runs perfectly. I have never heard anything weird or had any smoke. The motor and transmission mounts are good. When I am driving and come to a stop for a light or stop sign is mostly when it will occur but not always. It does not matter if engine is hot or cold. Transmission fluid is full, raditior is full. Oil is synthetic. Battery was replaced one hear ago for typical battery going dead in winter symptoms. I have also replaced the alternator due to constant screeching about a year ago. Sent from my SAMSUNG-SM-G920AZ using Tapatalk Last edited by slipaway172; 12-27-2015 at 10:06 PM. |
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