First of all, I'm no expert. Most of what I know I've learned from searching these forums the last month trying to solve my problem.
I have a 2006 RX-8 manual transmission with just over 90k miles, no CEL or codes, oil changed last week and MAF sensor and throttle body have been cleaned. I changed the coils and spark plugs a couple weeks ago as the first attempt to fix the problem. It had been about 30k miles so they definitely needed to be changed, and the car did drive much better, but I'm still having issues.
I am typically seeing the issues after driving the car for about a half hour. My drive to work takes about 40 minutes, it is 38 miles and 36 of that is interstate. The car drives great getting on the interstate and while on the interstate, but as soon as I exit and slow down/idle the car runs rough. The idle is inconsistent and I completely lose power at low RPM's. At its worst the car will actually die at idle. The problem is worst when accessories are on, especially a/c. I have also noticed some flickering of the clock display and dimming of the headlights during the RPM fluctuation at idle. The fans also seem to turn on in sync with the idle revs.
I got on OBD-II scanner and all I've really noticed as being potentially strange so far is the battery voltage. The voltage is consistent around 13.5 during interstate driving but fluctuates from 11 to 14 at idle (see images). I replaced the battery early this year but broke one of the connectors in the process, I replaced both connectors but it's possible that in the process of tightening them I loosened another connection somewhere. I also wonder if the alternator might be going bad and not able to charge the battery enough during idle after a long drive.
I had the car to the dealership last week but they couldn't recreate the issue and said it "wasn't too bad". They said they could do a compression test as the next step, but obviously that is expensive and I don't even know if that will identify the problem.
I guess I'm wanting to know if there's anything else I should be looking for or anything else I can do to diagnose the problem. If I take the car in what should I have them look for? Any good mechanics in the Denver/North Colorado area?
Pics are a screenshot of OBD-II app showing battery voltage readings, the first on the interstate, the second after the drive at idle.
I have a 2006 RX-8 manual transmission with just over 90k miles, no CEL or codes, oil changed last week and MAF sensor and throttle body have been cleaned. I changed the coils and spark plugs a couple weeks ago as the first attempt to fix the problem. It had been about 30k miles so they definitely needed to be changed, and the car did drive much better, but I'm still having issues.
I am typically seeing the issues after driving the car for about a half hour. My drive to work takes about 40 minutes, it is 38 miles and 36 of that is interstate. The car drives great getting on the interstate and while on the interstate, but as soon as I exit and slow down/idle the car runs rough. The idle is inconsistent and I completely lose power at low RPM's. At its worst the car will actually die at idle. The problem is worst when accessories are on, especially a/c. I have also noticed some flickering of the clock display and dimming of the headlights during the RPM fluctuation at idle. The fans also seem to turn on in sync with the idle revs.
I got on OBD-II scanner and all I've really noticed as being potentially strange so far is the battery voltage. The voltage is consistent around 13.5 during interstate driving but fluctuates from 11 to 14 at idle (see images). I replaced the battery early this year but broke one of the connectors in the process, I replaced both connectors but it's possible that in the process of tightening them I loosened another connection somewhere. I also wonder if the alternator might be going bad and not able to charge the battery enough during idle after a long drive.
I had the car to the dealership last week but they couldn't recreate the issue and said it "wasn't too bad". They said they could do a compression test as the next step, but obviously that is expensive and I don't even know if that will identify the problem.
I guess I'm wanting to know if there's anything else I should be looking for or anything else I can do to diagnose the problem. If I take the car in what should I have them look for? Any good mechanics in the Denver/North Colorado area?
Pics are a screenshot of OBD-II app showing battery voltage readings, the first on the interstate, the second after the drive at idle.
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