2006 Mazda 3 2.0

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2 months 3 weeks ago #201274 by wlin1011
2006 Mazda 3 2.0 was created by wlin1011
Hi, I just bought a 2006 Mazda 3 i 2.0 engine, the seller said car's been sitting there for about 4 months, so he put in a new battery. new catalytic converter installed, I test drove it, it's rough at lower rpm, engine shakes random between 1000-2000 rpm. shakes every 3-5 secs when idle. once pass 2000rpm car is smooth. I used OBDii scanner, no code. I'm trying to get it smog, it was failed due to IM not ready. I changed the oil and filter, replaced spark plug, and checked the coil it's all functional, I check the scanner, Long term fuel trim is normal up and down between 1-5%, but short term fuel trim will jump 0-30%. Please help what could be the cause. bad O2 sensor? or vacuum leak?

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2 months 3 weeks ago #201280 by hondaguy453
Replied by hondaguy453 on topic 2006 Mazda 3 2.0
How many miles have you driven the vehicle since the battery has been replaced? I ask this because when the battery is replaced, all of the ECU's memory is erased. Which means all the data that was used for fuel trim, ignition timing, and all other parameters have to be relearned. This could be why you're getting the vibration at idle. 10-20 miles should reset the computer, for the vibration at least. Maybe 100 miles for all the emissions monitors to pass.

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2 months 3 weeks ago #201286 by wlin1011
Replied by wlin1011 on topic 2006 Mazda 3 2.0
Hi, thank you for replying, car has 126,000 miles on it. it's rough at idle, but I've been driving over 300 miles now. can't get I/M ready. If ECU is relearning it should be okay by now. I'm thinking could be a bad o2 sensor, it may affect idle too? Thanks!

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2 months 3 weeks ago #201299 by relative4
Replied by relative4 on topic 2006 Mazda 3 2.0
Bad O2 sensor, bad MAF sensor, or vacuum leak can do that. You can smoke test for vacuum leaks, and monitor/log MAF & O2 voltages. Posting a log here may help.

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