2002 mazda 626 2L 4 speed Performance Issues.

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Old 12-27-19, 03:14 PM
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2002 mazda 626 2L 4 speed Performance Issues.

2002 Mazda 626 2L 4 speed Winter Performance Issues.

Runs great in summer with no codes, no issues.

Last winter codes came on (p1516, p0303), car missed, ran rough, idled badly, sometimes stalling. The poor performance increased the colder the outside temp got. If left idling for a while the cel would blink.

Last spring codes disappeared and stayed off and car ran great

This winter when it got cold poor performance and codes came back (p1516, p0303). Car almost always starts on first try, in winter maybe second or third try. In cold weather, same conditions prevail even when the car engine temp warms.

I changed plugs. I think the coils are good (not many miles). Inspected air filter, PCV, coolant temp sensor, fluid levels and thermostat and all appear to look good or appeared to work properly. Inspected and cleaned MAF, it also appeared to be good. I think I have low compression in one cylinder, but still runs great and idles smoothly in summer. Codes now are P0303 and P0172. I suspected a bad coolant temp sensor, but after a cold start the high idling drops to normal rpm when it gets to operating temp, so I have ruled that out.

Can anyone provide any thoughts what the issues might be.
 
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Old 12-27-19, 04:53 PM
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Honestly, go post on Mazda forum, much better chance someone can help with specific issue!

https://www.mazdaforum.com/forum/
 
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Old 12-27-19, 05:06 PM
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Thank-you, I have. The 626 was produced similar to various other cars such as various ford models. Just thinking someone may have experienced this issue on this board.

Have a good new year
 
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Old 12-27-19, 08:46 PM
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best bet is a vacuum leak in the intake right at #3, if it goes away once car is warmed up.
 
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Old 12-27-19, 10:11 PM
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when it is cold outside it runs rough whether the engine is warm or not.
 
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Old 12-28-19, 08:02 AM
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What do the codes point to ?
 
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Old 12-28-19, 08:59 AM
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Remove and clean EGR and pipe that it sits on. I bet it's full of carbon build up. Have fun, that pipe is like mile long and not easy to remove.
 
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