zdanman 0 Posted August 20, 2019 Report Share Posted August 20, 2019 2002 Mazda 626 2.5L V6 Was throwing the P0400 CEL code (EGR code). Also had a lopping idle and ran rough and started rough. Replaced EGR valve with a brand new one. It fixed nothing. Exact same symptoms and issues. Any thoughts before junking this thing? @admins PLEASE DELETE THIS THREAD. New updated thread here... Quote Link to post Share on other sites
DanielM 0 Posted August 28, 2019 Report Share Posted August 28, 2019 On 8/20/2019 at 10:30 AM, zdanman said: 2002 Mazda 626 2.5L V6 Was throwing the P0400 CEL code (EGR code). Also had a lopping idle and ran rough and started rough. Replaced EGR valve with a brand new one. It fixed nothing. Exact same symptoms and issues. Any thoughts before junking this thing? I'd hate to see it junked over such a trivial issue. Just Saying. Quote Link to post Share on other sites
zdanman 0 Posted August 29, 2019 Author Report Share Posted August 29, 2019 Not really trivial. Took it to a mechanic... $200 later they said it was EGR valve. I dropped another $200 and replaced the EGR valve. No fix. Several times during use, had to crank the car for 2 whole minutes to get it to start. Pretty pathetic. Went from 30 mpg to 19 mpg. And on top of that no one on this forum after 9 days seems to have any idea what the issue could possibly be. Yeah id say its junk worthy. Quote Link to post Share on other sites
Kparr1612 0 Posted September 13, 2019 Report Share Posted September 13, 2019 Crank sensor faulty maybe.. ? What have you tried Quote Link to post Share on other sites
zdanman 0 Posted September 15, 2019 Author Report Share Posted September 15, 2019 On 9/13/2019 at 2:00 PM, Kparr1612 said: Crank sensor faulty maybe.. ? What have you tried Thanks for the suggestion... is this a hail mary .... or ? Quote Link to post Share on other sites
aleekat 48 Posted September 16, 2019 Report Share Posted September 16, 2019 Here's 12 pages of the same issues. Maybe you'll get some ideas. P0400 Quote Link to post Share on other sites
Kparr1612 0 Posted September 16, 2019 Report Share Posted September 16, 2019 You need to get a multimeter and test your spark from sensor to plugs buddy. It be a process but depends on if you wanna keep the car or not Quote Link to post Share on other sites
DanielM 0 Posted December 17, 2019 Report Share Posted December 17, 2019 My Mazda started with the P0400 code a few weeks after replacing the timing belt and water pump. Runs and Starts good enough to drive, but put your foot into the petal and the Check Engine light flashes indicating multiple misfires. Plugs, cables, Coil Pack, and Crank Sensor are new. I'm going to do aleekat's whole search list until I find the problem. My Mazda is no longer my daily driver, so I can focus on resolving it's issues without worry about getting to work. :-). Quote Link to post Share on other sites
mazda6sic6 0 Posted December 20, 2019 Report Share Posted December 20, 2019 map of maf, its what controls start up. the test is simple, disconect and start. if your idle is better theres the issue, also once running with it conected, dis connect. it should die out. this is in turn feed to the computer when put into gear and the AiC then controls the idle. its balnce with the EGR( mazda is unquie because its used to cool the temp down) and the purge canister. The vacume switches that control that all can be an issue. Quote Link to post Share on other sites
zdanman 0 Posted January 16, 2020 Author Report Share Posted January 16, 2020 @admins PLEASE DELETE THIS THREAD. New updated thread here... Quote Link to post Share on other sites
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