P0400 - Rough Idle - Brand New EGR

[zdanman 0]

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?

[DanielM 0]

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. 

[zdanman 0]

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.

[Kparr1612 0]

Crank sensor faulty maybe.. ? What have you tried

[zdanman 0]

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 ?

[aleekat 48]

Here's 12 pages of the same issues.  Maybe you'll get some ideas.

P0400

[Kparr1612 0]

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