whats your rpm at idle

[blkspeed]

few months back i got a cel on rich at idle and notice im always around 500-400 rpms it just dosent sound good we scanned the car and its not pointing out anything so we put denso plugs in and a dg induction cleaning and at first it kicked it up to 800rpm but next day shot back down. have no clue what to do now

 

[Racer45]

i would say it be your egr,,i would clean it or replace it,thats what people been telling me about the rough idle,,and check for cracks in your air intake house

 

[coyfish]

Stock idle rpm should be around 700 steadily once the engine is warm. If your car is idling at 500 im sure it feels like its going to stall . . .

What mods do you have. My guess would be a leak somewhere, MAF sensor problem, or EGR.

 

[blkspeed]

i have a mazda cai and put the air straightner in it but nothing fixed

should i get a short ram instead since the mazdaspeed cai is a fail?

sorry remind me what MAF and EGR

 

[coyfish]

EGR = ehaust gas recirc valve. Basically recircs your exhaust gasses to reduce harmful gasses from accumulating. Don't know THAT much about it but I know a malfunctioning one can cause a rough idle.

MAF = mass air flow sensor. Its the black thing that plugs into your CAI. Measures the air going in and adjusts your fuel / etc accordingly. If its dirty or malfunctioning it can cause your A/F ratios to go out of wack leading to problems.


I would check your hoses and clamps and make sure everything is nice and tight. Especially the vacuum / boost lines around your bypass valve. Then unscrew your MAF sensor and clean it off gently.

 

[blkspeed]

EGR = ehaust gas recirc valve. Basically recircs your exhaust gasses to reduce harmful gasses from accumulating. Don't know THAT much about it but I know a malfunctioning one can cause a rough idle.

MAF = mass air flow sensor. Its the black thing that plugs into your CAI. Measures the air going in and adjusts your fuel / etc accordingly. If its dirty or malfunctioning it can cause your A/F ratios to go out of wack leading to problems.


I would check your hoses and clamps and make sure everything is nice and tight. Especially the vacuum / boost lines around your bypass valve. Then unscrew your MAF sensor and clean it off gently.

whats should i clean the maf with? sound like that could be the case
plus the egr ill give it a shot.. thanks guys

 

[MikeHTally]

750 rpm.

 

[blkspeed]

i just found out the other day that my mech was putting 5w-20 in my engine do you guys think that could have helped the problem i mean its just at idle when its driving it runs like a horse

 

[MikeHTally]

i just found out the other day that my mech was putting 5w-20 in my engine do you guys think that could have helped the problem i mean its just at idle when its driving it runs like a horse

Certainly time to change mechanics. Find one who can read. Better yet, DIY. Clean the MAF with brake cleaner - VERY carefully. They're kinda tender.

 

[blkspeed]

Certainly time to change mechanics. Find one who can read. Better yet, DIY. Clean the MAF with brake cleaner - VERY carefully. They're kinda tender.

what about cnr maf cleaner? lol yea hes a friend but i notice people who arnt in to cars are like mazda 3 mazdaspeed 3 whats the diff? lol

 

[blkspeed]

maf is clean running at 700 wow spent money on new sparks and bg cleaning cause the computer scan didnt day any thing was wrong with the intake

 

[blkspeed]

back to the same s wth

 

[coyfish]

Could be the EGR. Why don't you take it to mazda?

 

[blkspeed]

dont have the money right now unless it would cover the 60,000 powertrain warranty

 

[mr_mazda329]

dont have the money right now unless it would cover the 60,000 powertrain warranty

I am pretty sure EGR isnt covered under the 60k warranty. It sucks that its not. Considered a part of Emissions Control