Yea, it's a big list but I think it goes in order of the most likely cause....
But that was for when the car was new. Searching for a vacuum leak should be way up near the top now with our rotting plastic and rubber parts...
Yet ANOTHER rough idle - 2002 P5
- Thread starter sslavik
- Start date
Yea, it's a big list but I think it goes in order of the most likely cause....
But that was for when the car was new. Searching for a vacuum leak should be way up near the top now with our rotting plastic and rubber parts...
OmgitsKinny
Member
- :
- 2003 Mazda protege 5
I got an 03 p5 and been dealing with the same s*** for like two years. Did cats, O2 sensors, spark plugs and cables and coils like 5 times, IAC, cleaned out EGR, many gas treatments, and taken it to various mechanics for different opinions. Still dealing with this issue.
OmgitsKinny
Member
- :
- 2003 Mazda protege 5
I feel the same way tho! If I didn't love this car so much lol
The recap and conclusion....
Idles smooth on startup, starts getting erratic "bumps" after a few minutes.
A/C and power steering affect it, but unpredictably.
When driving, it stumbles off idle but runs smooth above ~1500rpm.
No check engine lights (except a rare "random engine misfire" when it stutters bad enough to die)
Replaced coils, plugs, boots, no change.
Cleaned and tested EGR, IAC, MAF, no change.
Spent hours looking for vacuum leaks, bought vacuum gauge, not a vacuum problem.
Reset ECU, no change.
Verified no defects in air intake.
Sea foamed the hell out of the intake, can through gas tank, no change.
Getting desperate....
Replaced MAF, no change.
Replaced Fuel pump (complete assembly), no change.
Finally took it to the shop, ugh.
Drum roll.....one of the new coils was bad, son of a b_tch! When I replaced them, I replaced them one at a time, hoping I'd find the bad one (if there even was one). The mechanic told me that mixing a good and bad one could actually mess up a good one. Sounds nuts to me, but hey, he found and fixed it, he's my hero. P5 back in business!!!! I love this car!!!!
Idles smooth on startup, starts getting erratic "bumps" after a few minutes.
A/C and power steering affect it, but unpredictably.
When driving, it stumbles off idle but runs smooth above ~1500rpm.
No check engine lights (except a rare "random engine misfire" when it stutters bad enough to die)
Replaced coils, plugs, boots, no change.
Cleaned and tested EGR, IAC, MAF, no change.
Spent hours looking for vacuum leaks, bought vacuum gauge, not a vacuum problem.
Reset ECU, no change.
Verified no defects in air intake.
Sea foamed the hell out of the intake, can through gas tank, no change.
Getting desperate....
Replaced MAF, no change.
Replaced Fuel pump (complete assembly), no change.
Finally took it to the shop, ugh.
Drum roll.....one of the new coils was bad, son of a b_tch! When I replaced them, I replaced them one at a time, hoping I'd find the bad one (if there even was one). The mechanic told me that mixing a good and bad one could actually mess up a good one. Sounds nuts to me, but hey, he found and fixed it, he's my hero. P5 back in business!!!! I love this car!!!!
- :
- 06 Mazda 3 Hatchback GT
I am starting to think road trips with an extra set of coils in the car isn't a horrible idea.
I have one stuffed in the jack cubby.
Stash a 10mm wrench in there too so you can change it.
