Mazda Protege This compact model offers an economical solution for the need for a sporty sedan or wagon.

2003 Protege DX 5MT rough idle

  #1  
Old 10-31-2018, 08:44 AM
Junior Member
Thread Starter
Join Date: Oct 2018
Location: CO
Posts: 6
Default 2003 Protege DX 5MT rough idle

Hi! This is my first post on this forum.

I just bought a 2003 Mazda Protege DX Manual transmission 170k miles and have been having issues with rough idle. At emissions it threw a p0303 CEL light for cylinder 3 misfire.

I noticed a small pool of oil near the #3 spark plug boot, took boot out, fair amount of oil on it as well as oil on #1 cylinder boot. #3 spark plug looked the worst of all 4. Replaced valve cover gasket along with dabs of RTV by sharp corners near cams, spark plugs (NGK V-power), and I removed EGR valve for a good clean (soaked an hour in carb cleaner, oiled valve shaft, replaced). Also cleaned out PCV valve as well. Computer has been reset several times, always disconnect the neg battery cable before working on cars,

The car still gives me rough idle after being warmed up, it actually almost stalled for the first time today after EGR clean.

I have searched on this forum for rough idle threads, EGR clean, etc etc. I was just wondering if there is anything else I should try before I buy new coil packs and wires?

TIA,
Thomas
 
  #2  
Old 11-02-2018, 07:23 PM
Junior Member
Thread Starter
Join Date: Oct 2018
Location: CO
Posts: 6
Default

I replaced coils and wires it helped a little anyone have any ideas? Thanks
 
  #3  
Old 11-02-2018, 09:10 PM
Super Moderator
Join Date: May 2012
Location: Queensland Australia
Posts: 3,463
Default

With the engine running, spray brake cleaner all around the intake manifold, listen for any change in engine tone, this would indicate a vacuum leak.
 
  #4  
Old 11-04-2018, 05:35 AM
Junior Member
Thread Starter
Join Date: Oct 2018
Location: CO
Posts: 6
Default

UPDATE::

I sprayed TB cleaner around IM - no apparent leaks / idle did not raise. Thanks grim_reaper for the suggestion. I did however peek at the air filter for the first time - and it looked like a dryer filter that hadn't been cleaned in two weeks! I replaced the Fram filter with a Purolator, and the idle / hesistation problems were nearly absent.

I couldn't get the screws on the IAC valve off to clean it ( 1 hour, 3 coats of PB blaster, using #2 phillips head and hitting screw driver with hammer while turning). You REALLY need an impact wrench for this. However I did get into the TB and spray a good amount of Choke / Carb cleaner. I bent the little red straw so the fluid would hit the top of the inside of the TB where the IAC valve is.

However, last night while driving i got P0507 "Idle Control System RPM Higher Than Expected" code. I must have loosened something up by spraying the inside top of the TB, or it could be the new air filter. My car has been sitting overnight with negative battery cable off, and I will update as this progresses.

P0507 MAZDA - Idle Control System RPM Higher Than Expected

Read more: https://www.autocodes.com/p0507_mazda.htmlP0507 MAZDA - Idle Control System RPM Higher Than Expected
 

Last edited by 02barurs; 11-04-2018 at 06:16 AM.
  #5  
Old 11-07-2018, 05:43 AM
Junior Member
Thread Starter
Join Date: Oct 2018
Location: CO
Posts: 6
Default

The car is idling better now. I am replacing the IAC when the parts come in.

After researching, I found out the screws that mount the IAC are Japanese Industry Standard (JIS #2) and a normal US #2 Phillips driver head will strip them out. Easily ordered online as Lowe’s and Auto parts store did not have any.

I am glad I stopped trying to get the screws off and look it up online before I totally stripped them out. Perhaps the screws that mount the solenoid to the EGR are JIS as well.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Doggyx
Mazda6
10
05-12-2019 11:53 AM
blameitonfinland
General Tech
2
06-20-2010 09:31 PM
j_r_42
Mazda MPV
0
08-06-2008 02:41 PM
thomasmax
Mazda MPV
1
10-06-2007 12:46 PM
knighthood
Mazda Protege
1
02-19-2007 05:20 PM


Thread Tools
Search this Thread
Quick Reply: 2003 Protege DX 5MT rough idle


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.