Mazda MPV This minivan was among the class leaders with its roomy interior and efficient powertrain.

04 mpv Rough idle please help!!

Old 11-29-2017, 04:30 PM
Junior Member
Thread Starter
Join Date: Nov 2017
Location: 76133
Posts: 2
Default 04 mpv Rough idle please help!!

Hey all,

just bought a 2004 mazda mpv. Bought it not running for 400. Main wire harness was chewed through by a mouse. So we replaced the harness. Had a very rough idle, so my husband and I installed new spark plugs and coils, made sure to gap the plugs. Air filter, oil change and oil filter, changed tranny fluid, new alternator (which was a nightmare BTW), amd mew battery. Still idles pretty rough. We're in the middle of repairing suspension parts too so I can't test drive it at the moment, but before we put up on jack stands it drove fine until it stopped at idle. Any suggestions of possibilities I can try for the idle?

has 240k miles.

p.s. passenger airbag off light is on. How do I turn that back on??

thank you in advance for any suggestions. I'll be sure to make a final post once the issue is fixed.
Old 11-29-2017, 10:29 PM
Junior Member
Thread Starter
Join Date: Nov 2017
Location: 76133
Posts: 2

No one replied with any suggestions, however, I still thought I would reply with the outcome just in case anyone else is looking for the same answer. I found a video of someone who used throttle body/carb cleaner, and sprayed in different areas around the intake manifold and egr valve to cjeck for leaks. If you have a leak, the engine will rev up in rpm for a few seconds, indicating a bad gasket. Ours revved up when we sprayed the gasket for the EGR Valve, so we bought the gasket (a whopping $3) and that solved our issue. No more rough idle!
Old 04-01-2018, 06:13 AM
Junior Member
Join Date: Apr 2018
Location: United States
Posts: 2
Default Rough idle

Glad you're driving the mpv 04 I have the same car and same similar issues a few years ago. Glad it didn't take you to long to figure out.
Related Topics
Thread Starter
Last Post
05-12-2019 11:53 AM
Mazda Millenia
02-06-2010 07:11 PM
Mazda MPV
08-06-2008 02:41 PM
Mazda MPV
10-24-2007 01:28 PM
Mazda MPV
10-06-2007 12:46 PM

Thread Tools
Search this Thread
Quick Reply: 04 mpv Rough idle please help!!

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 and affiliated sites.