My 2002 millenia, has rough idle, periodic surging/bucking, and slight engine knock below 2000 RPMs?? dealer has no clue and it cost 2 Gs to find that out... need help plz

135

Asked by Oct 19, 2010 at 06:56 PM about the 2002 Mazda Millenia

Question type: Maintenance & Repair

4 Answers

45

It could be anything from a gunked up intake to a bad valve/ loss of compression. I would suggest taking it to a race/ performance shop and have it looked at again, it has been my experience that those shops tend to take much more pride in their work.

2 of 2 people found this helpful.
15

time to remove your intake, throttle body, fuel rail and valve covers. clean mating surfaces and replace all gaskets. then pour 1/3 of a can of seafoam into your oil and remove the vacuum hose from your intake or brake booster and let the car suck up the rest of the can SLOWLY. let the car stall out and wait 15-20 mins. start the car in a well ventilated area, let the smoke burn off. do not rev the engine. i did this all with a friend in 4 hours

1 of 1 people found this helpful.
20

I'm not a mechanic, but I have the same symptoms on my 1997 S. I've narrowed this down to a vacuum leak or a solenoid, regulating fuel mixture. There are three and maybe four solenoids behind the manifold. I've told you 130% of what I know about this. Good luck.

2 of 2 people found this helpful.
20

It could be bad valves. Mazdas were equipped with hydraulic valves that have to be replaced when one goes bad. Usually start with a slight knock that will progress to get louder, a rougher idle, and eventually the engine will lose compression until it shuts off on its own when idling. My friend had this problem with his MX6 4 cyl. It cost him $20 per valve plus labor. Ended up paying close to $700 to repair it. If you have a V6, lets estimate 24 valves multiplied by $20 is about $480 plus labor for Hydraulic valves. While you are there, might as well replace Timing belt, water pump, and tensioners....you don't want to go back and do regular maintenance in the future. Needless to say I sold my MX6 V6 because I didn't want to spend that much....I missed it. Now I came up on a Millenia that has a rough Idle too, I will end up selling it because I don't want to spend that much on a car. I'm already going to solve the shaking problem by replacing the CV's (car shakes when accelerating) and Radiator hoses. All of the above was recommended by Mazda Dealer. Otherwise, it is a handsome car and would keep it if i wasn't such a scaredy cat. If it is really clean, fix it and keep it.

2 of 2 people found this helpful.

Your Answer

Add photo

Related Questions

Millenia

Looking for a Used Millenia in your area?

CarGurus has 69 nationwide Millenia listings and the tools to find you a great deal.

ZIP:

Search Mazda Millenia Questions

Mazda Millenia Experts

#1 Steven Cisneros
Steven Cisneros
Reputation 730
#2 Keith12345
Keith12345
Reputation 420
#3 Tom Demyan
Tom Demyan
Reputation 230
View All

Related Models For Sale

Used Nissan Maxima
351 Great Deals out of 24,203 listings starting at $1,800
Used Acura TL
196 Great Deals out of 5,332 listings starting at $999
Used Honda Accord
1,079 Great Deals out of 66,787 listings starting at $1,000
Used Toyota Corolla
970 Great Deals out of 69,188 listings starting at $1,800
Used Mazda MAZDA6
186 Great Deals out of 14,583 listings starting at $1,395
Used Mazda Protege
224 listings
Used Chevrolet Malibu
1,147 Great Deals out of 80,895 listings starting at $2,500
Used Mazda MX-5 Miata
80 Great Deals out of 3,991 listings starting at $1,800
Used Mazda 626
203 listings
Used Chevrolet Camaro
366 Great Deals out of 31,402 listings starting at $2,400
Used Nissan Altima
1,271 Great Deals out of 74,941 listings starting at $1,800
Used Acura CL
3 Great Deals out of 187 listings starting at $1,900
Used Toyota Camry
1,245 Great Deals out of 82,706 listings starting at $750

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.