Last post on Dec 25, 2010 at 8:12 PM
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Mazda MPV, Van
#2 of 68 Mazda error code 304
Jan 16, 2006 (4:33 pm)
We have a 2000 Mazda MPV with the check engine light continuously on. It first showed error codes 304 and 306. Our regular general mechanic first replaced the manifold, and then the coils, with no luck.
We then brought it to a dealership, and they told us that they believe that a valve is not sitting correctly on the 4th cylindar. (We now have only error code 304). Specifically, they say that the cylindar has low compression, and the exhaust valve is slightly burned out to cause a misfire. They need to remove a cylindar head and do a valve job. The cost will be approximately $3200. We have already paid $700 with no luck in fixing this error code. Any ideas?
#3 of 68 Re: Mazda error code 304 [currier]
Jan 17, 2006 (9:07 am)
Now that you know what the problem is, i would go back to the other mechanic and aks his advice and get a quote from him. You can buy and install a re-built engine for $3200. Otherwise, how does the MPV drive?
#4 of 68 Re: Mazda error code 304 [dtownfb]
Jan 17, 2006 (8:08 pm)
The van actually drives great. The dealership tells us that it eventually will start to have problems, and we risk damaging it even more if we do not address the check engine light. My concern is that the major repair which the dealership is proposing may not even be the problem. It would be a nightmare to pay the $3,200 and find that the check engine light probem does not go away. We did go back to the first mechanic, but he just lost his main worker, and is a bit distracted to handle this right now.
#5 of 68 Re: Mazda error code 304 [currier]
Jan 18, 2006 (10:58 am)
Do a Google search using "Mazda P0304" and see what comes up. I did this yesterday for my Intrigue that has a P0101 code. There were a bunch of websites that discussed this particular code and the steps to take. I bet you will find something similar for your situation. Not unless you want to spend $3200.
#6 of 68 Re: Mazda error code 304 [currier]
Jan 18, 2006 (5:07 pm)
We have the same car and similar problems, several error codes. Have replaced the exhaust manifold 2 yrs. ago, now in the last year have done a bunch of repairs for a nagging check engine light epedemic. To fix "lurching" during driving especially in the 40 - 45 mph range and some backfiring and sluggish starts from a stop - new Spark plugs, ignition coil, some other stuff and intake manifold, the latter got rid of the lurcing finally. But now the newest is a high pitched humming that gets higher the faster I drive. The tachometer is doing wierd things. I fear it is the transmission. We have spent about $1,000 in the last year to fix all ths stuff and at 105k miles I am not up for a new xmission. I am so disappointed with this car. Alternatives?
#7 of 68 Re: Mazda error code 304 [subeedoo]
Mar 10, 2006 (1:23 pm)
105K and you're disappointed??!!! I've put 4 transmissions in two windstars since 1996! Together with the transmission each vehicle came with, that's 6 transmissions in 9 years. They go out at 40K miles, then the replacement at 20K after that! 105K without a new transmission sounds like a miracle vehicle!! Whatever your alternative, stay away from ford.
#8 of 68 Also have Choking/Shuddering problem & STILL have shift shock!!
Jan 05, 2006 (9:19 am)
It's been over a year since I checked in, had the 2nd/3rd hard shift problem back in Oct '04, they fixed that but I now have had a 1st/2nd hard shift problem ever since. Dealer told me it was normal, bull****. I lived with it for a while and then I finally yelled enough about it and told our service manager that I have to drive this van for at least three more years until it's paid off per my husband so I can get my horse barn built! So, I want it FIXED!!! Anyone else have the 1st/2nd gear shift shock? It happens in bumper to bumper traffic a LOT when you accelerate from a stop, but before it shifts into 2nd you have to let up on the gas, then depress the gas again and then it hesitates and slams into 2nd. It drives me nuts! I guess since I'm in rush hour a lot I feel it a lot. Anywho, he said they may just replace our whole transmission this time. We'll see.
The choking/shuddering started at 37k miles, these cars have a built in timer to have problems right after the standard warranty is up I swear! Luckily we got a free 100k bumper-to-bumper warranty because of our original shift-shock problem, so it's covered. It's in the shop today, but our service advisor told me he already knew what it was, the ignition coil. I saw others posting about it so I though I'd chime in.
I'll post when I get my van back and let everyone know the ultimate resolution to both problems!
#9 of 68 Re: Also have Choking/Shuddering problem & STILL have shift shock!! [notasoccermom]
Jan 18, 2006 (12:30 pm)
I have a 04 (with 21k miles) and the gear change had always been very choppy/jerky. I had noticed the shifting became rough (sometimes the shock)going from 1st to 2nd, shortly after the TCM flash had been done on March 04. I had not noticed any 2nd to 3rd shift shock in the past year.
I got the the 1st/2nd gear shift shock on and off in the past 20 months. Mine sounds exactly like what you described. Sometimes, I thouhgt that I might have confused the transmission control. During a stop/slow and go situation when I accelerate, sometimes I get the shock if I have to let my foot off the gas(due to the traffic) before it shifts to the 2nd(around 3000 rpm). I seems like the transmission is programmed to expect me to depress the gas hard during acceleration everytime.
A few month ago, I unplugged the battery terminal for a reset and relearning of driving pattern. But now the jerky shifting is back during the slow and go. It shifts rougher if the O/D is off(o/d light on).
Interestingly, I drove a used 05 last July at the dealer and that tranny shifted smoothly and nicely. So I guess it is not normal to all MPVs
#10 of 68 Re: Also have Choking/Shuddering problem & STILL have shift shock!! [kinko]
Jan 18, 2006 (4:39 pm)
kinko go to your dealer and request TCM reflash if it wasn't performed yet, it should, but maby it wasn't
US BULLETIN No: 05-003/04 DATE: 05/2004
CAN BULLETIN No: N/A
APPLIES TO: 2003-2004 MPV AFFECTED VINs: JM3 LW28** 30 367822 - JM3 LW28** 40 518096
SUBJECT: Mazda Special Program (MSP03) - Shift Shock - Transmission Control Module (TCM) Reflash
2003 - 2004 MPV vehicles built from April 1, 2003 through January 26, 2004
2003 VIN Range: JM3LW28**30367822 - 378984
2004 VIN Range: JM3LW28**40500013 - 518096
The vehicle's automatic transaxle (ATX) may exhibit shift shock while the engine warms from cold to normal operating temperature. The symptom is intermittent, it does not occur all the time. The shift shock usually occurs during 1-2 or 2-3 upshifts, or 3-2 part throttle downshifts.
In most cases, the cause of the shift shock is from the TRANSMISSION CONTROL MODULE (TCM) software calibration. A new software calibration is available on ESI to correct the shifting concerns.
UNDER THE MAZDA SPECIAL PROGRAM (MSP03), ALL CURRENT DEALER INVENTORY AND RETAILED VEHICLES FOUND TO BE WITHIN THE ABOVE VIN RANGES, AND PRODUCED BETWEEN APR. 1, 2003 THROUGH JAN. 26, 2004, MUST BE INSPECTED AND REPAIRED ACCORDING TO THE INSTRUCTIONS CONTAINED IN THIS SERVICE BULLETIN.
BEFORE PERFORMING ANY REPAIR, VALIDATE THAT THE VEHICLE IS APPLICABLE TO THIS PROGRAM BY PERFORMING AN "eMDCS WARRANTY VEHICLE INQUIRY" AND VERIFYING THE VEHICLE DISPLAYS CAMPAIGN "MSP03". SEE "VEHICLE INSPECTION PROCEDURE" BELOW.
Inspect and repair all current dealer inventory according to the procedures contained in this service bulletin.
When a retail vehicle is brought into the dealer for any type of repair or scheduled maintenance, inspect and repair the vehicle according to the procedures contained in this service bulletin.
#11 of 68 Re: Also have Choking/Shuddering problem & STILL have shift shock!! [lazyfox]
Jan 20, 2006 (8:10 am)
I doubt that I could duplicate the symptom in realtime. Because it is intermittent, it does not occur all the time. The dealer told me time after time that they won't do anything 'til they see it happens.