Last post on Nov 16, 2013 at 8:34 AM
You are in the Mazda 626
What is this discussion about?
Mazda 626, Sedan
#1041 of 2547 1998 Mazda 626
May 07, 2002 (10:53 am)
My friend's factory alarm on his car went nuts yesterday, killing his engine and leaving him stranded. He actually had it deactivated over two years ago so he no longer has the key fob since it isn't supposed to work, so he couldnt turn it off that way. But then yesterday it went off when he tried to get into his car, killing the motor. The kill switch on the little driver's side kick panel didn't work so we could not disable it, and every time we opened any of the doors or turned the ignition or moved the shifter it went off again. We had it towed to the nearest dealership, where they said it would be 400 bucks to replace a wiring harness that was fried by the alarm. IT sounds fishy to me. I have trouble understanding how the alarm could hurt the harness, though I see how the harness could hurt the alarm. And all the other electricals in the car were and still are working fine. Any suggestions? I couldn't disconnect the battery since I had no tools, but Im wondering if that might set things right, or if perhaps it's a faulty alarm control module. Please let me know what you think, and any electronics or alarm experts please chime in.
#1042 of 2547 '91 626 Air Flow problems
May 08, 2002 (7:32 am)
Thanks, ALCAN! I took off the air hose, and sure enough, there was a 4" split right at one of the flex ribs! I couldn't see it the other night because it was toward the windshield. Just feeling back there didn't reveal it either, since it was at one of the ribbed areas. I used some duct tape to seal it temporarily until I can get down to a local parts store. Boy, it sure runs great, now! Thanks, again!
#1043 of 2547 purifyer
May 08, 2002 (9:00 am)
You're welcome. That's probably the first time duct tape has actually been used to repair a duct! LOL
#1044 of 2547 Changing oxygen sensors on V6
May 10, 2002 (3:31 pm)
Got a 93 V6 5sp with 142k miles.
CEL has been on and off since 90k miles and the code points to the sensors. I have been leaving them alone since emission and gas mileage are fine until recently when I noticed gas mileage drops a little bit.
Has anyone done this him/herself?
How difficult is it?
Found Bosch part for $55 each at Autozone.
Do I need a special tool to remove them? Thanks.
#1045 of 2547 CEL may not be O2 sensor (even with O2 sensor related codes...)
May 10, 2002 (5:00 pm)
If you want to change the sensors, go for it. It is easy, although my 626 (95, 4 cyl, ATX) has only the 'front' one (I beleive - windowphobe, correct me if I'm wrong...). For the front you need a a spanner that will fit, although I used an adjustable wrench (not recomended, though). Just buy the OEM Bosch part so you don't have to splice/solder cables (I also got it at AutoZone). The latching connector on it is kind of a pain to get loose. But it's doable. As for the back O2 sensor, I read that you have to put the car in stands to get to it. Nice page:
Go to the bottom and they have a section of O2 sensor replacement for the V6. One thing that I found useful: Do it when the engine is warm (not right after you drove because things down there get REALLY hot, but 1 hour later - The things are easier to unscrew).
Now, although you are getting a code related to O2 stuff (lean/rich mixture, etc., etc.), it may not be the O2 sensor. My mechanic got a code (finally!), and told me that the O2 sensor was the most likely culprit, so I changed it, and the CEL still flares up like a f#&$*ing Xmass tree. My next guess is the MAF sensor, for which I found a nice detailed cleaning procedure.
Hope this helps. Now I have to figure out why mine is still comming on, now more frequently, every time I step on the gas or the car is under load at ~ 2500 - 3000 rmp. I'm a research chemist by trainning, and refuse to pay an obscene ammount of money to have the dealer muck things up - I rather do that myself and feel proud about it!
May 10, 2002 (6:50 pm)
The first version of the FSD indeed uses only one oxygen sensor. (There appear to be two in the newer ones.)
#1047 of 2547 Thanks windowphobe - and question...
May 11, 2002 (5:11 am)
Thanks for confirming my information on the number of O2 sensors on the 95 4 cyl.
I still have a glimmer of hope - Do I need to disconnect the -ve battery cable to reset the computer and let it know it has a new O2 sensor?
#1048 of 2547 Is this the beginning of my CD4E problems?
May 11, 2002 (6:42 am)
While changing the O2 sensor yesterday and mucking with it this morning, I noted that there was a little wet spot around one of the seals on the tranny - Nothing major, I believe, just what you would expect of a 'cork'-type seal. Is this the beginning of the end? Is this something that can be corrected with a tranny service? If so, does anyone knows of an independent tranny service shop that speaks fluent 626/CD4E around Philly?
May 11, 2002 (1:55 pm)
Well, the saga continues. After I posted the last two messages (1033 & 1034), I went ahead and unplugged the battery while I mucked with the O2 sensor harness. I also tightened some of the bolts on the MAF that were kind'a loose.
After that, we went for a ~20 mile trip with highway speeds, lots of trafic and idling, I drove it hard, was under load up-hill several times, whicch were all conditions for the CEL to come on, and the CEL did not come on. Was I a happy man!
However, after all that, I get home, and the moment I turn into the dirveway, boing, the CEL flared up again!!! What the F&^# ?!?!
Why did the problem went and came back? Could the O2 sensor I got at Autozone suffered from 'sudden infant death', as many other electronic component are known to? I guess I'll do the MAF cleaning now...
As usual, any word of wisdom from all the 626 gurus in the board are welcomed.
#1050 of 2547 While you clean the MAF...
May 12, 2002 (7:33 am)
Check the air-intake tube. If there's a crack anywhere in the plastic, it can throw off the MAF readings, which in turn will bamboozle the computer.