Not quite a probe. 93 Mazda 626 V6. - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Probe Forum | Mazda MX6 Forum Forum for discussion of the Ford Probe and Mazda MX6.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 02-12-13, 09:22 PM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 5
Not quite a probe. 93 Mazda 626 V6.

Mazda forums are pretty inactive, it appears this isn't.
hopefully you can help me out a little bit. Since it's the same motor. Among other things I guess. I'll get to the point.
My sister has a 93 626 V6 auto. It wouldn't start the other day. Put a new fuel filter on, it was a cheap guess. Started right up. So I was warming it up, making sure it was OK. I went through the distributor issue already, and didn't want to tow it again.
I walked out of the garage while it was running. When I came back less than 5 minutes later, it was knocking. Checked oil, not low. It's coming from the rear cylinder head. Sounds like cylinder 5, but hard to say for sure.
Is there any common weak point up there? Just looking for ideas before I tear in to it.
Almost forgot, it's got about 165k miles on it.

Sent from my SPH-M820-BST using AutoGuide.Com Free App
zacschmuker is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 02-13-13, 04:46 AM
Moderators
 
R.S.LOGAN's Avatar
 
Join Date: Apr 2007
Location: Scotland
Posts: 13,935
Re: Not quite a probe. 93 Mazda 626 V6.

When you say " knocking " do you mean the big ends knocking or top end knock ?
R.S.LOGAN is offline  
post #3 of 10 (permalink) Old 02-13-13, 11:20 AM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 5
Re: Not quite a probe. 93 Mazda 626 V6.

It's not a rod knocking. I pulled plug wires one by one with no change. Not an injector. It's definitely top end though. Maybe you could call it a tapping type noise. It's a loud tap, or a quiet knock. Six of one, half dozen of another. I thought maybe, for example, valves bend. Or lifter problems are common. It's too cold here, so I won't be getting to it for a couple weeks. But if when I do get in there, there's something I should look for. It would be appreciated.

Sent from my SPH-M820-BST using AutoGuide.Com Free App
zacschmuker is offline  
post #4 of 10 (permalink) Old 02-13-13, 11:32 AM
Moderators
 
R.S.LOGAN's Avatar
 
Join Date: Apr 2007
Location: Scotland
Posts: 13,935
Re: Not quite a probe. 93 Mazda 626 V6.

May be a hydraulic tappet / lifter sticking .Could try an oil and filter change or an additive for clearing sticking tappets or both .
R.S.LOGAN is offline  
post #5 of 10 (permalink) Old 02-14-13, 09:52 PM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 5
Re: Not quite a probe. 93 Mazda 626 V6.

Going to try that. But I had a thought today. Are there any sort of baffles on the valve cover? I'm thinking, if there are, it may have come loose, and the cam lobe is hitting it.

Sent from my SPH-M820-BST using AutoGuide.Com Free App
zacschmuker is offline  
post #6 of 10 (permalink) Old 02-15-13, 09:42 PM
Dazed and Confused
 
CatSkinner's Avatar
 
Join Date: May 2012
Location: Upstate New York
Posts: 5,455
Re: Not quite a probe. 93 Mazda 626 V6.

Never seen baffles in them, but I've not seen them all.

Chewing on asphalt and drinking dinosaur wine
CatSkinner is offline  
post #7 of 10 (permalink) Old 02-16-13, 03:37 AM
Moderators
 
R.S.LOGAN's Avatar
 
Join Date: Apr 2007
Location: Scotland
Posts: 13,935
Re: Not quite a probe. 93 Mazda 626 V6.

As Cat says , most are just lids . But I'm sure some have other bits and bobs underneath , just cant remember which ones . Something like this for example ,

CIMG3367.jpg Photo by nevik78 | Photobucket
R.S.LOGAN is offline  
post #8 of 10 (permalink) Old 02-16-13, 02:24 PM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 5
Re: Not quite a probe. 93 Mazda 626 V6.

That's what I'm talking about. There's that extra plate on there. It appears to for the pcv valve in the pic. But does the rear one has something similar? Do you know?
Also, I just a compression test. I don't know if my gauge is correct, but I got 125-130psi on all 6 cylinders. So I don't think it's a valve issue.

Sent from my SPH-M820-BST using AutoGuide.Com Free App
zacschmuker is offline  
post #9 of 10 (permalink) Old 02-16-13, 04:52 PM
Moderators
 
R.S.LOGAN's Avatar
 
Join Date: Apr 2007
Location: Scotland
Posts: 13,935
Re: Not quite a probe. 93 Mazda 626 V6.

Psi's are all even , not bad for year and mileage , wont be a valve .Never known or heard of any plate on cam cover coming loose or causing knock .But there's always a first .If it's at the top end , I would think it's more likely to be a hydraulic tappet / lifter sticking .Remember and use a good synthetic oil if changing oil and fliter .
R.S.LOGAN is offline  
post #10 of 10 (permalink) Old 07-24-13, 08:29 PM Thread Starter
Registered User
 
Join Date: Feb 2013
Posts: 5
Re: Not quite a probe. 93 Mazda 626 V6.

Thread revival!
My knock is still there. I ended up taking the valve covers off to see what I could see. Found nothing, so I tried some Kreen. That hasn't helped at all. My diagnosis is a bad lifter or multiple bad lifters. At $27 each, I can't throw 12 at it and be done. Is there a way I can inspect them?
Another detail I forgot to mention, a heater coolant hose was blown. And the car was driven for about 5 miles. That was the start of it all.
Thanks for the help.

Sent from AutoGuide.com Free App
zacschmuker is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Probe Forum | Mazda MX6 Forum
Gear in this thread - Powered by O'Reilly Auto Parts


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome