Posted to Technical Tips Forum on 1/6/2015
Mazda timing and Cam related codes
The above vehicle came from a quick lube shop . The oil
filter housing cracked and it leaked out 3 quarts of oil.
After it was fixed it had a terrible surge and a P0340 code.
The code can be deceiving as with many manufactures its more
of a correlation code in this case.
I looked at the waveform and cleared the code only to have
symptom and code quickly return.
I found a known good waveform and knew what the next step
was. To do this job properly you are removing the front
cover. Or you can make this hack tool and whip in about an
You take this SK 6 point wrench part # 88365 and have it
milled to 3.7 mm and weld a nut to it that allows you to
attach a socket.
There is a tool that screws in the back of the block for TDC
that I have but the axle will have to come out. I usually
use a vacuum gauge and a screw driver to find TDC #1. I will
then steal a bolt form the timing cover and screw in through
the balancer and into the cover like so.
Mazda TDC with bolt stolen from cover
With piston on TDC and the valve cover removed you can see
the intake cam off.
You loosen the Intake cam bolt with special wrench and the
exhaust with a crows-foot wrench. You then use a wrench ,
sorry don't remember the size 1 1/8 inch maybe and rotate
the cam until the flat stock bar lines up the cam slots in
the back of the cam.
Here is the intake cam sprocket being torqued to spec ,
actually a few ft lbs more due to the leverage of the
butchered wrench =)
Here is the exhaust cam sprocket being torqued with the
crows foot wrench.
When that is done the vehicle is started , surge is gone,
code is gone, and the waveform looks good.
Not to derail this too much but a very similar thing can
easily be done when someone does a front seal and gets
timing off by rotating cams to allow the crank to be moved.
That is a whole other story.
I know this isn't the right way to do this but it does work
and has a place in your arsenal. This case the oil change
place tried to bail , the car was rough, customer was pissed
, and in 1 hour its business as usually.
To date I have done 4 of these with one being on the road
22k miles and its still fine.
They say the chain stretches when run low on oil I believe
the cam gets tight in the head and moves. I'm probably wrong
as usual all I know is this keeps the vehicle, customer, and
mostly me happy =)
PS this tool only works on the 2 wire cam and crank sensors.
The 3 wire hall effect sensors have an 18mm bolt and I have
yet to make that tool .
Mike from Ohio
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24 Replies Received