a12 rich and lean cylinders

all your DIY needs
Post Reply
72datsun
Newbie
Posts: 2
Joined: Tue Mar 17, 2015 6:23 am
Location: hamilton
Contact:

a12 rich and lean cylinders

Post by 72datsun »

Hi everyone

I just removed and engine out of my 1200 to do oil seal. When i pulled the spark plus out i noticed cylinders 1 and 4 are rich and cylinders 2 and 3 are lean. Its a completely standard engine. Standard carb and manafold etc. Any suggestions on what it could be?
User avatar
classicdat
Committee Members
Posts: 3259
Joined: Wed Apr 21, 2010 9:59 pm
aka: Vaughan
Location: Datsun Central, Christchurch
Contact:

Re: a12 rich and lean cylinders

Post by classicdat »

How could you tell?
What condition are your leads?
May not be lean and rich, may be weak spark??
How often does your car get to run hot, without the choke, and get a good blow out?
What was the motor doing just before it was pulled out, what was it's last run?
Datsuns from A to Zed
Bartman
Committee Members
Posts: 7303
Joined: Sat Jul 19, 2008 9:04 am
Location: Datsun City
Location: Christchurch New Zealand!!!!
Contact:

Re: a12 rich and lean cylinders

Post by Bartman »

Moved to correct forum.
They don't call me the man with the rubber arm for nothing you know.............
72datsun
Newbie
Posts: 2
Joined: Tue Mar 17, 2015 6:23 am
Location: hamilton
Contact:

Re: a12 rich and lean cylinders

Post by 72datsun »

no 1 and 4 plugs are black and no 2 and 3 plugs are clean
i just got car out of storage 3 or 4 months back. put all new plugs points condenser leads.
It gets a good hot run once every 2 weeks. gets driven at least 2 or 3 time to work a week. work is'nt far away about 5 or 10 min drive. i let it warm up before i go
engine was running very well. never missed a beat. the last run was to work
Post Reply