Question about 1997 Mitsubishi 3000GT
Feels like ignition retarded..
Tried airflow sensor and throttle cable also checked exhaust.
My bet is on bad plugs or bad wires, how old are they? if more than 50k on iridiums, or 15-20k on coppers. Replace them with NGKs... autozone will try to tell you that other brands are the same, but they are NOT.
The front three are easy to get to, if you want to verify if this is your problem, pull one of the front three plugs, you should be able to tell their condition by looking, and if you replace the front three, you may even see a small increase in power... if you do, then you will know you need to do the rears... they are a bit harder.
If you go to a mechanic, they will want 300+ to change your plugs because the rears are so much more difficult because you have to take off the upper plenum to do it...
It is actually something that is pretty easy for a shade-tree mechanic to do, just be very careful once you pull off the plenum to NOT drop anything down into your cylinders... ESPECIALLY THE WASHERS FROM THE NUTS ON THE ENDS OF THE UPPER PLENUM! When you take off the 5 bolts, and the two nuts, MAKE SURE YOU HAVE ALL 7 WASHERS and have set them aside before you remove the plenum. I know of 2 guys who had to have an engine rebuilt because they dropped washers down in there.
To remove the plenum (in addition to the 5 bolts and two nuts I talked about above) You need to remove:
When the rear three are back in, simply reverse the steps... Although, I HIGHLY recommend you get a service manual which has these steps as well as pictures. If you are the lease bit mechanically inclined, you should be able to knock out this job in less than two hours.
if you are wanting a good way to see if your wires are ok, pull the trim plate off the front plugs, and idle the car at night with the hood up.. if you see arcing and sparking, the plugs are bad.
Iceman_ii on 3si.org
Posted on Feb 15, 2009
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Posted on Jan 02, 2017
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