Does it miss fire more under load but revs out cleanly in neteral, does it behave first thing in the morning when its cold but starts miss firing when hot? I had these symptoms and replacing the leads mostly cured it, later I replaced the coil and the engine has never ran better. The old leads tested ok with multimeter but I'm guessing the insulation broke down when they got hot.
It misfres under load on accelaration at lower revs.
It does this once iits warmed up at operating temp.
It does eventually rev cleanly in neutral after initially coughing at the beginning of the revs.
I'm thinking now to change the distributor and coil with the cap and rotor??.
Whtat are your thoghts on the valve stem seals while im at it?
Thanks,Originally Posted by leadfoot6
I will do what you have suggested and purchase new dizzy / coil.
Ive started removing upper intake.
The plan now will be ( after removing upper intake plenum):
1. remove fuel rail and get injectors cleaned ( never been done after 270,000 klicks so why not)
2. remove valve train and replace valve stem seals
3. remove - replace all 6 plugs and leads and spark hole seals
4. clean EGR valve
5. replace leaky rocker cover gaskets ( both )
6. replace with new dizzy / coil assembly as suggested
7. will do oxy sensor check as I go as well
Other repairs needed:
* power steering pump ( while i'm doing above)
* hydraulic belt tensioner
The car can be oof the road for a week or two as there is an alternative ride.
Thanks again for feedback and I will certainly let you know of outcome when done.
I am capable of most of the tasks you speak of, except that I think the valve stem seals are too much for me.
Instead, at approaching 200,000km on my TL, I am getting a new, well, newer, engine fitted later this year.
Mits-Fix is fitting a low km 380 engine and a few other bits and pieces for my peace of mind and convenience.
That way, I will avoid all of the usual things that need doing @200,000km.
The hardest part for me, besides paying the money, is driving to Melbourne and return to Kiama.
After that, my much loved AWD should last for many years yet.
I really have no idea what sort of car I can replace it with, especially when my access to funds is somewhat limited.
There is nothing within a sensible price that can offer me what my AWD has so far.
Having more power and low km engine reliability will be icing on the cake.
Last edited by leadfoot6; 21-07-2018 at 09:38 PM.
Leadfoot asked if an error code was generated.
I didnt check for error codes. There is extensive discussion about this 'missing' problem in earlier threads and I pretty much read all of them closely.
There is NO error code generated because of the fault.
The ECU doesnt have any ability to read the spark condition.
The threads described pretty much what I was experiencing. One post described how the cover and leads were changed and how this seemed to fix the problem; BUT 6 months later the problem reappeared and then the Distributor was changed and the comment then was that the car performed better than it had in a long time. Conclusion, replace the whole thing up front.
I bought a new dizzy from Mal. It has been in for well over a year and NO suggestion of the problem.
Mal advised a new unit rather than replace the coil. From the threads/ posts, it is clear that an absolute diagnosis is very difficult. It is not clear exactly what is the reason for the misfiring. I did disassemble the dud distributor and concluded that the coil is not that difficult to replace. That part of the engine is like the black hole of calcutta, and going in there for a second attempt to fix the 'missing' problem was more than I was prepared to do do. Hence, I just fitted a new one.
In an earlier life I was involved with the design, manufacture and factory testing of magneto coils. These coils are complex because of the many thousands of turns of fine wire, the termination of the coil wire to the spark plug lead, the encapsulation of the coil and the prevention of corona discharge, all combine to make the design and manufacture rather tricky. It is likely that the magna coil design is suspect but it takes many hours of use to bring it to failure.
My gut feel is that the problem is with the coil and not the leads or cover; BUT i dont really know.
That was my understanding, gained from reading previous threads.
Thanks for the confirmation, and the detailed explanation.
I know what you mean about not being able to replace this type of vehicle - which is why im making the effort to keep it going.
If the engine does eventually go and it needs a complete re- build the 3.8 swap would be then worth considering.
The car is immculate and my wife always gets comments about it and how rare they are in its nick. The only worry and the only way it would die is if some drop kik hits her - then its game over as far as insurance goes...
I hope someday these will start going up in value - maybe another 10 years on.
Just an update.
Its been slow going with repairs - fortunately the in- laws elantra is coming into use, so no major rush... but the wife does miss it - no pressure.
Intake off, covers off, plugs out, valve train off front head ready for stem seal replacement.
Got all the parts now :
Plugs ( platinum for both banks)
leads ( genuine mitsubishi)
valve stem seals
all gaskets
distributor ( complete) - (thanks for the heads up on supplier rumpfy)
Power steer pump
Will now need:
Timing belt ( Yipee!!)
water pump ( Yipee!!)
Waiting for proper tool to compress valve springs from ebay.
Took fuel rail off and had injectors cleaned and then replaced again - BOOM - fuel done - that was the easy part.
fortunately or unfortunately ( however you want to look at it) while everything off discovered that water pump is also seeping water - so guess what..
Probably meant to be - better finding it now while its disabled.
may as well do timing belt as well.
Will tackle power steering pump tommorrow.
One step at a time... do you ever feel while working on cars generally sometimes that your pushing it uphill?
Just have to suck it up and carry on - just hard sometimes to walk out to the shed on a freezing night.
will keep posting on progress - seems turning that key is a little while off....
Max.
just an update:
previously:
Injectors cleaned / replaced
power steer pump replaced
Recently:
all valve stem seals done ( that was tricky)
valve trains back on
new rocker cover gaskets / plug seals
new platinum plugs ( both banks)
Currently:
upper and lower oil pan re - seal ( was weeping)
Upcoming:
timing belt / water pump
distributor
leads
If you need more detail on what has been completed let me know.
Max.
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