actually, thats not the case with the cars.
the capacitors that fail on the early mitsus (89 to 92, give or take) were made by rubycon. Other than those caps failing, the ecms were unbreakable.


and the problem was solved around 93, never having returned.

 

Sorry about not responding sooner, but I was on a car trip (a friend's car) last week. First trip in 14 months (Yellowstone,Bad Lands, etc).
Today I looked at the mb of the cpu and could not see any burnt marks on the top or the bottom of the mb. I could not smell any burnt smells. The capacitors looked good (no domed tops, bulging, or leaking). In fact, the only thing I could see on the mb was that there seemed to be some fuzz (like light white cotton) on a couple of spots on the bottom of the board.
My mechanic friend is no closer to the solution.
I don't know if I should spend around $200 on getting my cpu rebuilt or not.
At a auto salvage yard about 90 miles away, they have a 1990 Montero, but you have to take the cpu out yourself (I know it's easy if the side's not caved in) and they want $100 for it with absolutely no guarantee if its good or not and will not accept a return.
Any other ideas or input is welcome.

Buffalo

PS: The caps are Rubycons
And again, I was driving along at around 65-70mph and the engine just quit.
Just like you turned the key off. No jerking or stange noise or anything else out or the ordinary.

 

this is not that hard a problem to figure out.
if your mechanic cant fix it, hes not a very good mechanic.

take it to someone better.

 

Sorry for the long delay.
ManyBrews says it not a hard problem to figure out, but gives no hints on how to do it.
My mechanic friend did put a vacuum test on the vacuum line going to the fuel pressure regulator (pulled it off the manifold and put the vacuum between the manifold and the fuel pressure regulator) and it held the vacuum.

Hey jrlltmb2003, do you still have that other ecu?

Anyone out there have one. I will pay the shipping +.
The number is MD146946.

One other thing is that there was aprox 2qts of gasoline in the oil pan.
Now the only way I know of to get a lot of gasoline in the oilpan is to either pour it in, have it go down the cylinders (injectors continually on) or through a vacuum line (most likely the vacuum line that goes to the fuel pressure regulator).

Since the engine quit immediately while traveling at around 65mph with no coughing, stuttering, surging, etc and the ignition is now putting out a good spark, I would think that it almost has to be that ALL the fuel injectors went wide open. That is one way that so much gasoline could have gotten into the oilpan.
Any other ideas??
Any wires to check or anything else? I would imagine that the fuel infectors need a voltage to open up.
Thanks for any advice to this nightmare.
Buffalo
PS: I just came back from a 3 week visit with my 94yr old mother and I really didn't have much internet contact.

 

Well, I sent in the ecm to AvPro to get reconditioned.
Hopefully I will get in back in a week or so and try it out.
Thanks for your suggestions and I WILL post back with the results.
Buffalo
PS: Has anyone here dealt with the AvPro Company in Ft Myers Beach, FL ?

 

what, are you paying me to diagnose it for you?
have your "mechanic friend" do the typical diagnosis.
check for spark. check for fuel pressure. check for injector pulse. Check timing.

do I need to hold his hand or something?

 

Manybrews, it would be nice if you could hold his hands.
This is a summary of what was done.
Around 2 qts of gasoline discovered in the oilpan.
Fuel pressure regulator vacuum line holds a vacuum indicating that the diaphragm is ok.
Timing belt appears ok.
Timing marks all line up.
Nice blue spark.
O2 sensor pulled.
Trouble reading the injector pulse; perhaps he doesn''t know how or doesn't have the right equipment to do it properly.
So, it appears that the problem is too much fuel in the cylinders, enough to put 2 qts of raw fuel into the crankcase.
Since the diaphragm in the fuel pressure regulator appears to be ok, the only other way that the crankcase can get that much gasoline into it is to either manually pour it in or have the injectors do it, which would mean that the injector(s) are going full on continuously or close to that.
Agree?
Any other ideas?
Thanks.
Buffalo

Hopefully the repaired ecm will be here sometime next week.

 

Well, AvPro just called and said the ecm was unrepairable. They said a capacitor leaked and put a hole underneath it and shorted out the 5v regulator and that sent 12v throughout the 5v circuitry.
Damn.
Anyone out there have an extra MD146946 ecm?
Hell, even one that I can send in to get rebuilt.

I tried the local (125 mile radius) junkyards with no luck so far.
Buffalo
Thanks

PS:Most of the places that I received replies from (auto parts search) want around $400+ for a used one with a 30 day warranty.

 

jrlltmb2003
You were right all along. I finally found a used ECU (after I sent mine in for repairs and was told it was unfixable by them) and it fired right up. If I could have found one as easily and cheaply as you, I would have tried it right away. Unfortunately, here in the mountains of Colorado, it is hard to find junkyards that have Monteros.
Thanks again for the CORRECT answer.
My mechanic friend thought it was a slipped timing belt and had the radiator,etc all out of the vehicle down to the removed timing belt covers.
Thanks again. I just got it home a couple of days ago.

 

wish you would sell one of those ecu computers to me i cant find one here in washington my email is mantocall@gmail write me if you can i will pay a decent price for one but i am not willing to pay 400.00 like most of these places are trying to charge