I have some running issues with my 3KGT. I just did a JDM engine swap, and the car just isn't running like it used to.

The car bogs real bad when first started. If I don't let it warm up at all, it won't even move the car when I let out the clutch, it will just die. I replaced wires, plugs, switched coils, fuel rail, injectors, Fuel pump, fuel filter. It seems to run alright once it has been warmed up, but at times when I hit the gas, I know the engine has the power to push cause she let's me know for short bursts, but then misses all the way through pretty bad.
The Camshaft sensor is advanced as far as it will go. If I put it around the middle, or retard it at all, it runs very poor, and sometimes won't even idle.

I was told to get a data logger, but not really sure how to use it, and I wouldn't even know what I would need to read the logger. I don't have a labtop, only a pc.
I also pulled out my computer to see if my capacitors were leaking, and it looks good.
I checked my air intake, and decided on another air intake, and MAS seems to be working fine.
I am not getting a reading on my coolant temp either, so I replaced the sensor, but I think the guage just isn't displaying temp correctly. If the sensor is working, then I would assume the computer knows the temp even though it isn't displayed inside the car.

The only other thing I can think of is that the timing is off by a tooth or so.
If the timing is off by one tooth, then it is possible that I have maxed the ability to adjust timing with the Camshaft sensor, and the computer doesn't have enough adjustment in it either to alter the timing just right.
I didn't touch the timing belt when I swapped the motor, I assumed it was set.
Any help would be greatly appreciated since this has been an on going trial and error ordeal for 3 months now. If you have a datalogger and can figure out my problem I will be more than willing to compensate you.

You need to talk to Jeff -- Oh Jeff!

He's 440 4x4.

He'll answer shortly I'm sure.

SJ

_________________


Racing is life. Everything else is just waiting.

http://umg.mn3s.org

http://ummo.boards.net

What did you do to the engine before installing it?

Have you checked the compression?

When I did the engine swap, I had to change a few things over.
The radiator and thermostat housing had to come off, I guess in Japan, the filler neck is on the radiator itself.
I got a gasket for it, and hooked it all up. The intake was different, so that needed to be taken off, and I used my old one. The one that was on it had different vacuum lines, and actually one was broke.
The driver's side motor mount was different, as was the harmonic balancer. The harmonic balancer had a V-belt for the power steering, and mine had three ribs. I also had to replace the tensioner from my old motor. Currently I don't have power sterring since my pump still has the ribbed pully on it.
I changed the injector plug wires as well. The j-spec had the plugs for each injector on each side of the motor. I re routed it to be on the same side as originally so I could fit the plugs together.

that's about all that was different that I needed to change that comes to mind.

Bear with me here, I'm going to ask you a couple more questions.

What year is your car?

You said you replaced the tensioner. Are you refering to the tensioner for the alternator/AC belt?

Sorry SJ - we had an inspection at work yesterday which I spent the last week preparing for.... Blah on that.

Anyway - I'll wait to see the response back to the question Greg posed.

Sorry, to answer your previous question, I did not check the compression.
The tensioner I switched out was for the AC belt. The tensioner for the timing belt wasn't touched. However I do have a couple of extra ones.

I have a '92. The last year that the camshaft sensor could be adjusted.

I also did have to change out the tensioner for the power steering pump, but it currently isn't being used since the pully on my power sterring pump doesn't match the tensioner or the harmonic balancer.

More questions:

On the intake plenium that came with that engine, what did it say on the top? Did it say, 2500, 3000, or 3500?

Our cars only had a V belt for the PS pump in 91, however, the motor mounts are all the same between 91 & 92 (unless the previous owner of that engine switched to a newer style mount). You can swap the crank pulley from your old engine though.

Good questions. The intake said 3000. The mount that was on the motor had the bolt pattern a bit different than mine, and they were huge. Maybe like 2 inches taller. I assumed the motor came from a galant or stealth. It was my understanding that the galants had the same motor, but they were switched around. Intake was on the driver's side, but I don't know the truth to that. That is why I thought the power sterring belt was different, and intake and motor mount.
I was able to beat off the harmonic balancer from my old engine. However when I tried on the JDM motor, I could see the timing belt coming off with it. So instead of risking the belt coming off, I just left the old one on there.

Yeh, the crank pulley and sprocket like to stick together. You have to wiggle it off (sometimes that doesn't always work). Take some PB blaster and spray it into the hole for the alignment dowel. You will have to have the crank pulley bolt off because the washer gets in the way of the hole.

I have a couple suggestions too. Take the rear fuel injector harness off your old engine, and swap it onto the new one. While you have the intake plenium off, do the compression test.

After you do those, we're going to need to set the ignition timing. This is going to require a timing light. Are you familiar with how to use it?

Where did you get this engine from?

I don't want to jump to any conclusions so early but if you think the motor came from a Galant (possible since the tb is on the drivers side) then it would be a 2500. I don't think they ever put a 6g72 in the Galants US or JDM I could be wrong. Greg is there a way to tell? There should be casting number on the block.

_________________
'94 vr4- Now with extra slowness

I already moved the wiring harness for the fuel injectors over from my blown engine. I also moved the knock sensor wire to the other side of the motor because it was routed to the opposite side of the engine. When plugging in the harness, it wouldn't reach, so I changed that and the injector harness at the same time.

I could be mistaking that it was a galant. Maybe Diamante? I thought there was another vehicle made besides the stealth that accepted the 3.0 L engine from Mitsu.

I found the motor on Ebay. EricJapanengines.com or something like that is the seller. They are based out of Chicago. If you look for JDM engines on ebay, he is a seller of many vehicle types. He even knew to ask me what month my car was produced, so he made sure the Cam shaft sensor would work on my car.
I found the motor for like $927 with tax.

Sorry for the confusion. The TB and the intake were on the same side of the engine as my old motor. What I meant is that I heard that there was another car besides Stealth/3000GT that used the same motor, but the motor was turned 180 degrees in comparison to our cars. So if you are looking under the hood, you see the tranny on the left, or drivers side, but this other car had the same motor, but the tranny was on the right side/driver's side. So the intake would actually be on the front of the motor, and would suck air from the driver's side rather than from the passenger's side like ours.

Again, not sure how it would be possible, and I think the enginerring would all have to be redone, why wouldn't Mitsu make the car just the same???
Who knows. This is my first Mitsu, last car was an integra. I don't know much about them as I am a fairly new owner.

If possible, can you post a link to the e-bay auction for your exact motor? I'd like to see what it looked like.

...and yes, the early Diamontes (or however they're spelled) had our NA motors. The Galants at the time had the 4G63.

I'd still recommend doing a compression check.

In the mean time, I'm researching to see if the cams are the same between the 2 motors. I don't think they are, but need to confirm it.