2G A Flurry of Issues

[Chanceb23]

Hello Everyone,

So my GST has been plagued with a flurry of issues all at once. I am of the mindset that there is a one or two culprits causing my headaches but looking for a little assistance and advice. So my car was running fine, it sat for about 2 weeks and when I started it up it idled rough then when I got on it and spooled the turbo it stuttered and the car would buck (best way I can explain it), a couple miles down the road the check engine light came on. I went to Autozone and had it scanned with 02 sensor and fuel pressure sensor throwing the 2 codes I had. I got it home and noticed a handle full of oil drops on the ground, it looks like it is coming from the turbo. I pulled the spark plugs and wires and everything looked good. I took it for a spin a few days later and the problems still existed.

So my initial thought is crankcase pressure and blowby gumming up the system and I may be totally off. But I am thinking changing the o2 sensor, replace the pcv, run a catch can from the pcv, and throw on breather filter on the VC. I am hoping this will help.

Is there any other areas I need to be looking at that could be causing all these issues all at once?

 

[habitatguy187]

Oil leak from the turbo is probably just the turbo oil drain line.

Keep your factory pcv in place. You want it working so that I can remove all those nasty blowby gasses out of your oil.

As for the bucking, who knows. I would start with a boost leak test and if that doesn't fix it, spark plugs with correct gap and go from there.

 

[pauleyman]

Hello Everyone,

So my GST has been plagued with a flurry of issues all at once. I am of the mindset that there is a one or two culprits causing my headaches but looking for a little assistance and advice. So my car was running fine, it sat for about 2 weeks and when I started it up it idled rough then when I got on it and spooled the turbo it stuttered and the car would buck (best way I can explain it), a couple miles down the road the check engine light came on. I went to Autozone and had it scanned with 02 sensor and fuel pressure sensor throwing the 2 codes I had. I got it home and noticed a handle full of oil drops on the ground, it looks like it is coming from the turbo. I pulled the spark plugs and wires and everything looked good. I took it for a spin a few days later and the problems still existed.

So my initial thought is crankcase pressure and blowby gumming up the system and I may be totally off. But I am thinking changing the o2 sensor, replace the pcv, run a catch can from the pcv, and throw on breather filter on the VC. I am hoping this will help.

Is there any other areas I need to be looking at that could be causing all these issues all at once?

You are throwing darts. Give us the two codes please. Fuel pressure sensor? There isn't one. Car is telling you something. It isn't crankcase pressure. You wouldn't have no issues one day and suddenly you do the next day unless you broke something. In that case usually other symptoms show up heavily also.
Profile states you have an evo316g but no tuning, no fuel etc. What boost?

You are throwing darts. Give us the two codes please. Fuel pressure sensor? There isn't one. Car is telling you something. It isn't crankcase pressure. You wouldn't have no issues one day and suddenly you do the next day unless you broke something. In that case usually other symptoms show up heavily also.
Profile states you have an evo316g but no tuning, no fuel etc. What boost?

Btw not the code description. The actual DTC code.

 

[Chanceb23]

You are throwing darts. Give us the two codes please. Fuel pressure sensor? There isn't one. Car is telling you something. It isn't crankcase pressure. You wouldn't have no issues one day and suddenly you do the next day unless you broke something. In that case usually other symptoms show up heavily also.
Profile states you have an evo316g but no tuning, no fuel etc. What boost?

Let me clarify this is not the same GST in my profile build. This is a second one that is stock except for exhaust. I also meant fuel pressure solenoid not sensor, code p1105. The second code is p0420 and the car has welded cat delete to cat back. I never had an issue during the first 4 months of ownership just when I let it sit.

 

[pauleyman]

Let me clarify this is not the same GST in my profile build. This is a second one that is stock except for exhaust. I also meant fuel pressure solenoid not sensor, code p1105. The second code is p0420 and the car has welded cat delete to cat back. I never had an issue during the first 4 months of ownership just when I let it sit.

Please start a 2nd profile. What is the status of maintenance on this car? Any history?

P1105 is not a fuel pressure solenoid. It's a MAP code.

P0420 is not an o2 code. It's a catalyst efficiency below threshold for bank 1.
Most likely because you have no cat and there isn't anything wrong with any sensors.

I would focus on the MAP sensor and it's harness first. Check the obvious first. Broken, cracked or deteriorated connector then test the sensor.

I would not add anything else to the car and don't chase ghosts as your initial post suggests. Find and fix the root cause first.

 

[Chanceb23]

Please start a 2nd profile. What is the status of maintenance on this car? Any history?

P1105 is not a fuel pressure solenoid. It's a MAP code.

P0420 is not an o2 code. It's a catalyst efficiency below threshold for bank 1.
Most likely because you have no cat and there isn't anything wrong with any sensors.

I would focus on the MAP sensor and it's harness first. Check the obvious first. Broken, cracked or deteriorated connector then test the sensor.

I would not add anything else to the car and don't chase ghosts as your initial post suggests. Find and fix the root cause first.

Thank you for your help. Second profile has been started (and yes I have a weird addiction to red cars). Since owning the car I has changed the fluids replaced the alternator belt, spark plugs and wires. The only thing the previous owner could tell me was that it was missing the belt and had a big oil leak. It was his son's car that he didn't want when he moved out. I found what I thought was the oil leak culprit as the valve cover was drenched. I cleaned it and replaced the gasket and the seals around the plugs. I didnt see any evidence of a leak after that but now everything under the turbo is drenched but I can't see if there is oil anywhere above the turbo. This newly found leak all started when the codes came on and all the other problems started.

 

[pauleyman]

Thank you for your help. Second profile has been started (and yes I have a weird addiction to red cars). Since owning the car I has changed the fluids replaced the alternator belt, spark plugs and wires. The only thing the previous owner could tell me was that it was missing the belt and had a big oil leak. It was his son's car that he didn't want when he moved out. I found what I thought was the oil leak culprit as the valve cover was drenched. I cleaned it and replaced the gasket and the seals around the plugs. I didnt see any evidence of a leak after that but now everything under the turbo is drenched but I can't see if there is oil anywhere above the turbo. This newly found leak all started when the codes came on and all the other problems started.

Leak is probably least of your worries unless it's pouring out. Go after the codes and get back to us. Check the basic stuff, physical damage, missing retainer clips etc. Cat issue you probably can't fix at this time unless you put a cat on it.

 

[Chanceb23]

Leak is probably least of your worries unless it's pouring out. Go after the codes and get back to us. Check the basic stuff, physical damage, missing retainer clips etc. Cat issue you probably can't fix at this time unless you put a cat on it.

I ended up taking it to a shop to check the MAP and it does need replaced. I just wasn't going to pay what they wanted and just ordered the sensor myself. I also noticed that there is also a coolant leak, I'm pretty sure its the water pipe that runs from the pump as the coolant is leaking onto the alternator and then dripping off to the floor.

 

[AWD-Tony]

I ended up taking it to a shop to check the MAP and it does need replaced. I just wasn't going to pay what they wanted and just ordered the sensor myself. I also noticed that there is also a coolant leak, I'm pretty sure its the water pipe that runs from the pump as the coolant is leaking onto the alternator and then dripping off to the floor.

There is an oring that goes on the end of the pipe into the WP. Could be the oring or the pipe itself can be rotted. Unfortunately, you're going to have to pull the wp to inspect both. When is the last time it had tbelt/wp serviced? There's also a rubber hose off the water pipe that goes to the oil filter housing/cooler.

 

[Chanceb23]

There is an oring that goes on the end of the pipe into the WP. Could be the oring or the pipe itself can be rotted. Unfortunately, you're going to have to pull the wp to inspect both. When is the last time it had tbelt/wp serviced? There's also a rubber hose off the water pipe that goes to the oil filter housing/cooler.

I have not had any of it serviced. I just got this car 4 months ago. So far I have replaced the alternator belt, brakes, fluids, 02 sensors and valve cover gasket. Now I have the MAP on order and while waiting for it i am working on finding the additional oil leak and now this coolant leak.

 

[AWD-Tony]

I have not had any of it serviced. I just got this car 4 months ago. So far I have replaced the alternator belt, brakes, fluids, 02 sensors and valve cover gasket. Now I have the MAP on order and while waiting for it i am working on finding the additional oil leak and now this coolant leak.

I see. Put tbelt service and wp on top of that list. Broken tbelt will cause engine damage.

 

[motomattx]

The factory map sensor will not affect the way that the car runs at all, its only function is to monitor the egr valve for emissions purposes.

 

[waltah]

So my GST has been plagued with a flurry of issues all at once.

What you've got is a fairly standard 'new GST' experience. I've had mine about as long as you''ve had yours, I drove it 100 miles to get it here without remarkable issues other than a very harsh ride and check engine light, and as of today I've listed 75 failures and issues. Most of them are fixed now, many were or are minor, but even looking just at the kind of issues you mention -- CEL codes and leaks -- I've got about what you've got. There were about 45 items just from the first week of looking things over; the rest came along as I started fixing things.

Few people sell one of these cars because they're tired of it: They sell it because they realize they're in too deep. So there's good news and bad there ... The good news is you got the car and the other news you're already starting to see. You will discover more of it as you start work.

Start making your list and start fixing stuff as you pin it down. With the help you can get here it can just about all be done in a driveway but it does take time.

Is there any other areas I need to be looking at that could be causing all these issues all at once?

It has already been mentioned but I want to emphasize the timing belt. That's the first thing to check on any Mitsubishi in these years. If it breaks you've got at least a bunch of bent valves and at most "where can I get another engine." They're supposed to be changed every 60k miles and often give no warning of a coming failure. If you didn't get convincing info about when it was changed from the former owner take off the top timing belt cover (be careful not to drop those screws down in the hole -- if you do you MUST find and retrieve that screw before turning the engine over) and inspect the belt. It should look roughly new --- no cracks, obvious wear, missing chunks of rubber. And it should be pretty tight after the engine has been run.

My CEL was the same as yours -- my cat is there but dead. The harsh ride was oversize tires and wheels, inflation pressures over 60 PSI, and riding height almost 2" low due to incorrectly adjusted coilovers. At the beginning every time I'd fix something I'd find three more issues -- but things are slowing down -- just one new issue per week now.