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New MVV Engine Installed, need help/advice

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Z

Zodiiak

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Discussion starter · #1 ·
Hi All,

My last engine blew so I had a new one recently installed. A JDM MVV engine to be exact. After installing the engine, the motor runs beautifully, but the car idles pretty rough -- the RPM's dip down, and it sputters as if it's going to stall. Also, I just noticed that when I turn on the AC or Defrosters, the RPM's fluctuate upwards. The service engine light came on a few hours after installing the new engine, but there isn't anything wrong with the motor, has only 30K on it.

I have a few ideas of what I think it could be, but I wanted to know if anyone has had this engine installed before or if you have any thoughts on what could be the issue here.

Bit of a sidebar here, but anyone have any idea what the HP is on this engine? It's alot stronger than the stock GT engines, but I won't be able to dyno it for a while.

Anywho, any thoughts or ideas on the issue would be greatly appreciated.

Thanks,

Z
 
#6 · (Edited)
Devin01RT said:
Need more information dude, give us the engine code or something. MVV? Maybe he put in a MIVEC? :wtf:
Click to expand...
:idea: MVV = Mitsubishi Variable Valve-timing! :agreed:
That would explain idle-control issues, especially if the stock ECU is being used. (no parameters for recognizing MIVEC)

Is this the 6g73, perhaps? Google tells me it's a 2.5L SOHC w/ MVV. Available in the 2nd gen JDM Diamante.

EDIT: Wiki says the most powerful Diamante engine is/was "a 3.0 L MIVEC V6 rated at 270 hp". I think it's just a 6g72 variant.
 
#10 ·
ARACHNO said:
its probably the GTS engine.
Click to expand...
I was thinking the same but the last paragraph on the wiki page only talks about a 4cyl.

wiki said:
Mitsubishi says air/fuel ratios of up to 25:1 are possible with its lean-system powerplant. The single-overhead-cam 1,468-cc 4-cylinder boasts a 10-20% gain in fuel economy (on the Japanese 10-mode urban cycle) in bench tests compared with its conventional MPI powerplant of the same displacement. The vertical vortex engine has an idle speed of 600 rpm and a compression ratio of 9:4:1 compared with respective figures of 700 rpm and 9.2:1 for the conventional version.
Click to expand...
Hopefully he can provide more info...
 
#11 ·
Hm, this thread piqued my interest a bit. The only MIVEC V6's I can think of is the 6G72 (Sigma), 6G75 (4G Eclipse), 6A12 (FTO) and the 6B31 (Outlander). You need to provide pictures of what's lurking under the hood, Zodiiak.
 
Discussion starter · #12 ·
Ok, I'll take some pictures when I get home (hopefully it isn't too dark) and thanks for the speedy replies. It's an MVV engine - Mitsubishi Vertical Vortex, v6. I'm fairly sure it isn't a MIVEC engine (although I wouldn't mind). This mvv Engine is extremely strong too, it doesn't feel like 210, it feels like 250 stock.

My thoughts were that I probably needed a new chip to go with the engine...but I wanted to hear some feedback.

I was also finding that only the Diamante's had these engines (2.5 though?), but I don't think you could fit a Diamante engine in a 3G, can you?
 
#16 ·
If his information is accurate, it's a 6G73. That's the only 2.5L V6 Mitsubishi made.

By the way, I found more information on this engine. 00TampaBlueGS got it right. :)

Displacement, cc: 2497
Engine model: 6G73
Max.power (Net), kw(PS)/rpm: 175 ps (128.71 kw) / 5500 rpm
Max.torque(Net), N*m(kg*m)/rpm: 23.0 kg*m (225.55 N*m) / 4500 rpm
Power density: 8.17
Engine type: V type 6 cylinder SOHC 24 valve
Engine information: Lean-burn MVV
Fuel system: ECI-MULTI (electrically controlled gasoline injection)
Turbocharger: No
Fuel type: Unleaded regular gasoline
LEV system (Low emission vehicle): No
Compression ratio: 9.5
Bore, mm: 83.5
Stroke, mm: 76
Fuel consumption at 10-15 modes, l/100km: 8.9
Click to expand...
From that information, it's less powerful than the 3G's 6G72, but I guess being a small displacement V6 gave the engine a much more lively powerband, and I believe the 6G73 is about ~80 pounds lighter than the 6G72. For the guys that hates metric units, the engine puts out ~173 HP and 166 lbs.-ft of torque.
 
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