Question about 1999 Mitsubishi Diamante

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1999 Mitsubishi Diamante engine misses, builds up fuel tank pressure

Gas tank builds up with pressure, when you open the cap it hisses and blows air pressure enough to knock you over! - engine skips/bucks in low speed traffic - total dead spots on the throttle but never totally stalls out if you feather it . Replaced so many parts: plugs, plug wires, cap, rotor, fuel filter, also replaced timing belt and water pump due to mileage (175K miles!) When the car gets past the "skip-zone" it runs like a race car - pleanty of power. Thinking fuel pressure regulator, not the fuel pump (runs so good at high speed and pulling hills.) I have not tested the fuel pressure because nobody has a guage that will hook up to this rail. I want my son to have this car to puddle-jump around - I hate to throw it in the junkyard for such a minor issue - its unsafe for him to navigate intersections not knowing if it will go or not go! No more Mitsubishi dealers here anymore.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Bogging while heavy accelration.

vacuum advance working ? do manuel check with cap and rotor button off and see if it's moving. chris

Posted on May 08, 2009

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co7196
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SOURCE: replaced alternator, now car won't start

disconnecting the battery on an alternator is a no no. that was how they used to ck generators but an alternator can be damaged with no load in the circuit. Try changing out your MAF sensor. 1st sensor coming out of the air cleaner. good luck.

Posted on Jun 14, 2009

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SOURCE: 2001 Galant ES-V6 DTC is P0304 - Cylinder #4 misfire

look for weak valve springs.

Posted on Jun 22, 2009

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SOURCE: 93 mitsubishi diamante, starts runs for 5 mins

Check all of the cables near intake. Make sure all of the sensors are pluged in.  Since if sensors have plugs that are loose than you could have a problem of inconsistent runing. 

Posted on Sep 16, 2009

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SOURCE: I have a 1997 Mitsubishi Galant with rough idle

I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.

Posted on Oct 22, 2010

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Fuel coming out from the breather pipe continuous squirt while. Engine running does not miss runs sweet Posted by Jeff thomas on Jul 16, 2016 FlagEdit More


Is your gas tank filled completely and are you parked on a hill ?
Take the gas cap off and listen for any pressure hissing.
Replace cap and try again. SWITCH ENGINE OFF FIRST.
Could be just too much fuel in tank.

Jul 16, 2016 | Cars & Trucks

1 Answer

Mitsubishi Diamante 2001, Car Will Not Start, Attempts to Crank, But no Fire. Blowing Engine Control Fuses repeatedly.


For the sake of completeness, here's the full no-start Troubleshooting Guide for the 2001 6 cylinder 3.5L MFI Mitsu Diamante, but the problem with your car is line item #6 - the ECC (Engine Control Computer) is shorted/dead. Without an ECC, the Diamante will (a) get no spark, since the ignition timing comes from the computer, and (b) get no fuel, since the fuel injectors are operated by the computer as well. The engine will turn over, since running the starter motor is a non-computer controlled matter of a correctly functioning ignition switch, a charged battery, and good wiring to a functional starter motor/solenoid, but will never start.
The clue pointing directly to the ECC failure is the blowing ECC fuses. These fuses are blowing to tell you that the ECC is shorted dead.
Since the ECC is expensive, exhaustively check out all other possible sources of the problems, but with so few problems causing loww of both spark and fuel, combined with the blown ECC fuses pointing directly to the ECC, it seems that the ECC is the only culprit.
Here's a used 2001 Mitsu Diamante ECC at Ebay for $175.

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=270828804340+&item=270828804340&lgeo=1&vectorid=229466


Priority Action Part Type Cause
1 Inspect Choke - Stuck or Improperly Functioning Choke.
2 Inspect Fuel Filter - Clogged or Dirty Fuel Filter.
3 Inspect Fuel Pump Relay - Faulty Fuel Pump Relay.
4 Inspect Fuel Injector Pressure Regulator - Faulty Fuel Injector Pressure Regulator.
5 Inspect Fuel Pump - Low Fuel Pressure.
6 Inspect Engine Control Computer - Incorrect Operating Information Being Delivered and Sent From The EEC.
7 Inspect Fuel Pump Strainer - Clogged or Dirty Fuel Pump Strainer.
8 Inspect Ignition Switch - Improperly Connected or Faulty Ignition Switch.
9 Inspect Battery - Battery Discharged or Faulty.
10 Inspect Battery Cable - Coroded, Broken, Shorted or Poorly Connected Battery Cable.
11 Inspect Solenoid - Starter Solenoid Faulty.
12 Inspect Starter - Starter Motor Faulty.
13 Inspect Wireset - Worn or Damaged Spark Plug Wires.
14 Inspect Ignition Coil - Faulty Ignition Coil.
15 Inspect Distributor Cap - Loose, Cracked or Worn Distributor Cap.
16 Inspect Spark Plugs - Incorrectly Gapped or Fouled Spark Plug(s).
17 Inspect Distributor Rotor - Loose, Cracked or Worn Distributor Rotor.
18 Inspect Fuel Tank - Fuel Tank Empty.
19 Inspect Carburetor - Worn, Faulty or Damaged Carburetor.

The fuel pump strainer is a sock-like strainer in the fuel tank on the input side of the fuel pump designed to protect the fuel pump by straining out any debris in the tank (similar to the way that the fuel filter protects the engine/fuel injectors/fuel pressure regulator).

Nov 27, 2011 | 2001 Mitsubishi Diamante

1 Answer

When i fuel up 88 blazer, there is pressure building in the gas tank, ( it hisses when i open the cap) and when driving down the road it seems to be very sluggish and sometimes even dies... but this seems...


the pressure in the fuel tanks supposed to be there,your fuel pump,,,pumps 180lbs of pressure to the engine all the time.your engine requires it. so if you do not hear that pressure when you remove the gas cap,you do have a problem. but it does sound like you have a possible fuel injector or maybe 2 fuel injectors clogging.simple to give you solution.add lucas fuel injector cleaner to your fuel tank.a clogged fuel injector will seem like an engine misfire also,just because fuel bulds in the cylinder at times,then the spark plug fires and then BOOM the engine misses while in motion. sound familiar? the lucas costs $5.00 and will treat 25 gallons of fuel. try this,and please let me know if this helps!!

Mar 05, 2011 | 1988 Chevrolet Blazer

1 Answer

When driving is get sluggish like it is going to die... and when opening the gas tank there is pressure (hissing)... after pressure is releaved from the gas tank the sluggishness seems to stop...


sounds like clogged or clogging fuel injectors,sorry for delay in the answer in your problem, been busy w/other issue . suggest easy solution to your problem, purchase lucas fuel injector cleaner,add to your fuel tank. cost $5.00 treats 20 gallons of fuel. just add the ammount that you need. follow the directions on the bottle, you can purchase at auto zone or advance automotive if need be to clear up the sputtering problem. note' there will always be hissing from the gas cap[normal] due to pressure from your fuel pump,it pumps around 180lbs of pressure to the fuel rail that operates your engine the fuel pressure regulator on the fuel rail;regulates the pressure to your injectors, that's what makes your engine run so smoothly.

Mar 05, 2011 | 1988 Chevrolet Blazer

2 Answers

No pressure in gas tank when the cap is opened.


I am not sure I understan tghe question. You should not have a lot of pressure in the tank. There are hoses that capture any vapors that are in the tank and eleviate pressure build up.
Most often I have found the engine light on because of gas tank vent, such as loose
or bad gas cap or the vent valve stuck open. The computer does a cycle ever so often
and maintains the vent pressure build up in the gas tank and vapor canister, and if the purge valve sticks open the computer gives a check engine light and code as the pressure is not in the vapor storage tank when called for.
If your worried about no pressure at all then I would change the gas cap and see if this helps

Feb 03, 2011 | 2000 Nissan Quest

2 Answers

1983 fleetwood southwing fuel system schematic for diagnosing / repairing no fuel getting from tank to engine intremittently - plenty of fuel in the tank itself...


Lots of possibilities.

Could have corrosion build up and rust clogging fuel tank pick up. Usually reverse air pressure helps, but would help to remove tank sending unit to see if you can **** out any water or gunk.

Could have vacuum building up in tank. Make sure charcoal canister purge valve is working right, and no hiss when taking off gas cap.

Could be fuel pump. Check pressure and volume, leakage, etc.

Could be filter. If carb, remember there is a small filter in the carb as well.

If fuel injected, may have bad pressure regulator or safety valve in line.
The pressure test results will help.

Mar 02, 2010 | 1983 Chevrolet Chevy

3 Answers

My fuel tank seems to be building excessive pressure, I've changed the gas cap twice, it doesn't matter if the tank is empty-full!! Also, the truck is hard to start unless I cycle the key two or three...


Yeah that is what it seems like thats why you have to turn your key on so many times to prime your fuel pump. Its not holding pressure in the line while truck is not running.

Sep 24, 2009 | 2002 Chevrolet S-10

1 Answer

I CAN HEAR A HISSING SOUND BY THE FUEL CAP AFTER I TURN OFF MY TRUCK


If you hear a hissing sound from the gas cap then the o ring that seals the tank is either cracked or tore. the tank has to build up pressure. thats where u r hearing the hissing sound replace it, it should stop after.

May 23, 2009 | 1996 Chevrolet C1500

1 Answer

Engine Random Misfire code PO-300


P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors. These are more common reasons, there are others but this a good start.

May 15, 2009 | 2001 Mitsubishi Diamante

1 Answer

Gas tank on a 1999 daewoo laganza


hi
I think you have problem in fuel tank ventilation the (EVAP) system do to ventilate the fuel tank and pull up fuel vapor to the engine
may be there is blocked pipe or electrical fault in valve (EVAP system) in engine room

Jun 21, 2008 | 1999 Daewoo Leganza

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