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Mitsubishi GTO 1991 non turbo quad cam.engines cuts out/stops. cam belt inspection a very small amount of slack, compression test 2 front cylinders result no compression. problem?

Cam belt was only very slightly slack, not as tight as it should be.

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  • Andre Chamont
    Andre Chamont Nov 20, 2014

    Hi Guys,

    many thanks for all your advice and suggestions, very much appreciated. What I can't get my head around is the timing marks are all lined up and there is only a little bit of slack in the belt, not sufficient I would have thought to cause a 'slip', and if it did slip then wouldn't the timing marks not line up as they should.? The compression test on a couple of front cylinders showed low compression. I am still wondering if the problem isn't the ECU which is a weak point on these early cars so I'm told. The engine turns over ok and no undue noise is coming from the top end. It may still turn out to be a 'valve' problem but before I start getting the engine ripped apart I thought I'd explore other options.

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  • Expert
  • 59 Answers

Bent valves / sticky valves / tight valves. sounds like heads off to repair Did you rev it hard ?

Posted on Nov 20, 2014

Testimonial: "no, I just turned the engine over slowly"

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6ya6ya
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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: i accidently removed the cam belt without marking

As long as the timing marks on the cams are lined up with the marks on the head ( And the crank is lined up as well - marks on the block - TDC) then the belt should be lined up correctly, however, if you do need the marks, a new belt should have them and they aren't too terribly expensive - ($25.00) - You could also take your belt and a little bottle of white touch up paint (Or magic marker you can see)to the parts store and transfer the marks from a new belt to your old belt, but if it had any miles on it ( 10K+) I'd go ahead and replace it if I were in there that far...-

Posted on Aug 22, 2009

Testimonial: "cheers for that. very helpful"

  • 14036 Answers

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

look for weak valve springs.

Posted on Jun 22, 2009

fastboyz
  • 674 Answers

SOURCE: 1995 Chrysler 3.5 liter timing issue-what indicates the belt tensioner needs replacement?

hello ive read you questions and the other experts answers and they all have good points i just wanted to give you my point of view
this belt tensioner is to be locked down so it doesnt move once the initial adjustment is made. what i like to do is turn the crankshaft by hand to pull tight the belt on the non tensioner side and this is when i lock down the tensioner .

and yes when a car like this comes in we alway recomend water pump, tensioner , and any other idler pulleys that each vehicle may need also we take care of any oil leaks at the same time . oil or antifreeze getting on the belt will deminish the belt life.
and on your question on the cam brgs being loose , the cam is the length of the engine and it wont move enough to cause this kind of problem you would see a large oil leak first.

just a note
we do alot of customer cars that families take on vacation, and i dont want to be the one to ruin someones vacation by trying to save a buck. and when you are paying labor to have a belt replaced you expect it to reliable again.
let me know if i can help with anything else
paul

Posted on Sep 29, 2008

ghost45
  • 1280 Answers

SOURCE: one cylinder has zero compression. took head off

OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

Posted on Oct 04, 2009

  • 523 Answers

SOURCE: 91 mitsubishi gto has random engine cut out.

Does this car have its original ECU? I ask this because this and a number of early 1990s Mitsubishi cars/truckas had isses with capaciors leaking. In truth I believe it is a matter of when and not if. As the ECU begins to fail the engine can begin to run poorly ( I speak from experience after changing both ECUs in my Montero and my son's Doge Stealth (3000GT) ) I did have an issue too with my son's Stealth running poorly, by good luck I happened to be looking under the hood with poor lighting and noticed a faint blue spark from the wiring leads by the coil after a good look I fould a wire would ground out when the engine was throttled; this caused the engine to torque slightly causing the wire to rub and finally ground out.
I hope this may have helped,
Tom

Posted on Oct 10, 2009

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3 Answers

It seems to me that if the belt breaks , even on an interference engine: the valves will slam shut . Maybe it 50/50 chance either way.


belt has to be replaced any way
compression test on the cylinders.. tells you straight away
zero or low compression numbers ..valves bent

in an interference engine OHC or DOHC belt breaks
the cams stop dead and pistons continue to move up and down

non interference there is a gap between pistons and valves

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26334765-xld5pokq11zihdmvndqke0w0-4-1.gif

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My 91'Mitsubishi GTO, non turbo auto, engine stopped whilst driving.Will crank but no start. Cam belt is ok.


I would start by checking your spark plugs and the contacts on you distributor.

Sep 15, 2014 | Cars & Trucks

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Timing belt broke whats the chances of the valves being ok ,,rolled cam around it has same resistace it fells like


Since it is an "interference" engine, when the timing belt breaks it is possible for the pistons to contact any open valves and either crack/break the piston or bend the valve stem. The only way to rule these things out is to remove the head or use a "bore scope" and look in the cylinders through the spark plug holes. You could install a new belt and then do a compression test, but if it fails then you will have to take it all apart again. Rolling the cam isn't really a good test as any number of valves could be tweaked just enough not to sit flat in the valve seat and leak compression.

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Pajero 4m40 2.8d turbo


in front of the deisel pump the gear wheel is slightly cut/chip mark to the back of it take it out, and place it on t or n (t for turbo n for non turbo) .normal timming is good .If not hand turn until #1 piston is up and #1 cam shaft lobes are not touching cup & shim then set pump to desired mark

Jun 03, 2010 | 1996 Mitsubishi Montero Sport

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Mitsubishi 1991 model 4g15 engine replaced head gasket now it starts a bit on idle if i try to rev it it stalls and cuts off and starts turning backwards. if I remove a plug where there is compression a...


the blowing air out is good, means the valves and rings are good. the rest of the problems seem like your valve timming chain is out, did you replace or remove it? has anything to do with ignition been touched?

Nov 03, 2009 | 1997 Mitsubishi Mirage

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My turbo gto manual crunchs in ta 3rd evry time


if it only has problems going into 1 gear, it's most likely the synchro for that gear inside the transmission. but if this appeared out of thin air immediately after the hydraulic change, then i would definitely try re-bleeding the system first

Sep 29, 2009 | 1991 Mitsubishi 3000GT

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1991 gto non turbo


clogged fuel filter, or a short in your computer

Jun 30, 2009 | 1991 Mitsubishi 3000GT

1 Answer

Flywheel inspection cover location.


There is a small cover on the bottom center of the transmission. It's held in by 2, 8mm bolts.

To change the timing belt: first place the right side of the vehicle on a jack stand and remove the right front tire. Remove the plastic cover inside the wheel well to expose the harmonic balancer. Remove the serpentine belt (standard 3/8" rachet will set in the belt tensioner to relieve tension). Remove the harmonic balancer (19mm). Place a jack under the engine on the right side of the vehicle, then remove the engine mount from the top of the fender well, (17mm deep well socket and 17mm wrench required) it is not necessary to remove the mount from the side of the engine. Remove the timing cover, (10mm) it has 2 nuts. Loosen the timing belt tensioner, (10mm) then pry it away to relieve the tension. Slide the timing belt off of the cam gear.

To position the new belt, the cam gear has a arrow on it, and the cylinder head has a small dot. Align the arrow with dot, and make sure it is aligned (the arrow must point up). The crank gear has a notch and the engine has a groove to align the notch. Again, make sure the notch and groove are aligned (they again will be up). Place the new timing belt in position around the crank gear, the water pump and belt tensioner and leave the slack at the top. Again relieve any tension from the belt tensioner, and slide the belt on to the cam gear. Place a slight bit of tension on the belt and tighten the belt tensioner. Use the 19mm bolt from the harmonic balancer and turn the engine 2 complete turns and verify that the cam gear and crank gear are in their proper positions and aligned with the dots and notches. After 2 complete turns of the engine, and verifying everything is still aligned, re-assemble in reverse. No further adjustment is necessary.

Note:There is no timing adjustment for this vehicle, and if you are not properly aligned on the cam gear and crank gear it will not run properly.

Jun 19, 2009 | 1991 Ford Escort

1 Answer

I need the piston firing order for a VG30E or a VG30ode


My sincere apologies for the extremely delayed response.
I am personally going back to answer your unanswered questions.

I have only been a free contributor to this site for the past 4-months.

I do not know if you still need this information, but I am going ahead and answering it anyway.


1. Non Turbo =VG30E. Turbo = VG30ET. In any case the Engine Cylinder numbers, Firing Order, and Distributor Connections are the same.

For the 3.0L:
Firing Order:
1-2-3-4-5-6
Cylinders:
(back of engine)
5--------6
3--------4
1--------2
(front of engine)
Distributor:
....(back)
.6......5......4
.|.......|........|
V......V......V
|..................|
|..................|
^.......^.......^
.|........|........|
1.......2.......3
....(front)

2. I am not sure what what "cam adjustments" you were looking for. I am sure you probably have taken care of that or found what you were looking for. However, in most cases the person is really asking about the Timing issue.

Click on the following Link for the Timing Belt/Chain Diagrams.

Again, my sincerest apologies:
http://www.2carpros.com/car_repair_information/year/1988/make/nissan/model/300zx/1988_nissan_300zx_timing_belt_diagram_marks.htm

Nov 15, 2008 | 1988 Nissan 300ZX

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