2001 Mitsubishi Galant Timing Belt problem

Tiny
PAUL64
  • MEMBER
  • 2001 MITSUBISHI GALANT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 110,000 MILES
I had my timing belt replaced along with the water pump, crank sensor and all the belts, tensioners etc by a auto repair place. Orginally I brought it in because a crankshaft sensor failed and my check engine light came on. So I did the timing belt replacement service for it as well. Since I got it back, it runs a little bit rough when I accelerate car. But it goes away when I pick up speed when I decelerate I can feel vibrations on the actual acceletator. It appears theres plenty of power but doesn't run the way it use to. I've had the motor mounts replaced so the vibration or the rough acceleration is not from the motor mounts. Any suggestions on what it could be or what to look for? Did the auto repair place may have not adjusted something properly or overlooked something else? Please help
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Sunday, October 24th, 2010 AT 5:12 PM

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Tiny
CARADIODOC
  • EXPERT
Hi paul64. Welcome to the forum. Your logic about the motor mounts makes sense except for the fact that one probably had to be removed to replace the timing belt. One of the three mounts will set the position of the engine. If the removed mount wasn't reinstalled in exactly the same spot, one of them could be rubbing metal on metal. That will transfer normal engine vibration to the frame of the car. All of the mounts have rubber isolators between the metal brackets but typically two of them can slide freely. They are centered by the one stationary mount or by repositioning one of their brackets. Mounts are especially suspect because you noticed the engine seems to have normal power, and the vibration changes with changes in torque on the engine.

Some engines use a "balance shaft" that is run by the timing belt. When it is not timed correctly, you will feel a miserable vibration, but it gets worse at higher engine speeds. That doesn't agree with your observations.

Caradiodoc
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Sunday, October 24th, 2010 AT 7:52 PM
Tiny
PAUL64
  • MEMBER
Hi
thats what I was thinking, i'm going to have to take it to another place and have them check the motor mounts. What about the air intake system or the throttle position? Would that cause any type of vibration?
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Tuesday, October 26th, 2010 AT 8:10 AM
Tiny
CARADIODOC
  • EXPERT
Rather than run from shop to shop, go back to the one that did the work and give them a chance to find the problem. If they are a reputable shop they will want to make it right and learn from their mistake. Any other shop will start from scratch and look for the cause of the problem without the benefit of being involved in the previous recent history of the car. It's like running from doctor to doctor when the first one doesn't cure you on the first visit. Each one will start fresh and you'll never get past the first round of tests.

The throttle position sensor tells the Engine Computer how far you have the accelerator pedal pushed, which way it is moving, how fast, and when it is at idle or wide-open-throttle. That has nothing to do with a vibration. The same is true of the air intake duct work unless something is mispositioned and rubbing, but I don't think you would feel that as a vibration.

Caradiodoc
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Tuesday, October 26th, 2010 AT 5:44 PM
Tiny
PAUL64
  • MEMBER
Yes that would make sense to stay with the same repair place but I do have reservations on their reputability. I don't want to end up paying for more parts and service on them guessing. After the timing belt service I did take it back because of the vibration and they replaced two motor mounts (both side mounts) the back and front have less than 20k on them. They appear to be fine. It think it lessend the vibration it only vibrates sometimes only feel it in the foot pedal especially when I accelerate from idle. I also hear an unusual a louder noise when the air intake opens or closes not sure which. But if it was the balanced shaft belt not time correctly or installed correctly it would be vibrating rougher as I drive faster?
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Thursday, October 28th, 2010 AT 7:43 PM
Tiny
CARADIODOC
  • EXPERT
I've never actually driven a car on the road with a mistimed balance shaft but from what people have told me, it's no fun. It's only purpose is to counteract normal engine pulsations which are more noticeable in four cylinder engines. A few six cylinder engines use them too. When they are out of time, even by a little bit, their vibrations add to and multiply engine vibration. You'll feel it in the steering wheel and seat. You will also feel an unusual amount of vibration by just holding your hand on the engine. If you do not, then I would continue looking for something rubbing that is transferring engine vibration to the passenger compartment. Start by looking at things that were disturbed, moved, repositioned, or removed and reinstalled when the timing belt was replaced.

Other common items that cause this are exhaust system hangers where the two parts of the metal brackets are touching each other, a binding flexible exhaust joint at the rear of the engine, and anything on the engine that is rubbing against the body.

You might also listen by the tail pipe for an unusual putt - putt sound when the engine is idling. That would be a sign of a bent valve. On some engines, improper procedures during the timing belt replacement can cause some of the valves to be damaged. Really serious damage will occur on those engines if the timing belt breaks while driving. I suspect that is not the problem because what you're describing sounds like a higher frequency vibration. A bad valve will still allow the engine to build normal power, but you will feel the vibration as about two thumps per second at idle.

Caradiodoc
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Thursday, October 28th, 2010 AT 8:18 PM
Tiny
IMAFREQUENTDRIVER
  • MEMBER
Hello Paul64,
I am experiencing the exact same issue as you. I have a 2001 Galant ES with 130000miles and just got my timing belt changed along with the other belts and have been experiencing odd engine vibration through my gas pedal and steering wheel. I've looked over the engine several times and have been unable to locate the source, but have been thinking about the balance shaft. I need to ask what was your solution to this problem? Thanks.
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Monday, May 16th, 2011 AT 12:22 AM
Tiny
PAUL64
  • MEMBER
Hi imafrequentdrive
i didn't get the problem resolved completely, I did take it to another repair shop and they couldn't find anything wrong. A few months after that, I took it in for a smog check and it passed so it was nothing wrong with the timing belt replacement or an air leak, a few months ago I noticed that the catalytic converter was going bad but not too long ago my parked car was hit by a drunk driver and it sustaind left front end damage (drivers side). When I got my car back from the autobody shop I did notice that a lot of the vibration was gone. I notice that the foot pedal did not vibrate anymore so my guess was that when the timing belt was replaced the repair shop disturbed something in the front left of the engine compartment where the air filter sits. Right now the vibration that I notice is definitely coming from the exhaust system and not the balance shaft atleast in my case.
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Saturday, May 21st, 2011 AT 3:06 AM
Tiny
JEEEZJOHN
  • MEMBER
Hi 21 year old with a 2001 Mitsubishi 2.4L

My car had been off the road for 8months due to crack in the intake manifold. This crack was caused by heavy front end vibrations (to the point my dashboard has a couple cracks)

I replaced the intake manifold and I changed all engine/transmission mounts.
I'm almost certain the cause of the vibrations in your case as well as mine is NOT the engine mounts.
I still hear vibrations (especially during acceleration) and I feel vibrations in my gas pedal. So all the mounts did was restrain the shaking.

Lastly my timing belt was done before my intake manifold cracked. I experienced vibrations before and after.

My last guess is maybe the harmonic balancer needs to be replaced. Anyone have better advice?
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Tuesday, November 12th, 2013 AT 7:14 PM
Tiny
MRBECKYMAN
  • MEMBER
No one said anything about the oil pump. It has a heavy weight inside of it and if not timed correctly can make the vehicle vibrate or shake like crazy. I also think it could be cv axles or joints. I have this problem as well.
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Monday, April 11th, 2016 AT 2:07 PM

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