A Vibration When Nearing 100kmph

[hyndai]

Guys;

help me with this

i have a Hyundai Jimmy (elantra hatch back). recently i have noted that it does not have the same pulling power it had earlier, but strangely this is occasional. I can seriously feel like some one is holding the car back. i also smelled some unburned petrol when starting the car several days and it had lot of petrol in it, not just a faint smell. yesterday also i felt this lack of pull and tried to reach some speed, the engine is too noisy and when reach 100kmph i felt a unusual vibration( in the stearing wheel specially) earlier there were no problem reaching 120/130. No unusual sounds nor vibrations.

i suspect a faulty spark plug, in morning when engine is cold, it misfired several days with Check engine Lights On.

i also had some hand break trouble which led to break binding situation some time back, but i fixed it. I also fill up some gas to A/C system and when turning on A/C i feel a greater impact on momentum than what i used to feel.

some info about car; 1600CC DOHC 16V , ABS, All Disk Break, Tires new(Franklin), Wheel alignment and balancing done recently.

pls help!!!!!! This is frustrating.

[VWvortex]

  hyndai said:

I can seriously feel like some one is holding the car back.i

Are you sure about this? You may need to consult a 'Kattadiya' on this matter bro :-)

[isam]

  VWvortex said:

Are you sure about this? You may need to consult a 'Kattadiya' on this matter bro :-)

ROFL

Anyway, you can check the Air filter of your car. If you did not replace it recently, or have never replaced it and if it looks dirty and hard to the touch, then its time to replace it. A dirty air filter will kill the pulling power.

Also get plugs cleaned.

[Ripper]

  hyndai said:

Guys;

help me with this

i have a Hyundai Jimmy (elantra hatch back). recently i have noted that it does not have the same pulling power it had earlier, but strangely this is occasional. I can seriously feel like some one is holding the car back. i also smelled some unburned petrol when starting the car several days and it had lot of petrol in it, not just a faint smell. yesterday also i felt this lack of pull and tried to reach some speed, the engine is too noisy and when reach 100kmph i felt a unusual vibration( in the stearing wheel specially) earlier there were no problem reaching 120/130. No unusual sounds nor vibrations.

i suspect a faulty spark plug, in morning when engine is cold, it misfired several days with Check engine Lights On.

i also had some hand break trouble which led to break binding situation some time back, but i fixed it. I also fill up some gas to A/C system and when turning on A/C i feel a greater impact on momentum than what i used to feel.

some info about car; 1600CC DOHC 16V , ABS, All Disk Break, Tires new(Franklin), Wheel alignment and balancing done recently.

pls help!!!!!! This is frustrating.

well it seems like that the engine is not able to deliver enough power since you notice the effect more with AC on.. can be many things from injector issues to electrical ones..

why not take the vehicle to a good mechanic and check it out... If check engine light is on it's better you get it checked ASAP before driving around at those speed me thinks

[maersk]

  VWvortex said:

Are you sure about this? You may need to consult a 'Kattadiya' on this matter bro :-)

Funny but I'm sure hyndai doesn't mean it's because of 'yakku & bhuthayo' or similar kind but his car is seriously sluggish sometimes. Sometime back same thing happened to me with my Nissan & diagnosis as faulty MAF sensor.

Best thing is to check the engine using a scanner since your engine check light is also on.

Most important is to select a trustworthy place to do the scanning. Don’t forget there are many dodgy places around us nowadays & they will suggest various unnecessary things together with what need to be done.

I trust my mech who doesn’t even have a scanner but he can diagnose many faults reading error codes manually. When necessary he will direct me to better equipped place after briefing me about possible faults so I have a fairly good idea what to expect.

Good luck & keep us posted.

[hyndai]

Is it ok to clean plugs? The current plugs are nearing 30000k. Is this too much runnig for a set of spark plugs? Is NGK a good brand? please give me some advices on these. I also think that the air cleaner is also bit used. But, why am i getting this occasionally? Since this happen ocassionally i think we can put aside the posibilty of a faulty air filter. Can this be a break binding issue connected with my hand break fault that i have explained to you, then why on earth the Check Engine light comes out occasionally...hahaha...

keep on posting on this topic brothers, i have fixed many issues from your valuble comments...

  maersk said:

Funny but I'm sure hyndai doesn't mean it's because of 'yakku & bhuthayo' or similar kind but his car is seriously sluggish sometimes. Sometime back same thing happened to me with my Nissan & diagnosis as faulty MAF sensor.

Best thing is to check the engine using a scanner since your engine check light is also on.

Most important is to select a trustworthy place to do the scanning. Don’t forget there are many dodgy places around us nowadays & they will suggest various unnecessary things together with what need to be done.

I trust my mech who doesn’t even have a scanner but he can diagnose many faults reading error codes manually. When necessary he will direct me to better equipped place after briefing me about possible faults so I have a fairly good idea what to expect.

Good luck & keep us posted.

[Devinda_Z]

  hyndai said:

Is it ok to clean plugs? The current plugs are nearing 30000k. Is this too much runnig for a set of spark plugs? Is NGK a good brand? please give me some advices on these. I also think that the air cleaner is also bit used. But, why am i getting this occasionally? Since this happen ocassionally i think we can put aside the posibilty of a faulty air filter. Can this be a break binding issue connected with my hand break fault that i have explained to you, then why on earth the Check Engine light comes out occasionally...hahaha...

keep on posting on this topic brothers, i have fixed many issues from your valuble comments...

NGK is a good brand - OEM suppliers for most auto manufacturers

if its only the steering that wobbles at speed, then could be something to do with the steering rack or related bits..

how long ago was the last time you did a complete service which included change of air & oil filters + lubricants etc?

Check engine light might be triggered by a malfunction detected by a sensor - so could be anything from a TPS , MAF or even the EMS/ECU

[Ripper]

  hyndai said:

Is it ok to clean plugs? The current plugs are nearing 30000k. Is this too much runnig for a set of spark plugs? Is NGK a good brand? please give me some advices on these. I also think that the air cleaner is also bit used. But, why am i getting this occasionally? Since this happen ocassionally i think we can put aside the posibilty of a faulty air filter. Can this be a break binding issue connected with my hand break fault that i have explained to you, then why on earth the Check Engine light comes out occasionally...hahaha...

keep on posting on this topic brothers, i have fixed many issues from your valuble comments...

30,000k should be ok me thinks providing that the engine doesn't have other issues like low-compression, oil leaks etc etc that can ruin plugs faster...

Like mr.Z has already said NGK is a pretty good brand... Some prefer to use that and others like Denso cos some vehicles use it as OEM replacement.

I was advised to change the air filter every oil change but was told to use a cheaper non-branded product. Always better to keep a clean air filter cos without proper breathing the engine wont be that efficient.

Another option might be to buy a re-usable K&N high flow air filter that will last you a few years and with some performance gains

Since you said the break binding issue was settled i doubt it has anything to do with this...

Check engine light can be for many things and the only way to properly identify the issue is to hook the car upto a diagnosis comp...

[The Don]

  hyndai said:

Is it ok to clean plugs? The current plugs are nearing 30000k. Is this too much runnig for a set of spark plugs? Is NGK a good brand? please give me some advices on these. I also think that the air cleaner is also bit used. But, why am i getting this occasionally? Since this happen ocassionally i think we can put aside the posibilty of a faulty air filter. Can this be a break binding issue connected with my hand break fault that i have explained to you, then why on earth the Check Engine light comes out occasionally...hahaha...

keep on posting on this topic brothers, i have fixed many issues from your valuble comments...

I think its basically time for you to do a full service, which is sometimes referred to as a tune up ! clean your throttle body, MAF sensor and check your steering and suspension. I'm surprised they didn't pick up any problems when you got your wheels aligned.

I have a feeling once you've replaced the plugs, the filters and cleaned the throttle body and injectors and checked things like the ignition timing, the plug wires and the ignition system the problem might go away. If not it is probably the MAF or the oxygen sensor on the exhaust manifold. (In my experience the after CAT oxygen sensor does not trigger the check engine light)

[maersk]

  hyndai said:

Is it ok to clean plugs? The current plugs are nearing 30000k. Is this too much runnig for a set of spark plugs? Is NGK a good brand? please give me some advices on these. I also think that the air cleaner is also bit used. But, why am i getting this occasionally? Since this happen ocassionally i think we can put aside the posibilty of a faulty air filter. Can this be a break binding issue connected with my hand break fault that i have explained to you, then why on earth the Check Engine light comes out occasionally...hahaha...

keep on posting on this topic brothers, i have fixed many issues from your valuble comments...

Assuming your spark plugs are normal type I would say 30000 is too much already. If I'm not mistaken standard is 20000 kms but on our congested roads better change early. I usually change them around 12-15k. Iridium & platinum plugs are expensive but last much longer. Standard is 100k but I've experienced deteriorate Iridium plugs @ 60k.

Yes you can clean plugs to a certain extent but remember they are a wearable items & after 30000 kms on them better change.

Air cleaners are not expensive (+/- 1k depends on part #, VIC) & it's a good habit to keep the air filter clean & changed iwhen required. In our road conditions they clogged with some sticky oily stuff (exhaust from other vehicles) + dust very quickly.

NGK, Denso, Champion, Bosh all good brands when it comes to spark plugs.

I don't think its spark plugs alone giving you trouble so why don't you get your engine checked ASAP. Honestly I don't think anyone can give you a proper answer to all your questions without inspection.

Edited January 20, 2009 by maersk

[Devinda_Z]

  The Don said:

(In my experience the after CAT oxygen sensor does not trigger the check engine light)

but rather the exhaust light

Edited January 20, 2009 by Devinda_Z

[hyndai]

Thank you all for the responses, please post keep on posting any suggestion that you think will help me.

I ll start with spark plugs and air cleaner..will keep you all posted on this matter.

thank u all.

[hyndai]

Devinda;

i do all the changes you have mentioned in 5000km intervals, is it too much? by the way the car is in Galle and only in week ends its been used, so 5000 km means in some cases 7 to 8 months.

[The Don]

  hyndai said:

Devinda;

i do all the changes you have mentioned in 5000km intervals, is it too much? by the way the car is in Galle and only in week ends its been used, so 5000 km means in some cases 7 to 8 months.

It should be around 5000k or every 6 months I would think, at least in SL.

[Mean Green z28]

just to add some humor, STOP DRIVING SO FAST and it'll all be okay

[JadeyBlitzen]

lol good one mate! i'm guessing one of the wheels is out of balance. cos if its the engine it'll always vibrate at that engine speed. i've experienced this in other vehicles. with badly repaired or out of balance tyres you tend to get a huge wobble at high speeds. as for the engine i'll leave that to the experts.

[Devinda_Z]

  JadeyBlitzen said:

i'm guessing one of the wheels is out of balance.

worse still, one of the front wheels might have buckled!

but in such a case the wobble (or at the very least a hum) would be noticable at low speeds as well..

[JadeyBlitzen]

  Devinda_Z said:

worse still, one of the front wheels might have buckled!

but in such a case the wobble (or at the very least a hum) would be noticable at low speeds as well..

i think it depends on how wobbly the wheel is and how much you can notice the differences in your cars ride. with tall tires and not so smooth roads its hardly noticable until you reach high speeds and its usually accompanied by a hum. just because you get the vibrations through the steering it cant mean its only the front wheels that are affected.

[Elvis_Pil]

Can't be the wheels- the problem would be more pronounced if it was and it would have been detected when he did the alignment. It could be fuel related- check your fuel pump/filter

[niro123]

  Elvis_Pil said:

Can't be the wheels- the problem would be more pronounced if it was and it would have been detected when he did the alignment. It could be fuel related- check your fuel pump/filter

CV joints, get them checked, the wobble comes due to a slight play in the ( how can i say this -) the CV joint consists of a shaft that rotates which are suspended by metal( i think) balls, In due time these balls degrade and tend to move away from their original place at high speeds ( they wear off) so just get them checked, see if you get a strange noise when you have shap bends or ( doing a U turn).

Just a thought, not sure though

[hyndai]

Found a fault in stearing rack, felt a small crack like feeling when turning the vehicle. now the car is in garage, will see what will happen..and they also detected a faulty balancing bar or some thing....some rubber bushes were bad. gonna replace them. bad thing about garages in galle is they return the car with lots of rats, last time they ate my electronic system, wonder what gonn be this time..

thank you for your responces

will post the latest nwes soon

[Dinel Silva]

what was the issue ?