Car Shudders above 3k rpm.

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theVash
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Car Shudders above 3k rpm.

Post by theVash » Tue Apr 18, 2006 3:18 am

Hellos.
Everything has been fine and dandy with my car over the last 6 months or so. But now it shudders when ever I rev it above 3k rpm.

Its a 92 VR4. About 117k miles.
Oil has been changed in last 600 miles or so.
Never seem to have any other problems before.

Any ideas what might be going on?
I don't treat it bad, actually I drive really slow. :(

Thanks.

theVash
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curt_gendron
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Post by curt_gendron » Tue Apr 18, 2006 3:32 am

Kind of sounds like a problem with spark. When was the last time plugs and wires were changed. Does it shudder under boost at 3k rpm? What about if you just easy it over 3k rpm where you really don't build any boost.

later,
Curt
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Post by theVash » Tue Apr 18, 2006 4:28 am

Might be. I have not changed the plugs, and I don't know how long ago they were changed.

It shudders all the time above 3k or so. If I push the petal down real fat it shudders but if I ease it down it does the same.

Thanks for the info, I guess I might be in for new plugs very soon.
What would you recomend?

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Post by apickle » Tue Apr 18, 2006 5:12 am

I've been using the NGK Coppers, #5553 BKR6ES. You'll want to change them more often than platinums, I do mine every spring. Napa sells them for about $12 for 6. Otherwise try the stock Platinums, they're more expensive but should go 40-60k miles (depending on mods).
1992 3000GT VR4 || 2005 Subaru Legacy 2.5GT || 2003 Suzuki SV650s

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Post by curt_gendron » Tue Apr 18, 2006 1:42 pm

theVash wrote:Thanks for the info, I guess I might be in for new plugs very soon.
What would you recomend?
Use the stock platinum plugs, NGK PFR6J11.
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Post by BluDevl » Tue Apr 18, 2006 2:25 pm

What would be the best plugs for performance?? I was thinking on getting some of the NGK iridiums, would they be better, or should you just stick to the stock plugs

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Post by curt_gendron » Tue Apr 18, 2006 2:34 pm

92N/A3Thou wrote:What would be the best plugs for performance?? I was thinking on getting some of the NGK iridiums, would they be better, or should you just stick to the stock plugs
For a non-turbo, just get the stock platinums. If you were a twin turbo running on the ragged edge, then coppers or iridiums would be a good choice.

later,
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Post by stealthtwinturbo » Tue Apr 18, 2006 5:37 pm

92N/A3Thou wrote:What would be the best plugs for performance?? I was thinking on getting some of the NGK iridiums, would they be better, or should you just stick to the stock plugs
Do not listen to claims about "better performance" from plugs or wires. If your stock plugs and wires are good, you will not/can not get better performance from plugs.

For example, I'm running stock wires, stock coils and NGK "old school" copper plugs. Now I am running 3 temp range colder (and gapped to .025) because of 30+PSI boost, but nothing fancy (special tips, more electrodes, etc).

I'd recommend stock plugs for your application. The plats work very well and will last you a long time.

Mark
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Best ET [email protected]

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Post by theVash » Wed Apr 26, 2006 10:05 pm

Ok, so I started to save up money to get some plugs, and the shuddering went away.
Making me even more scared.

So I guess what I need to know is where I can take the car to get the plugs replaced for a decent price.
Between my father and I, I think we could do it, but it would be a very long journy. And one that does not sound to fun. :(

thanks for the advice. :)

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Post by Turbo_StealthRT » Wed Apr 26, 2006 10:24 pm

If you have a ratchet and socket set, then you can handle a spark plug change. I think there is a good write-up on http://www.stealth316.com. If you are going very slowly, it shouldn't take you more than a few hours. Just be sure not to cross thread the spark plugs and don't drop anything down the intake manifold.

If you want someone to do the work for you, I'd give LSE a call or PM.

Brad
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Post by theVash » Wed Apr 26, 2006 10:40 pm

Thank you, after looking at a walk thought, I think we will try it.
Thanks.

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Post by veerfour05 » Wed Apr 26, 2006 10:42 pm

It's more intimidating then it actually is, just make sure to let the motor cool down first for 2 reasons, 1st you don't want to damage the threads, 2nd, picking up the plenum when it's hot hurts
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Post by CDeutsch » Thu Apr 27, 2006 2:38 pm

Turbo_StealthRT wrote:and don't drop anything down the intake manifold.
This is a biggy. Be careful. I think Andy P. can vouch for that. :cry:
Christopher
08 997 TT

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Post by apickle » Thu Apr 27, 2006 5:48 pm

Yea, those intake runners like to swallow lock washers :lol:
CDeutsch wrote:
Turbo_StealthRT wrote:and don't drop anything down the intake manifold.
This is a biggy. Be careful. I think Andy P. can vouch for that. :cry:
1992 3000GT VR4 || 2005 Subaru Legacy 2.5GT || 2003 Suzuki SV650s

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Post by mjannusch » Thu Apr 27, 2006 6:05 pm

apickle wrote:Yea, those intake runners like to swallow lock washers :lol:
I don't even put the lockwashers back on anymore...
-Matt
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