rough idle...intake manifold issue?
08-17-2007, 01:12 PM
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rough idle...intake manifold issue?
i have a 2004 rx8 with over 60k miles and the greddy turbo kit
after one day of lots and lots of high rpm driving and heat my 8 started to rumble and sputter. it had no power wat so ever and it felt like it wanted to die. it was real hard on starting after that.
we immediately checked everything that we could think of
we thought it was a vacuum hose but after further investigation we found nothing
after over a month of nothing we decided to order a new intake manifold from pettit racing to replace the stock plastic one (im still confused on y it is plastic in the first place)
if anyone else has had this problem and kno a solution plz help
after one day of lots and lots of high rpm driving and heat my 8 started to rumble and sputter. it had no power wat so ever and it felt like it wanted to die. it was real hard on starting after that.
we immediately checked everything that we could think of
we thought it was a vacuum hose but after further investigation we found nothing
after over a month of nothing we decided to order a new intake manifold from pettit racing to replace the stock plastic one (im still confused on y it is plastic in the first place)
if anyone else has had this problem and kno a solution plz help
08-17-2007, 01:56 PM
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we checked all the vacuum hoses to see if they broke or slipped off, spark plugs, then we went to the manifold
im not as informed on cars as you apparently. wen i say we i meant me and my mechanic so i dnt kno wat u mean wen u say EMS or AFR
08-17-2007, 02:05 PM
#7
RotoRocks Powered
i have the complete stock exhaust
we checked all the vacuum hoses to see if they broke or slipped off, spark plugs, then we went to the manifold
im not as informed on cars as you apparently. wen i say we i meant me and my mechanic so i dnt kno wat u mean wen u say EMS or AFR
we checked all the vacuum hoses to see if they broke or slipped off, spark plugs, then we went to the manifold
im not as informed on cars as you apparently. wen i say we i meant me and my mechanic so i dnt kno wat u mean wen u say EMS or AFR
AFR - Air Fuel Ratio. Do you have a gauge that reads it?
EMS - Engine Management System.
You might want to consult with your mechanic on the above items.
Also, if you have stock exhaust, most likely an intensive high RPM day fried your cat.
it is quite common on turboed cars.
The quickest way to test if it is in fact that, is to bang real hard on your cat. If you hear rattle coming from it, then you don't have much to worry about. Either have your mechanic take it our and gut it, or replace it, or put in a mid pipe.
08-21-2007, 02:24 AM
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I am not being critical. Just need info to try and help.
AFR - Air Fuel Ratio. Do you have a gauge that reads it?
EMS - Engine Management System.
You might want to consult with your mechanic on the above items.
Also, if you have stock exhaust, most likely an intensive high RPM day fried your cat.
it is quite common on turboed cars.
The quickest way to test if it is in fact that, is to bang real hard on your cat. If you hear rattle coming from it, then you don't have much to worry about. Either have your mechanic take it our and gut it, or replace it, or put in a mid pipe.
AFR - Air Fuel Ratio. Do you have a gauge that reads it?
EMS - Engine Management System.
You might want to consult with your mechanic on the above items.
Also, if you have stock exhaust, most likely an intensive high RPM day fried your cat.
it is quite common on turboed cars.
The quickest way to test if it is in fact that, is to bang real hard on your cat. If you hear rattle coming from it, then you don't have much to worry about. Either have your mechanic take it our and gut it, or replace it, or put in a mid pipe.
i dnt have an air fuel ratio gauge but my mech did reccomend it
also..and im rly sry...i forgot to mention that you could hear a sort of vacuum sound coming fron the upper manifold area
08-21-2007, 08:17 AM
#9
RotoRocks Powered
You still did.t tell me anything.
damage to the manifold is something I haven't heard before. Has anyone?
Before you get to testing the extremes, make sure all the simple stuff is taken care of. Make sure all your hoses are connected to the intake pipe.
the sound may be coming from the OMP hose. It sucks in a lot of air when the engine is running making loud whistling noise. You don't hear it when it is connected into the intake, but if it is left loose in the hood (must be filtered by a breather or something in this case) it will make loud hissing noise. it is no big deal though.
Did you test your cat for rattles? Also check your coils and spark plugs, test the compression.
If the cat is rattling, have your mechanic take it down, and drive a steel rod through it to clear out the remains of the catalytic and shake it out (wear a mask dont's breathe in that stuff). Then reinstall it and see if that improves things.
damage to the manifold is something I haven't heard before. Has anyone?
Before you get to testing the extremes, make sure all the simple stuff is taken care of. Make sure all your hoses are connected to the intake pipe.
the sound may be coming from the OMP hose. It sucks in a lot of air when the engine is running making loud whistling noise. You don't hear it when it is connected into the intake, but if it is left loose in the hood (must be filtered by a breather or something in this case) it will make loud hissing noise. it is no big deal though.
Did you test your cat for rattles? Also check your coils and spark plugs, test the compression.
If the cat is rattling, have your mechanic take it down, and drive a steel rod through it to clear out the remains of the catalytic and shake it out (wear a mask dont's breathe in that stuff). Then reinstall it and see if that improves things.
Last edited by rotorocks; 08-21-2007 at 08:20 AM.
08-21-2007, 12:55 PM
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You still did.t tell me anything.
damage to the manifold is something I haven't heard before. Has anyone?
Before you get to testing the extremes, make sure all the simple stuff is taken care of. Make sure all your hoses are connected to the intake pipe.
the sound may be coming from the OMP hose. It sucks in a lot of air when the engine is running making loud whistling noise. You don't hear it when it is connected into the intake, but if it is left loose in the hood (must be filtered by a breather or something in this case) it will make loud hissing noise. it is no big deal though.
Did you test your cat for rattles? Also check your coils and spark plugs, test the compression.
If the cat is rattling, have your mechanic take it down, and drive a steel rod through it to clear out the remains of the catalytic and shake it out (wear a mask dont's breathe in that stuff). Then reinstall it and see if that improves things.
damage to the manifold is something I haven't heard before. Has anyone?
Before you get to testing the extremes, make sure all the simple stuff is taken care of. Make sure all your hoses are connected to the intake pipe.
the sound may be coming from the OMP hose. It sucks in a lot of air when the engine is running making loud whistling noise. You don't hear it when it is connected into the intake, but if it is left loose in the hood (must be filtered by a breather or something in this case) it will make loud hissing noise. it is no big deal though.
Did you test your cat for rattles? Also check your coils and spark plugs, test the compression.
If the cat is rattling, have your mechanic take it down, and drive a steel rod through it to clear out the remains of the catalytic and shake it out (wear a mask dont's breathe in that stuff). Then reinstall it and see if that improves things.
ok my mechanic has been working with pettit racing (over the phone of course) once my mech told the guys there the deal with my car....completely stock except for the greddy turbo kit...stock exhaust stock plastic intake manifold....he said that the plastic manifold could easily be the culprit. your cat idea could very well be the problem but tht doesnt explain the sound coming from under the hood. if you heard it yourself you would say the same thing that the sound was coming frm the intake manifold area, more specifically around the oil cap..
and my mechanic looked for any problems with and loose hoses or anything like that and he said tht he didnt find anything wrong like tht...?
08-21-2007, 03:01 PM
#12
RotoRocks Powered
You symptoms sound exactly as what I had experienced when my cat went.
the car stopped making power, and wanted to die. if you had an EGT you'd possibly be seeing very high temperatures when cruising and your AF ratios would be going high wire.
Check the cat. It will not cost you much (compare to a new manifold) and may well solve the problem.
Unless your manifold had some sort of damage originally there is a very slim chance it would have cracked from the boost that Greddy makes.
Last edited by rotorocks; 08-21-2007 at 03:05 PM.
08-22-2007, 01:33 PM
#17
I'm just talking about the "O" rings. I'm not sure what you are alluding to.
I've had a half dozen manifolds go through my hands over the last few years and the design hasn't changed.
An o-ring won't leave this manifold unless it is installed incorrectly.
I've had a half dozen manifolds go through my hands over the last few years and the design hasn't changed.
An o-ring won't leave this manifold unless it is installed incorrectly.
08-22-2007, 10:33 PM
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I would do a compression test first. If that pass, I would check for a clogged catalytic by removing it and start the car. If that doesn't work, then intake manifold.
BTW MM, you can PM the after pics
BTW MM, you can PM the after pics
08-31-2007, 10:21 AM
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ok the verdict is in!
turns out tht the problem was in fact the intake manifold
with the new manifold from pettit racing it runs great
thx to all who offered a word of help
turns out tht the problem was in fact the intake manifold
with the new manifold from pettit racing it runs great
thx to all who offered a word of help
