Anyone experience pinging/knocking w/ 05's?
Anyone experience pinging/knocking w/ 05's?
My 05 6MT coupe is now broken in. I got on it some in 1st gear up to about 4500 RPM's about a month ago and heard some strange noises but thought it was my imagination. So tonight, I got on the car some, 1st and 2nd up to about 6500 RPM's. In 1st, the motor sounded like it was knocking some but didn't really sound like it in 2nd. Its very strange. I only run 91 octane (highest around here except race gas) from either Shell or Chevron. Has anyone with an 05 or any other year experienced anything else like this? The car has a drop in K&N, Z-tube, 3/8" MD spacer, and ground wires. The car did this when it only had a K&N too. I really don't want to have to take it to the dealer, but if I have to, I will. 
If it's really knocking, then perhaps the K&N has deposited oil residue in the intake tract and is confusing the MAF? Other than that, I'd say switch gas stations and/or use some octane booster to see if that solves it.
Eliminate the easiest things first.
Eliminate the easiest things first.
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Never had a problem with knocking. Using 93 octane from day 1. I don't visit redline often but have been up there enough to knock if I was gonna. I'm bone stock except for a really nice microfiber in the trunk. Does that count as a mod? 
I'd say bad gas but you've obviously burned through more than a tank since you've noticed the problem. Same gas station for gas since you discovered it?
I'd say bad gas but you've obviously burned through more than a tank since you've noticed the problem. Same gas station for gas since you discovered it?
I have encountered bad stations. Not sure if they had tanks that would allow ground-water into them or if they were trying to water down the fuel or if they were selling regular as premium.. ...or maybe they just had a terrible supplier, but the point is that there is usually a station or maybe a few in your area that have some bunk stuff. Switch stations, ask others who they use... ...you know, all the easy, free things first. In the meantime, you could also pull your filter and check inside the intake tract for oil residue.
Has your weather been really hot?
In the meantime, you could also pull your filter and check inside the intake tract for oil residue. Has your weather been really hot?
Well, I live in a hot climate (Arizona), so its pretty much hot from May-September. I've gone through at least 4 tanks of gas so far. I really don't think its bad gas. I'm wondering if there are other noises and not necessarily the motor. The strange thing is that it doesn't do it in higher gears 3rd-5th, where it should, if it is pinging since there is a larger load in those gears. I wonder if its a heat shield or something else rattling.. I'll take a look at the K&N later today and see if I come up with anything.
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Nothing at idle? You gotta remember your NA motor is making alot of HP out of a smaller displacement- a few sounds will probably arise here and there, haha. I'd try an octane booster 1st because that will be the 1st inexpensive 'experiment' ranging from $2-$15 a bottle to see what the problem is; if there is one.
A warning about octane boosters though:
Alcohol: Yes. There is a reason Indy cars use this but for your street car that has seen regular fuel thus far this may not be the right type of booster that you should be putting in your tank. Alcohol will bond to any water that may be in your fuel- if you did get a bad batch of gas or if this particular station has had a bad batch and contains some water the alcohol will connect with that and settle at the bottom of your tank. It may not be enough to hurt you...but its still there and I know you won't be using boosters regularly and have enough biuld up and you will probly never notice. Also, this may raise an octane number by around 1/10 for a 13gal tank...
MMT: Products that list this as an ingredient may also be bad for your street car. While, like alcohol, it is added to race fuels it also had the tendency to creat 'hot spots' on the combustion chamber by depositing manganese. This will cause your car to want and need higher octane all the time due to the detonation. It may also clog or harm emissions equipment. This is also very toxic and can cause alot of problems like fouling your sparkplugs....but has been reported to raise an octane number 3-5 and in some cases 8!
Try Gold Eagles 104+ booster. So far it seems to be the best for street cars. It is nontoxic and contains fuel injector cleaners that will help get rid of any hot spots or impurities left behind by other boosters or gases. You won't gain any power with compression but if your looking for less pinging then it should do the trick.
Let us know!
A warning about octane boosters though:
Alcohol: Yes. There is a reason Indy cars use this but for your street car that has seen regular fuel thus far this may not be the right type of booster that you should be putting in your tank. Alcohol will bond to any water that may be in your fuel- if you did get a bad batch of gas or if this particular station has had a bad batch and contains some water the alcohol will connect with that and settle at the bottom of your tank. It may not be enough to hurt you...but its still there and I know you won't be using boosters regularly and have enough biuld up and you will probly never notice. Also, this may raise an octane number by around 1/10 for a 13gal tank...
MMT: Products that list this as an ingredient may also be bad for your street car. While, like alcohol, it is added to race fuels it also had the tendency to creat 'hot spots' on the combustion chamber by depositing manganese. This will cause your car to want and need higher octane all the time due to the detonation. It may also clog or harm emissions equipment. This is also very toxic and can cause alot of problems like fouling your sparkplugs....but has been reported to raise an octane number 3-5 and in some cases 8!
Try Gold Eagles 104+ booster. So far it seems to be the best for street cars. It is nontoxic and contains fuel injector cleaners that will help get rid of any hot spots or impurities left behind by other boosters or gases. You won't gain any power with compression but if your looking for less pinging then it should do the trick.
Let us know!
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if you have a local pump that sells 100, put about 3 or 4 gallons of that in the tank and see if it still sounds like knocking. it's not going to be as costly as it sounds, since you're going to need 3 or 4 gallons less of 91 octane. it's about the cost of a bottle of octane booster and much more effective... remember, "1 point" on an octane booster is .1 octane.
i highly doubt it's detonation... for a 3.5l it's not making extreme ammounts of horesepower and factories always tune for worst case scenarios (high heat, less than ideal gas, etc...) maybe maybe maybe if you had an intake with a different size housing for the MAF sensor you would need to worry about knock.
i highly doubt it's detonation... for a 3.5l it's not making extreme ammounts of horesepower and factories always tune for worst case scenarios (high heat, less than ideal gas, etc...) maybe maybe maybe if you had an intake with a different size housing for the MAF sensor you would need to worry about knock.
Unfortunately, octane boosters don't work worth a damn. Most of the time they can do more damage than good. I have close to a full tank, so I will have to wait a bit to try the 100 octane, but it might be worth a try. Toluene might be worth a try though.
I have had a lot of experiences with octanes and such in the past. I had a 12.0+:1 compression ratio 4 cylinder Honda and also a turboed 10.5:1 c/r motor in 110+ degree heat.
I have had a lot of experiences with octanes and such in the past. I had a 12.0+:1 compression ratio 4 cylinder Honda and also a turboed 10.5:1 c/r motor in 110+ degree heat.
Last edited by AzSi22; Jun 2, 2005 at 04:21 PM.
Originally Posted by AzSi22
Unfortunately, octane boosters don't work worth a damn. Most of the time they can do more damage than good. I have close to a full tank, so I will have to wait a bit to try the 100 octane, but it might be worth a try. Toluene might be worth a try though.
I have had a lot of experiences with octanes and such in the past. I had a 12.0+:1 compression ratio 4 cylinder Honda and also a turboed 10.5:1 c/r motor in 110+ degree heat.
I have had a lot of experiences with octanes and such in the past. I had a 12.0+:1 compression ratio 4 cylinder Honda and also a turboed 10.5:1 c/r motor in 110+ degree heat.
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