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Car Forum / Ford / Ford Mustang / January 2005Knock at 62,000 miles on 01 GT
Has anyone notice engine knock at higher revs and strain on there 4.6L engine at about 62,000 miles? Does this just mean that I need to change my spark plugs? (Still original plugs) "john.moyer" <john.moyer@insightbb.com> done said: > Has anyone notice engine knock at higher revs and strain on there 4.6L > engine at about 62,000 miles? Does this just mean that I need to change my > spark plugs? (Still original plugs) No knocking here, and my '01 GT has 72K with original plugs. - Max - ======= In the future, everyone will be hyperlinked for fifteen minutes. http://hometown.aol.com/maxx2112/ Just Say No to 6:5 Blackjack! http://www.cafepress.com/justsaynoto6to5/ No clue. My 01GT only has 35K on it! > "john.moyer" <john.moyer@insightbb.com> done said: > [quoted text clipped - 12 lines] > Just Say No to 6:5 Blackjack! > http://www.cafepress.com/justsaynoto6to5/ Sounds like you need at least three professional opinions.... That there is a "knock" should be worrisome.... however, different problems add different personalities to engine noises and these cannot be accurately put into print. Double raps, single raps, muffled raps, sharp raps... on accelleration, decelleration, float.... top end, bottom end, front back, left side, right side.... Sorry, John, its just not that simple... > Has anyone notice engine knock at higher revs and strain on there 4.6L > engine at about 62,000 miles? Does this just mean that I need to change my > spark plugs? (Still original plugs) >Has anyone notice engine knock at higher revs and strain on there 4.6L >engine at about 62,000 miles? Does this just mean that I need to change my >spark plugs? (Still original plugs) unlikely. Many things could cause this. Start simple; replace fuelfilter, clean the intake sensors. Remove NO-SPAM from email address when replying If I drive normally and wind out the gears under normal acceleration I don't get the knock. It's when I get the revs up over 4000 and really get on it. This is also when the engine has had time to warm up. I used to get knock when the engine was cold, but I had taken it to the dealer for a bad air bypass valve at about $30,000, and the dealer said that that they re-flashed an update to the ECM and I never notice the cold engine knock after that. If anyone gets a chance and has similar miles and has never changed their plugs, do me a favor. When you are on a highway and going about 60, downshift to 3rd and floor it. Any knock??? Thank you for the replies, John > Has anyone notice engine knock at higher revs and strain on there 4.6L > engine at about 62,000 miles? Does this just mean that I need to change my > spark plugs? (Still original plugs) > Has anyone notice engine knock at higher revs and strain on there 4.6L > engine at about 62,000 miles? Does this just mean that I need to change my > spark plugs? (Still original plugs) Is the knock sound like a timing/low octane fuel knock? Do those cars still have distributors? If so check your timing. If not, try running a tank of 93 or 94 octane thorugh it (or whatever your highest octane pump gas is) and see if it makes a difference. These days auto makers often run timing right on the edge of knocking through the use of knock sensors. Could be something it out of whack, maybe the knock sensor isn't working right or something has changed messing up the computer's caculations. Running higher octane fuel could compensate enough to stop the knocking. Of course if the knock isn't a timing or fuel octane type of knock you can disregard all this. >> Has anyone notice engine knock at higher revs and strain on there 4.6L >> engine at about 62,000 miles? Does this just mean that I need to change [quoted text clipped - 3 lines] >Is the knock sound like a timing/low octane fuel knock? Do those cars still >have distributors? If so check your timing. If not, try running a tank of 93 Not since the 96gt >or 94 octane thorugh it (or whatever your highest octane pump gas is) and why ? Higher octane doesn't clean an engine. It should run fine on 87. >see if it makes a difference. These days auto makers often run timing right >on the edge of knocking through the use of knock sensors. Could be something Mustang GT doesn't have knock sensors. >it out of whack, maybe the knock sensor isn't working right or something has >changed messing up the computer's caculations. Running higher octane fuel >could compensate enough to stop the knocking. Of course if the knock isn't a It's just hiding (if even) a problem. Don't do it. >timing or fuel octane type of knock you can disregard all this. Remove NO-SPAM from email address when replying > >> Has anyone notice engine knock at higher revs and strain on there 4.6L > >> engine at about 62,000 miles? Does this just mean that I need to change [quoted text clipped - 9 lines] > > why ? Higher octane doesn't clean an engine. It should run fine on 87. I never said anything about cleaning an engine. I would assume at only 62,000 miles it's still pretty clean. Regardless, if you're gonna clean an engine the only way to do it properly (and the onyl way worth doing) is to take it apart. It sounds to me like there is a good chance the timing may be too far advanced. Whatever the reason may be, running the highest octane fuel available will help to rule that out. If it still makes the same noise with no improvement on 94 octane, then it's most likely not a timing related issue. > >see if it makes a difference. These days auto makers often run timing right > >on the edge of knocking through the use of knock sensors. Could be something > > Mustang GT doesn't have knock sensors. I don't like computers in cars, and I don't know a whole lot about particular models on new cars. They just plain don't interest me. > >it out of whack, maybe the knock sensor isn't working right or something has > >changed messing up the computer's caculations. Running higher octane fuel > >could compensate enough to stop the knocking. Of course if the knock isn't a > > It's just hiding (if even) a problem. Don't do it. I never said to continue to run higher octane fuel. By running a higher octane fuel it can be determined if the noise is pinging. If it is, the problem (most likely timing, but also possibly a lean mixture, or a handful of other things) then you know that much mroe about it and it will point you in the right direction for a solution. If pinging is not the problem, running 94 octane (or wahtever the highest pump gas is in the OPs location) is a cheap way to rule out pinging as the problem. So buddy, I don't know what you've got shoved up your a.s, but it seems that most Mustang groups with any of the late model stuff have a sizeable amount of know-it-alls like you who are on a hair-trigger to bash anyone who comes along. That's why I normally keep to FordMuscle... Great friendly environment with a _LOT_ of knowledgeable people, who also happen to respect eachother. I suppose it would be ludicrous to expect the same level of respect on Usenet... |
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