汽車專業(yè)英語教程教案

1、Chapter 5 Automobile Reception and Maintenance English第五章 汽車接待與維修實用英語Section 1 Receptionist English第一節(jié) 前臺接待英語Section 2 Maintenance Reception English第二節(jié) 接待英語Section 3 Reading Materials of Automobile Maintenance第三節(jié) 資料選讀Section 4 Reading Materials of Present Automobile Technology第四節(jié) 技術資料選讀Section 1 Rec

2、eptionist English第一節(jié) 前臺接待英語 Lesson One Introduction of New Models 第一課 車款推介 Lesson Two Negotiation of Price 第二課 價格討論 Lesson Three Terms of Payment 第三課 支付方式 Lesson One Introduction of New Models 第一課 車款推介 Dialogue 1 對話1 Dialogue 2 對話2 Dialogue 3 對話3 NEW WORDS AND EXPRESSIONS NOTES A：Now Id like to show

3、 you the new model，2000 Toyota Landcruiser A：現在我向您介紹一款新車，豐田巡洋艦2000。 B：oh，it looks nice B：很漂亮。 A：Yes，I bet youll like it more after my introductionIts Power Steering with Alloy WheelsCruise Control，4 Wheel Drive A：我肯定在聽完我的介紹之后您會更喜歡它。它帶動力轉向的合金車輪，有巡航系統和四輪驅動。 B：Very goodCould you tell me more about the

4、specifications of this model? B：很好。你能告訴我關于這款車更多的特點嗎？ Dialogue 1 對話1 A：SureAs you can see its of sports utility body style with Mahoghany exterior，4.7 Liter V8 engine A：當然。它的發(fā)動機是4.7V8發(fā)動機。正如您所見，這輛車有紅褐色運動型的外殼，非常好看。 B：I like it very muchWhats the price? B：我非常喜歡。它的售價是多少呢? A：49975.00 A：49975.00美元。 B：Any d

5、iscount? B：能打折嗎? A：Yes，We can offer you 50ff A：可以，我們可以給您打9.5折。 B：GoodIll take it B：好的，那我就買吧。 Dialogue 2 對話2 A：This way，Mr.SmithWhat do you think about our new model Audi A6 Quattro? A：請這邊，史密斯先生。你覺得我們的新型號奧迪A6 Quattor如何? B：oh，it looks goodBut Id like to know something about its feature B：看上去不錯。但是我想多了解

6、一些它的特性。 A：Its auto transmission and 4 wheel drive with power brakesLet me tell you more specificationThe Mileage is 14415The engine，4.2 Liter V6The price is 27299.00I think its quite a good car A：這輛車帶有動力制動器的自動變速器和四輪驅動。讓我告訴你更多它的特性：這輛車行駛了14415英里，4.2V6發(fā)動機，售價是27299美元。我覺得這是一輛很好的車。 B：Yes，I think soBut Id

7、like to look around and make a decision after seeing some other models B：是的，我也這么想。但我還是想看看周圍其他的型號然后再下決定。 A：Sure A：好的。 Dialogue 3 對話3 A：Are you interested in our new model?Would you like to know more about it? A：你對我們這款新車有興趣嗎?要多了解一下嗎? B：Yes，I wouldBut does it have Anti-Lock Brakes and Auto Transmission

8、? B：好的。它有防抱死剎車裝置和自動變速器嗎? A：Yes，of courseAnd also with the other features such as Dual Air Bage，Tilt Wheel and Power Locks Etc. A：當然有。而且還有其他的特性，如雙層氣囊、可調式車輪和驅動力差速鎖等。 B：PerfectI love itthink Ill take this one B：太好了，我很喜歡。我想買這輛。 A：Thank you A：謝謝。 NEW WORDS AND EXPRESSIONS： NOTES： Lesson Two Negotiation o

9、f Price 第二課 價格討論 Dialogue 1 對話1 Dialogue 2 對話2 Dialogue 3 對話3 Dialogue 4 對話4 NEW WORDS AND EXPRESSIONS NOTES Dialogue 1 對話1 A：How much is this new model 675？ A：這款新的675多少錢? B：Its 465,000 Yuan B：465000元。 A：I like this car very much but its bit expensive for meCan you give me discotmt? A：噢。我很喜歡這輛車，但價錢有

10、點貴，能打折嗎? B：Well，this is the newest model and very popularI think its worth B：這是最新的款式，而且非常受歡迎，我覺得這個價格很合理。 A：Ok，Ill think about it A：好吧。我再考慮一下。 Dialogue 2 對話2 A：You could save a lot if you would order a little mole A：如果你多定一點可以省不少的錢。 B：How could we do that? B：怎么說呢? A：We offer a discount for large order

11、s A：我們對大量訂購有折扣。 B：Let me take another look at our requirements B：那我得看看我們的需要量了。 Dialogue 3 對話3 A：We can offer a 10discount for orders over 10 000 pieces A：訂購10000個以上，我們可以打九折。 B：Im not sure we can use that many B：我怕我們用不了那么多。 A：It would represent quite a savings A：這省下的可是一筆不少的錢哩。 B：ok，Ill see what I Can

12、 do B：好吧，我考慮考慮吧。 Dialogue 4 對話4 A：Why are there three prices quoted for this part? A：這種零件為什么有3種不同的報價? B：They represent the prices for different quantities B：不同的量有不同的價錢。 A：I see A：原來如此。 B：The more you order，the more you wilt save B：訂購越多，優(yōu)惠越多。 NEW WORDS AND EXPRESSIONS： NOTES： Lesson Three Terms of Pa

13、yment 第三課 支付方式 Dialogue 1 對話1 Dialogue 2 對話2 Dialogue 3 對話3 NEW WORDS AND EXPRESSIONS NOTES Dialogue 1 對話1 A：Lets discuss the terms of payment A：我們談一下支付方式吧。 B：Well，do you accept credit cards or I should pay in cash？ B：好的。你們接受信用卡付款還是現金？ A：Yes，either is OKAnd you can pay by installmentThe first instal

14、lment should be paid a week beforethe shipmentThe second one would be paid 1 day before the shipmentThen pay the last installment when you get the car A：當然，兩種方式都可以。您還可以采取分三期付款方式：第一期在汽車運送之前1星期，第二次于運送前1天，最后，在收到車后付清其余的款項。 B：Thats very good B：好的 Dialogue 2 對話2 A：Ive one proposal to make on the mode of p

15、ayment A：對于我們的支付方式，我有一個建議。 B ：Whats it？ B：什么建議？ A：Our business is concluded by way of L/CFrankly speaking，a letter of credit will raise the costs of my goodsI heard you would accept different kinds of payments A：我們的交易是用信用證支付的，也就是說這會增加我的貨物成本，我聽說有其他的方式支付。 B：Thats trueBut we cant do itPayment by L/C is

16、 our usual practice of doing business B：是的。不過我們不能這么做。信用證支付是我們一向做生意的慣例。 A：Would you consider another way of payment？Otherwise I would probably stop the business A：那你考慮一下吧。否則我要考慮終止和你的交易了。 B：OKIll think about that and talk to you later B：那好，我考慮后再和你聯系。 Dialogue 3 對話3 A：Im glad our business is going quit

17、e smoothly A：很高興我們的生意進行地如此順利。 B：YesBut is it OK I pay by Bankers Transfer？ B：是啊。我能通過銀行匯款付款嗎？ A：Sony，Im afraid notWe accept payments in cash or by credit card only A：不好意思，恐怕不行。我們只接受現金和信用卡付款。 B：Oh，I dont think I have enough cash with me and I have no credit card B：噢，我現在沒有足夠的現金，而且也沒有信用卡。 A：We have inst

18、allment payment that can help youThe down payment is 1/3 of the price A：那可以采用分期付款方式。您只要先付1/3的訂金就行。 B：Thats greatIll pay the down payment now B：太好了。那我現在就付訂金。 NEW WORDS AND EXPRESSIONS： NOTES：Section 2 Maintenance Reception English第二節(jié) 汽車維修接待英語 Lesson One Reply for Customers Complain 第一課 接受顧客投訴 Lesson

19、Two Visiting Maintenance 第二課 登門維修 Lesson Three Users Feedback 第三課 用戶反饋 Lesson One Reply for Customers Complain 第一課 接受顧客投訴 Dialogue NEW WORDS AND EXPRESSIONS NOTES Dialogue 對話 Manager：Hello，This is Sales Department，New Century Automobile Company 您好，新世紀汽車公司銷售部。 Customer：Im afraid I have to make a comp

20、laint with your corporationIts a most unpleasant incident 我得向你公司提出投訴，這并不是一件令人高興的事情。 Manager：Oh，what is it about?Im so sorry to hear that 什么事?真遺憾聽到此事。 Customer：Yes，I ordered a set of wheel alignment the other day1 received and after I examined them one by one，I found that there must be something wron

21、g with the related cornputer because it cant give any signalThats。why 1 want to see the manager 確實是這樣的，前幾天我訂購了一套四輪定位儀，等我收到后逐個檢查時，我發(fā)現配套的計算機屏幕一點信號都沒有。這就是我要見經理的原因。 Manager：I am sure everything is a11 right with that shipmentYou see I know youre our regular customer and it is the first time for me to me

22、et with such an inconvenient thing 我肯定那批貨的裝運一切都是正常的。我們是老交易了，這你是知道的，我也是第一次遇到這類問題。 Customer：1 want t0 return this 我要退貨。 Manager：Without sufficient evidence to support，your claim is untenableIf we were at fault。we should be very glad to compensate for your loss 你必須有足夠的證據。如果責任在我方，我們當然樂意賠償你方損失。 Customer：

23、Whats your opinion? 您的意見如何? Manager：Im terribly sorry about thatMay I know your name and address，sir?Ill check it and send a repairman to your side at once 真的很抱歉，請問您的姓名及地址，等我核實后，我會立即派修理工去你那里處理此事。 Customer：This is Edward Johnson，from No120，Rose Avenue 我叫愛德華約翰森，露絲大街120號。 NEW WORDS AND EXPRESSIONS： NOT

24、ES： NOTES： Lesson Two Visiting Maintenance 第二課 登門維修 Dialogue NEW WORDS AND EXPRESSIONS NOTES Dialogue 對話 Customer：Youve finally arrived 你們終于來了。 Repairman：Whats the matter? 什么問題? Customer：I think something must be wrong with the computer for wheel alignment because there is no signal on the screen 我想

25、四輪定位儀的計算機一定出了故障，因為屏幕上沒有任何信號。 Repairman：Oh，the engine went dead 發(fā)動機不轉了。 Repairman：Were s0 sorry t0 have caused you so much inconvenience and we have to replace itLet me have a look at your warranty certificate? 對不起，給您帶來了諸多不便，我們得更換它?？梢钥匆幌履谋Ｐ迒螁? Customer：Here it i s 給你。 Repairman：Well，your warranty is

26、 expiredWe have to charge for the parts 哦，抱歉您的保修期已過，所更換的配件需要付款。 Customer：Thats all right，Were dying for the normal work condition at any expense 沒有關系，只要能修好就行。 Several minutes later，The repairman replaced the wrong unit 幾分鐘后，修理工更換了壞的部件。 Repairman：Its OK，you can turn on the power now 好了，您可以開機了。 Custom

27、er：I appreciate your coming here in time 感謝你們及時維修。 Repairman：If anything is wrong with your computer，dont hesitate t0 call us a moment and were at your service 如果電腦再出現什么問題，請立刻打電話給我們，我們隨時為您效勞。 Customer：Thank you 謝謝。 Repairman：My pleasure 不客氣。 NEW WORDS AND EXPRESSIONS： NOTES： NOTES： Lesson Three User

28、s Feedback 第三課 用戶反饋 Dialogue NEW WORDS AND EXPRESSIONS NOTES Dialogue 對話 Salesman：Hello，This is New Century Automobile CompanyIm calling to know whether everything has gone well with your computer 您好，這里是新世紀汽車公司。不知您的計算機現在運轉是否正常。 Customer：Thanks a lotIt works excellently after being repaired 非常感謝，維修之后

29、一切正常。 Salesman：Im very happy to hear you say so and I do hope the minor problem didntcause you much inconvenience 很高興聽您這么說，但愿這一小問題沒有給您帶來太多不便。 Customer：Thank you very much for your good serviceIm sure your company will bemaking more money 謝謝你們真誠的服務，我相信貴公司生意會更加紅火。 Salesman：It is always our policy to g

30、ive reliable and satisfactory services to our clientsLets find out what you like by doing a market research and it will give us an indication 給顧客提供優(yōu)質、滿意的服務是我們的宗旨。讓我們做個市場調查吧，我想這將幫助公司成長。 Customer：Ok，I feel the height of the computer is too high that I have t0 operate by standing 我認為電腦的高度太高以致我只能站著操作。 S

31、alesman：Its a good suggestion，1ll report to the manager right now! 這是個很好的建議，我會立即向經理匯報。 Customer：I recommend a pleasant color to match with the houses color 我建議色澤要好看一些，并且與房子的顏色要匹配。 Salesman：Thank you for your warm-hearted replyI feel more optimistic and more confident about our relations in the futur

32、e 謝謝您熱情的回答。我對我們未來的合作更加樂觀和充滿信心。 Customer：Its just my own opinion，Id like you to think it over 這僅僅是我個人的觀點，希望你們能夠再考慮一下。 Salesman：WelI go into it further，and let you know what decision we reach 我們會做深入的調查，并且把我們的決定告訴您。 Customer：I shall be glad to hear from you 我會很樂意聽到你們的決定。 Salesman：Thank you，bye-bye! 謝謝，

33、再見! Customer：See you later 再見 NEW WORDS AND EXPRESSIONS： NOTES： NOTES：Section 3 Reading Materials of Automobile Maintenance 第三節(jié) 汽車維修資料選讀 Lesson One Engine Troubleshooting 第一課 發(fā)動機故障診斷與維修 Lesson Two Fuel Injection Manual 第二課 燃油噴射系統維修手冊 Lesson Three Automobile Testing Equipment 第三課 汽車檢測設備 Lesson One En

34、gine Troubleshooting 第一課 發(fā)動機故障診斷與維修 Engine overheatin 發(fā)動機過熱 Cleaning the Cooling System 冷卻系的清洗 High Oil Consumption 機油消耗過多 LOW Oil Pressure 機油壓力過低 Chassis and Engine Vibration 底盤和發(fā)動機振動 Abnormal Engine Noises and their Causes 發(fā)動機異響及其原因 NEW WORDS AND EXPRKSSIONS： PHRASES Notes on the Text Engine overh

35、eatin 發(fā)動機過熱 There are many conditions of the automobile that result in overheating，and the degree of overheating is indicated by the temperature gauge on the instrument panelSome conditions will cause only a slight change in the recorded temperature， other causes will result in a rapid rise in tempe

36、rature and violent boiling of the coo1ant Still others while causing only a slight increase in recorded temperature，while will be more noticeable in engine performance 汽車在很多工況下都會有發(fā)動機過熱產生，此時的溫度會則在儀表板上的溫度表中顯示。有些工況會引起發(fā)動機溫度的微小變化，而另外工況則會引起發(fā)動機溫度迅速上升并使得冷卻水劇烈沸騰。同時也有些工況會對發(fā)動機溫度上升稍有影響，但對發(fā)動機性能影響會更顯著。 When troub

37、leshooting the cause for overheating and consequent 1oss of Coolant，the 6rst step is to make careful visual inspection to see if there is any evidence of external 1eakage A1l surfaces of the radiator and its hose connections should be carefully inspectedLeaks generally cause corrosion，which is easil

38、y seenThe Visual inspection also must include the cooling fan and its drive beltIt is not too unusual for cracks to form in the engine water jacketWhen cracks occur，the condition is usually indicated by extreme overheatingThe crack is often difficult to locate，because it is not always visible to the

39、 naked eyeThe condition is also complicated by the fact that the crack usually will close when the engine is cold，and open only when the engine is at operating temperature 當要查找引起發(fā)動機過熱和隨之而來的冷卻水喪失的原因時，首先要進行仔細的外觀檢查，確保是否有外部泄漏問題。對散熱器的所有表面和軟管連接處進行仔細的檢查。冷卻水泄漏處通常有銹蝕，這容易被看到。同時也要對冷卻水風扇和驅動皮帶進行外觀檢查。發(fā)動機水套的開裂也偶爾存

40、在。當開裂發(fā)生時，發(fā)動機就會表現出過熱。水套開裂一般很難被查找到，因為對肉眼而言通常是不可見的。發(fā)動機冷態(tài)時開裂處閉合，只有在發(fā)動機熱態(tài)時開裂處才開啟，所以尋找開裂處會很復雜。 冷卻系的清洗 High Oil Consumption Unless very severely clogged with rust and hard scale，cooling systems can be cleaned with special chemicals designed for the purposeThe procedure is to fill the system with water，then

41、 put in the chemicalThe chemical，after dissolving the rust and scale，is flushed from the systemIn severe cases of c1ogged radiatorsit is necessary to remove them and have them cleaned by specialized equipment 冷卻系內除非已被鐵銹和水垢嚴重堵塞，否則可以使用特殊的化學物質來清洗。先給冷卻系加注水，然后加入化學物質。化學物質將鐵銹和水垢溶解，之后被水沖洗掉。散熱器嚴重阻塞時，可將散熱器拆卸，

42、并用專門的設備對散熱器進行清理。 High Oil Consumption 機油消耗過多 Quite often high oil consumption is blamed on the piston ringsWhile worn piston rings and cylinder walls do cause increased oil consumption，there are a great number of other things that could be at fault，either singly or in combinationWorn valve guides ar

43、e also a frequent cause of high oil consumptionWhen oil is being consumed by passing through the engine，it usually will cause heavy blue smoke to come from the exhaust，particularly after the engine has idled for several minutes 通常認為機油消耗過多歸咎于活塞環(huán)?；钊h(huán)和氣缸壁的磨損確實會引起機油消耗過多，但還有很多其他零部件單獨或同時出現故障也導致機油消耗過多。氣門導管

44、磨損也時常引起機油消耗過大。潤滑油竄到燃燒室燃燒時，通常會產生濃的藍煙從排氣管中排出，這種現象在發(fā)動機怠速了一段時間后更加明顯。 LOW Oil Pressure 機油壓力過低 In most cases of low oil pressure，the pressure is satisfactory when the engine is first started up，then it drops as the engine warms upThis condition is almost positive proof that excessive clearance exists at s

45、ome point，or points，such as connecting rod bearings，main bearings，camshaft bearings，etcWhen cold，the oil has thickened and does not flow as readily through the clearanceWhen the oil heats up and thins out，it flows through the worn bearings so fast that the pump cannot maintain sufficient pressure 多數

46、機油壓力偏低的情況是：發(fā)動機冷起動時，壓力合格，當發(fā)動機走熱后，壓力下降。這肯定說明在某處或多處間隙過大，如在連桿軸承、主軸承、凸輪軸承等地方。冷態(tài)時，機油粘度大，不容易流人這些間隙。機油溫度上升時，粘度下降，機油很快流人磨損的軸承，油泵不能維持足夠的油壓。 Chassis and Engine Vibration 底盤和發(fā)動機振動 Consider the case where there is a pronounced vibration in the car at a certain speed rangeFirst of all it is necessary to determine

47、 whether the unbalance is in the engine or the chassis Or bothIf it is in the engine，or the parts that rotate with the engine，the vibration should occur at the critical engine speed when the car is not in motion If it is in the chassis，it will occur only when the ear is operated at the critical spee

48、dIt is most likely to be found in the chassis，because the engine assembly is carefully balanced at the factoryOut-of-balance tires and propeller shafts are the most common causes of chassis vibration 假如汽車在一定的速度范圍內產生明顯的振動。首先有必要是發(fā)動機內還是底盤處或是兩者同時出現了不平衡。如果振動是在發(fā)動機內產生，則當汽車停止而零件隨著發(fā)動機旋轉時，振動應該在發(fā)動機的某個臨界轉速下產生。如

49、果振動在底盤，則只有當汽車達到了某個臨界速度時發(fā)生。通常振動出現在底盤，因為發(fā)動機總成在出廠前已經被仔細地平衡過。輪胎和傳動軸動不平衡是底盤振動的最常見原因。 Abnormal Engine Noises and their Causes 發(fā)動機異響及其原因 The following listing will point out the most common causes of sound itself and what must be done to eliminate them 下面列舉了產生各種異響的常見原因及其排除方法。 1.Piston slap is a very common

50、 noise most noticeable when an engine is coldA piston that slaps against the cylinder wall produces a hollow，muffled，belllike Soundquite audible when an engine is operating under load at low rpmPiston slap results from worn pistons or cylinders，collapsed piston skirts，excessive piston-to-cylinder wa

51、ll clearance，misaligned connecting rods，or a lack of lubricating oilTherefore，in order to correct piston slap，it will be necessary to replaced or resize thepistons，rebore the cylinder or replace the sleeves，replace or realign the rods，or add oil to the engine 1.活塞敲缸是非常常見的異響噪聲，尤其在發(fā)動機冷態(tài)時最明顯?；钊脫魵飧妆诋a生了

52、一種空的，沉悶的，敲鐘狀的聲音，當發(fā)動機在低速帶負荷下非常容易聽得見。活塞敲缸聲是因活塞或氣缸的磨損、活塞裙部變形、活塞與氣缸壁間間隙過大、連桿變形、以及潤滑油不足 等而產生的。所以，為解決敲缸聲音，有必要更換或改變活塞尺寸，鏜缸或更換缸套，更換或校正連桿，或給發(fā)動機加機油。 2.An abnormal sound originating from some form of piston-ring problem is audible during engine accelerationTo correct the cause of ring noise，it may be necessary

53、，therefore，to replace the rings，the pistons，or the sleeves or rebore the cylinders 2.當發(fā)動機加速時會產生明顯的來自活塞環(huán)的噪聲。為解決活塞環(huán)噪聲問題，有必要更換活塞環(huán)、活塞、缸套或對氣缸進行鏜缸。 3.A sound not frequently heard in an engine is that of a piston ring striking the ring ridge at the top of the cylinderThis particular problem causes a very d

54、istinct and high-pitched，metallic rapping or clicking noise audible at all engine speeds but particularly on decelerationTo repair the cause of this sound，it will be necessary to replace the piston pin or connecting rod bearings 3.發(fā)動機內有種不常見的異響是活塞到達氣缸上止點時活塞環(huán)敲擊活塞環(huán)槽造成的。這種特殊故障會引起一陣清晰高音的金屬敲擊聲，它在發(fā)動機的各個速度范

55、圍內均產生，尤其在發(fā)動機減速時明顯。為排除這種噪聲，有必要更換活塞銷或連桿軸承。 4.A piston-pin knock is noticeable most of the time when an engine is idlingPiston pin noise is usually the result。of a worn piston pin，piston-pin boss，pin bushing，or a lack of oilTo correct this problem，install oversize pins，replace the bushings and pins，or

56、service the engine with oil 4.活塞銷敲擊聲在發(fā)動機怠速時顯而易見?；钊N噪聲通常是由活塞銷磨損、活塞銷座孔磨損、銷軸瓦磨損或機油缺乏等原因引起的。安裝大尺寸的活塞銷，更換銷軸瓦和銷，或給發(fā)動機添加機油能排除這種故障。 5.An abnormal noise that is audible when the engine is running at speeds above 35 miles per hour（mph）without a load is usually the result of loose connecting-rod bearingsLoose

57、rod bearings cause a light to heavy knock or pound，depending on how badly the bearings are wornConnectingrod bearing noise can be due to a worn bearing，crankpin，misaligned rod，or lack of oilTo correct the noise，it will be necessary to replace the bearings，service or replace the crankshaft，realign or

58、 replace the rod，or service the engine with oil 5.發(fā)動機在無負荷下運行，若活塞線性速度超過35英里小時就產生噪聲，則通常是由連桿軸承松動造成的。隨連桿軸承磨損程度不同，松動的連桿軸承會引起不同輕重的碰撞聲。連桿軸承、曲柄銷磨損，連桿彎曲或缺乏機油都會引起連桿噪聲。這種故障可通過更換連桿軸承、維修或更換曲軸，校正或更換連桿，以及添加發(fā)動機潤滑油等方法來排除。 6.An abnormal noise that is audible upon engine acceleration under load is usually the result o

59、f a loose crankshaft main or thrust bearingMain or thrust bearing noise is usually the result of worn bearings，crankshaft journals，or a lack of oilTo correct this noise，it will be necessary to replace the bearings，crankshaft，or Service the engine with oil 6.發(fā)動機在帶負荷下加速時產生的噪聲通常是曲軸主軸承或推力軸承松動引起的。主軸承或推力軸

60、承噪聲通常是由于軸承磨損、曲軸軸頸磨損，以及缺乏機油等引起的。為解決此故障，有必要更換軸承、曲軸，以及添加發(fā)動機潤滑油等來實現。 7.A loose Vibration damper or flywheel can also cause abnormal engine noisesThis sound is more noticeable during engine acceleration from idle under load or at an uneven idlebut it is less apparent at higher engine rpm or during smooth