knocking

Asked by Oct 02, 2010 at 01:57 PM about the Dodge Avenger

Question type: Maintenance & Repair

it knocks louder if you turn on the ac. should i be worried.

18 Answers

15

take your car to gas station.. use a higher grade of fuel (97 octance fuel) will solve it on your car.. good luck . from Dave.

1 of 1 people found this helpful.

cool will try it and hope it works thanks.

175

stop telling people to use higher grade fuel. they will be spending pointless money. neither engine is designed to run on 97 octane fuel. if it was than it would say PREMIUM FUEL ONLY, but it doesn't it just says UNLEADED FUEL ONLY. try to explain the noise more. is it more of a ticking or a knocking? can you hear it just driving down the road or only when sitting still? the A/C puts drag (aka load) on the engine, making it work harder. this means your RPMs will drop slightly in park, or hang some what while driving. the extra load of the A/C compressor is probably what's affecting the sound, but again i would need a better description to be for sure.

2 of 2 people found this helpful.
12,575

actually a higher grade of fuel could solve the problem, if its knocking the fuel is predetonating (firing before the spark plug sparks) premium grade fuel isnt a waste of money at all so stop telling people it is. higher octane fuel is more stable than low octane fuel and may solve the problem. i doubt its any thing more than pre detonation but still thats bad for the engine, ticking would be more of a stuck hydraulic lifter or some thing along those lines i hope that helps

175

the the octane of gasoline was the only issue then why doesn't every single avenger have a knocking problem? because gasoline isn't the problem. if he has pre-detonation than there is a bigger issue than just his octane rating. could be timing is off, who knows? also people who are not gear heads tend to describe their problems in a worse way than they really are. they shay "knocking" when really it's only ticking. unless you get more information on something like that it's hard to diagnose. and lastly there are plenty of studies that show higher octane ran in an engine that doesn't need it is not justified. you are spending more money for very little improvement if any. don't get caught up in oil company's propaganda to get you to spend more money.

2 of 2 people found this helpful.
12,575

listen genius, not every car is going to have the same issue if one does for instance, my 2004 ram 3500 had a problem where water leaked into the cab, but my friend who had the exact same truck did not, shit happens. and id love to see that study about higher octane fuel being no more stable than regular octane fuel, cars requiring high octane fuel do so because they have a slightly higher compression ratio under which regular octane would predetonate, more octane molecules make fuel more stable, i dont know much of any thing about these specific cars as a whole but i know almost every car has a slightly different timing some cars will have a slightly advanced time while others may have a slightly retarded timing, it just happens. and i read what the issue was, theres a knocking coming from the engine, and when the AC is turned on the knock gets louder, it says nothing about a tick.

2 of 2 people found this helpful.
175

cars with higher compression NEED the higher octane. the dodge avenger has a compression ration of 9.6:1 which is not high at all. using higher octane is a car that is not meant for it is useless. and if you think about it, it might even be bad for it. higher octane burns faster and hotter and is more explosive. if the engine is not made to handle gasoline that burns that hot, you will get extra wear on the engine. i understand not every car has the same problems, you're missing the point. but gasoline is something that every car needs. 2 engines from the same car are not going to be made different enough to have one need premium gasoline, and the other only need regular. it's not like one of the engines is going to have a 12:1 compression ratio. also with the invention of electronic control units, differences in timing are almost 0. all dodge avengers (with the same engine) have the exact same program loaded into their ECU. with the exception that the 5 speed has a slightly higher rev limiter. other than that all the timing is going to be the same. the v6 does have a distributer, but again if that's the issue (the distributer is not aligned properly) than that's what needs to be fixed, not the gasoline. you are trying to find a simple solution to a more complex problem. and you are wrong.

1 of 1 people found this helpful.
12,575

like i said i know nothing about these cars as a whole, i think gas engines need to be done away with completely, any thing a gas engine can do a turbo diesel can do easier cleaner and more efficientl. im honestly too lazy to read 3 paragraphs of jargon though.

1 of 1 people found this helpful.
7,535

gas is where its at for street vehicles. diesel is good for work trucks and semis.

first thing i would check is the haromnic balancer to see if the rubber in it is dryed out and cracked,it will woble and make a knocking noise,since the ac is so close to it turning it on puts more pressure on it, and noise travles,as for the gas postings it dont matter what grad you run,it wont solve your problem.

1 of 1 people found this helpful.
7,535

A lot of times people describe a tick as a knock. My guess is leaking exhaust manifold or bad motor mount.

1 of 1 people found this helpful.
12,575

a tick can be any thing hell if it gets louder when he turns his AC on it could be his AC clutch haha

1 of 1 people found this helpful.
75

No. Take off the valve cover and tighten the bolts. the knocking should be fixed, for the time being. Its just the design of the car. Nearly all the old Avengers develope the knocking. All you need is the new gasket for the valve cover. After that use a heavier weight oil.

1 of 1 people found this helpful.
75

lol no it wont

1 of 1 people found this helpful.
175

a heaver weight oil is a bad idea. 10w-30 is the thickest oil that should ever be put in an avenger. the oil journals in this engine and NOT designed for heaver weight oil, and you will just end up with clogged oil journals. besides, thicker oil is not fixing the issue, it's just fixing the symptoms.

1 of 1 people found this helpful.
175

a permanent fix for this issue is to upgrade the lifters. get PT cruiser lifters and rockers and you will never get lifter tick again (assuming you have the 2.0L 4 banger.)

1 of 1 people found this helpful.

where do you come up with theses idiot answers.

1 of 1 people found this helpful.
10

it has nothing to do with the gas,it is a lifter noise,tried running part synthetic oil after 100,000 and developed the "tick"on the right side engine closest to the firewall.tried changing back to multi grade oil with no resolve .car has 130,000 miles.,3.6 pentastar engine.

1 of 1 people found this helpful.

Your Answer

Avenger

Looking for a Used Avenger in your area?

CarGurus has 4,457 nationwide Avenger listings starting at $1,500.

ZIP:

Dodge Avenger Experts

  • #1
    Tom Demyan
    Reputation
    760
  • #2
    Janis Jackson
    Reputation
    380
  • #3
    thedoctor
    Reputation
    360
View All

Related Models For Sale

Used Dodge Charger
417 Great Deals out of 27,419 listings starting at $2,495
Used Dodge Challenger
278 Great Deals out of 21,942 listings starting at $6,900
Used Dodge Dart
266 Great Deals out of 8,194 listings starting at $3,495
Used Chevrolet Malibu
1,072 Great Deals out of 72,017 listings starting at $1,896
Used Ford Mustang
709 Great Deals out of 38,398 listings starting at $895
Used Chevrolet Impala
479 Great Deals out of 33,615 listings starting at $777
Used Ford Fusion
977 Great Deals out of 71,084 listings starting at $1,200
Used Chrysler 200
299 Great Deals out of 16,691 listings starting at $2,900
Used Dodge Caliber
70 Great Deals out of 2,247 listings starting at $888
Used Nissan Altima
989 Great Deals out of 74,664 listings starting at $1,500
Used Chevrolet Cruze
904 Great Deals out of 59,595 listings starting at $3,490
Used Honda Accord
1,033 Great Deals out of 60,523 listings starting at $999
Used Chrysler 300
329 Great Deals out of 17,504 listings starting at $1,000
Used Chevrolet Camaro
384 Great Deals out of 30,498 listings starting at $3,500
Used Dodge Journey
401 Great Deals out of 23,718 listings starting at $2,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.