I sometimes hear a noise when i accelarate or go uphill.
The best way i can describe it is (small rocks in a pen being shaken)
My car is a 98 civic coupe approx 200,000km.
Does anyone know what this is? i know for sure its not the heat shield, the noise comes from the engine.

Sorry if i posted in the wrong thread im new to this.

 

I'd have to hear it to be sure but sounds like pre-detination. or the valves need adjusting. try running higher octane. if the noise goes away then you're looking at either your timing or carbs built up in the combustion chamber. run some seafoam (look up threads on it). If the noise stays. Have you serviced the valve clearance? how about the timing belt? when (if ever) did you change it?

 

are u trying to drive slowly up a hill in 5th gear??

 

^^ lol at engine cutting out because in wrong gear

 

no, he's describing the conditions that lead to detonation

pull the spark plugs and check their condition. if they are glazed, congrats, you have detonation

 

I changed my spark plugs 2 weeks ago
the car is automatic
the timing belt was done at 150k the car has 200k now

 

I am going to try putting a higher octane gas in my car see if that works.

 

what plugs did you put in? incorrect heat range will cause detonation

 

you'll just be masking the problem. It's better if you fix the actual problem.

 

cavitation maybe? bleed coolant.

 

NGK plugs from my honda dealer

 

still want the part number. there is no reason to think another plug couldn't find its way into the wrong parts bin. mistakes happen. that's why you need to check all 4 plugs.

the reason i'm being **** about this is b/c the alternatives are all pretty hardcore when it comes to detonation. and this is such a minor thing, i'd hate to overlook it and then come back an engine teardown later to find out it was a faulty plug.

the other possibilities are... well, a lean condition should set a CEL via the O2 sensors on an obd2a car, but you'd wanna check the O2 with a lambda sensor (wideband O2 which a real shop should have)... and our cars don't have EGR systems, so that's out of the question... it could be a PCV valve, oil vapors in the combustion chamber lower effective octane rating, so you might wanna check the PCV valve... other than that, i'd say the combustion chambers are so fouled that it's causing detonation, meaning it's time for a teardown and cleaning (but that's so unlikely that i think it ridiculous to even say it). it could be an injector too, but like I said before, that should set a CEL related to low output from the O2 sensors.

 

[quote=ol Dusty;130583 the valves need adjusting. [/quote]


i never thought of thatt, can you adjust it yourself? or is there a certain process or procedure to go accordingly ? so you dont mess up your motor lol

 

the procedure:

drive to mechanic, ask for valve lash adjustment

 

detonation on a 9:1 engine is pretty reaching i think

 

lol wtf

u cant do it urself?? thats ****ty

 

truth, but if it looks like a duck and kwaks like a duck...

only thing is i dunno how accurate dude's description is.

 

BOO YA

http://www.youtube.com/watch?v=89o5rLpbCgI

 

hahahaa yeah. Pull off your intake manifold and take a peak at when your lifters are bottomed out.. Goodluck!

 

lol not even close. i never said we couldn't do it. just no sense in posting a massive reply to it detailing how to do it when 1. you prolly won't do it, and 2. if you were to do it, you would spend smart money on buying a shop manual anyways. i did my first valve lash when i was 15 years old, but then again i also have shop manuals for every car i've ever owned in addition to textbooks on every aspect of a car (except actual engine building/blueprinting since i'd let a machine shop handle most of that anyways).