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Discussion Starter #1
i have a 2005 chrysler 300c (5.7l hemi) . 205000 km (128000 mi) on it.
1)i started hearing a noise "tik tik tik" on idle (but not on driving the car) and it also gave a code p1521(oil viscosity code). so i changed the oil to castrol edge 5w-40 fully synthetic as 5w-20(written on cap) is not available in Kuwait .the noise is reduced a great deal but i can still hear it after few minutes of engine start.
2) On cold start good amount vibration is felt .but as it reaches the normal temperature its all good.what could be the possible cause (i just changed the spark plugs)?
3) Upon driving it for some time and stopping on the signal the vibration comes back but very little.(does this means i have to get it tuned?)

Recent done's
1) Changed spark plugs
2) Poured Ac delco fuel injector cleaner in full tank (60 liters)
3) Throttle body Cleaned
4) new air filter
5) Changed Oil (5w-40 castrol edge fully synthetic)
* using a 95 octane fuel.
 

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The tick tick tick and shaking on cold startup is normal.

The minor change in the oil viscosity may not be an issue but eventually you may experience some driveability issues due to a malfunctioning MDS system.

During the next cold start, monitor the RPM at the start and when it settles down. Record both values.

The next time you are out for drive, come to a stop and experience the shaking, record the RPM value.

Some questions for you:

1. What brand and part number plug did you install?
2. When you re-installed the throttle body did you insure the air inlet sensor was set properly? The open bulb side of the small plastic assembly that sits in the airstream should be facing into the direction the air is coming from
3. When you cleaned the throttle body what did you use to wipe or brush the assembly?
4. How many miles (km) since you did all of the above?
 

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The tick tick tick and shaking on cold startup is normal.

The minor change in the oil viscosity may not be an issue but eventually you may experience some driveability issues due to a malfunctioning MDS system.

During the next cold start, monitor the RPM at the start and when it settles down. Record both values.

The next time you are out for drive, come to a stop and experience the shaking, record the RPM value.

Some questions for you:

1. What brand and part number plug did you install?
2. When you re-installed the throttle body did you insure the air inlet sensor was set properly? The open bulb side of the small plastic assembly that sits in the airstream should be facing into the direction the air is coming from
3. When you cleaned the throttle body what did you use to wipe or brush the assembly?
4. How many miles (km) since you did all of the above?
^ good advice right here... Also YouTube hemi tick and listen to the videos... Does yours sound similar? If so search out hemi tick on this forum and you will see that we all sound like a sewing machine in a McDonald's drive through! Lol



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silver06hemic;1142576 ........we all sound like a sewing machine in a mcdonald's drive through! .... [/quote said:
 

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Discussion Starter #6
The tick tick tick and shaking on cold startup is normal.

The minor change in the oil viscosity may not be an issue but eventually you may experience some driveability issues due to a malfunctioning MDS system.

During the next cold start, monitor the RPM at the start and when it settles down. Record both values.

The next time you are out for drive, come to a stop and experience the shaking, record the RPM value.

Some questions for you:

1. What brand and part number plug did you install?
2. When you re-installed the throttle body did you insure the air inlet sensor was set properly? The open bulb side of the small plastic assembly that sits in the airstream should be facing into the direction the air is coming from
3. When you cleaned the throttle body what did you use to wipe or brush the assembly?
4. How many miles (km) since you did all of the above?
The tik tik sound appears like its gone....but the vibration or shaking is still there
Cold Start RPM 800 (shaking)
Settled RPM 600 (about 30-40% shaking compared to Cold Start)
Driven and stop RPM 550 ( Almost the same shaking as the settled RPM)

1) Plugs = CHAMPION SPRE14MCC4
2) It appears that everything is intact
3) i got it done by a Mech. so no idea how he cleaned it...may be with a WD-40 or wiped it....totally blank on this one
4) Oil change is done a couple of days back....the rest u can say about 500kms (300mi)
 

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the cold and warm idle is too low. Cold idle will start at around 1100 - 1000 RPM, quickly settle in at 950 RPM as it warms up, eventually lowering to 750 RPM when warm.

The idle setting needs to be checked by a qualified mechanic who has access to Chrysler's scan tools.
 

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^ Agreed completely!! Your idle that low is causing you some problems!! Could possibly cause oil not to lube the top end quickly enough as well... get it in to a GOOD mechanic like Maddog said! You should put that right as soon as possible.
 
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Discussion Starter #9
what could be the possible cause for a low RPM values......low compression in some Piston ??? and can a low compression piston cause shaking in the car ?
 

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Low idle is caused by a vacuum leak, poor fuel pressure, blocked or faulty fuel injectors, throttle body faults, and a few other items that don't immediately come to mind.

As I said, a qualified mechanic is needed who can sort through the issues and perform the correct diagnostics.
 

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Discussion Starter #11
The bad....i did the cold start yesterday night and tried to maintain the RPM to 1000-1500 .....and it could'nt be maintained....the RPM kept on falling.......but i tried to kept it in that region and while doing it,a engine check light came up.....i turned off the engine and with the ACC-ON ACC-ON method i checked the code it is P0300 and P1521(OIL VISCOSITY).....no idea what to be done
The good....a small tube like thing going from the intake to the engine (i don't know what is that......maybe some kind of a breather) i took it off and then cold start it in the morning and the vibration or shaking appeared to be reduced significantly.........
A brief history
just for the info when i bought the car the engine oil was BLACK i replaced it and poured some oil (i even dont know the grade of tht oil) ....i replaced this oil like after 200 miles due to tht tik tik sound.....this oil was also as BLACK as was the previous one.....
the other history thing....the car had some water issues (the radiator kept on losing the water)....due to this it had overheating thing (it went to touch the red thing) but all this overheating was a mere 15 seconds game and the temperature came back to normal and i drove a few minutes to the petrol station and filled the radiator bottle....later it was diagnosed that the car had bad radiator bottle cap,leaking hose pipe and a leaking water pump.....i replaced water pump,hose pipe,thermostat,water bottle plus cap...its been more then 2 weeks and the temperature is normal plus the water is maintained between minimum and maximum level...
*during the cold start shaking there is a interval of something like a *missing* (that's the term v use here don't know what its actually called) ......by missing i mean the engine sound going down and returning back something like a athlete taking a small rest or breathing and then start running back again.......
 

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The hose thing needs to be on for the engine to work properly.

The oil viscosity thing maybe due to the viscosity of the oil that was used to flush it (you 200 mile experiment) or what was in in the engine before or what is in it now.

The idle issue still needs to be addressed.

For now, make sure you have the correct oil in the car and clear the codes.
 

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Discussion Starter #13
Hello. i just got my car checked by an American car specialist. he scanned my car and told me that my computer(i don't know what he meant by that) is having the problem. Further he showed me some readings from the PCM on his Laptop showing live car stats(as it was connected to car and the engine was turned on). he told me that the BAROMETER reading is not working and that is the cause of rough idle (less then 650 it is..sometimes in late 500) and shaking on standstill and cold start and it had a -- sign while other reading were in fluctuating numbers(.14245 etc).
he suggested me to change my car's Computer(i think he meant PCM) and he also said that they have to open my Car's Head (for this Barometer thing) ! idk but he was saying something like there is a map sensor or something which gets signal from this and as the Barometer is not working its not functioning properly.
ANYBODY HERE KNOW WHAT IS THIS BAROMETER THING !!!!
PLEASE REPLY
 
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