Carbon

[skiiirt]

Is there such thing as a carbon knock

When i was getting my rubber put on the guy said my engine was knocking due to carbon build up?

 

BS or should i go buy a case of cleens?

[Crazy K]

Sounds like BS to me, our engines have some noise as normal. But a good cleens would not hurt, would it?

[skiiirt]

Already ran a bottle through it.. Didnt seem to help - I think it made the piece of carbon in my intake smaller.

 

The noise i think the guy was talking about is on a cold start. Sounds like a knock but can only be heard from inside the car. I've tried starting it with the door and hood open but i cant seem to hear it when i get out of the driver seat.

 

Lasts for maybe 15 seconds. Ive also tried to record it with my camera to no avail.

 

I'll go buy that case of cleens and run it through before my next oil change

[Crazy K]

Sounds like momentary oil starvation on startup. What oil and filter are you using? And do you have a funtioning pressure guage?

 

I notice my lumina more and more in the cold seems to take about three second for the guage to climb to it's high mark when started cold (maybe 10 F), but maybe 1-2 seconds when 32 F outside. I attribute this to needing 10w30 in a 207000 mile engine

[nebojsa_o]

I'll have to record a video of my car when I start it. That thing sounds very close to a diesel. Once it warms up after a few minutes, you can't even hear it run...

[skiiirt]

Sounds like momentary oil starvation on startup. What oil and filter are you using? And do you have a funtioning pressure guage?

 

I notice my lumina more and more in the cold seems to take about three second for the guage to climb to it's high mark when started cold (maybe 10 F), but maybe 1-2 seconds when 32 F outside. I attribute this to needing 10w30 in a 207000 mile engine

 

Pennzoil and unfortunately a mopar filter (they did the oil change against my wishes)

 

Ya know I think you are right about that. Am I doing damage to my engine by not having this changed? It's not exactly oil changing weather, and I dont have the tools (lift) to do it myself.

 

I BELIEVE I have an operating pressure guage. Which also reminds me, the pressure guage has been acting kinda wonky (maybe due to this shitty filter?) Like the guage normally sits at like 3/4 (sorry i cant rmemeber the numbers off hand (75 maybe?) and as of recent its been sitting halfways (50 maybe?) It's wierd. I went to check the oil to see if maybe the fucked up the oil change and didnt put enough/too much and after that the guage was fine for maybe 2 days, then back to it again.

[skiiirt]

I'll have to record a video of my car when I start it. That thing sounds very close to a diesel. Once it warms up after a few minutes, you can't even hear it run...

 

Ya i think you are right. Like a really quiet diesel engine. Sounds horrid for the first few seconds.

[nebojsa_o]

Mine sounds horrid for more than a few seconds, that's why I wanna know what it is.. I heard that all these engines do that, but it just seems a "little" on the extreme side. What kind of oil should we use when it's getting cold now?? 5w30, 10w30?? Something else??

[Crazy K]

Omigod! You sadist! get that MOPAR part off your car! lol

 

In fact I read that Mopar filters are often Fram filters in disguise, and then can suffer blled back.... or worse.....

read this to learn about oil filters!

http://people.msoe.edu/~yoderw/oilfilterstudy/oilfilterstudy.html

 

 

I have usually been able to do an oil change without jacking a car up, but a simple jack to pitch the car by lifting 3 or 4 inches on one side should give you clearance, if necessary.

 

Use a delco filter! I also use fully synthetic Castrol or Valvoline in my cars.

 

I also purchase and install a magnetic oil plug to help catch metallic debris in the oil. I buy these from Advanced. (I need to find the part number so everyone knows which works best)

[skiiirt]

 

I'll get that shit checked out on the double

 

If you can find info on that magnetic oil plug i'd be very happy, sounds like a hell of an idea.

 

I had a delco filter on b4 those cocksuckers changed my oil!

 

Anyways im off for the night. Thanks for the help and ideas!

[Crazy K]

I'll post when I find the part number. ttfn

[ron350]

Does the 3100 use the same oil drain plug as a 3800?

 

Magnetic oil drain plug for 3800 II = # 24100042

Cost $2.00 at dealer.

[Prospeeder]

My car has some lifter tick at start up, but its not like how your discribing loud and terrible, and i have a fram filter, the top end Xtra Gaurd one, carbon knock is when after the motor has been running for awhile, the carbon can get red hot and cause pre-detionation, and even diesling

[Crazy K]

The plug is a 12mm x 1.75 I cannot verify beyond that right now.... I know the plug I speak of is made by motormite.

 

The advantage is that it uses an imbedded O-ring like the 3100 motor factory plug uses (like the 94 and 95 CS) and seals great. My lumina's magnetic plug has a plastic gasket, it needs silicone everytime. The other plug would fit if i bought it, and be sevice free by comparison.

[joey b]

It is probaly lifter tick but can be caused by carbon buildup-- lots of it. Carbon buildup can cause the Compression Ratio of the engine to increase and if it is high enough, preignite. Maybe try some higher octane, but it probably is just lifter tick.

[nebojsa_o]

Well is lifter tick a horrible thing?? Assuming that's it, but I don't know, becuase I don't know what lifter tick sounds like.. And a descreption like Clunk, Clunk, Clunk, just won't do it....

[Prospeeder]

its just the seconds before the cold thick oil gets to the top end, nothing too serious as long as you don rev it up and what not

[nebojsa_o]

Well, mine lasts for over 2 minutes, until the engine warms up... It never did that in summer...

[Prospeeder]

hmm, cold weather would be the problem, sludge would block the flow, bad oil filiter would restrict it, its not bad, just dont get high into the rpms until it stops,urs is a 3100 right? it may be Piston slap too, the 3x00 engines are known for it, my moms 3400 has it in the mornings for a few minutes, its LOUD like ur diesle descriptions, its cause the piston skirts too short, and the piston slops around in the cylinder untill it fully heats up, cure for it, except longer piston skirts, and it doenst hurt anything, gm did a big study on it to make sure, so they didnt have to recall anything

[nebojsa_o]

Yea it's a 3100. So would piston slap be considered normal for these engines, or just possible to happen, but not right, and something is wrong?

[Prospeeder]

Very normal, they ALL do it, just how they were manufactured, it dosnt hurt anything, the reason if you didnt guess, is because when its heated up all the way, the metal expands a bit and makes a tight fit, while when cold it doesnt and the piston slops around in the cylinder, thats my take on it from my Auto teacher, (GM tech for 20 years) he says GM assured everyone it was completly normal and wont have negitive effects

[nebojsa_o]

That makes me feel better... I'll still record it one of these days, because it sounds like a diesel Jetta my neighour has

[1990lumina]

http://media.putfile.com/Excess-engine-knockingticking

 

My car makes that sounds for maybe 1-2 minutes, or not at all if I plug it in...

It's been doing it forever and the engine is still running so I don't worry about it

[Crazy K]

exactly what mine does when super cold. I need to see if there are metal particals on the magnetic oil plug next oil change... I've moved this summer and winter is much harsher here.

 

OIL PLUG Motormite 65372 "Pilot Point With inset Gasket" It is magnetic but the package doesn't say so.

[1990lumina]

Yeah you should here this thing when it's -40 or lower when I start it after sitting at school for around 8 hours lol...starts fine but yeah, makes a nice whining sound (oil pump??) because after that shuts up the pressure goes up as well lol