Engine noise at Startup

Rind · Apr 14, 2005

Hi Yall

Want to get some opinions here.
I have a Stock 2003 GT that after it sits overnight I hear what I refer to as a Engine Knock at startup for about 5 secs.
I use Red Line 5/20 Full Synthetic with a K&N Oil Filter.

The Ford Dealership is blaming this on the K&N Oil Filter.

I have sent email to K&N about this as I am having a hard time beleiving this.

Any thoughts?

02BlkStang · Apr 14, 2005

On my last mustang I had knocking when the engine started, but it went away once the engined warmed up.

Turned out to be a cracked exhaust manifold, ford replaced it and I didn't run into anymore problems.

trinity_gt · Apr 14, 2005

Go here:

http://www.bullittarchive.com/html/modules/articles/article.php?id=115

and read this:

"Mustang - Cold engine light ticking/rattle noise:
Some 2001-2002 Mustang GT and Bullitt with the TR3650 Manual Trasmission may exhibit a light ticking/rattle noise while driving after a cold engine start. The noise will typically occur between 2200-3500 RPM under light throttle (1/8 to 1/4 open) while driving. The noise may last for a few minutes (depending on temperature). The condition is due to the combination of light load operation noted above and normal piston to cylinder bore clearance present in the cold engine. To service, verify condition & reprogram the PCM with the latest calibration available via the just-in-time process if your WDS communicates with Fordstar. Also obtain calibrations on the Ford Professional Technician Society (PTS) website - select WDS then PCM reprogramming and click instructions for downloading... "

Mine rattles hard for a fraction of a second after start when stone cold as the engine races on the virtual fast-idle cam. After that, it's pretty much exactly as described above for a couple of minutes after driving off before it warms up.

Ford says it's piston slap. Does yours do this stuff too or is it only at initial start?

Rind · Apr 14, 2005

I havent noticed what you described below.

But I will certainly pay more attention during light loads , When I get the car back that is.

sgarlic · Apr 14, 2005

If you're serious about keeping the right oil and filter combo on your vehicle, you need to ditch that K&N oil filter ASAP, and get a Motocraft or Mobil 1 filter. Every study I've read on filters says K&N are terrible.

SilverGTV8 · Apr 14, 2005

sgarlic said:
If you're serious about keeping the right oil and filter combo on your vehicle, you need to ditch that K&N oil filter ASAP, and get a Motocraft or Mobil 1 filter. Every study I've read on filters says K&N are terrible.

Where did you read that?

sgarlic · Apr 14, 2005

There have been several threads in the last month over at modular depot .. and if I'm not mistaken, one of the same threads was also posted here. I think the title was oil testing results or something similar. K&N had good flow, but terrible filtering abilities.

SilverGTV8 · Apr 14, 2005

Well here is the common mistake people make.

A filter is not nessecary after the first pass of fluid through it. The oil system in a car is a closed circut (meaning not open to additional contaminates) Once it's filtered there is no need to filter it again. If the oil is performing it's job there is no contaminats created or added to the system. I used to cut my filters open every oil change with my ranger. Know what I found? Nothing not a damn thing, ever.

I go to school with a guy who works for a filter manufacture. He said the same thing that I said here. Filters are not needed after the first pass, because of the closed system. It's going to get all the contaminats in will in the first pass.

You know what the best filter is? Fram X2. Outperforms all the other filters.

I'll stick with my K-N. I like them and I have no worries. Tests results are useless unless you understand what exactly they are testing for, the reasoning for the test, and a complete understanding of the test procedure. Bench testing a filter is easy, real world a filter is not.

john_324 · Apr 15, 2005

SilverGTV8 said:
You know what the best filter is? Fram X2. Outperforms all the other filters.

Not trying to pick a fight, but do have a question: isn't that the exact opposite of what that exhaustive filter study (off-hand, I can't recall the author, but it's been posted here often and I'm sure others know of what I speak) concluded. I thought Frams were the worst filters. Enlighten me, please.

sgarlic · Apr 15, 2005

SilverGTV8 said:
Well here is the common mistake people make.

A filter is not nessecary after the first pass of fluid through it. The oil system in a car is a closed circut (meaning not open to additional contaminates) Once it's filtered there is no need to filter it again. If the oil is performing it's job there is no contaminats created or added to the system. I used to cut my filters open every oil change with my ranger. Know what I found? Nothing not a damn thing, ever.

I go to school with a guy who works for a filter manufacture. He said the same thing that I said here. Filters are not needed after the first pass, because of the closed system. It's going to get all the contaminats in will in the first pass.

You know what the best filter is? Fram X2. Outperforms all the other filters.

I'll stick with my K-N. I like them and I have no worries. Tests results are useless unless you understand what exactly they are testing for, the reasoning for the test, and a complete understanding of the test procedure. Bench testing a filter is easy, real world a filter is not.

I'm sorry, but your buddy who works for a "filter manucature" is incorrect. Oil filters are there not only to filter from contaminates which come from outside the system, but also from inside.. shavings is the first thing that comes to mind.

Secondly, the test run which said K&N and Fram were of the worst, WAS a real world test. The guy drove all the filters under the same controlled conditions in the same place, same mileage, same speeds, same temperature. The K&N was shown to have less filtering capabilities than the rest, and ditto for Fram.

I will try to find the study. He had full explanations of how testing was done, and more information than you'd ever care to read about it.

People in the mustang community don't bash people's filters for their health. Do you honestly think anyone gives a **** what you run? We all want the best for our cars, and Fram & K&N are not it.

mransr · Apr 15, 2005

for what it's worth...

automotive oils systems are NOT closed systems...if for no other reason than the rings will never seal 100% and oil will become contaminated from the combustion process...not to mention the PCV system

sgarlic · Apr 15, 2005

mransr said:
for what it's worth...

automotive oils systems are NOT closed systems...if for no other reason than the rings will never seal 100% and oil will become contaminated from the combustion process...not to mention the PCV system

Engine noise at Startup

Rind

New Member

02BlkStang

New Member

trinity_gt

Rind

New Member

sgarlic

SilverGTV8

New Member

sgarlic

SilverGTV8

New Member

john_324

New Member

sgarlic

mransr

sgarlic

Similar threads

Engine noise at Startup

New Member

New Member

New Member

New Member

New Member

New Member

Similar threads

Privacy & Transparency

Privacy & Transparency