Cold Start Engine Noise
August-29th-2002, 04:50 PM
#1
Registered User
Thread Starter
Join Date: Aug 2002
Posts: 5
Cold Start Engine Noise
I have an '01 Protege ES, K&N OEM replacement, and Mobil1 10-30
The engine makes a slight knock on cold start, light pressure on accelerator makes a noise like a little man with a hammer inside my engine.
Dealer says that Mazda is "aware of the noise, but dosent have a fix" ( what is this, software ? ) they have engineering working on the problem, and will contact me when they figure out whats wrong with the car!
Anyone else have funny noises on cold start?
-Mike
The engine makes a slight knock on cold start, light pressure on accelerator makes a noise like a little man with a hammer inside my engine.
Dealer says that Mazda is "aware of the noise, but dosent have a fix" ( what is this, software ? ) they have engineering working on the problem, and will contact me when they figure out whats wrong with the car!
Anyone else have funny noises on cold start?
-Mike
August-29th-2002, 06:12 PM
#3
has issues
Join Date: Apr 2002
Location: Orlando, FL
Posts: 304
Originally posted by azrakain
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
To answer your question, WhiteBlurs, this is a common problem in 2.0L Protege's. Not everyone has it though, I'd say about half or so from what I've seen. I myself don't have the problem so I didn't pay much attention when everyone here was talking about it, but I remember it has something to do with an emissions control device. There was a temporary fix someone came up with, maybe someone else can post it.
August-29th-2002, 06:25 PM
#4
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Join Date: Dec 2001
Posts: 232
the rattle is caused by the variable timing system that reduces cold-start emissions. There is a simple fix, but Mazda can't do it because it disables the Variable timing system. There is a solenoid with a green clip near your sway bar in the engine bay. Disconnect the vacuum tube that is vertical and put electrical tape over it. Then, get a rubber cap from the auto parts store to put on the solenoid. This does no harm to your engine. It simply increases your cold start emissions.
August-29th-2002, 07:29 PM
#5
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Thread Starter
Join Date: Aug 2002
Posts: 5
Originally posted by Hawkeye
the rattle is caused by the variable timing system that reduces cold-start emissions. There is a simple fix, but Mazda can't do it because it disables the Variable timing system. There is a solenoid with a green clip near your sway bar in the engine bay. Disconnect the vacuum tube that is vertical and put electrical tape over it. Then, get a rubber cap from the auto parts store to put on the solenoid. This does no harm to your engine. It simply increases your cold start emissions.
the rattle is caused by the variable timing system that reduces cold-start emissions. There is a simple fix, but Mazda can't do it because it disables the Variable timing system. There is a solenoid with a green clip near your sway bar in the engine bay. Disconnect the vacuum tube that is vertical and put electrical tape over it. Then, get a rubber cap from the auto parts store to put on the solenoid. This does no harm to your engine. It simply increases your cold start emissions.
So is this damaging the engine, should I take steps to correct it, as you've suggested I could, or should I not worry about it?
Also, how long do you let the car warm up for before putting it in gear?
August-29th-2002, 10:30 PM
#6
Registered User
Join Date: Dec 2001
Posts: 232
I wouldn't say the variable timing is damaging to the engine, AFAIK. However, the main reason to "fix" it is because it can be annoying and even a little embarassing (i.e. "look at that ghetto car making all that noise").
As far as warm up goes, I usually only go about 30 seconds in the summer and about 3-5 minutes in the winter.
As far as warm up goes, I usually only go about 30 seconds in the summer and about 3-5 minutes in the winter.
August-30th-2002, 07:42 AM
#8
Jedi Master Yoda
Join Date: Jan 2002
Location: Asheville NC
Posts: 528
The protege has no such thing as variable timing. THe solenoid you are referring to is the solenoid for the VRIS variable resonance intake system. This is a solenoid that opens up a second set of long intake runners at higher RPMs to let the engine breath better and let the short runners make more torque down low. This has nothing to do with emissions. Whoever told you that is an idoit.
August-31st-2002, 01:48 AM
#10
Protege Enthusiast
Join Date: Mar 2002
Posts: 88
Originally posted by chdesign
The protege has no such thing as variable timing. THe solenoid you are referring to is the solenoid for the VRIS variable resonance intake system. This is a solenoid that opens up a second set of long intake runners at higher RPMs to let the engine breath better and let the short runners make more torque down low. This has nothing to do with emissions. Whoever told you that is an idoit.
The protege has no such thing as variable timing. THe solenoid you are referring to is the solenoid for the VRIS variable resonance intake system. This is a solenoid that opens up a second set of long intake runners at higher RPMs to let the engine breath better and let the short runners make more torque down low. This has nothing to do with emissions. Whoever told you that is an idoit.
People on the protegeclub that have taken their car in for the rattle have been told that the cause of rattle is related to timing which is changed to help out with emissions. Somehow, this is apparently what causes the rattling. Some here have speculated that this rattle could be slight knocking or detenation that occurs momentarily at a certain RPM while the engine is cold. I dont know that anyone know for sure what it is. Ive been running with the VTC solenoid vacuum hose disconnected for about 5 months without any problems, other that it seems that the car hesitates if you give it too much gas without warming it up. Once its warm, this doesnt happen any more.
Once the search feature is back up, check it out... there is tons of info on this topic, although its not really a resolved issue yet.
August-31st-2002, 01:52 AM
#11
Jedi Master Yoda
Join Date: Jan 2002
Location: Asheville NC
Posts: 528
WHAT are you talking about follow the vaccuum lines. The one solenoids I explained is the VRIS the other is a solenoid to the Fuel Pressure Regualtor. It cuts off the vaccuum source at WOT to get a full fuel pressure situation in WOT. I have never heard of this VTC you talk of and there are only 2 solenoids one for the VRIS and the other for the pressure regulator follow the vacuum lines and you will see what i'm talking about.
August-31st-2002, 03:20 AM
#12
Mazdago 1931
Join Date: Jun 2002
Location: Finland
Posts: 296
Originally posted by WhiteBlurs
So do you know anything of this knock I speak of?
So do you know anything of this knock I speak of?
August-31st-2002, 07:33 AM
#13
Mazdago 1931
Join Date: Jun 2002
Location: Finland
Posts: 296
Originally posted by azrakain
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
August-31st-2002, 07:33 AM
#14
Mazdago 1931
Join Date: Jun 2002
Location: Finland
Posts: 296
Originally posted by azrakain
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
Other than intakes, that is the most debated issue on this site!!!! Use the search button and you'll find 10-20 threads dedicated to this issue.
"There seems to have been a slight problem with the database. bla
