Small "knock" at idle...

SpikeMT · 04-21-2006, 08:31 PM

2003 Cobra w/ 14k miles.

I have a small "knock" at idle. Called the dealer and I am dropping it off next week.

Any ideas what it could be? Doesnt knock at start-up, just at idle. Pretty annoying...

Thanks
Steve

Big T · 04-21-2006, 11:09 PM

what mods do you have? Did it just start recently after a certain mod was installed?

SpikeMT · 04-22-2006, 11:05 AM

Nope, havent done anything...

I drive the car hard but who doesnt?

Oh well, an annoyance because I want to drive it but it will go to the dealer.

Steve

Big T · 04-22-2006, 08:14 PM

luckily you haven't done any mods yet. I'm sure it's just something minor. Good luck!

mrpork · 04-23-2006, 08:25 PM

make sure you let us know what the problem is

RedfireSVT · 04-24-2006, 12:47 AM

Head tick maybe?

blk04cobra1 · 04-24-2006, 06:59 AM

Im thinking piston slap, but would need to hear it

SpikeMT · 04-24-2006, 08:03 PM

Havent brought it to the dealer yet...but my guess is piston slap as well..

Steve

ausie · 05-13-2006, 08:51 AM

could be the valve train assembly, see thread: re-noisy lifter?-follow up

jjraiser · 06-02-2006, 10:28 PM

SpikeMT, I don't know your experience, so pardon me if I insult your intelligence with my question.

Do you think the noise you're hearing is the injectors? They can be fairly noisy, but only really heard at idle. They have that "mechanically rythmic" tapping sound to them sometimes.

Just a thought. I hope it turns out to be okay. Keep us posted.

SpikeMT · 06-03-2006, 09:59 PM

It isnt injectors

I sold the car to another dealer...made me an offer I couldnt refuse. I paid 24k and he offered me 26k. I, myself am a car dealer so it is in my blood to make money when it is offered

Unfortunately, I am no longer a Cobra owner but I am sure that wont last long...I really, really miss the car!

Steve

ausie · 06-04-2006, 01:15 PM

Sorry to hear you sold it, but guess it is someone elses problem now. A wild guess would point towards the valve lash adjuster. Since they are hydrollic and if one collapses and fails to hold oil pressure the rocker arm will begin to slap around against the cam when the valve spring pushes up on it. It may have been cured with a good motor flush then again probably not. I had a similar issue but only briefly which was fixed with adding solvents to the motor oil and ran the motor for 15 minutes at idle. The filter may have been a drastic removal since I basically shreded it into many pieces just to get it off the car. Have not heard the tap ever since. There is no garranty that solvents in the motor oil will cure a sticking valve lash adjuster but it could not hurt to try it if the tick happens suddenly. There is one reason why I avoid oils with anti-wear compounds since they can lead to issues with some hydrollic parts like timming chain tensioners, valve lash adjusters, and may cause a build up in the oil jets or bearing journals. I had a similar issue with my 01 which shortly happened after using Mobil 1 (which had been reformulated with anti-wear additives). At the time I may not have attributed that to be the cause but it may have contributed to it. Since then I have only used Amsoil or Royal Purple. When I had the similar issue happen with my 04 I used a different brand of oil (lucas synthetic along with the incorrect oil additive, I thought it was the pure synthetic oil stabilizer but got the other stuff which may have cause the tapping noise). The issue only took 500 miles of driving to occur which indicated to me to get it out of the motor ASAP. I do not think it was the oil that caused the issue but more or less the oil additive that did it.

04-21-2006, 08:31 PM	#1
SpikeMT Registered User Join Date: Dec 2005 Posts: 20	Small "knock" at idle... 2003 Cobra w/ 14k miles. I have a small "knock" at idle. Called the dealer and I am dropping it off next week. Any ideas what it could be? Doesnt knock at start-up, just at idle. Pretty annoying... Thanks Steve __________________ http://stevesjeepcountry.com "We Make'm Tough" I am into Mustangs and Jeeps!

04-21-2006, 11:09 PM	#2
Big T Registered User Join Date: Feb 2004 Location: Madisonville, Louisiana Posts: 249	what mods do you have? Did it just start recently after a certain mod was installed? __________________ 2003 black anniversary edition cobra Current Mods: Polished 2.3L whipple Kenne Bell BAP 60# injectors SCT BA 2600 3.5 whipple pulley with aux idler kit 2# LFP lower pulley dyno tune by L&L Automotive flowmaster american thunder catback bbk x-pipe with high flow cats bbk cai Accufab polished TB polished canton coolant reservoir tank LFP dual pass heat exchanger Polished intercooler reservoir tank upr polished underhood kit with hood prop Autolite racing spark plugs .032 gap hilton boost overlay Mickey Thompson ET Streets 275/40/17 566rwhp 536rwtq on mustang dyno Mods to come soon in order: suspension upgrade 2.75 upper pulley waiting for install

04-22-2006, 11:05 AM	#3
SpikeMT Registered User Join Date: Dec 2005 Posts: 20	Nope, havent done anything... I drive the car hard but who doesnt? Oh well, an annoyance because I want to drive it but it will go to the dealer. Steve __________________ http://stevesjeepcountry.com "We Make'm Tough" I am into Mustangs and Jeeps!

04-22-2006, 08:14 PM	#4
Big T Registered User Join Date: Feb 2004 Location: Madisonville, Louisiana Posts: 249	luckily you haven't done any mods yet. I'm sure it's just something minor. Good luck! __________________ 2003 black anniversary edition cobra Current Mods: Polished 2.3L whipple Kenne Bell BAP 60# injectors SCT BA 2600 3.5 whipple pulley with aux idler kit 2# LFP lower pulley dyno tune by L&L Automotive flowmaster american thunder catback bbk x-pipe with high flow cats bbk cai Accufab polished TB polished canton coolant reservoir tank LFP dual pass heat exchanger Polished intercooler reservoir tank upr polished underhood kit with hood prop Autolite racing spark plugs .032 gap hilton boost overlay Mickey Thompson ET Streets 275/40/17 566rwhp 536rwtq on mustang dyno Mods to come soon in order: suspension upgrade 2.75 upper pulley waiting for install

04-24-2006, 06:59 AM	#7
blk04cobra1 Registered User Join Date: Nov 2004 Location: Charlotte, NC Posts: 1,374	Im thinking piston slap, but would need to hear it __________________ 2004 Cobra HP Twin 67's 785rwhp on 9lbs of boost

04-23-2006, 08:25 PM	#5
mrpork SCMC Member Join Date: Apr 2005 Location: rhode island Posts: 408	make sure you let us know what the problem is

04-24-2006, 12:47 AM	#6
RedfireSVT Registered User Join Date: Mar 2006 Posts: 37	Head tick maybe?

04-24-2006, 08:03 PM	#8
SpikeMT Registered User Join Date: Dec 2005 Posts: 20	Havent brought it to the dealer yet...but my guess is piston slap as well.. Steve __________________ http://stevesjeepcountry.com "We Make'm Tough" I am into Mustangs and Jeeps!

05-13-2006, 08:51 AM	#9
ausie Don't let the dog drive Join Date: Apr 2004 Location: Kinston, NC Posts: 1,883	could be the valve train assembly, see thread: re-noisy lifter?-follow up __________________ 2004 SVT Cobra, Silver, February 2004 SVT Build # 2485 out of 3768 SLP Loudmouth Cat-back UPR double lock firewall adjuster UPR GMS extreme double hook quadrant Wheels: Ford SVT 10th anniv. wheels (track duty) SVE 10th anniv. style 17x9F, 10x10.5R BBS RK Plasma 18x8.5F, 18x10R (retired) (retired) 2001 black SVT Cobra, October 2001 missed but not forgotten

06-02-2006, 10:28 PM	#10
jjraiser Registered User Join Date: Apr 2003 Location: Pennsylvania Posts: 82	Injectors? SpikeMT, I don't know your experience, so pardon me if I insult your intelligence with my question. Do you think the noise you're hearing is the injectors? They can be fairly noisy, but only really heard at idle. They have that "mechanically rythmic" tapping sound to them sometimes. Just a thought. I hope it turns out to be okay. Keep us posted. __________________ Mods: Red Brembo 355mm Gran Tourismo front brakes, High-temp brake cooling ducts, Red Ford Motorsport rear calipers with matching Brembo rear slotted rotors and hawk pads, K&N Filtercharger, Borla cat-back (w/ heat wrap at the diff), Bosch Platinum Plus-2 plugs, Eibach Pro Kit, Red Sparco alcantara seats (w/ custom lowered seat racks), rear seat-delete, KB strut tower brace, Kirban shifter, Black Saleen-style rims (18x9 / 18x10), Goodyear F1 GS-D3s (255/285), Steeda battery relocation kit, Steeda Oil Separator, Steeda race wing (black w/ aluminum side plates), Shinoda front chin spoiler, Steeda clutch quadrant and firewall cable adjuster, Silverstar headlamps/foglamps.

06-03-2006, 09:59 PM	#11
SpikeMT Registered User Join Date: Dec 2005 Posts: 20	It isnt injectors I sold the car to another dealer...made me an offer I couldnt refuse. I paid 24k and he offered me 26k. I, myself am a car dealer so it is in my blood to make money when it is offered Unfortunately, I am no longer a Cobra owner but I am sure that wont last long...I really, really miss the car! Steve __________________ http://stevesjeepcountry.com "We Make'm Tough" I am into Mustangs and Jeeps!

06-04-2006, 01:15 PM	#12
ausie Don't let the dog drive Join Date: Apr 2004 Location: Kinston, NC Posts: 1,883	Sorry to hear you sold it, but guess it is someone elses problem now. A wild guess would point towards the valve lash adjuster. Since they are hydrollic and if one collapses and fails to hold oil pressure the rocker arm will begin to slap around against the cam when the valve spring pushes up on it. It may have been cured with a good motor flush then again probably not. I had a similar issue but only briefly which was fixed with adding solvents to the motor oil and ran the motor for 15 minutes at idle. The filter may have been a drastic removal since I basically shreded it into many pieces just to get it off the car. Have not heard the tap ever since. There is no garranty that solvents in the motor oil will cure a sticking valve lash adjuster but it could not hurt to try it if the tick happens suddenly. There is one reason why I avoid oils with anti-wear compounds since they can lead to issues with some hydrollic parts like timming chain tensioners, valve lash adjusters, and may cause a build up in the oil jets or bearing journals. I had a similar issue with my 01 which shortly happened after using Mobil 1 (which had been reformulated with anti-wear additives). At the time I may not have attributed that to be the cause but it may have contributed to it. Since then I have only used Amsoil or Royal Purple. When I had the similar issue happen with my 04 I used a different brand of oil (lucas synthetic along with the incorrect oil additive, I thought it was the pure synthetic oil stabilizer but got the other stuff which may have cause the tapping noise). The issue only took 500 miles of driving to occur which indicated to me to get it out of the motor ASAP. I do not think it was the oil that caused the issue but more or less the oil additive that did it. __________________ 2004 SVT Cobra, Silver, February 2004 SVT Build # 2485 out of 3768 SLP Loudmouth Cat-back UPR double lock firewall adjuster UPR GMS extreme double hook quadrant Wheels: Ford SVT 10th anniv. wheels (track duty) SVE 10th anniv. style 17x9F, 10x10.5R BBS RK Plasma 18x8.5F, 18x10R (retired) (retired) 2001 black SVT Cobra, October 2001 missed but not forgotten

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