Engine Infamous 2v Tap/knock?


New Member
Jul 17, 2016
I've searched through multiple forums and can't seem to find anything exactly like what I'm experiencing. I've looked through the threads, searched endlessly and still nothing like what my car is doing. Its a 98 2v, and it's done this noise ever since I got the car 2 months ago. I'll give you the most accurate description as possible and answer any questions for you to the best of my knowledge.

On cold startup, the tick/tap/knock is nonexistent. After it warms up for a while or has been driven, you can hear it when giving it gas. Then after about 30 mins of driving, you can hear it at idle but it's not really loud. When you rev it, it gets louder. It's really hard to pin where it's coming from with all the engine noise. I've jacked the car up, laid under it, stuck my hand on the valve covers, etc.. first i thought it was coming from the valve covers, then someone mentioned they had an exhaust manifold leak and it sounded similar so I figured it was that but the more I listened to it, it's more of a tap noise. Someone said rod bearings but it's not something that shakes/knocks the whole engine. Someone said timing chain but it's not coming from the front of the engine
It's definitely the back. Sounds like either in the bell housing or in the gearbox. When revved, it taps fast then the rooms drop and it makes an odd.. almost a grinding noise 3 times then goes back to normal idle. It's very frustrating and embarrassing. It's a really nice car, showroom condition but sounds like a worn out work truck tapping like that. I was leaving McDonald's this morning and got mad about the sound when I started pulling out of the red light so I floored it at about 35mph and broke loose then when I got to the next red light I noticed it was quieter. When idle and when pulling off, it was quieter. could I be overreacting and it just be bad oil delivery to the valve train? Or could it be in the tranny? Or could it really a rod? My cobra hasn't had any problems with knocks or taps in the 7 years I've had it so I'm lost.
  • Sponsors(?)


Drone Driver
Mod Dude
Mar 2, 2003
Sea of Tranquility
Is it an auto? Good that you came back with the fix. I would have never thought the tranny would make a noise like this at idle. Good to know.


Active Member
Mar 10, 2007
The Pocono's
I'm very very curious of the actual sound, wish we had a video or audio clip. Can you describe exactly how you figured out the problem? Might help a lot of people in the future.
Thread starter Similar threads Forum Replies Date
A The infamous rattle 2005 - 2009 Specific Tech 0
S197GT Trying to fix the infamous water leak 2005 - 2009 Specific Tech 1
R Engine Infamous "bucking" problem!! Fox 5.0 Mustang Tech 7
tha great one The Infamous 85mph To 140mph Swap!!! Fox 5.0 Mustang Tech 15
CNCguy The Infamous Rattle 1996 - 2004 SN95 Mustang -General/Talk- 7
SPCChavez the infamous "cam position sensor" code NEED HELP!!! 2005 - 2014 S-197 Mustang -General/Talk- 16
B infamous idle problem i need help!!!! Fox 5.0 Mustang Tech 0
katshot Re: The infamous "clunk" SVT Tech Forum 6
BlkOnBlk04Cobra Searching for the infamous F*in' Fast Shifter Knob... SVT Tech Forum 6
B Infamous cobra engine into GT questions? SN95 4.6L Mustang Tech 1
S Infamous 3.73's or 4.10 question 1996 - 2004 SN95 Mustang -General/Talk- 28
281CI96Coupe The infamous hot start SN95 4.6L Mustang Tech 13
281CI96Coupe Infamous Chirping Sound - Heater Blower SN95 4.6L Mustang Tech 1
C the infamous swap 1994 - 1995 Specific Tech 7
J the infamous 03 tick SVT Tech Forum 2
B The infamous 5spd clunk sound SN95 4.6L Mustang Tech 10
05MGT Does any body here NOT have the infamous front suspension thunk? 2005 - 2014 S-197 Mustang -General/Talk- 28
J Infamous Tremec Vibration issue finally solved 1994 - 1995 Specific Tech 12
H The infamous SWAP to 5.0!! Can it be? 1994 - 1995 Specific Tech 25
9 so whos all running the infamous afr 165s on stock shortblock? Fox 5.0 Mustang Tech 15
1TallMF The infamous battery light came on last night... 1994 - 1995 Specific Tech 5
S Not 5.0 but it's back! The infamous Evo vs 05 R1 & ZX10 with nitrous! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 11
84convertablegt Infamous throttle body size question!!! 1994 - 1995 Specific Tech 12
Chowder Head The infamous bogging...how do I get rid of it? 1994 - 1995 Specific Tech 5
CBZGT50 The infamous Mustang loss of traction..... 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 14
O The infamous Prostar question !!! Fox 5.0 Mustang Tech 0
Redfire03GT Infamous Ticking Heads.. SN95 4.6L Mustang Tech 13
S Might have Infamous Tremec Problem SN95 4.6L Mustang Tech 2
N Tapping sound 1996 - 2004 SN95 Mustang -General/Talk- 1
F Tapping kind of noise when engine revved and no load on motor. 1996 - 2004 SN95 Mustang -General/Talk- 4
0 Knocking/tapping noise 2006 3v 2005 - 2009 Specific Tech 1
B Squeal when tapping Gas, Not belt or Pulleys 1996 - 2004 SN95 Mustang -General/Talk- 0
I Tapping on fuel lines and trouble starting SN95 V6 Mustang Tech 2
9 96 4.6 2v..knock/tap noise? 1996 - 2004 SN95 Mustang -General/Talk- 1
C Engine Tapping 2005 - 2014 S-197 Mustang -General/Talk- 0
twohawks777@cox How to tap a Canton oil pan with main girdle installed on the motor. Digital Self-tuning Forum 2
C Engine 1999 Mustang V6 / Engine is Tapping but Not Knocking goes away after 1 - 5 mins idling / Possible Oil Pump? SN95 V6 Mustang Tech 2
S Transmission tapping SN95 4.6L Mustang Tech 5
S Trans tapping 1996 - 2004 SN95 Mustang -General/Talk- 0
P Tapping Under Valve Covers, Sewing Machine Noise? 1965 - 1973 Classic Mustangs -General/Talk- 9
GreeZdLighTNin Engine Tap. 4.6, 3v 2005 - 2014 S-197 Mustang -General/Talk- 8
something_lurks Clicking Or Tapping At Idle 1996 - 2004 SN95 Mustang -General/Talk- 5
J Mustang Rocker Arm / Valve Tap 1994 - 1995 Specific Tech 20
5 5.0 Motor Ticking/tapping Noise Fox 5.0 Mustang Tech 6
B Engine Please Help I Need Advice On Ticking Or Tapping Noise Fox 5.0 Mustang Tech 6
usaf_branham I Hear The Sound Of Taps... 1996 - 2004 SN95 Mustang -General/Talk- 13
H Ideas On How To Tap Oil Pan Fox 5.0 Mustang Tech 4
doobismaximus Engine Tapping The #5 Runner 1994 - 1995 Specific Tech 4
keybrdcowboy1 Help Using A Tap 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 16
Joe Scrivens Tapping From Vavle Train Sounds Like Tractor? Fox 5.0 Mustang Tech 22
Similar threads