Bad Plugs or Bad piston?!? Help

01Stang65

New Member
Jan 19, 2017
26
0
1
22
I am going to try to be as thorough as possible. I am going to list all symptoms since I have owned the car.

I bought my 2001 GT with 47k miles on the odo. The car now just passed 70k. Since then I have done an O/R midpipe/catbacks, and changed the plugs once (went to autolite which I regret doing). When I installed the exhaust I noticed a hush sound of "air flow" below the passenger seat. I assumed it was a small exhaust leak, never got around to doing anything with it as it seemed harmless.

This is where it gets rough. Ever since I owned the car, I have had an issue with it starting up every once in a while. Sometimes after it would start, it would almost die immediately. Never had an answer for it and it never seemed to cause any real issue. Last year I did a 3-4 gear pull and at the top of 4th gear the car misfired bad. That is when I installed the autolite plugs. Last night, I went to do a 3-4 pull, and when I got on the brakes right after the pull, I completely lost power steering, brakes, lights, and I couldn't hear the engine anymore, so I figured it shut off. I went to turn the key as I was rolling to realize the engine was still running, just at very low rpms. As I tried to put the engine into 4th, the revs were super weak.

There is a ticking coming from right behind the passenger wheel, and I can hear it out the exhaust. I am thinking this is the exhaust leak I was talking about earlier. That can be fixed. However the spark plug on cylinder 6 (3rd one back on passenger side) had zero gap in it when I pulled it out. All the other plugs were fine. I stuck a coat hanger down the cylinder and hand cranked the engine to feel for piston movement and it was moving.

There was a small knocking coming from the other side of the engine bay, but I almost think it is a loose engine mount, the car seemed to be shaking pretty bad.

I'm looking for possible suggestions and past experiences. I will be getting a borescope down in the cylinder sooner than later.
 
  • Sponsors(?)


Danny2v

Member
Jun 24, 2019
50
1
8
21
California
Is it possible you were given the wrong plugs causing the Piston to slam into the plug? Does your exhaust almost sound like a mild cam?
 

01Stang65

New Member
Jan 19, 2017
26
0
1
22
Is it possible you were given the wrong plugs causing the Piston to slam into the plug? Does your exhaust almost sound like a mild cam?
I thought about that but they were the correct plugs... Just autolite. The exhaust didn't exactly sound right after the misfire, but I have a bad leak somewhere, I wonder if I is talked the gasket backwards when I did my midpipe 2 years ago, I don't do hard pulls often and maybe it blew that gasket. I'll install the gasket tomorrow morning and see if that takes care of the ticking.

Either way when I fix the misfire with these new plugs I'm taking it to a shop to have them examine the inside of the cylinders
 
Thread starter Similar threads Forum Replies Date
D Oil Drain Plug Bad? Fox 5.0 Mustang Tech 10
B Mustang Jerks really bad when voltage regulator plugged in Fox 5.0 Mustang Tech 1
D One Spark Plug Cylinder fouling plugs - performance bad - blue smoke SN95 V6 Mustang Tech 1
155dB5.0 Do these plugs look bad?? Fox 5.0 Mustang Tech 7
95Cobra302 Bad Plug Wires 1994 - 1995 Specific Tech 7
S Bad example of HID plug n play kit 1996 - 2004 SN95 Mustang -General/Talk- 16
allballsmustang clean plugs bad? Fox 5.0 Mustang Tech 2
Methodical Car won't start with SPOUT plugged in..bad computer??? 1994 - 1995 Specific Tech 21
tanion Question about SES light in relation to possible bad coil on plug SN95 4.6L Mustang Tech 2
B bad idle,plugs fouling out Fox 5.0 Mustang Tech 4
Y i mixed spark plugs is this going to be bad SN95 4.6L Mustang Tech 13
ninety1gt bad plugs?? Fox 5.0 Mustang Tech 3
N bad plugs cause idle problem? need help Fox 5.0 Mustang Tech 7
jaidedeye bad plug wires..wich ones to get ??? Fox 5.0 Mustang Tech 25
H I assume coolant in spark plug well is bad? SN95 4.6L Mustang Tech 6
Slow5.0 I have plugged EGR ,so air can't come inside of Intake through EGR "GOOD or BAD" 1994 - 1995 Specific Tech 4
J ford racing 9mm plug wires good or bad? Fox 5.0 Mustang Tech 15
A Spark plug change gone bad SN95 4.6L Mustang Tech 26
LX Dave Holley Sniper review - The good, the bad, and learn from my frustration 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
danielhv Bad Idle Air Control Valve? Digital Self-tuning Forum 9
W 1997 Mustang GT overheating badly - Tried almost everything 1996 - 2004 SN95 Mustang -General/Talk- 3
5 Shifts bad into 1st and reverse 1996 - 2004 SN95 Mustang -General/Talk- 1
Creomod Gas has bad smell Horrible Smell Fox 5.0 Mustang Tech 17
D T5 swap gone bad Fox 5.0 Mustang Tech 14
C Bad time to buy battery? 1996 - 2004 SN95 Mustang -General/Talk- 8
A Exhaust Some issues resolved but still running bad Fox 5.0 Mustang Tech 31
J Bad interior rear view mirror 1965 - 1973 Classic Mustangs -General/Talk- 9
PDHSB Really bad pitting on cams, wear on chain. 1996 - 2004 SN95 Mustang -General/Talk- 3
91GTstroked Engine Bad A9L computer? Fox 5.0 Mustang Tech 13
Andresquintana.mma Engine Another bad distributor? Fox 5.0 Mustang Tech 39
D 1999 mustang gt bad ideling 1996 - 2004 SN95 Mustang -General/Talk- 1
D How to know if car springs are bad on just shocks? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
B Tick is it bad or normal 2015+ (S550) Mustang -General/Talk 0
Mixveez Bad idle and dying in neutral. Fox 5.0 Mustang Tech 5
91GTstroked Brakes Bad brake booster! Fox 5.0 Mustang Tech 14
L Bad rotors 2005 - 2014 S-197 Mustang -General/Talk- 10
D Engine v6 bought as bad starter turned out to be locked motor. SN95 V6 Mustang Tech 3
S Engine Bad Shudder and Bad Codes Fox 5.0 Mustang Tech 2
T 1995 mustang overheating BAD!! 1994 - 1995 Specific Tech 33
C Bad fuel pump signs? Fox 5.0 Mustang Tech 5
J Bad wiring for fuel pump relay/constant priming? 1992 mustang gt Fox 5.0 Mustang Tech 8
Sonicstang0494 Bad throwout bearing SN95 4.6L Mustang Tech 2
W 1990 mustang treated badly, needs restore engine upgrade 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
GalacticPonage Drivetrain Bad Spider Gears Fox 5.0 Mustang Tech 2
N Need help bad The Welcome Wagon 0
J Running badly. Digital Self-tuning Forum 3
Treena Please help asap - Good deal or bad mojo?Prob w ps pump & brakes 1996 - 2004 SN95 Mustang -General/Talk- 9
D Runs bad in gear but 1965 - 1973 Classic Mustangs -General/Talk- 13
JCBeaver Fox Do I have a bad ground? Intermittent starting/electrical issue (93 GT) 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
D Bad Stutter After Wot SN95 4.6L Mustang Tech 1
Similar threads