V6 RIDICULOUS SHAKING

Crashnburn110985 · January 22nd, 2012, 09:37 PM

I have a 1999 V6 foxbody mustang 3.8, recently it had been running really hard and shaking a bit, so I change the motor mounts and now the shaking is worse! It Idles ok once it is below 1,000 rpms at 1,000 the shaking is the worst and feels like the car is gonna fall apart once it is above 1,500-2,000 rpms it normal, but it will not rev past 4,000 RPM its as if its hitting the rev limiter (my car is a manual). On top of that there is a slight knocking noise not loud but quiet and faint. I have changed:
the spark plugs
Spark plug wires
Igition coil
Ive cleaned the Throttle bottle
recently I changed the Idle control valve

I am lost and dont know what else to do please someone help me!

Green_6er · January 22nd, 2012, 09:46 PM

They made a 1999 v6 foxbody? huh, thought those ended in 1993

but i would try the TPS sensor. is there a CEL?

Crashnburn110985 · January 22nd, 2012, 10:16 PM

no there is not a check engine light

Green_6er · January 22nd, 2012, 10:49 PM

are the rpm's sticking at all?

dark_horse · January 22nd, 2012, 10:56 PM

check your balancer, mine didnt look bad until i took it off, the rubber was dry rotted and the weightwas thrown off, got a new one and the shaking was gone, i have a 2000 and the 99 00 are external just to let ya know

and mine shook around the same rpm, and yeah it feels as if the thing is getting read to blow lol

Crashnburn110985 · January 22nd, 2012, 11:06 PM

Balancer? where is that?

WickedSnake00 · January 23rd, 2012, 08:40 AM

That big round crank pulley on the front.

dgt_mustang · January 23rd, 2012, 08:45 AM

wicked are you referencing the harmonic balancer? if so could the balancer do it every now and then or would it do it all the time?

OP you said you cleaned the throttle body? you didnt by chance happen to turn a screw on the TB by the Throttle cable?

WickedSnake00 · January 23rd, 2012, 08:56 AM

Originally Posted by dgt_mustang

wicked are you referencing the harmonic balancer? if so could the balancer do it every now and then or would it do it all the time?

I was just letting him know where the balancer was.

If it was very bad I could see it being constant, but if it's only slightly bad it may manifest itself in harmonics at certain frequencies.

But after re-reading it, I'm wondering about misfire. Does it feel like it's missing? You can usually hear a miss, and it causes large vibration by disturbing the natural firing frequency of the engine.

Have you checked your spark plug gap?

rafter40 · January 23rd, 2012, 09:52 AM

i just fixed a serious vibration problem yesterday. After trying like 5 other things it ended up being my harmonic balancer that fixed the problem

dgt_mustang · January 23rd, 2012, 09:52 AM

I'm curious about my own problem since you mentioned that....interesting.

dgt_mustang · January 23rd, 2012, 09:52 AM

rafter what were your symptoms?

mustangmike! · January 23rd, 2012, 01:23 PM

Originally Posted by Crashnburn110985

I have a 1999 V6 foxbody mustang 3.8, recently it had been running really hard and shaking a bit, so I change the motor mounts and now the shaking is worse! It Idles ok once it is below 1,000 rpms at 1,000 the shaking is the worst and feels like the car is gonna fall apart once it is above 1,500-2,000 rpms it normal, but it will not rev past 4,000 RPM its as if its hitting the rev limiter (my car is a manual). On top of that there is a slight knocking noise not loud but quiet and faint. I have changed:
the spark plugs
Spark plug wires
Igition coil Ive cleaned the Throttle bottle
recently I changed the Idle control valveI am lost and dont know what else to do please someone help me!

more info on those blue spots please.

And look up detonation and read about what it is.

rafter40 · January 23rd, 2012, 02:43 PM

BAD Vibration

this was very frustrating to me. hope you have better luck

Crashnburn110985 · January 23rd, 2012, 04:26 PM

Replaced TPS car still shakes and now it stalls out when you accelarate, is there anything special you need to do for the TPS its just bolt of bolt on right?

MustangV6Man? · January 23rd, 2012, 04:43 PM

Fuel filter / fuel pump?

nasty02v6 · January 23rd, 2012, 08:25 PM

Did you replace the IAC Valve before or after the vibrations started? I've put mine on backwards before and experienced "some" of your symptoms.
Like said above, check the harmonic balancer. If T5 make sure the counter-weight is still on your flywheel. If 4R70W I would suspect the converter.
Otherwise I would have to suggest something internally engine-wise, you don't even want to know those reasons.
If your shaking is as bad as it sounds, I wouldn't drive/run the car more than necessary until fixed.

mustangmike! · January 23rd, 2012, 09:08 PM

stop replacing stuff and find the problem.

And give me more details on the stuff I highlighted in blue please. will help 10x more.

January 22nd, 2012, 09:37 PM	#1
Crashnburn110985 Newbie 1999 Mustang V6 Join Date: Jul 2010 Location: Orlando Florida Posts: 14 iTrader: 0 reviews	V6 RIDICULOUS SHAKING I have a 1999 V6 foxbody mustang 3.8, recently it had been running really hard and shaking a bit, so I change the motor mounts and now the shaking is worse! It Idles ok once it is below 1,000 rpms at 1,000 the shaking is the worst and feels like the car is gonna fall apart once it is above 1,500-2,000 rpms it normal, but it will not rev past 4,000 RPM its as if its hitting the rev limiter (my car is a manual). On top of that there is a slight knocking noise not loud but quiet and faint. I have changed: the spark plugs Spark plug wires Igition coil Ive cleaned the Throttle bottle recently I changed the Idle control valve I am lost and dont know what else to do please someone help me!

January 22nd, 2012, 10:56 PM	#5
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	check your balancer, mine didnt look bad until i took it off, the rubber was dry rotted and the weightwas thrown off, got a new one and the shaking was gone, i have a 2000 and the 99 00 are external just to let ya know and mine shook around the same rpm, and yeah it feels as if the thing is getting read to blow lol __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

January 23rd, 2012, 08:40 AM	#7
WickedSnake00 MM's king of Neon's 404 - car not found 17.81@87 Join Date: Aug 2010 Location: Diesel Engine Capital of the World, Columbus, IN Posts: 7,376 iTrader: 0 reviews	That big round crank pulley on the front. __________________ Official Secondhand Snake Build Thread Here Looks Like a Cobra, Sounds Like a Cobra, Tastes Like a Cobra, Not a Cobra. For Sale: P71 Interceptor motor

January 23rd, 2012, 08:25 PM	#17
nasty02v6 Newbie 2002 Ford Mustang Join Date: Oct 2011 Location: Missouri Posts: 42 iTrader: 0 reviews	Did you replace the IAC Valve before or after the vibrations started? I've put mine on backwards before and experienced "some" of your symptoms. Like said above, check the harmonic balancer. If T5 make sure the counter-weight is still on your flywheel. If 4R70W I would suspect the converter. Otherwise I would have to suggest something internally engine-wise, you don't even want to know those reasons. If your shaking is as bad as it sounds, I wouldn't drive/run the car more than necessary until fixed. __________________ K&N CAI, MSD Wires, MAC L/T's, MAC O/R H-Pipe, Super 44's, MGW Shifter, SPEC Aluminum Flywheel, RAM HDX Clutch, FRPP Aluminum Driveshaft, 4.10's, Trac-Lok, Mach 1 17's, Nitto NT555 275's & 315's! Need Mustang help in MO? PM me!

January 23rd, 2012, 09:08 PM	#18
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	stop replacing stuff and find the problem. And give me more details on the stuff I highlighted in blue please. will help 10x more. __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

January 22nd, 2012, 10:16 PM	#3
Crashnburn110985 Newbie 1999 Mustang V6 Join Date: Jul 2010 Location: Orlando Florida Posts: 14 iTrader: 0 reviews	no there is not a check engine light

January 22nd, 2012, 11:06 PM	#6
Crashnburn110985 Newbie 1999 Mustang V6 Join Date: Jul 2010 Location: Orlando Florida Posts: 14 iTrader: 0 reviews	Balancer? where is that?

January 23rd, 2012, 09:52 AM	#10
rafter40 Regular 2000 Mustang v6 Join Date: Feb 2010 Location: NJ Posts: 227 iTrader: 0 reviews	i just fixed a serious vibration problem yesterday. After trying like 5 other things it ended up being my harmonic balancer that fixed the problem

January 23rd, 2012, 02:43 PM	#14
rafter40 Regular 2000 Mustang v6 Join Date: Feb 2010 Location: NJ Posts: 227 iTrader: 0 reviews	BAD Vibration this was very frustrating to me. hope you have better luck

January 23rd, 2012, 04:26 PM	#15
Crashnburn110985 Newbie 1999 Mustang V6 Join Date: Jul 2010 Location: Orlando Florida Posts: 14 iTrader: 0 reviews	Replaced TPS car still shakes and now it stalls out when you accelarate, is there anything special you need to do for the TPS its just bolt of bolt on right?

January 23rd, 2012, 04:43 PM	#16
MustangV6Man? Enthusiast Join Date: May 2010 Location: USA Posts: 664 iTrader: 1 reviews	Fuel filter / fuel pump?

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