Jumpiness - 2003-04 Mach 1 Registry Owners Club

Castillo830 · 08-15-2008, 01:32 PM

Whenever I'm driving at lower gears (1 and 2) and I let go or ease off the gas too much my car jumps. I'm still in gear and everything and I have no idea why it does that? Any help anybody.

dlandry427 · 08-15-2008, 01:39 PM

Not enough revs for the gear you're in? What do you mean jumps? Like it lurches forward and the engine struggles?

Castillo830 · 08-15-2008, 01:48 PM

Nah, it's not like the engine isn't getting enough power it just lurches forward. Pretty nasty too. Like I always wonder if anyone can see it.

dlandry427 · 08-15-2008, 01:51 PM

I had a rear main seal leak in my 66 that caused the same thing. Oil would build up on the clutch and it would slip and then grab suddenly & only in 1st. Not saying that is what your problem is, but if your saying the engine does'nt struggle, I would guess something with the clutch.

Castillo830 · 08-15-2008, 01:57 PM

Yeah, because the RPM's don't drop or anything. The car just lurches forward.

birdman941 · 08-15-2008, 02:04 PM

Driveline slop.

04azuremach · 08-15-2008, 02:15 PM

Quote:

Originally Posted by birdman941

Driveline slop.

sideways03 · 08-15-2008, 02:17 PM

Quote:

Originally Posted by birdman941

Driveline slop.

+1

Mine was doing that. It was because the pinion nut had backed off and made the pinion shaft loose.

Castillo830 · 08-15-2008, 03:20 PM

I see, so how do I fix that?

birdman941 · 08-15-2008, 06:12 PM

Check the motor mounts and trans mount.
Rear suspension/control arm bushings
Excessive play in rear end gear

Castillo830 · 08-15-2008, 08:45 PM

Ok, thanks. Those mounts, can I get to them from the bottom of my car?

birdman941 · 08-15-2008, 08:59 PM

Yes.

08-15-2008, 01:32 PM	#1
Castillo830 Registered User Join Date: Apr 2008 Location: Texas Posts: 66	Jumpiness Whenever I'm driving at lower gears (1 and 2) and I let go or ease off the gas too much my car jumps. I'm still in gear and everything and I have no idea why it does that? Any help anybody. __________________ JLT RAI

08-15-2008, 01:39 PM	#2
dlandry427 Charles U. Farley Join Date: Jun 2006 Posts: 1,112	Re: Jumpiness Not enough revs for the gear you're in? What do you mean jumps? Like it lurches forward and the engine struggles? __________________ *En tequila es verdad*.

08-15-2008, 01:48 PM	#3
Castillo830 Registered User Join Date: Apr 2008 Location: Texas Posts: 66	Re: Jumpiness Nah, it's not like the engine isn't getting enough power it just lurches forward. Pretty nasty too. Like I always wonder if anyone can see it. __________________ JLT RAI

08-15-2008, 01:51 PM	#4
dlandry427 Charles U. Farley Join Date: Jun 2006 Posts: 1,112	Re: Jumpiness I had a rear main seal leak in my 66 that caused the same thing. Oil would build up on the clutch and it would slip and then grab suddenly & only in 1st. Not saying that is what your problem is, but if your saying the engine does'nt struggle, I would guess something with the clutch. __________________ *En tequila es verdad*.

08-15-2008, 01:57 PM	#5
Castillo830 Registered User Join Date: Apr 2008 Location: Texas Posts: 66	Re: Jumpiness Yeah, because the RPM's don't drop or anything. The car just lurches forward. __________________ JLT RAI

08-15-2008, 02:04 PM	#6
birdman941 Torque wins! Join Date: Dec 2004 Location: Florida Posts: 13,167	Re: Jumpiness Driveline slop. __________________ The ORIGINAL Project R build thread is back ! 5.4 32V NA Streetable 404/387 26.56 MPG "I don't like repeat offenders, I like DEAD offenders" Ted Nugent "A big engine hardly working is more efficient than a little engine screaming its head off" Jay Leno

08-15-2008, 03:20 PM	#9
Castillo830 Registered User Join Date: Apr 2008 Location: Texas Posts: 66	Re: Jumpiness I see, so how do I fix that? __________________ JLT RAI

08-15-2008, 06:12 PM	#10
birdman941 Torque wins! Join Date: Dec 2004 Location: Florida Posts: 13,167	Re: Jumpiness Check the motor mounts and trans mount. Rear suspension/control arm bushings Excessive play in rear end gear __________________ The ORIGINAL Project R build thread is back ! 5.4 32V NA Streetable 404/387 26.56 MPG "I don't like repeat offenders, I like DEAD offenders" Ted Nugent "A big engine hardly working is more efficient than a little engine screaming its head off" Jay Leno

08-15-2008, 08:45 PM	#11
Castillo830 Registered User Join Date: Apr 2008 Location: Texas Posts: 66	Re: Jumpiness Ok, thanks. Those mounts, can I get to them from the bottom of my car? __________________ JLT RAI

08-15-2008, 08:59 PM	#12
birdman941 Torque wins! Join Date: Dec 2004 Location: Florida Posts: 13,167	Re: Jumpiness Yes. __________________ The ORIGINAL Project R build thread is back ! 5.4 32V NA Streetable 404/387 26.56 MPG "I don't like repeat offenders, I like DEAD offenders" Ted Nugent "A big engine hardly working is more efficient than a little engine screaming its head off" Jay Leno

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