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Old 01-01-2006, 08:01   #1 (permalink)
rottyguy70@yahoo.com
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can an exhaust leak cause sputtering?

hello,

I recently replaced my entire exhaust system (cat & all) on my 92 ford
f150 (6 cyl). Upon a test run, I noticed that the car, on
acceleration, sputters and rumbles profusely (1st gear seems ok, 2nd &
3rd are problemmatic). Could this be a result of something with the
exhaust system? It was ok prior to the change though it has been
sitting idle outside for several months now as well.

thx

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Old 01-01-2006, 10:01   #2 (permalink)
rottyguy70@yahoo.com
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Re: can an exhaust leak cause sputtering?

Just took her out for a spin. It's actually a vibration issue. She
always had some vibrations (that has gotten worse through the years)
but it's much worse now with the new exhaust system. It happens on
acceleration and high speeds (even with the clutch engaged). tranny
seems to rumble/grind as well.

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Old 01-01-2006, 14:01   #3 (permalink)
ShoeSaleman
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Re: can an exhaust leak cause sputtering?

rottyguy70@yahoo.com wrote:
> Just took her out for a spin. It's actually a vibration issue. She
> always had some vibrations (that has gotten worse through the years)
> but it's much worse now with the new exhaust system. It happens on
> acceleration and high speeds (even with the clutch engaged). tranny
> seems to rumble/grind as well.
>

Check and make sure your new exhaust isnt hitting something and it
should be on rubber hangers.
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Old 01-01-2006, 19:01   #4 (permalink)
Rodan
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Re: can an exhaust leak cause sputtering?

rottyguy70@yahoo.com wrote:

Just took her out for a spin. It's actually a vibration issue. She
always had some vibrations (that has gotten worse through the years)
but it's much worse now with the new exhaust system. It happens on
acceleration and high speeds (even with the clutch engaged). tranny
seems to rumble/grind as well.
_________________________________________

Sputtering under high manifold pressure conditions
(acceleration, high speed running) is often due to
high voltage breakdown; spark plugs, plug wires,
coil or distributor cap.

Good luck.

Rodan.
__________________________________________


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Old 01-01-2006, 20:01   #5 (permalink)
Rodan
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Re: can an exhaust leak cause sputtering?

rottyguy70@yahoo.com wrote:

Just took her out for a spin. It's actually a vibration issue. She
always had some vibrations (that has gotten worse through the years)
but it's much worse now with the new exhaust system. It happens on
acceleration and high speeds (even with the clutch engaged). tranny
seems to rumble/grind as well.
_________________________________________

Sputtering under high manifold pressure conditions
(acceleration, high speed running) is often due to
high voltage breakdown; spark plugs, plug wires,
coil or distributor cap.

Vibration under high manifold pressure conditions
(acceleration, high speed running) is often due to
a worn universal joint in the driveline.

Good luck.

Rodan.
__________________________________________



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Old 01-01-2006, 23:01   #6 (permalink)
rottyguy70@yahoo.com
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Re: can an exhaust leak cause sputtering?

Hi Rodan, is a u-joint replacement better left to a shop to fix?

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Old 01-02-2006, 02:01   #7 (permalink)
ShoeSaleman
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Re: can an exhaust leak cause sputtering?

rottyguy70@yahoo.com wrote:
> Hi Rodan, is a u-joint replacement better left to a shop to fix?
>

Didn't you say it vibrates after you changed the exhaust? What does the
exhaust have to do with u-joints? It REALLY sounds like the exhaust is
probably hitting something.
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Old 01-02-2006, 07:01   #8 (permalink)
Backyard Mechanic
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Re: can an exhaust leak cause sputtering?

"Rodan" <Rodan@verizon.NOT> wrote:

> rottyguy70@yahoo.com wrote:
>
> Just took her out for a spin. It's actually a vibration issue. She
> always had some vibrations (that has gotten worse through the years)
> but it's much worse now with the new exhaust system. It happens on
> acceleration and high speeds (even with the clutch engaged). tranny
> seems to rumble/grind as well.
> _________________________________________
>
> Sputtering under high manifold pressure conditions
> (acceleration, high speed running) is often due to
> high voltage breakdown; spark plugs, plug wires,
> coil or distributor cap.
>
> Vibration under high manifold pressure conditions
> (acceleration, high speed running) is often due to
> a worn universal joint in the driveline.
>


Check for broken engine mount, as well.

--
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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Old 01-02-2006, 10:01   #9 (permalink)
rottyguy70@yahoo.com
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Re: can an exhaust leak cause sputtering?

The truck is old and am not sure when the u-joints were last replaced.
It indeed was rattling a little prior to the exhaust replacement but it
is much more pronounced now. the new exhaust is hung correctly but
there are two issues i'm unsure of:

1) a bolt broke on the header when the old system was removed. the
bugger was so wedged in that it had to be drilled just to get another
smaller bolt/nut through. if there were a weakness in the binding, it
may be here as the new bolt is smaller and uses a hex nut/washers for
tightening.

2) the old system had the thermactor welded directly to the exhaust
pipe. the new system has no such provision aside from an air tube
welded to the cat. i piped the old thermactor via a series of rubber
tubes to this air nozzle. the nozzle on the cat is a bit smaller then
the air tube thus i'm unsure if enough air flow is allowed for the
system to work correctly.

Also, to your point I may need to attach this loose set of thermactor
connectors to the frame as it's currently just dangling.

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