Good Sam Club Open Roads Forum: F53 460 Engine runs very poorly when heat soaked
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 > F53 460 Engine runs very poorly when heat soaked

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Dutch_12078

Winters south, summers north

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Posted: 10/16/21 06:45pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Sounds like it could be bad catalytic converter


The '95-'97 F53's didn't have a cat. Wasn't required...


Dutch
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enblethen

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Posted: 10/16/21 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

All vehicles that were built for MHs were built to meet California emissions.
Only way for OP to know is to look at his.
My "93 has a cat


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MT BOB

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Posted: 10/17/21 04:26am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

All vehicles that were built for MHs were built to meet California emissions.
Only way for OP to know is to look at his.
My "93 has a cat


"All F53 from 1988 to 1993 had converters. Due to cylinder head redesign and altered state of tune, all F53 from 1994 to 1997 did not have converters and met 50 states emissions requirements. The resonator on 1994 to 1997 F53 is some times mistaken for a converter. No 1998 model year F53 chassis. All F53 from 1999 to present have converters. No exceptions were made for CA."

Twomed

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Posted: 10/17/21 06:41am Link  |  Quote  |  Print  |  Notify Moderator

460 in motorhome applications was pretty famous for this. Cheap easy fix (fingers crossed for you) was to insulate the the fuel line from fuel pump to the carb. An insulating fiber riser spacer between carb and manifold could help too.


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MT BOB

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Posted: 10/17/21 06:48am Link  |  Quote  |  Print  |  Notify Moderator

Twomed wrote:

460 in motorhome applications was pretty famous for this. Cheap easy fix (fingers crossed for you) was to insulate the the fuel line from fuel pump to the carb. An insulating fiber riser spacer between carb and manifold could help too.


There is no carb on a 95.

enblethen

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Posted: 10/17/21 07:38am Link  |  Quote  |  Print  |  Notify Moderator

I would suggest that the OP physically look under his/her coach for a catalytic converter.

MEXICOWANDERER

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Posted: 10/17/21 10:34am Link  |  Quote  |  Print  |  Notify Moderator

And the Check Engine Light stays unlit?

pilotanpia

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Posted: 10/17/21 11:23am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Sounds like it could be bad catalytic converter


My F53 Motorhome is 17,000 lbs GVWR. So, no catalytic converter installed from factory. I even confirmed this myself.

* This post was edited 10/17/21 11:42am by pilotanpia *


Donald L.

pilotanpia

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Posted: 10/17/21 11:29am Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

And the Check Engine Light stays unlit?


YES. No check engine light. The CI light did come on 4 years ago when the fuel pump failed. It comes on briefly when starting then goes off once engine is running. (Normal)

RLS7201

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Posted: 10/17/21 11:50am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

All vehicles that were built for MHs were built to meet California emissions.
Only way for OP to know is to look at his.
My "93 has a cat


In 94 Ford changed cylinder heads and the state of tune which allowed the elimination of the cat to the end run of the 460 in 97.

Richard


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