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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Throttle Body Confusion

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psalm10720

Clearwater, FL

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Posted: 05/31/18 06:24pm Link  |  Quote  |  Print  |  Notify Moderator

I only posted this as an update. I have a plan. I know what the problem is am and dealing with it. Thanks. You

Stim

NE Florida

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Posted: 05/31/18 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

TBI's are dirt dumb simple.
I still have one in my shop attic from over 20 years ago.
Guess I should put it on ebay. ???
It was common for the fuel pressure regulator in the TBI to get weak and they are cheap/easy to change. TBI has a supply and return line.
As stated, fuel pump maybe and/or frame filter.

enblethen

Moses Lake, WA

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Posted: 05/31/18 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

psalm10720:
What is your plan? It would be interesting to know!


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77rollalong

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Posted: 06/01/18 04:25am Link  |  Quote  |  Print  |  Notify Moderator

the early GM fuel injection was really simple, have had a few with a stuck injector that just stream fuel without the engine running, few with fuel pressure regulator leaking back too much, quit a few that the MAP sensor fails, which in most cases will throw a code. pulling codes off the GM obd1 systems you just need a paper clip to jumper two pins on the obd port, then read the check engine light in the light flashes like morse code.

psalm10720

Clearwater, FL

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Posted: 06/01/18 04:28am Link  |  Quote  |  Print  |  Notify Moderator

When am able taking throttle body to well-respected Tampa area Carb shop for a rebuild. They do an entire rebuild for $399.00

enblethen

Moses Lake, WA

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Posted: 06/01/18 07:14am Link  |  Quote  |  Print  |  Notify Moderator

Let us know how it goes!
Maybe information will help others.

RLS7201

Beautyful Downtown Gladstone, MO

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Posted: 06/01/18 10:24am Link  |  Quote  |  Print  |  Notify Moderator

psalm10720 wrote:

It’s a P30 chasis not P32. I only come in a short time each month. Situation is ok. Will post if I need assistance. Case closed.


Actually the general public has been misnaming the P32 chassis for years. The P30 chassis is a commercial chassis where as the RV chassis is really a P32 chassis. But it's irrelevant, calling your chassis a P30 will get you the correct parts most of the time.

When GM made the motorhome chassis it was initially designated a P32 and was never really officially recognized as a P30 except for ease of conversation and convenience.

Most publications, people and marketing types simply dropped off the "2" and the chassis became more commonly known in speech and print as a P30.

The differences in between the P series is blurred and to a GM engineer there wasn't any difference between a motorhome chassis whether it is spoken about as a 30 or a 32 it was simply recognized as a P series.

When WCC got the product the marketing efforts and literature pointed to a P32 Wide-Track designation however in reality to the technician types it was simply a P Series. Later we see the chassis guides dropping or never having mentioned 30 or 32 and simply describing the product as a P series.

Now please don't introduce any other model types into the mix because the P32 was designed to be a motorhome chassis as opposed to a commercial product. I understand that the placement of the steering wheel column is the biggest difference between a P30 commercial and a P32 motorhome chassis.


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theoldwizard1

SE MI

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Posted: 06/01/18 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

Stim wrote:

It was common for the fuel pressure regulator in the TBI to get weak and they are cheap/easy to change. TBI has a supply and return line.
As stated, fuel pump maybe and/or frame filter.

Concur !

theoldwizard1

SE MI

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Posted: 06/01/18 07:18pm Link  |  Quote  |  Print  |  Notify Moderator

psalm10720 wrote:

When am able taking throttle body to well-respected Tampa area Carb shop for a rebuild. They do an entire rebuild for $399.00

If it is a standard GM TBI, that is a rip off !

As Stim said, TBI is "dirt, dumb simple".

udidwht

Seattle

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Posted: 06/06/18 11:11am Link  |  Quote  |  Print  |  Notify Moderator

Stim wrote:

TBI's are dirt dumb simple.
I still have one in my shop attic from over 20 years ago.
Guess I should put it on ebay. ???
It was common for the fuel pressure regulator in the TBI to get weak and they are cheap/easy to change. TBI has a supply and return line.
As stated, fuel pump maybe and/or frame filter.


Yes they are easy to replace (regulator). Ones biggest worry in that job? Dropping one of the bolts down the TBI throat while disassembling or reassembling it.

Take your time and more importantly carefully fold Scott's towell or such over the TBI throats before working on it.

Those regulator diaphragms are made of Viton and do not fail often and generally do not strand one. There really isn't much to rebuilding one given the kit is primarily made up of seals. I've rebuilt them without even taking the TBI off the intake. It can be done if your certain the intake manifold gasket is good.

As long as one makes it a good habit to replace the fuel filter every 15k the TBI will live a long life. Likely longer than the owner.


1994 Fleetwood Southwind Storm
P-30 chassis 7.4L 454 TBI 56,4XX miles and counting....
VIN# 1GBJP37N4R3314754

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