Anyone know what this is and what it does?

[SparkyDuke]

Guys, I now have what i can only describe as a low tone hum coming from my transit. It seems to be emanating form what looks like an old stop cock

20260311_125801.jpg

I have looked online and I can not find this thing anywhere or see it attached to any other Pinto EFI 2.0 I have looked at online, any one know what it is? Do i need it? and how can I stop it from humming?

It seems to be connected to the air filtering system

Transit Mini Bus 1992 2.0 Pinto EFI

Cheers

[metalworker0]

dont know, looked extensively,

may help if you put the numbers it has on it , into a google search

some sort of one way breather valve i'll expect

all the best.mark

[andz327]

like metal mark suggests use the part number off it as it's a genuine part and google it
are you sure the noise not coming from the split on the top pipe in pic

Sent from my SM-G990B using Tapatalk

[bortaf]

looks like an oil seperator in the breather pipe ?
not seen one before but then most transits by 92 were twinks not pintos, there were a few 92 mods to pintos like knock sensors and the 202 block with missing core plugs ect so there were late revisions going on but rare in the UK.
the pinto Efi sufferd with oil gumming on the throttle plate so might be a late revision to prevent that, Ford did change the main inlet air feed pipe a few times to stop the oil filler cap breather from gumming up the throttle plate ?

[SparkyDuke]

Hi guys sorry for the delay in responding, work taking priority, unfortunately, roll on retirement .

I managed to get the numbers off the stop cock , but even this resulted in next to no additional info, I still dont know what it is... an air filter possibly.

Part Number: DOX1A 92 HF9G427AA

If anyone can shed some light would be good.

As for the noise, still there and andz, thats was not a split it was a glue smear did look like a split in the pic though.

On another note, had the MOT done the other day and was interested in what the emissions were gonna be after replacing the CAT.
Even the tester was surprised, the reading came back with 0.0 emissions, yep 0.0, he suggested that the van was cleaner than most ULEZ cars out there.

Is that even possible?

Anyway a happy bunny knowing I am making a difference and saving the planet

Sparky

[metalworker0]

https://rrr.lt/en/used-part/jan72891-g5 ... m-air-tank

https://rrr.lt/en/used-part/jan72889-g5 ... m-air-tank

vacuum tank .. means its a storage vessel for the vacuum - for the heater controls perhaps?

that's it there are more letter and number codes on that site .. no ford 7 digit part number .. but the other codes may lead you to that


all the best.mark

[SparkyDuke]

Cheers Mark, you actually found something, impressive.

Mine is connected directly to the air filter box and then off to the exhaust manifold (see pic, this is before I did any work on the van).

Filter.png

I don't think i can order from here directly as they only deliver within the EU, but will try and contact them to see what they can do.
I haven't seen one anywhere else unfortunately.

Sparky

[metalworker0]

exhaust manifold

... are you sure you don't mean inlet manifold

all the best ....mark

[SparkyDuke]

Mark, the pipe goes over the inlet into a split pipe setup that is connected to the exhaust manifold.

Filter2.png

To be honest I am yet to see a engine setup like mine, a lot of pipes all over the place.

Ill take a better pic when i next visit the garage.

[metalworker0]

weird .. who would connect a rubber pipe to the exhaust

when an EGR is connected, its with metal pipes

ive not a clue what it is

all the best.mark

[SparkyDuke]

Mark, here are some other pics from the exhaust manifold side.

The pipe splits into two and connects to this unit;

20260325_111338.jpg

This then feeds four metal pipes that feed directly into the exhaust manifold (i assume this is the EGR you were referring too):

20260325_111459.jpg

The part number for the unit is: 92HF9L471AE, searching this also does not lead anywhere?

[SparkyDuke]

Did more of an AI in depth search and come up with this, which i think confirms what you were suggesting:

Based on your description, you are looking at the Pulsair (Secondary Air Injection) System.
This is an emissions control system used on the 2.0L Pinto EFI (NCA) engine during the early '90s to help the catalytic converter work more efficiently during cold starts.

How Your Pulsair System Works
1. Air Source: Fresh air is drawn from the air filter box.
2. Round Filter: The "round filter" you see is a silencer and primary filter for the secondary air system. Its job is to quiet the pulsing noise of the air being sucked into the exhaust.
3. The Split: The pipe then splits into two, feeding two one-way check valves (often called "Pulsair valves").
4. Exhaust Connection: These valves allow fresh air to be sucked into the exhaust manifold by using the natural pressure pulses of the exhaust gases (the "passive" method). This oxygen helps burn off any unburnt fuel before it hits the catalytic converter.

Common Issues with This System
* The "Puffing" Sound: If those one-way valves fail, exhaust gases can blow backwards into that round filter and the air box. You will hear a distinct "chuffing" or puffing sound from the air intake.
* Melting Hoses: If the check valves fail, the extreme heat from the exhaust manifold will eventually melt the rubber hoses you described.
* Rough Idle: While this system is separate from the intake vacuum, a leak in the hoses connecting to the exhaust manifold can sometimes cause a "ticking" sound that mimics a blowing exhaust gasket or a noisy tappet.

Replacement Parts
Since these are specific to the 1991 NCA engine, finding original Ford pre-formed hoses can be difficult. Most owners replace the rubber sections with high-temperature reinforced heater hose or silicone hose that can withstand the heat near the manifold.

[metalworker0]

yes understand now , clever .

hope your two pulsair valves are good .. otherwise you'il be looking for them too

all i can do is explain how i find things

i break apart the letters and numbers into blocks and also put the word ford in the search.

so far this is what i have .. see below.. i will try harder later on .. i am working on it.

AI Overview
Based on the search results, there is no direct, specific product match listed as "92HF9L471AE" in the provided Ford parts information.
However, the number structure (XXHF-9L471-AE) strongly indicates it is a Ford Engineering/Part Number related to:
Engineering Prefix: "92HF" suggests a part design originating in the early 1990s (92 = 1992, H = General Parts/Small Car/Commercial, F = European Operations).
Base Number 9L471: This base number in the Ford parts system typically refers to emission-related components, specifically items like an Air Pump, Secondary Air Injection System bracket, or related emissions vacuum equipment.
Due to the age (1992), this part is likely for older European Ford models (e.g., Transit, Escort, Sierra, Mondeo) and may be obsolete or replaced by newer part numbers.
To confirm, please check for a base number (e.g., 9L471) and the engineering prefix (e.g., 92HF) on the actual part.

all the best.mark

[metalworker0]

we are getting closer

https://partsouq.com/en/catalog/genuine ... mOZ_tOvE0s

[metalworker0]

is this it ?

https://www.ebay.com/itm/134364272929

if so part number 6153319

all the best...mark