Air pump removal
#3
Electron Wrangler
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Makes room for a vacuum pump.
Its quite likely that many older 928's have a pump that doesn't pump much anymore, or a vacuum diverter valve that doesn't operate when it should anymore.
Newer cats may not need air injection and many 928s don't really need it to pass emissions anyway (and are likely in fact passing with a non-functional pump every year).
Worn pumps can get noisy...
Alan
Its quite likely that many older 928's have a pump that doesn't pump much anymore, or a vacuum diverter valve that doesn't operate when it should anymore.
Newer cats may not need air injection and many 928s don't really need it to pass emissions anyway (and are likely in fact passing with a non-functional pump every year).
Worn pumps can get noisy...
Alan
The following 2 users liked this post by Alan:
Darren nicolson (02-14-2023),
davek9 (02-14-2023)
#6
Rennlist Member
Block the hose from the pump (I don't even remember how I did this) and get the fan belt that fits needing no tensioner from crank to fan pulley.
When I rebuilt my engine I ripped all related stuff out and plugged the rear cylinder head holes with the same fittings/sealing rings used on the front.
When I rebuilt my engine I ripped all related stuff out and plugged the rear cylinder head holes with the same fittings/sealing rings used on the front.
#7
Nordschleife Master
It doesn't make noises if it's removed.
It depends on the car model as to what it does.
On my Euro S cars it simply pumps air into the exhaust and there are no cats. That's an old, crappy emissions trick. I'd be likely to leave it in place on a stock car with cats.
Removing all the pipes, hoses and the filter are benefits as well.
It depends on the car model as to what it does.
On my Euro S cars it simply pumps air into the exhaust and there are no cats. That's an old, crappy emissions trick. I'd be likely to leave it in place on a stock car with cats.
Removing all the pipes, hoses and the filter are benefits as well.
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#8
Advanced
Thread Starter
If I understand correctly, one of the hoses from the air pump goes to the cats, the other (blue one) to that bypass valve on the passenger side.
Did I miss something?
#9
Rennlist Member
There are threaded holes in the front and back of the heads.
Use the same threaded plugs as are used in the front to plug the rear holes when ripping out the plumbing.
Use the same threaded plugs as are used in the front to plug the rear holes when ripping out the plumbing.
#10
Electron Wrangler
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It depends on year as to how the air injection is plumbed. For some years its just a single pipe from the diverter to the cats to block/cap. This assumes you remove the (now no longer needed) diverter valve. If you leave the diverter valve in place you only need to plug the line feeding it.
Alan
Alan
#14
Three Wheelin'
I deleted mine because the bearings failed.
I'm also in a state with no smog testing!!!!
While I was in there I deleted the belt driven cooling fan as well, and went with electric.
There is a vacuum line that runs from throttle to diverter valve, so I would cap everything if you delete.
I'm also in a state with no smog testing!!!!
While I was in there I deleted the belt driven cooling fan as well, and went with electric.
There is a vacuum line that runs from throttle to diverter valve, so I would cap everything if you delete.