924Board.org

Ron B · Joined: 19 May 2014 Posts: 102 Location: Delaware

I'm planning on removing the EGR and Air injection systems and was wondering what if anything has to stay in order for everything to run properly, and if you have any tips.

What are the minimum vacuum lines needed. I know the most of the vacuum lines on this car are for the EGR and Air injection system but with those removed what's needed? I know you need the vacuum advance line from distributer to throttle body. What other lines are required.

Thanks, Ron

!tom · Posted: Sun Jul 13, 2014 7:05 am Post subject:

This is on my to-do list:

http://924board.org/viewtopic.php?p=248237
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78 924 NA
5-lug

Ron B · Joined: 19 May 2014 Posts: 102 Location: Delaware

The picture is no longer available, could you explain what I is you did please.
thanks

!tom · Posted: Sun Jul 13, 2014 12:35 pm Post subject:

Uh oh!

I never saved a copy.
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78 924 NA
5-lug

Ron B · Joined: 19 May 2014 Posts: 102 Location: Delaware

Ah that's to bad, can you describe how yours is?

Going over everything the only vacuum lines that are left once the smog stuff is removed are one from the throttle body to the distributer for vacuum advance, and one from the brake booster to the deceleration valve.

I don't see anything else, hopefully someone can confirm this.

On another note I have read different views on the need for the deceleration valve at all, on the plus side you get faster throttle/rpm response and a more stable idle, on the minus side I have read that some experience popping and backfire from sudden throttle release during shifting.

I'd be interested in what the guys have to say that have removed it.

Thanks, Ron

!tom · Posted: Mon Jul 14, 2014 9:40 am Post subject:

My decel valve has been defeated. With it connected it takes around a minute to come down to idle.

Must be something wrong with it, but there are no ill effects with it disconnected.
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78 924 NA
5-lug

Slam · Posted: Tue Jul 15, 2014 1:29 am Post subject:

Minimum vac lines to retain are distributor advance, brake booster and engine breather. All else can go. When I owned my 84 Euro, that's all there was.

Hit up the Aussie owners for info, too, as they have ROW cars and you can model your vac system after theirs.
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'84 944 - kid blew motor
'83 944 - resting comfortably. For 12 years
'87 944 - sideswiped by trucker
'80 924 - gone
'78 924 - gone
'77 924 - rusting comfortably

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

porsche_reg · Joined: 19 Jun 2016 Posts: 62 Location: Boise, Idaho

anything new on this post? I'm looking at a EGR delete plate (hoses all busted up). Or I'm going to get some new hose and the connector pieces and hook back up.
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Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback

!tom · Posted: Thu Nov 22, 2018 7:54 am Post subject:

When I replaced my exhaust with one from someone else on this board, the new exhaust had the EGR pipe deleted from the downpipe.

I just blocked off my EGR on the intake manifold, and all's good...
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78 924 NA
5-lug

porsche_reg · Joined: 19 Jun 2016 Posts: 62 Location: Boise, Idaho

thanks tom, I removed the line, and capped off both sides. It wasn't hooked up before, so there no difference.
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Prev: '81 BMW 320i
'05 997.1 C2
Current: '79 924 n/a (family owned since new)
'12 Subaru Outback