 Vacuum Hose Disconnected from Distributor, Does it effect engine performance? |
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| munkmunk |
 Jan 22 2005, 01:15 AM
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#1
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Newbie  Group: Members Posts: 23 Joined: 13-October 04 From: San Francisco, CA Member No.: 2,947  |
The vacuum hose that goes from my distributor (in my '74 2.0) to the throttle body, is missing. Is it required? What's the purpose of this hose? Must adjust the timing somehow? If I replace the hose, what impact will it have on how my engine is running?
Steve |
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| McMark |
Jan 22 2005, 01:58 AM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
That engine should have a vacuum retard line. It should affect idle only. Install it. It connects to the vacuum port that points toward the distributor body, not the one that points away.
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| Mike D. |
Jan 22 2005, 02:22 AM
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#3
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OK, It runs now, and pretty good too! Group: Members Posts: 1,445 Joined: 3-January 03 From: Santa Clarita, Ca Member No.: 85 Region Association: None 
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(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) And for '74 there shouldn't be a port on the throttle body for a hose. (like '73) if you have one it would be sucking air and you'd have a high idle. -Mike D. |
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| DJsRepS |
Jan 22 2005, 04:28 AM
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#4
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Member Group: Members Posts: 431 Joined: 4-November 04 From: Sarasota Florida Member No.: 3,060 |
Put a hand vac pump to see if the part is good. Mine leaked on this test and had to be replaced.
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| munkmunk |
Jan 22 2005, 11:07 AM
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#5
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Newbie Group: Members Posts: 23 Joined: 13-October 04 From: San Francisco, CA Member No.: 2,947 |
Hmm...so if a '74 doesn't have a vacuum port on the throttle body to connect to the distributor, do I just leave it the way it is? If the port is there, I'll reconnect it.
Would this cause my idle to move up and down when is the engine first started and is warming up? Steve |
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| Bleyseng |
Jan 22 2005, 11:13 AM
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#6
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
No, that is lean hunt caused by a vacuum leaks in the hoses or worn out injector seals.
Geoff |
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| munkmunk |
Jan 22 2005, 01:45 PM
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#7
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Newbie Group: Members Posts: 23 Joined: 13-October 04 From: San Francisco, CA Member No.: 2,947 |
Thanks. So which vacuum hoses are the usual culprits for "lean hunting"? Just replace all the vacuum hoses connected to the throttle body and other fuel injection parts? MPS, etc..? Steve |
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| McMark |
Jan 22 2005, 02:29 PM
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#8
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
For peace of mind, replace all hoses. For peace of mind plus bonus points, replace all the hoses with real metric lines (not SAE).
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