 Another new guy question, diagnosing a rough running engine |
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| A Havland |
 Jan 7 2025, 05:59 PM
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#1
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Newbie  Group: Members Posts: 1 Joined: 6-December 24 From: Ventura county california Member No.: 28,501 Region Association: Southern California  |
Hello all. Finally saved up enough to get a 914. It's a 1974 2.0 in silver. I am working through a few issues. When I first got the car home it was hard to start so I did a valve adjustment and now it starts right up. The next hiccup is the engine runs very rough just above idle until it is completely warmed up. I checked the AAR valve and it seems to open when the car is cold. I took out the air sensor and it passed the olms and vacuum test. Replaced the plugs but the old ones looked good. Light grey in color. I could use some help if anyone knows where the two wires in the white connector goes. This is all new to me and the learning curve is steep (at least in the beginning). Any help would be appreciated. Thanks.
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| 914sgofast2 |
Jan 8 2025, 02:59 PM
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#2
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Senior Member Group: Members Posts: 660 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
The vacuum advance hose is clearly missing from the nipple on the distributor. There needs to be a vacuum hose from the nipple on the vacuum advance diaphragm connecting to a nipple on the intake plenum. Without it, you car will run, but with "flat spots" where it seems to lose power briefly.
I think others have answered your question about the electrical connector that has come off its position. |
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| emerygt350 |
Jan 8 2025, 03:58 PM
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#3
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Advanced Member Group: Members Posts: 2,537 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
QUOTE(914sgofast2 @ Jan 8 2025, 03:59 PM)  The vacuum advance hose is clearly missing from the nipple on the distributor. There needs to be a vacuum hose from the nipple on the vacuum advance diaphragm connecting to a nipple on the intake plenum. Without it, you car will run, but with "flat spots" where it seems to lose power briefly. I think others have answered your question about the electrical connector that has come off its position. This is a 74 so it may just have the retard part of the circuit. That other hose on the vacuum can on the distributor should be headed to the back side of the throttle body, the advance would go to the TB port pointing towards the passenger seat, but late 74s did not have that (mostly, I think). also, just fyi, advance has to go to ported vacuum, not the plenum, or bad things happen. |
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Posts in this topic
A Havland Another new guy question Jan 7 2025, 05:59 PM
Superhawk996 :wttc:
Not sure why no one has replied to this t... Jan 8 2025, 08:44 AM Cairo94507 :wttc: Welcome to the club. If you have not alrea... Jan 8 2025, 08:59 AM JeffBowlsby Welcome to 914s! :wttc:
Here are a few link... Jan 8 2025, 09:38 AM
Superhawk996
Here are a few links to a couple pertinent diagr... Jan 8 2025, 09:58 AM Superhawk996 Oh, oh, . . .
Now I wanna’ change my answer; ... Jan 8 2025, 09:48 AM emerygt350 definitely ts1 just south of the TPS mounted into ... Jan 8 2025, 10:59 AM Dave_Darling There needs to be a vacuum hose from the nipple o... Jan 9 2025, 12:29 AM yellowporky From what i have experience with my D-jet car is t... Jan 8 2025, 03:05 PM |
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