'75 1.8L Idling at 1,600 RPM -, Vacuum advance on distributor connected and... |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
'75 1.8L Idling at 1,600 RPM -, Vacuum advance on distributor connected and... |
Rick986 |
Sep 17 2021, 04:35 PM
Post
#1
|
0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest |
Had the car in for a post PI today and tech noted that the "vacuum advance" on distributor was not connected when the (previously bad) charcoal canister was removed. He teed into another vacuum line and connected the vacuum port. He noted that this will increase RPM's but will also help with acceleration.
I did notice a slight increase in acceleration but more so, the car is now idling at 1,600 RPM when warm. Seems excessive. Plus, I think that I noticed that the exhaust no longer "pops" when decelerating (which was kinda cool...yet slightly obnoxious). Thoughts? Thanks for educating this Newbie... |
wonkipop |
Sep 19 2021, 04:13 PM
Post
#2
|
Advanced Member Group: Members Posts: 4,403 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
correction mate.
i lie about the distributor vacuum advance on later 1.8s. i went to mr. bowlsby's website for you. he has some vacuum line routing diagrams for the cars there. v. useful resource. https://bowlsby.net/914/Classic/TechNotebook.htm only the 74 1.8s have both lines to the distributor directly. (though there is a variation on that with an open line from distributor that is shown in this diagram. i have the one where both run to the TB. complicated isn't it?). pretty sure this is the early one with open line, that is close to what i have and was talking about. at some point in 74 they run both lines to the TB. this is the later one, noted from about mid 74 on. but i think accurately it is the 75 model year with EGR. the vacuum line is hooked up to a T. (learn something every day - the cars constantly changed! - emissions regs?). this is joined to the later type of ex. gas recirc valve. your tech does know what he is doing if he hooked up to that T. and that explains why your exhause is not burbling anymore. they pop a bit without the decal valve and probably egr valve hooked up. the high idle is due to something else. as per suggestions above. your tech should be able to sort it out. --- if you do put the can back on there is debate about the can plumbing. some here have the view that the can is plumbed according to the diagrams on mr. b's website. others, like me, think the plumbing to the can changes when it goes into the engine bay. the explanation to me is simple. cans in the front trunk were plumbed up porches way as per 911s to 1974. cans in the engine bay were plumbed up VWs way which was always different to porsche. the discussion around that is in the link to the thread in my post above. its a bit academic. but i am sure the can works better if its plumbed to work the VW way. |
Lo-Fi Version | Time is now: 9th June 2024 - 07:08 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |