hiccup in the force, at higher rpms slight periodic burp in engine power |
|
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. |
|
hiccup in the force, at higher rpms slight periodic burp in engine power |
dlindzey |
Oct 16 2021, 08:15 PM
Post
#1
|
repeat offender Group: Members Posts: 33 Joined: 8-April 14 From: texas Member No.: 17,226 Region Association: Southwest Region |
here is the back ground-recent purchase, rebuilt 1.7 with a kit and conversion to dual webbers all before i got it. it has new cam for the webbers, fuel tank cleaned, just got new fuel pump, fuel filter is fine. arizona car (altitude) now in Texas, i don't have all the carb settings or webber model numbers.
starts fine, going through the gears for town driving no real issues but when on highway starting at 3000-3400 rpms when in steady state there is a periodic fluctuation in the power of the car. if i put it in 5th gear and roll down the highway and keep it under 3000 rpms i don't get the slight transient missed beat, hiccup or what ever. mechanic can't give me credible first approach so what does everyone out there think. most likely carb adjustment needed? coil, electronic ignition, cap, wires , plugs? work back wards and check plugs, compression/leak and then look at carbs? |
bobboinski |
Oct 16 2021, 08:44 PM
Post
#2
|
Member Group: Members Posts: 198 Joined: 23-April 16 From: Petaluma Member No.: 19,929 Region Association: Northern California |
Start with the basics. Points, plugs, cap, rotor, wires, dwell, timing,valve adjustment, vacuum leaks, fuel pressure, compression. I would do all this first, since the car is new to you. Then I would know what I was starting with. For me carbs would be last, especially given the symptom of a steady state misfire.
|
HansJan |
Oct 16 2021, 09:06 PM
Post
#3
|
Member Group: Members Posts: 395 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
When this same thing happened to me, I tinkered with the carbs/jets for a long time. Finally it was the new (123) distributor that fixed the problem
|
r_towle |
Oct 16 2021, 10:07 PM
Post
#4
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Distributor
|
Lo-Fi Version | Time is now: 19th May 2024 - 05:30 PM |
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 ... |