More troubleshooting help needed..., this is getting not so much fun |
|
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. |
|
More troubleshooting help needed..., this is getting not so much fun |
lotus_65 |
May 8 2007, 09:42 AM
Post
#1
|
Senior Member Group: Members Posts: 1,608 Joined: 21-March 05 From: minneapolis, mn Member No.: 3,795 Region Association: Northstar Region |
'74 2056 + dual 40's, mallory + blue coil internally ballasted.
So, because I just can't get the carbs right, I had a mechanic do it. The car ran great for about 300 miles and then started missing. I have gone through ignition, tested or swapped with known working replacements and the miss remains. I tested the mallory according to the instructions here: unilite module testing. It passed all those checks. I did a fuel flow test to the carbs. flow at under 1lb is a little shy to the 3&4 side, but at 2, where I run the regulator normally it's effectively even flow. I pressurized the system and got 3lb's max (my return line is calibrated for that). Both carbs seem to be feeding fuel appropriately. I can unplug wires 1&2, and the car still idles @<300rpm. Unplugging either 3 or 4 causes the engine to die. Here's the weird part: I can almost get the idle correct by holding the plug wires on 1 & 2 about a quarter inch from the tops of the plugs. That is to say that the idle comes up momentarily, and waivers depending on if ignition gets through the plug in time. I've replaced more plugs in the last year than I'd care to admit, and I broke my CSOB plug wrench or else I would have a report on those too. I can't see how they'd go bad though. Ignition or fuel? TIA for the help! Paul 952.451.5205 |
904svo |
May 8 2007, 10:17 AM
Post
#2
|
904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
Sounds like the carburator is out of sync at idle, try turning up the idle screw in
on the carb on cylinder 1&2 if that smooth out your problem the carbs are out of sync get a Uni-sync and set the flow rate the same on both sides of the carbs at idle. |
Lo-Fi Version | Time is now: 25th September 2024 - 10:44 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 ... |