| Author |
Message |
Joel Ames (James)
New member
Username: James
Post Number: 41
Registered: 4-2001
| | Posted on Saturday, August 17, 2002 - 10:15 pm: | |
Steve, I guess you haven't seen my eyebrows. Thanks for the tip |
Joel Ames (James)
New member
Username: James
Post Number: 40
Registered: 4-2001
| | Posted on Saturday, August 17, 2002 - 10:14 pm: | |
Mitchell, Hi how are you. I simply resynced the carbs. I just reset all carbs 4 weeks ago and when I put my flow meter on the carbs I could not believe the difference between them all. I know I had them right when I reset them 4 weeks ago. Some screws must have moved. I hope this is what happened because I would hate to think that I am that bad of a mechanic. Have a great day. |
Mitchell Minh Le (Yelcab1)
Member
Username: Yelcab1
Post Number: 288
Registered: 11-2001
| | Posted on Friday, August 16, 2002 - 7:34 pm: | |
So Joel
What did you end up doing to solve the problem? Resynch the carbs and replace the weak springs?
|
Steve (Steve)
Junior Member
Username: Steve
Post Number: 194
Registered: 2-2001
| | Posted on Friday, August 16, 2002 - 7:12 pm: | |
Joel just a quick note here. When you look into the carbs use a mirror on an angle . I've seen a few people get burned when the carb backfires as they are looking down the barrels. |
Joel Ames (James)
New member
Username: James
Post Number: 39
Registered: 4-2001
| | Posted on Friday, August 16, 2002 - 6:36 pm: | |
Mr Magnusson and Mr Numan, You are both right. After getting a some time too look(single parent) I found that the carbs were really out of sink. More air was geting in on the two carbs that were wet drawing more fuel. The springs that hold the linkage adj. screws didn't do their job. Thank you for your help. May the Ferrari Gods bless you and keep you running. Joel. |
Paul Newman (Newman)
Member
Username: Newman
Post Number: 337
Registered: 12-2001
| | Posted on Friday, August 16, 2002 - 6:18 pm: | |
I had the same problem this summer. Some dripped from the nozzels and if I placed my finger on the pump lever to apply pressure, the drip stopped and this was causing tuning headaches as well as a fast idle. I rebalanced the carbs by reducing throttle angle and bringing up the air flow with the bypass screws. I made sure the levers werent on the start of the pump ramps. Another thing that you can consider that I had to do to one pump cam is to remove some material to unload the pump stopping the drip. They are plastic and a points file is what I used. The floats were checked twice and are bang on yet I had this problem. This corrected it. I dont know why it was doing it but its fixed now. |
Bill Sebestyen (Bill308)
Member
Username: Bill308
Post Number: 315
Registered: 5-2001
| | Posted on Friday, August 16, 2002 - 4:34 pm: | |
If you're leaking fuel from the pump jets at idle I'd suspect the fuel level is too high. This could be cased by the float needle valve not sealing, the floats are set for too high a fuel level (should be 48 mm when just seated, or the fuel pressure is too high ( should be 3-4 psi for Webers). |
Mitchell Minh Le (Yelcab1)
Member
Username: Yelcab1
Post Number: 284
Registered: 11-2001
| | Posted on Friday, August 16, 2002 - 11:49 am: | |
I had the same problem before and do not know what the causes are. I say some fuel dripping out of the acc pump at idel too. I am nearing the end of the rebuild project and will see what happens next. The engine is rebuilt, the distributors are rebuilt (there was a lot of gunk inside), the carbs are rebuilt and float levels all checked. We'll see. Joel, if you find that exact cause, let me know what it is. |
Robert Moore (Nail_it)
New member
Username: Nail_it
Post Number: 7
Registered: 6-2002
| | Posted on Friday, August 16, 2002 - 11:39 am: | |
More than likely it's the float levels. A quick test is to start the pump and look in each carb for any fuel leakage. "BE QUICK" are may be have some one to help. If tha float valves are not seating you will dump a lot of fuel in a short time. If no fuel is dripping with the engine off then the next place to look is at the cold start valves, if one are more are not completly closed the fule-mixture added below the throttle plate will increas the RPM and with the higher air flow it may pull fuel through the pump nozzies. |
Joel Ames (James)
New member
Username: James
Post Number: 38
Registered: 4-2001
| | Posted on Friday, August 16, 2002 - 11:30 am: | |
Thanks for your responses. Let me give you a bit more info. The two carbs doing this are on different banks and they were backfireing quite a bit. Actually spitting fuel out the throat. I am quite sure there is fuel going in the carb that is not supposed to be there. All carbs were rebuilt last winter.Distributors disassembled, cleaned and greased last winter. Timing is correct and I synced the carbs 4 weeks ago. Thanks. |
David Jones (Dave)
Junior Member
Username: Dave
Post Number: 232
Registered: 4-2001
| | Posted on Friday, August 16, 2002 - 11:12 am: | |
Hi Joel, I think the number one cause of high idle speed is a floor matte pushed up to the gas pedal... But, Just a thought, You might look on ebay, I bought a Weber rebuild kit for my 308 for around $60.00 U.S. from a guy in Germany.
|
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 927
Registered: 1-2001
| | Posted on Friday, August 16, 2002 - 11:05 am: | |
Joel -- Just adding extra fuel really can't change the idle RPM much without also adding extra air (but it probably wouldn't hurt to check/refresh your acc. pump diaphragms). IMO 2 possible sources for your problem:
1. throttle plates not closing properly at idle (carpet in the footbox, linkage binding, etc.).
or
2. your distributor advance mechanism(s) is (are) sticking and giving too much advance at idle. |
Joel Ames (James)
New member
Username: James
Post Number: 37
Registered: 4-2001
| | Posted on Friday, August 16, 2002 - 10:53 am: | |
After my car has run so fine for so many months the idle speed jumped up to about 1800 RPM. Takeing everything off to get to the carbs, I started the car and looked down the carb throats. On two of the carbs there is fuel dripping off the accelerator pump nozzles at idle. Increasing the RPM slightly and holding it there is much more leakage. The other two carbs are dry. Anybody seen this before? There are many post about not being able to get proper idle speed. Could this be the culprit? Any thoughts would be awsome. Thanks. |