| Author |
Message |
magoo (Magoo)
Intermediate Member
Username: Magoo
Post Number: 2222
Registered: 2-2001
| | Posted on Tuesday, April 02, 2002 - 9:41 pm: | |
Jerry, Did you ever find out the backfireing and cutoff problem? |
Greg Rodgers (Joechristmas)
Junior Member
Username: Joechristmas
Post Number: 178
Registered: 3-2001
| | Posted on Friday, March 29, 2002 - 5:20 am: | |
I think that you are having a problem fully opening your low rpm set of points. The part of the point that the lobe rotates around is probably warm. What will happen is when it is gone and stuck closed is the car will backfire and when you get to a stop it will stall. |
Bob Campen (Bob308gts)
Junior Member
Username: Bob308gts
Post Number: 88
Registered: 9-2001
| | Posted on Thursday, March 28, 2002 - 9:10 pm: | |
With the stock points setup, at idle timing is retarded 4 degrees when the switch on carb 1/2 opens the timing now should be at 16 degree advance. Total advance should be 34 degrees at 3000 RPM. Timing and the switch is the first thing I would check. |
magoo (Magoo)
Intermediate Member
Username: Magoo
Post Number: 2172
Registered: 2-2001
| | Posted on Thursday, March 28, 2002 - 8:43 pm: | |
Jerry, On the 79 308 GTS, GTB, there is a small plastic bellows that works off the carb. linkage. It cushions the return of the throttle to idle so it doesn't cut the engine off. Also it can eliminate backing off by slowing down the throttle rather than cutting it off quickly. It is located under the carb. linkage. It is about the size of a quarter and has a screw adjustment on it. It may have a leak in it or be out of adjustment. Your linkage stop should hit that bellows and gently slow the engine down to a idle. You can reach it with a long screwdriver from the front of the carbs. It is down low and you will probably need a flashlite to see it. Don't mistake it for the choke cam adjustment which is located above it and is more to the front of the carbs. A possibility. Magoo |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 147
Registered: 7-2001
| | Posted on Thursday, March 28, 2002 - 7:40 pm: | |
Stock points and ignition system. Could it be that the advance curves are so far out of whack that although I am sending the appropriate amount of fuel, it is misfiring so bad that it can't run? But (thinking out loud) why doesn't it die during high RPM as opposed to the slowdown? Thanks guys, Jerry. |
Richelson (Richelson)
Member
Username: Richelson
Post Number: 660
Registered: 12-2001
| | Posted on Thursday, March 28, 2002 - 3:55 pm: | |
Are you running stock R1/R2 points? |
Paul Newman (Newman)
Junior Member
Username: Newman
Post Number: 108
Registered: 12-2001
| | Posted on Thursday, March 28, 2002 - 3:48 pm: | |
It sounded to me like it stalled while coming to a stop according to the post. I would agree that fuel is the most likely reason. |
1975GT4Don (1975gt4don)
New member
Username: 1975gt4don
Post Number: 45
Registered: 1-2002
| | Posted on Thursday, March 28, 2002 - 3:03 pm: | |
since we are talking about a carbed 308 and the engine dying after hard accel, that could point to one thing: out of spec float levels. Starvation of fuel or spark is causing the dying. I would also take a peek at the advance curves of the distributors(2) and insure that the curves for both dist. are in synch with one another. |
Paul Newman (Newman)
Junior Member
Username: Newman
Post Number: 107
Registered: 12-2001
| | Posted on Thursday, March 28, 2002 - 2:47 pm: | |
Another thought which occurs on domestic cars is the dirverter valve for the air injection is malfunctioning and dumping air into the exhaust on decell. If your air injection is gone then forget what I just said. |
Bob Campen (Bob308gts)
Junior Member
Username: Bob308gts
Post Number: 87
Registered: 9-2001
| | Posted on Thursday, March 28, 2002 - 2:32 pm: | |
Do you still have the factory 2 point setup. This really sounds more of a combination of things, over fueling and ignition probelms. The engine dying bothers me more than anything else. |
Ken (Allyn)
Member
Username: Allyn
Post Number: 262
Registered: 10-2001
| | Posted on Thursday, March 28, 2002 - 2:18 pm: | |
This may or may not help, but when I leave my choke on in my carb Lotus after it's warmed up, it will backfire every time when I stop. I would check whatever choke system you have and look for it stuck open or something. |
Jerry W. (Tork1966)
Junior Member
Username: Tork1966
Post Number: 146
Registered: 7-2001
| | Posted on Thursday, March 28, 2002 - 8:05 am: | |
Lately when I take my 1979 308 for a spin and get on it for a minute or two, as soon as I push in the clutch to slow down at a light, the engine starts popping/backfiring and shuts off. It will immediately start back up and run just fine again until I give it juice again. All other times it seems to run very well. Would this be a timing problem? Thanks, Jerry. |