| Author |
Message |
JRV (Jrvall)
Intermediate Member
Username: Jrvall
Post Number: 1948
Registered: 11-2002
| | Posted on Wednesday, July 16, 2003 - 4:53 pm: | |
>>Could some of you be trying to give it too much fuel? When you do a hot start, do you see black smoke?<<
Sounds possible from following along.
Assuming the engine is tuned (carbs set right, distribs & points in good condition, descent plugs) , a simple 1/4-1/3 throttle, no pumping hot, and the engine should fire right up.
This applies to all carbed Ferraris. |
Hans E. Hansen (4re_gt4)
Intermediate Member
Username: 4re_gt4
Post Number: 1565
Registered: 4-2002
| | Posted on Wednesday, July 16, 2003 - 3:15 pm: | |
This just occurred to me. Sometimes I go braindead and forget that I'm starting a hot motor, and pump the pedal. It starts with greater difficulty, and puts out a big puff of black smoke.
Could some of you be trying to give it too much fuel? When you do a hot start, do you see black smoke? |
Hans E. Hansen (4re_gt4)
Intermediate Member
Username: 4re_gt4
Post Number: 1562
Registered: 4-2002
| | Posted on Tuesday, July 15, 2003 - 11:41 pm: | |
Yes, I DO leave my engine cover open when I go into the store, bank, bar, tavern, strip joint, or whatever. Never have had any problems.
I have never had a hot start issue. I just crack the throttle slightly, and crank. When it feels like it's 'catching', I open the throttle slightly more. Starts immediately every time. Like within a second or two. Even in 100 deg temps. |
Philip Airey (Pma1010)
Member
Username: Pma1010
Post Number: 313
Registered: 7-2002
| | Posted on Tuesday, July 15, 2003 - 10:30 pm: | |
Mike
My 77 GTB runs a bit slow (low idle) when starting and v hot. Returns to normal after 10 seconds or so (but I do have a HPX set up). As I recall, Ferrari recommends depressing the loud pedal slightly when the motor is warm. |
"The Don" (The_don)
Senior Member
Username: The_don
Post Number: 5976
Registered: 8-2002
| | Posted on Tuesday, July 15, 2003 - 8:31 pm: | |
Jonathan,
the only thing you should choke is your chicken. not the f-car |
Jonathan (Birdman)
Junior Member
Username: Birdman
Post Number: 85
Registered: 6-2003
| | Posted on Tuesday, July 15, 2003 - 8:30 pm: | |
Mike,
Man, you have it down to a science! I'm glad that I'm on the right track with this and my car acts like others. Boy, fuel injection was a cool invention huh? These days, nobody cares about the correct procedure to start a car with carbs! The other day a friend of mine was in the car and his eyes popped out of his head when he looked down and exclaimed: "You have a manual choke in this thing?"
Jonathan |
"The Don" (The_don)
Senior Member
Username: The_don
Post Number: 5975
Registered: 8-2002
| | Posted on Tuesday, July 15, 2003 - 8:20 pm: | |
Mike,
my car suck in any temp above 95 degrees.
Matt |
Mike Procopio (Pupz308)
Member
Username: Pupz308
Post Number: 447
Registered: 10-2002
| | Posted on Tuesday, July 15, 2003 - 8:11 pm: | |
Jonathan, your hot start procedure is exactly my own.
When hot, my thinking is: don't even TOUCH that gas pedal until you've been cranking the starter for three or four seconds. Gradually tap it, and it will gradually come to life.
The hotter the engine is, the less "pre-pumps" you do before cranking. (All this is after the 15 seconds, or more like 10 in reality, that it takes to charge the fuel system.)
When cold, it's 2.5 pumps; after 4 hours, 1 pump; and so on linearly down to anything less than 1 hour means to pumps before starting.
Just my empirical results on how to get the thing going.
Guys, after a hot start, do you find the car runs worse or not? My car runs like hell after a hot start till things normalize... We've theorized about the coils overheating, about vapor lock, etc. Haven't yet changed out the coils.
--Mike
|
dave handa (Davehanda)
Intermediate Member
Username: Davehanda
Post Number: 1255
Registered: 5-2001
| | Posted on Tuesday, July 15, 2003 - 6:43 pm: | |
Joe,
The quick and inexpensive test of your theory would be to stick some NGK BPR5ES or BP5ES plugs in there and see what happens. The stock jetting on a 78 308 is pretty lean compared to the earlier years (125 mains versus 130 or 135 forget which) but your idle mixture could be off...
|
"The Don" (The_don)
Senior Member
Username: The_don
Post Number: 5967
Registered: 8-2002
| | Posted on Tuesday, July 15, 2003 - 6:16 pm: | |
You guys let your fuel pumps run for 20 seconds BEFORE starting up right? |
Jonathan (Birdman)
Junior Member
Username: Birdman
Post Number: 81
Registered: 6-2003
| | Posted on Tuesday, July 15, 2003 - 6:06 pm: | |
Sheesh guys...seems kind of impractical leaving the engine lid open while you're in the bank or the grocery store or something!!
Mine (77 GTB) definitely starts better cold than it does hot, but I have found through trial and error the best starup procedure that works. (For me, cranking a few seconds with no gas, then a gentle tap on the gas and it springs to life). Of course, the procedure always fails at important times, like when other people are watching at the gas station.
Jonathan
|
"The Don" (The_don)
Senior Member
Username: The_don
Post Number: 5966
Registered: 8-2002
| | Posted on Tuesday, July 15, 2003 - 5:41 pm: | |
Hans,
You are not off base. That is how I fixed the hot start. |
Hans E. Hansen (4re_gt4)
Intermediate Member
Username: 4re_gt4
Post Number: 1557
Registered: 4-2002
| | Posted on Tuesday, July 15, 2003 - 5:34 pm: | |
Call me "Hans the Paranoid", but this is part of the reason that I always open the engine lid when shutting the car off hot. I'm afraid heat soak with next-to-no air circulation will destroy hoses, seals, gaskets, wires, mice, Klingons, etc., as well as potentially boiling any gas in the carbs or fuel lines. So try opening that deck lid and see if there is an improvement. |
"The Don" (The_don)
Senior Member
Username: The_don
Post Number: 5963
Registered: 8-2002
| | Posted on Tuesday, July 15, 2003 - 5:13 pm: | |
Sounds like Carb Vapor Lock. I get that from time to time. |
Joe Ruotolo (Gtb24733)
New member
Username: Gtb24733
Post Number: 1
Registered: 7-2003
| | Posted on Tuesday, July 15, 2003 - 4:49 pm: | |
My 1978 (North American) 308 GTB runs beautifully, but will not start easily (without a lot of cranking and some serious gas-pedal pumping) after it has been warmed up and then shut off.
I believe it may be burning slightly rich (as there is abundant black soot around the tips of my exhaust), and I thought that maybe (just maybe) this rich"ness" might have partially fouled the plugs, making the car a bit more difficult to start when warm.
What else would cause my hot-start issue? If it starts readily when cold, that tells me that my carburretor float levels and injector pump mechanisms are ok. Is vapor-lock a possibility? Any thoughts? Thank you and best regards- |