![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 471
|
Arrrrggg! carb blowing gas 4ft high! timing?
Trying to test-fire my new 350 for the first time. Carb is blowing gas out the top, which I assume means that my timing is badly off. I've tried 3 times to set the timing. Here's how I did it...
I remove plug #1, had the wife turn the engine over (with the starter - not by hand) while I felt the air passing in/out of the plug hole. I had her stop the engine prior to the larger of the two pursts of air, and then I turned the engine forward by hand until I reached TDC, which I measured via a curved piece of ire through the hole. I then lined up my HEI dist pointing to the #1 plug wire, checked my firing order again. I'm sure the firing order is correct. Am I 180* out? If so, can I just turn the dist 180*? |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
|
Well, if you are backfiring through the carb, you are most likely on #6 instead of #1. To be sure, you'd have to pry your timing cover out enough to see where the timing chain dots lined up. There was a thread started within the last week that had great detail.
|
![]() |
![]() |
![]() |
#3 |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 471
|
well I found that if I give it a good advance, I get a backfire through the exaust. If I retard it a bit, the gas out the carb gets a bit higher. So I must be well-off the mark.
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Sep 2002
Location: long island, new york
Posts: 1,333
|
no is the gas streaming out of the bowl vents? the tubes on either side of the barrels? if so ur timing has nothing to do with it. if so ur floats are either set too high or there stuck. this happend to me in the past sure does make a mess! -kyle
__________________
1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door |
![]() |
![]() |
![]() |
#5 |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 471
|
if I disconnect the +wire from the HEI I don't get any fuel spray - it's only when the ignition is charged.
|
![]() |
![]() |
![]() |
#6 |
Registered User
![]() Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
|
Must be timing is off. Why did you not look at the timing mark on the tab when you did tdc? Instead of a wire. Just put it on zero with Number 1 on compression stroke.
__________________
1968 Chevy 4x4 307 4 speed |
![]() |
![]() |
![]() |
#7 | |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
|
Quote:
|
|
![]() |
![]() |
![]() |
#8 |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 471
|
No timing mark tab :-( I've got the water pump off now and am pulling the timing cover. Then I'll know for sure it's timed correctly. wish I'd done this before I put the core, radiator, grill, and antifreeze in!
|
![]() |
![]() |
![]() |
#9 |
Registered User
![]() Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
|
Bummer, good luck man. When you dropped the distrb. in place did you back up the rotor button about 15 degrees prior to setting down? This would need to be done or your timing will not be correct. It rotates in to place as the gears mesh. If taking the timing cover off it would be a great time to put the timing tab on the cover. Takes a lot of the guess work out of the equation.
__________________
1968 Chevy 4x4 307 4 speed Last edited by GMC AMI; 01-02-2005 at 04:57 PM. |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
|
No timing tab, how are you going to check timing with it running....
Hope you set the plug wires in the right spots, different on the points or hei dist.
__________________
1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
![]() |
![]() |
![]() |
#11 | |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 471
|
Quote:
|
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
|
HEI dist has the #1 plug wire in a different location than a points type.
__________________
1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
|
Techinically, you can place the #1 plug wire whereever you want to on the distributor. You just have to properly align the rotor to hit it advanced of tdc. The location of #1 isn't different between HEI and points.
|
![]() |
![]() |
![]() |
#14 |
Registered User
Join Date: Dec 2002
Location: Marysville, WA
Posts: 101
|
sounds like you could be off by 180 if its firing out the carb the engine is firing when the valves are open.
__________________
1971 gmc 3/4 ton, 350, t350 |
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Nov 2004
Location: Claysburg, Pa
Posts: 408
|
You dont happen to have your rocker extremly over tightened do you ?? Just a thought because that would do it.
|
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
|
If you think it's 180* out, just swap each plug wire with the one directly opposite it on the cap. No need to pull the distributor.
|
![]() |
![]() |
![]() |
#17 | |
Registered User
![]() Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
|
![]() Quote:
__________________
1968 Chevy 4x4 307 4 speed |
|
![]() |
![]() |
![]() |
Bookmarks |
|
|