Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
08-05-2010, 01:29 PM | #1 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
No fire for 71 c-10 350 with new carb
Hello all,
My dad and I are trying to get our 71 c-10 back up and running. One year ago we got it running after about 10 yrs of sitting idle. Everything was going well until we noticed that there was gas leaking out of the side of the carburetor pretty badly. We tried rebuilding the carb ourselves and that didnt work out too well, so we ordered a rebuilt 4 barrel (same as what was on it). Dropped in the new carb, which was pretty easy. Went to start it, got one very loud backfire, the nothing. It is turning over well, but not starting up. Trouble shooting so far: We are getting gas to carb, choke is opening/closing. Changed points, condenser and coil. No spark from new coil, even when hook up directly to the battery. Checked to see if wires were hot using small screwdriver like device with a light bulb. Power to both post of coil as well as inside post. Power to points. Looked on the forum and noticed someone saying that it might be the distributor, but if we arent even getting fire from the coil when it is hooked up to the battery, could this really be it? Any ideas? Thanks |
08-05-2010, 01:44 PM | #2 |
Registered User
Join Date: Jul 2009
Location: Albuquerque, NM
Posts: 101
|
Re: No fire for 71 c-10 350 with new carb
not sure about going direct to the battery with the coil but i would leave it installed where it is supposed to go and start checking for spark at the plugs to the plug wires, have someone crank it while you hold the spark plug boot close to the end of the spark plug and you should see the spark jump from the wire to the plug (hold it just off the plug but as close as you can to the plug being still able to see it spark) then if no spark check the same at the dist. on the spark wire that goes to the coil. (disconnecting it at the dist. and having someone crank it while you check.
also check for 12v power at the coil and for ground. hope this helps get you pointed in the right direction, dave... |
08-05-2010, 01:48 PM | #3 | |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Quote:
We did that as well. No fire to the plug, no fire to the distributor from the coil. We charged the battery to full just in case it wasnt giving enough juice. I dont have a multimeter, but we checked to see if it was hot using the little screwdriver like device. when hooked up normally as well. |
|
08-05-2010, 01:53 PM | #4 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
|
Re: No fire for 71 c-10 350 with new carb
little screwdriver like device.
It is called a test light
__________________
Fuzzy |
08-05-2010, 02:30 PM | #5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
|
Re: No fire for 71 c-10 350 with new carb
did you set the gap for the points?
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
08-05-2010, 02:47 PM | #6 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
@hayhauler71: Well that makes sense, now doesnt it?
@cdowns: Yes, the points were set to .19 (I read that somewhere) |
08-06-2010, 06:29 PM | #7 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Any ideas why we wound not get any spark after changing out the carb., points, condenser and coil? Am I missing a grounding wire somewhere?
|
08-06-2010, 07:07 PM | #8 |
Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
|
Re: No fire for 71 c-10 350 with new carb
.19 dont sound right to me
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
08-06-2010, 10:44 PM | #9 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
|
Re: No fire for 71 c-10 350 with new carb
Put your test light on the neg side of coil and the other side to battery ground and have someone crank the engine. The test light should flash as the points open and close. If no flash the problem is in the distributor[ points, condenser]
__________________
Fuzzy |
10-09-2010, 03:25 PM | #10 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Hi everyone,
So today we replaced the distributor after setting the new points. Still nothing. To date we have replaced the condenser, distributor and carburetor. We can turn the engine over, and the carb is getting gas, but it never starts. I am completely stuck. Does anyone have any ideas? Thanks Colby |
10-09-2010, 03:38 PM | #11 |
Registered User
Join Date: Sep 2010
Location: Eugene, Or.
Posts: 322
|
Re: No fire for 71 c-10 350 with new carb
how much gas is the carb getting? I would take off the fuel line and put it in a plastic bottle, then turn the key to the right(just to get the fuel pump going) and see if it flows freely. you might need a new fuel pump. and is the carb BRAND NEW or did you get it secondhand?
__________________
........................ __ ............._______|__\____ ............|_({})______({})] ................(O)..........(O) |
10-09-2010, 03:51 PM | #12 | |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Quote:
Gas is coming out well from the fuel line. It was coming in pretty good spurts (aka not a constant flow). |
|
10-09-2010, 03:52 PM | #13 |
Senior Member
Join Date: May 2003
Location: ne florida
Posts: 2,665
|
Re: No fire for 71 c-10 350 with new carb
how bout the timming chain gears? have you brought number one up to see if it lines up with number one on the cap?
|
10-09-2010, 03:55 PM | #14 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
No, we havent done that. If we lined up the new distributor with the old one, would we need to worry about that? Wouldnt they be in the same position?
|
10-09-2010, 04:21 PM | #15 |
Registered User
Join Date: Sep 2010
Location: Eugene, Or.
Posts: 322
|
Re: No fire for 71 c-10 350 with new carb
should be a contant flow. i would get a new fuel pump, just a precationary measure and try it out, they are only like 25$( i have a fuel pump that goes along the fraim rail under the cab, i dont know how much one is that bolts on to the block
__________________
........................ __ ............._______|__\____ ............|_({})______({})] ................(O)..........(O) |
10-09-2010, 04:53 PM | #16 |
Registered User
Join Date: Dec 2003
Location: Yakima,WA.
Posts: 150
|
Re: No fire for 71 c-10 350 with new carb
It will never run without spark at plugs. You need to go thru the distributor and make sure everything is good ,set right and connected then retime motor and distributor by bringing number one cylinder to top dead center and installing distributor correctly.
__________________
Mark 67 c20 custom camper 55 Olds 2dr hardtop 96 mustang 11 dodge nitro |
10-09-2010, 05:29 PM | #17 |
Car Knocker
Join Date: May 2001
Location: jefferson,arkansas
Posts: 664
|
Re: No fire for 71 c-10 350 with new carb
I suspect a broken timing chain.Have you checked to see if the rotor is even turning? Take cap off and watch while someone is cranking engine. If good, then pull #1 plug, put finger over hole while someone bumps the starter. When air blows out plug hole, your at #1 top dead center. Look and see if #1 plug wire is in same position as rotor. If not pull dist and roll around till it is and reinstall. Hope it helps Buddy
__________________
68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit. |
10-09-2010, 11:53 PM | #18 | |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
|
Re: No fire for 71 c-10 350 with new carb
Quote:
READ: If you had a backfire you HAD spark. If you can squirt fuel out of the carb by rocking the throttle then you don't need a new fuel pump, don't throw money at something you don't need to, better to systematicly troubleshoot the problem. pulling the hose to see if fuel squirts into a containor is the best way to know it works. Check compression in a cyl with a compression guage. if you have compression you don't have a broken timing chain.. You do need to make sure the roter is aligned with the #1 position on the cap when the #1 cyl is at top dead center, see link below.... Per the previous post when you ( or your dad) bump the engine over with the #1 plug out and with a finger over the spark plug hole and start to feel the air being pumped out of the spark plug hole you need to hand turn the engine to line up the timing marks, its advisable to have someone else turn the engine by hand while you have your finger on that hole and make sure you feel the air being forced out as the timing mark is getting close, that is when your at TDC on the #1 cyl, then check the alignment of the roter and cap. Make sure also that you have the correct roter and that it will not spin on the shaft, i have gotten the wrong roter before and it would go on but could move side to side.. http://www.google.com/imgres?imgurl=...t:429,r:4,s:58
__________________
Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's Last edited by swamp rat; 10-10-2010 at 12:02 AM. |
|
10-10-2010, 12:22 AM | #19 |
Gone to greener pastures
Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
|
Re: No fire for 71 c-10 350 with new carb
For a rough check you can just bump the engine around until the timing mark on the harmonic balancer is somewhere in the neighborhood of 8-0 degrees BTDC on the pointer.
Use a Sharpie, or Marks-A-Lot and put a mark on the distributor body below the #1 tower on the cap. Lift the cap & the rotor should either be pointing at your mark on the distributor, or 180 degrees out (#6). If it is pointing to #6, you can roll the engine over 1 more revolution to get the rotor around to #1. If the rotor is pointing where it should be, that's close enough for it to start, if it's firing. I know this all sounds rather crude, but we're not building a Rolex, rather just trying to get a SBC to fire.
__________________
'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
10-13-2010, 11:18 AM | #20 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Sunday, we were able to get the truck started. We were able to do a rough, and I mean rough adjustment of the timing. We are going to get a timing gun soon to actually get it set correctly. We drove it around some and it had a bit of backfire through the carb (and a little out the tailpipe) but I _think_ that will be fixed by setting the timing.
Thanks for all of your help. I was getting really frustrated for a while there. |
10-13-2010, 11:46 AM | #21 | |
Registered User
Join Date: Jul 2010
Location: Las Vegas, Nevada
Posts: 43
|
Re: No fire for 71 c-10 350 with new carb
Quote:
Just my .02 Good luck Dan Last edited by danleaman; 10-13-2010 at 11:48 AM. |
|
10-13-2010, 12:21 PM | #22 | |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
|
Re: No fire for 71 c-10 350 with new carb
Quote:
Thanks! |
|
10-13-2010, 02:38 PM | #23 |
Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
|
Re: No fire for 71 c-10 350 with new carb
idle will change when you set the timing if the idle is 2 high to start with it will be near impossible to time as the weights int he dis will be thrown outward advancing the timing.
dont ask me how i know this lol
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-13-2010, 04:59 PM | #24 | |
Registered User
Join Date: Jul 2010
Location: Las Vegas, Nevada
Posts: 43
|
Re: No fire for 71 c-10 350 with new carb
Quote:
Dan |
|
Bookmarks |
|
|