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#1 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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HELP! rebuild timing problem
I have a 350 I just put together, all stock w/roller lifters electronic ignition. the thing will not stay running under 1500 rpm and about 15-20 degrees advance If I retard spark it pops out the carb. I rechecked valve adjustment and it was ok,rechecked plug wires ok I'm thinking the timing chain might have jumped a tooth
also the carb a rebuilt carter 4 barrel has fuel coming out of only one side,I took the top off and checked for something clogged but every thing is clear My question is is the carb problem related to a timing problem or am I missing somthing else before I tear timing cover off to check it? sorry to be so long but this is driving me crazy any help would be great, thanks Kman ![]()
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#2 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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anyone?
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#3 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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fuel on 1 side????with the engine "OFF" pump the carb a couple of times with your hand ,look into the carb while doing this.this is a way to check your accelerator pump in the carb,,,,you should see gas squirting on both sides,,,,,,,try that first,,,,,,,,id concentrate on the carb as being the problem....jeff
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#4 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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if your timing chain jumped iwould think it would run rough at ANY rpm..
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#5 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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accelerator pump is fine the left side of primaries has no fuel at low rpm at about 2500 there is some fuel maybe vac prob?
runs pretty smooth at 2000 but stalls below 1500 and pops through carb
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#6 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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it sounds like firing order is wrong but I ran the wires twice they are right
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#7 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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is there a way to tell if the timing chain is off with out pulling the cover??
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#8 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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ttt
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#9 |
Registered User
Join Date: Jun 2003
Location: Ponder, TX
Posts: 33
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Are you running a single or dual plane intake manifold? If it is dual plane, with no fuel coming through one of the primaries, 1/2 of the cylinders won't be getting gas. I believe the carb should be spitting out fuel in both primaries when you pull on the accelerator cable with the engine off, but I'm not real familiar with Carter carbs. Even a single plane intake would probably run rough, as I doubt only one primary could feed enough fuel to run all 8 cylinders. Also look for a vacuum leak, it would have to be a big one. As for checking the timing, you pretty much have to pull the cover, but I would rule everything else out first, as it is almost impossible to get it sealed back up, and not leak. Good Luck
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#10 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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are you sure your distributor isnt off a tooth its almost impossible for a brand new chain to jump a tooth unless you installed it wrong. to me it sounds like your a tooth off
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#11 |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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VACUUM leak
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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#12 |
huh?
![]() Join Date: May 2000
Location: Washington, Illinois
Posts: 5,692
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I agree with bigjim. The 79 F100 out back is the same EXACT way....because I tried to reuse the base to manifold gasket (yes, I'm that cheap, it's a woods truck). Use an unlit propane torch around the intake, and see if the RPM's increase. If they do....you've found your leak.
Good luck, keep us posted.
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#13 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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OOPS/EDITED
starting fluid will give the same result,the rpm will rise if theres a leak..........
Last edited by jef5150; 07-20-2003 at 12:13 PM. |
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#14 |
go cyclones
Join Date: Jun 2003
Location: Ames, IA
Posts: 1,885
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How do you use the propane torch, I have heard that one yet. But I guess I haven't that much yet. Yesterday I saw the saying since "Christ was a Corporal" and thought that was new. I found out otherwise.
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#15 |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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start the engine...turn the gas on, on the propane torch. do not light the tourch...point the nozzle of the flowing torch at the base of the carb..all the way around the bottom...if the engine smooths out..that is where the leak is
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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#16 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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Thanks for the input guys.
Wouldn't you be able to adjust dist to compensate for one tooth out? The fuel problem is the amount of fuel flowing through the two venturi of the primarys one side has no fuel at idle and only a little at higher rpm. The accelorator pump is fine, two streams of fuel The timing chain being off a tooth would of happened when I assembled the engine lol. I am going to work on it tommorow and will check out your suggestions.... I'll keep you posted..... Kman
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#17 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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total rebuild?.......did you put a new timimg chain & gears on?.....did you line up the 2 dots on the timing gears when you put on the new chain on???
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#18 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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one last thing,,,,,,,,you didnt put the old timing chain and gears on your NEW REBUILD did you??/,,,just asking
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#19 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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I double checked the marks on gears but something could have moved and yes I used the old chain and gear..I know I know it should of been changed but it was a very low dollar (make it work ) job for a friend
thanks kman
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#20 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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old gears????????????????????????????????
thats probably your problem,,,,,new gears and chain are like what,, $40.00????????
Last edited by jef5150; 07-20-2003 at 08:56 PM. |
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#21 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
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you could try moving the spark plug wires clockwise 1 position,,,,,see if it helps,,,,then try the other direction,,,,,,,i think even if you pull and move the distributor 1 gear that would be too much,,,,,,butt you can try .....jeff
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#22 |
Registered User
Join Date: Sep 2002
Location: Melbourne,Florida
Posts: 174
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I have a list of things to try first
Thanks for the help kman
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New 89 chevy 1500 driver 72K20 rust bucket project stripped down to the frame engine rebuild started 71 Blazer - another procect |
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#23 |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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a faulty timing chain..or..mis aligned timing set will effect valve timing. its almost impossable for a timing set to skip a tooth..not enuff room. If the set is worn out,really worn out, you would of noticed when you installed it. Check all of the easy things first. Good luck
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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