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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: TxFiddler on September 28, 2010, 01:22:44 pm
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Gave ol' "PawPaw" an oil change Sunday evening. Got in Monday morning to head to work and no go. Getting plenty of gas to carb but the spark seems to be intermittent. Will actually backfire when trying to crank. Had to work till 9 last night and wasn't even gonna attempt a night fix. After work today, I plan on checking the ignition module, coil, cap and rotor. The cap and rotor and wires were replace about 3mos ago. Oh yeah, 1980 C10 with 350. It is more than likely one of these things, right?
Thanks,
Fiddler
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Do you have ESC distributor?
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I forgot to mention that it's a stock HEI setup.
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I mean do you have the 4 pin module or one with more? Just one power wire into the distributor?
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Has it rained or anything ?
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Just one power wire and no, it hasnt been raining. Just replaced cap, rotor, module, and coil. Still nothing. I know that you can buy new "bad" parts. So now I'm gonna backtrack.
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Have you check for power at the hot wire
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Irish, i dont have any way to test it.....diagnostic tool poor.
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I did test with a light that a tech friend of mine let me borrow. You plug one end into the dist cap and the other to the plug wire. It has a light that lights up. And it did light up but I only did the #1 wire. Is it normal for gas to kinda squirt up outta the carb?
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When you move the throttle yes fuel should squirt out. The test light you used did its job. Is the fuel just flowing or is it only when you move the throttle
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not moving the trottle at all. the fuel is squirting on its own....mechanical fuel pump, not electric. still acting like it wont fire though.
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Also Irish, it's an Edelbrock 1406...thanks.
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battery is good?
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Got the battery on charge as we speak. What's up with the gas squirting out of the carb? is it normal? It's just really noticeable with the breather off.
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If its like poring into the carb then something is stuck maybe float or something this is causing the engine to flood cut the fuel off ASAP. After rebuilding the carb you may have to change the oil check on it see if it’s thin or smells like fuel
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You can try tapping on the top of the carb. near the fuel bowl and see if it will unstick (assuming its the float sticking). The problem will still have to be addressed and soon. Definitely change your oil. Smell it like Irish said--it probably smells like gas and will destroy your engine.
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It has to be the carb. Getting spark but seems to be flooding out. Fooled with it a little this morning but gotta go to work now. Off on Thursday so hopefully i can fix it then. I'm thinking of taking the carb off and removing the top and checking things out. Will post updates. Thanks for all the suggestions.
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No need in removing the top half just a Carb problem change the fuel filter also while you're at it
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Irish, not clear on what you mean. "no need in removing the top half"? I need to remove the air bowl to check the floats for adjustment and to see if they "float", don't I? If there's another way, please advise. I have one of those clear in-line fuel filters up by the carb. Took it off and cleaned it last night. Was kinda dirty. That's why i suppose something may be causing something to get stuck open in the carb like a needle and seat. Thanks.
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you could try tapping the carb on the side a little bit to see if the needle starts to seat. You don't have to take the carb off the engine to pull the top, just makes it easier.
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Ok thought when you said you were removing the Carb the taken off the top you were talking about removing the intake
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Thanks again Irish. Not gonna remove the intake, just the carb. Will post updates tomorrow.
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So, today I checked the floats and readjusted to edelbrock specs, replaced needles and seats, cleaned all parts really good with cleaner and STILL won't start! Could my truck have jumped time some how? I don't have a timing light or a vacuum guage. It is firing and it is getting fuel. Silly question, but is there a fuse somewhere that could be blown? I consider myself mechanically inclined but I don't have a whole bunch of diagnostic experience. Any suggestions are once again, greatly appreciated.
Fiddler
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Its possible for your timing chain to slip did you fix the fuel problem. Also try taking out the plugs maybe fuel is still sitting in the cylinder
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Ran out of daylight. It's so close to starting. I will check the plugs for fuel in the cylinders and go from there. Thanks again to all.
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I am kinda sad and excited at the same time! I took another look at what was going on Sunday morn with a buddy of mine. Even got another distributor and tried it out. Well, comes to find out that either my camshaft is busted, timing gear busted, or something is just plain wrong on the inside. Removed the passenger side valve cover to see what happens when we turn it over. Not much movement at all. Also, I took this pic. Would bent rods cause this? Gonna start tearing out down on Wednesday and see what's up. Ol' pawpaw might get a heart transplant sooner than planned!
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I'm dying to see what caused that too. Yeah I guess a bent pushrod could do that, but two or more seems unlikely. Broke timing chain/slipped timing and valves hit the piston crossed my mind, but I dunno.
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Jared, I kinda thought the same thing. I will definitely post updates and pics as this mystery unravels.
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bent pushrod, dropped lobe, broken or weak spring , bad lifter all will cause the rocker to fall of.
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Man, and I just got rid of my engine stand otherwise, you coulda had it.
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Thanks Red,
Always a day lot and a dollar short! No problems though. Looking forward to gettin into it. I just can"t decide what I want to do in place of this old stock 350.
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400... When I got my new cam installed, I have 4 bent pushrods, and one bad lifter. Cam was worn, but fine. Mind you, these where new pushrods and lifters when I put my motor in and had about 300 miles on them. My mechanic told me he couldn't believe how well it ran like that!
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Since I'm gonna be ditching this old 2 piece rear main, I want to get something possibly turn key or at least to where I can add intake and my carb. What have some of you guys done? I've got a fairly good budget I can play with. Also, now would probably be the best time to do the 700R4 swap, I guess. Right? So many decisions.......
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Update! Update! Update! I just picked up a 396 big block out of a 67 Chevelle SS. I can't wait to do the big Block Swap! It has a set of Hedman's with it as well as a 350 tranny. Since this is going into a 2wd 1/2 ton, do I need to beef up the front suspension at all? I will be needing any helpful tips from those who have done this sort of thing. i am excited!
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Nah, just get it aligned and re-aim your headlights. You'll like the stance. Hardest part to the swap is the power steering bracket.
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Here's whats gonna be going in. 396 BB Chevy. Gonna either do a serp system or cog pulley system. Will post up as progress goes. Prolly gonna start a new thread.