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Post by DocSpeed on Oct 22, 2005 18:37:30 GMT -5
Took the C10 out for a spin the other day with the new carb and decided to test her out.
At part throttle she drives fine no problems, but at WOT, it makes a constant backfiring that sounds to be coming from the intake. While it is doing this, it seems that the engine loses power. But like I mentioned before, it runs really good and has plenty of power as long as I don't have my foot all the way down on the gas.
What could be the problem? BTW, it had this same problem before I changed the carb.
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Post by 1bad2k2ta on Oct 22, 2005 18:47:47 GMT -5
Took the C10 out for a spin the other day with the new carb and decided to test her out. At part throttle she drives fine no problems, but at WOT, it makes a constant backfiring that sounds to be coming from the intake. While it is doing this, it seems that the engine loses power. But like I mentioned before, it runs really good and has plenty of power as long as I don't have my foot all the way down on the gas. What could be the problem? BTW, it had this same problem before I changed the carb. Most likely, the timing is too far advanced, but could also be lean. Check timing first, if that doesn't do it, you will need to fatten up the secondary jets. |
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Post by DocSpeed on Oct 22, 2005 20:35:13 GMT -5
I have checked the timing but I thought I wasn't advanced enough. My mistake. I really doubt it is running lean with the double pumper. I will retard the timing and use a timing gun this time and let you know how things go.
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Post by 1bad2k2ta on Oct 22, 2005 21:01:48 GMT -5
I have checked the timing but I thought I wasn't advanced enough. My mistake. I really doubt it is running lean with the double pumper. I will retard the timing and use a timing gun this time and let you know how things go. If it turns out the timing is good, check your fuel filter and pump to make sure they are up to the task. |
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Post by AAron on Oct 22, 2005 22:30:20 GMT -5
does it have a problem starting when hot?
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Post by DocSpeed on Oct 23, 2005 14:03:32 GMT -5
does it have a problem starting when hot? It did so I backed off the timing to begin with. This is why I thought I needed to advance the timing more because I thought I backed off too much. I just checked the timing again and got the engine idling real good, starts easy too. I replaced the fuel filter and checked the fuel pump. I have got a clear fuel filter and the glass stays full of gas. Tried the engine again and the popping is still there.  My father-in-law said he experienced a similar problem with an older car he owned, it ended up being a worn lobe on the camshaft. I am not sure how many miles are on my 350 but I think it may have a good many. Any other suggestions? |
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Post by 1bad2k2ta on Oct 23, 2005 14:14:41 GMT -5
does it have a problem starting when hot? It did so I backed off the timing to begin with. This is why I thought I needed to advance the timing more because I thought I backed off too much. I just checked the timing again and got the engine idling real good, starts easy too. I replaced the fuel filter and checked the fuel pump. I have got a clear fuel filter and the glass stays full of gas. Tried the engine again and the popping is still there. My father-in-law said he experienced a similar problem with an older car he owned, it ended up being a worn lobe on the camshaft. I am not sure how many miles are on my 350 but I think it may have a good many. Any other suggestions? Might be in the distributor. If it is old, it could have enough slop in it to cause high rpm problems. What kind of distributor do you have? |
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Post by DocSpeed on Oct 23, 2005 14:17:15 GMT -5
OEM HEI
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Post by 1bad2k2ta on Oct 23, 2005 14:29:18 GMT -5
Do you know where you can get your hands on a known good one for testing? |
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Post by DocSpeed on Oct 23, 2005 14:33:22 GMT -5
Probably could find one at my father-in-laws garage... I will check this out as soon as I can get my hands on one.
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Post by AAron on Oct 23, 2005 17:05:55 GMT -5
have you checked the spark? id do that before i would go and change distributers. then check wires. etc
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Post by AGRV8D on Jan 25, 2006 11:03:11 GMT -5
i just picked up a 69 c10 and i was having the same problem...my culprit was it Jumped time....the timing chain was loose as hell, and i go to put back at TDC and broke two bolts off inside the Cam....
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Post by DocSpeed on Jan 25, 2006 17:55:51 GMT -5
Ended up being several worn out camshaft lobes. New cam fixed everything. I ended up selling it though so I could acquire the Grape.
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Post by AAron on Jan 26, 2006 0:55:48 GMT -5
i still love those old C10s
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