engine runs on 2 cylinders, nothing on cylinder 2 and 4 |
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engine runs on 2 cylinders, nothing on cylinder 2 and 4 |
JOE M |
Aug 27 2008, 08:46 AM
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#1
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Member Group: Members Posts: 293 Joined: 27-August 07 From: N.H Member No.: 8,042 Region Association: None |
I know I am going to get beat up hard for this one but here goes. I have been trying to tune my carbs for a while now but have had no luck. I got the car to idle great ( I followed Rich`s advice by taking the linkage off and tuning each side individually. I got all 4 cylinders reading the same with the snail. I reved the engine a little and it started to pop through the cylinder #2. I let it idle for a while and pulled cylinder #2 wire and the engine continued to run the same. I pulled the wire for cylinder #4 and it still ran the same. I than pulled #1 and it almost stalled and the same was true for #3. I was puzzled that it would run so good on 2 cylinders. I turned the engine off and started it with cylinder #2 and # 4 off. It started up and idled fine. I verified the plugs were good by swapping them in the cylinders that were good and I swaped the wires as well. If my timing was way off could this cause this or is more an issue with the cap and rotor? I am so close but this is killing me because I cant tune it if it is not running on all 4 cylinders. Any ideas what is going on?
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SGB |
Aug 28 2008, 07:11 AM
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#2
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
yes a compression test would be the easiest way to check that. My dizzy is 90 degrees out like that too. Drive gear put in wrong. Looks just like your orientation, and works fine.
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JOE M |
Aug 28 2008, 07:36 AM
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#3
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Member Group: Members Posts: 293 Joined: 27-August 07 From: N.H Member No.: 8,042 Region Association: None |
yes a compression test would be the easiest way to check that. My dizzy is 90 degrees out like that too. Drive gear put in wrong. Looks just like your orientation, and works fine. I know that I do not have great compression. However the 2 cylinders that are not working are at around 90psi. I have 1 cylinder that is at about 75~ 80 and I believe that is #1. #1 seems to run fine. I think the books say I should be around 120 or so but I cant remember. The other problem is that my valves are not adjusted yet so I am wondering how much of my compression loss could be a result of valve adjsutment? I am no mechanic but it seems that if the valves were not closing corectly than I would have low compression ( just a guess). If I place my hand over each barell I can feel a ton of suction. I am guessing again but if I had too low compression I probably would not be able to feel suction. I have never done a leak down test but I guess I will have to get my compression meter out and re-verify. Hope this does not mean I need some valve work because it looks like a big job. |
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