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Banned
Join Date: Nov 2022
Posts: 2
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Shooting docks
Reinstalled my cuz 2.7 CIS after a bit of freshening up and it seems to be running on the left bank only. It backfires continuously at lower rpm but the new pop off valve seems to work quite nicely.
The spark plugs were wet on the right hand bank with some soot as if they were firing at times. The left hand plugs look normal. I rechecked cam timing and found the left hand cam was out of limits by .001 (.015). The right hand cam was at .020. Reset the LH cam to .020. I did not have shielded ignition wires, could this cause the problem? The distributer cap was not the Bosh but the other one our benefactor sells. It never seemed to fit right but it ran the same when I put the old cap back on. Changed from points to Petronix and back to points and back to petronex no change. If the CIS pistons are installed wrong on the right side could this cause it not to fire on that side? This is about the only thing that I can not easily check. I do not want to reinstall if I can't find some reason why it will not run on both banks. Any theory? |
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11-14-2022, 04:47 PM
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Registered
Join Date: Dec 2003
Location: Australia
Posts: 344
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Does it have spark on the non firing bank? If you have put the pistons upside down on that bank the valves may have hit the pistons and bent them? Do you have compression on those cylinders on that bank that isn’t firing? Unlikely that it is the plug wires unless they have very high resistance or have a break in the core so probably not that. Probably need to get some more basic info to try and diagnose the issue.
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11-14-2022, 09:51 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,468
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Pull the distributor and rotate 180 degrees and see if the other bank lights off.
If it does, you have a cam out180 degrees. Bruce |
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11-15-2022, 05:05 AM
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Registered
Join Date: Feb 2007
Location: Northeast
Posts: 463
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I second Bruces idea-but wonder what "shooting docks" is?
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Mark www.exotechpower.com 1981 Targa-messed with. 91 C2 supercharged track rat Radical Prosport-irritates the GT3 guys 40 years of rebuilding services |
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11-15-2022, 05:27 AM
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shooting docks is the practice of fishing from docks to catch crappies or whatever fish are present. had to look it up because my brain won't leave me alone. your welcome.
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12-01-2022, 04:44 PM
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I am with a cam 180 deg out. If one bank of headers is cold and the other super hot, that would be my first guess. BTDT. And yes - you can re time them in the car. Not ideal but..............
I am presuming you have not touched the CIS. I had a similar issue once when it had previously been running fine. Then next time started up after sitting a while, dropped one side. Turned out to be in the fuel head - the sealing O rings over the slits had given up on one side of the FD. Weird - but new O rings fixed the issue. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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12-01-2022, 06:10 PM
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