Vacuum Advance/ Timing Question
11-19-2012, 05:36 AM
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Vacuum Advance/ Timing Question
Recently just rebuilt my 22r for my 82 4x4, seemed to run great but when I broke out the timing light I stated having issues. With both vacuum advance hose's unplugged and blocked off the timing light is showing right at 8 dbtc, but as soon as I plug them back in it jumps to 22 dbtc. As far as I know and what my fsm says, with the vacuum advance hose plugged in I should be at 15 btdc. Any thoughts to as why it would do this? I know that all of my vacuum hoses are correct, just spent some time tracing them all. Its there a switch or sensor that could be bad?
11-19-2012, 05:54 AM
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Sounds like you need to retard the timing by about 10 degrees. Doesn't it make sense that the vacuum advance would advance the timing when you connect it? I don't have the numbers in front of me, but I think 5-7 degrees btdc is normal w/o advance line connected (but vacuum line plugged).
FYI- my '83 22R likes to run more advanced than FSM specs by a few degrees. As I recall, I left it at about 8 degrees BDC with vacuum line disconnected (and plugged). Am I right...????
FYI- my '83 22R likes to run more advanced than FSM specs by a few degrees. As I recall, I left it at about 8 degrees BDC with vacuum line disconnected (and plugged). Am I right...????
Last edited by 83pingpong; 11-19-2012 at 06:41 AM.
11-19-2012, 05:57 AM
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Are you checking it when the engine is warmed up fully? Is your idle set too high, maybe? It's been a while since I had a stock dizzy, but I thought you set idle/unpluged vac advance to 5°. With the vac lines hooked up and engine warm, idle at 750-800 rpm, you should be at around 12°. But that's where mine is happy. Dial it back, drive and see how it works, pull a good hill and see if it knocks and pings, find where it's happy. Keep and eye on your plugs. Too advanced will run hot, give you problems.
11-20-2012, 07:50 PM
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The older first gen 4x4's are 8 degrees and advanced th 15. Its the newer ones at 5 and 12 (85 and up i think) but yes the engines warn and idle is spot on. Im using a nice snap on timing light that gives me the rpm's dead on. Could the vacuum advance on the remaned uint be bad or calibrated wrong?
11-24-2012, 05:47 PM
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This should help for the vacume advance!
http://www.lceperformance.com/Distri...-p/1081123.htm
This is what I got , very easy and cheap to replace.
http://www.lceperformance.com/Distri...-p/1081123.htm
This is what I got , very easy and cheap to replace.
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