Spooled_Starion Posted October 18, 2011 Report Share Posted October 18, 2011 What is the vacuum at idle suppose to be on a healthy engine? I run Right at -7 and when the engine is fully warmed up I idle around 500-600 rpm. When I adjusted timing I rechecked it and it is right in the middle at tdc instead of 10 BTDC, is that bad? Link to comment Share on other sites More sharing options...
Starwolf Posted October 18, 2011 Report Share Posted October 18, 2011 Need sto be at 10 BTDC im assuming you are checking vacuum on the stock boost/vac gauge? If so you need to know now that that gauge is super inaccurate and should probably get an aftermarket if you plan on upping the boost at all. Link to comment Share on other sites More sharing options...
Spooled_Starion Posted October 18, 2011 Author Report Share Posted October 18, 2011 Need sto be at 10 BTDC im assuming you are checking vacuum on the stock boost/vac gauge? If so you need to know now that that gauge is super inaccurate and should probably get an aftermarket if you plan on upping the boost at all. So basically I pull the vacuume line off of the vaccume advance and plug the vacuume line, turn the knob on the timing light to zero, adjust distributer until it lines up on 10 BTDC, then tighten down distributer, then reattach vacuume line and it's good? But yes I plan on getting an aftermarket autometer vacuume/boost gauge in the factory location sometime in the near future. Link to comment Share on other sites More sharing options...
suchconquest Posted October 18, 2011 Report Share Posted October 18, 2011 (edited) you do not need to pull the vacuum line off when adjusting the timing on these cars. Edited October 18, 2011 by suchconquest Link to comment Share on other sites More sharing options...
Indiana Posted October 18, 2011 Report Share Posted October 18, 2011 Setting timing and TPS assumes the car has no issues that otherwise would cause problems but its a starting point. Link to comment Share on other sites More sharing options...
Metric-man Posted October 19, 2011 Report Share Posted October 19, 2011 So basically I pull the vacuume line off of the vaccume advance and plug the vacuume line, turn the knob on the timing light to zero, adjust distributer until it lines up on 10 BTDC, then tighten down distributer, then reattach vacuume line and it's good? But yes I plan on getting an aftermarket autometer vacuume/boost gauge in the factory location sometime in the near future.Engine coolant should be at 95F or greater to avoid 5 degrees advance from cold start timing control.High altitude compensation plug doesn't need to be disconnected and grounded,because in Medford Oregon the higest elevation is only 1,382 ft (421 m)Vacuum advance could be tested with negative pressure w/ a hand pump,to make sure it is working after setting the distributor timing.ISC/TPS should be checked after (re)-setting curb idle speed, since the ISC maintains idle speed. 1 Link to comment Share on other sites More sharing options...
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