scooterh72 Posted October 23, 2010 Report Share Posted October 23, 2010 Found a pretty good vacuum leak that I fixed and the car doesnt cough and sputter any more but I have noticed one thing. When Im driving say at 30mph it feels like the car is surging forward. Not very smooth at all. I also noticed that when I was setting timing,the timing mark actually moves, jumping backwards (retards I think) a little while idling. Could this be caused by a worn out distributor? Vacuum advanceis good. Your guys thoughts? Link to comment Share on other sites More sharing options...
Dred_85.5_TSI Posted October 23, 2010 Report Share Posted October 23, 2010 I think the knock sensor can do that Link to comment Share on other sites More sharing options...
Indiana Posted October 23, 2010 Report Share Posted October 23, 2010 remove all the vacuum hoses on the throttlebody except one for the vac. adv. and cap all the rest and drive again. Leaking BOV will do this too. Higher rpms and steady throttle there is enough engine vacuum to suck open slighty most BOVs especially those DSM ones and you are leaking out a large volume of air that has been metered. Check it, hold the rpms around 2500-3000 steady and place your hand over the BOV and if you feel any air leaking you need to correct that. Every time you just slightly lift the throttle that will suck open even more, a BOV has no reason to be doing this and most are because their springs are way too weak. Link to comment Share on other sites More sharing options...
scooterh72 Posted October 23, 2010 Author Report Share Posted October 23, 2010 remove all the vacuum hoses on the throttlebody except one for the vac. adv. and cap all the rest and drive again. Leaking BOV will do this too. Higher rpms and steady throttle there is enough engine vacuum to suck open slighty most BOVs especially those DSM ones and you are leaking out a large volume of air that has been metered. Check it, hold the rpms around 2500-3000 steady and place your hand over the BOV and if you feel any air leaking you need to correct that. Every time you just slightly lift the throttle that will suck open even more, a BOV has no reason to be doing this and most are because their springs are way too weak.I am not running a bov Link to comment Share on other sites More sharing options...
Cobalt60 Posted October 24, 2010 Report Share Posted October 24, 2010 My car has somewhat of a similar issue. However, my car will surge clearly when I try to apply only a small amount of throttle. I am thinking a good first step is to get a new throttle cable. Link to comment Share on other sites More sharing options...
scooterh72 Posted October 24, 2010 Author Report Share Posted October 24, 2010 (edited) So I probably still have some vacuum leaks....... The car wants to cough and sputter until it warms up a bit. Is this normal. I do have a new cts. Car will idle up around 1500 rpms when first starting.Thanks again for the help. Edited October 24, 2010 by scooterh72 Link to comment Share on other sites More sharing options...
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