Quote:
Originally Posted by Sbrown0221
LOL, well i guess that's what happens when we learn all we know from WWII era mechanic as I did. Bless his heart he doesn't know today's cars but has tought me enough to not ignore a issue and to maintain a vehicle.
I really apprecaite the detailed expaination and I will do as advised. I 'll keep you updated as to my progress through this issue.
I was thinking though, if it is a vacuum leak wouldn't it be doing it all the time, even when it's cold, which is not the case?
also, is it okay to replace those hard plastic vacuum lines with straight vacuum hose, or are they hard plastic for a reason?
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rubber lines can be replaced with plastic tubing or even metal.
with many angles best stick to rubber.
my vacuum troubleshooting is actually a 1960-1990 era proceedure for vehicles with carbs.
with fuel injection you can get away with some vac leaks. looking at the new vehicles not many vacuum lines at all. mostly vacuum leaks on the newer engines is the intake gaskets.
with a carb if you have a leak the engine cannot suck fuel out of the carb as well. then the lazy mechanic or DIY messes with the carb mixtures to get it running smoothly to compensate for the leaks.
this causes many problems and reduces engine life. with fuel at 50 cents a gallon burning some extra fuel was not a big concern back then by not locating ALL these leaks.
I have been lucky I guess over the years with engines/vehicle performance. I get over 10 yrs on my vehicles and shoot for 200,ooomi.
if you do your own work and have the ability to follow the OEM shop manual you will know more to keep your vehicle running properly and the proper proceedures to do it than the pro's .
these forums are not a place to get all the info needed to properly keep your vehicle running as best it can . its a start to get you moving in the correct direction.
when the engine is cold the computer control is not that critical on the fuel mixture. you can get away with a vacuum leak. as the idle drops then you get these issues.
the crankcase venting system PCV / hoses can also cause this. the IAC adjusts to maintain idle speed. if the air/mixture/vacuum leaks are to great then the idle cannot be controlled by the computer/IAC etc...