Taz...don't take the codes to heart. Just because it says a vacuum problem does not mean that it is a true vacuum problem. Here's the scoop..the SMEC only sees electrical signals, it does not have any way to actually monitor vacuum. So what the computer is telling you is that the symptoms appear to be vacuum related by the way it's reading the electrical feedback from the sensor. MAP sensor signals have also been known to change from bad vacuum hoses or contaminated hoses. Always replace the hose and I dont recommend using any sort of cleaner in the hose as this can contaminate the MAP. During periods of acceleration and deceleration your vacuum continuously changes and this can actually force dirt and liquids back into the MAP when the throttle closes abruptly and vacuum changes. There are a number of Service Bulletins out about some of these types of problems and one which is really bizarre is when moisture gets trapped in the vacuum hose/MAP and freezes during cold weather...this can block the hose or freeze the MAP and give no starts, hard starts and poor performance until it warms up. Computer codes and CEL lights are only designed to get you somewhere in the area of the fail, after that you have to examine the entire circuit from sensor to SMEC which includes high resistence in connectors, this can skew the signal to the SMEC also.TaZMaNiaK said:
Try replacing the hose and check the vacuum reading at the source on the manifold. After you replace the hose clear the codes and see if 13 comes back. You could change the MAP also but they run about $60. Good luck.
