low and rough idle on 1996 Volvo 960

My Volvo 960 idles low and rough. The diognostic code is PO172. (fuel too rich) it's either too much fuel or too much air, according to the auto part store. I think it might be the intake manifold gasket. Is this accurate, or am I missing something?

by in Dalton, GA on April 03, 2010
2 answers
ANSWER by on April 03, 2010
An intake manifold gasket implies a vacuum leak. It is possible that there is a vacuum leak, but there are some other things that could be wrong as well. 1) TPSensor 2) O2 Sensor
ANSWER by on April 04, 2010
A leaking intake manifold gasket is very common on this engine. The way I find it is to get a water bottle and spray a stream of water around the intake runners where they attach to the head. They normally leak at the ends,, near the #1 or #6 cylinder intake runner. If the gasket is leaking, the engine will stumble when the water is drawn into the cylinder from the vacuum leak.
Related Items:
For the last few months the performance of my volvo 960 has just gone DOWNHILL. Since I purchased the car really. But most recently it started with a rough idle. Random misfires. Compression low in...
idles rough and low at traffic lights to the point it almost turns off but it never has. Once in a while it will sputter when taking off and stalls (not good) Doesnt seem to do it once its up and ...
My 97 Volvo 960 started rough idling yesterday. The check engine light is always on, but with t...
I got this car and got it smogged on Saturday, but on Sunday afternoon my check engine light came on. I took it to a shop and they ran a diagnostic and told me I had a bad EGR system. However with ...

Related Content