emission issues.po172 left

curtismc56 · Post by **curtismc56** » 07 Aug 2011, 07:44

98 s70 100k+. Replaced the MAF twice, Front O2 sensor now the only one left is PO172. Sprayed ether gently around vacum lines, no increase in rpm's. Where do I go from here.

curtismc56 · Post by **curtismc56** » 07 Aug 2011, 09:32

As jblackburn suggested, I replaced the elbow coming off the vacuum mod. Replaced the 2" intake to exhaust tube. Whats next?

Post by **jblackburn** » 07 Aug 2011, 17:46

Is that same elbow connected at the other end? Any leaks coming off the bottom of lines connected to the intake manifold? Fuel pressure regulator?

Is this a turbo motor or non-turbo? If it's a non-turbo, the FPR is near the fuel tank on the right side of the car.

gilhuly · Post by **gilhuly** » 07 Aug 2011, 20:22

If you're not hell bent on doing it the hard way go to an idy garage with a smoke machine. You'll have your answer in 15 mins.