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CEL on, codes P0172 and pending P0301 S70 1998

posted by  KlausC on  Tue Jul 17 12:44 CST 2018
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last visit: Fri Oct 24 10:15 CST 2014
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I have never figured out how to 'smoke' the intake manifold, as some of the valves are open and the air will leak out through the exhaust.

Check the hidden vacuum elbow next to cyl #1. The hardest to replace and see.

If the front O2 sensor is over 125K, then it is time to proactively change it anyway. Not terribly difficult, if you have a good 7/8 socket made for the sensor. The rear sensor usually lasts a very long time.

The ECT sensor can be checked with a multimeter. Unplug it and check the Ohms at various temperatures. Cold = 7300, hot = 300.

Your MAF should still be good, as should your fuel pressure.

Go ahead and check the spark plugs, clean them. If they are copper plugs, keep them, anything else, get new plugs.
--
Keeping it running is better than buying new






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New CEL on, codes P0172 and pending P0301 [S70][1998]
posted by  TheBrickTank  on Tue Jul 17 05:10 CST 2018 >


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