Question about 2002 Isuzu Trooper
I took it to Autozone and it gave the codes p0171 and p0174. I did use a lucas gas addittive hoping it would help..no luck. If it is the 02 sensors, Where are they located and how difficult to rplace?
It only has 42k miles on it.
Thanks to anyone who can help.
This maybe due to an intake gasket leaking vacuum and causing a lean air-fuel mixture. Check for a vacuum leak where the lower intake plenum meets the cylinder heads. Separating the upper and lower intake manifold is not necessary. These gaskets are plastic and metal. The plastic gasket cracks causing a vacuum leak. This is an unmetered air leak and may cause fuel trim codes like PO171 and Po174 to set. There is an updated gaskets to repair the problem from Isuzu. These codes are for a lean fuel condition, not bad O2 sensors. Do you also have a rough idle?
Posted on Jan 27, 2009
Ewashmidas is exactly right. I have replaced the intake manifold gasket 4 times in a 1999 Trooper. Only last repair did I learn there is a TSB from Isuzu specifying 13 ft lbs of torque on bolts vs previous specified 18 lbs. Over tightening the bolts appears to be what is cracking the plastic gasket.
Posted on Jul 02, 2009
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Posted on Jan 02, 2017
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