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.
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Re: 02 Trooper intermittenly dies on idle.
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?
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.
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P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
look for 02 sensor bank 1 and 2 data
hope it helps
Determining exactly what of the thousands of parts on a modern car is broken is as difficult as doing the repairs many times. IN this video you'll learn how to diagnose and fix error codes P0171 and P0174 on a 2001 Ford Escape, which indicate vacuum problems.http://www.lightdeal.co.uk/
There could be many issues. These codes read your engine is running too lean. Check : all your vacuum hoses for leaks, PCV valve and hose, MAF sensor. This may require an experienced technician to figure this out. Hopefully I help'd!!
If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.
Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.
p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2 Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.
Tose are lean codes the 02 sensors are seeing a lean condition and likely its the mass air flow sensor or the intake hose to the engine is loose or cut.
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