2002 Toyota RAV 4 4 cylinder rich un-burnt fuel smell

gfox45

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What are the possible causes for a unburnt raw fuel smell? Engine not misfiring. Getting 18 mpg.
 

Jim Fairbanks

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Are you sure you don't have a leak in one of the lines or pressure regulator?....maybe a plugged return line....Jim
 

gfox45

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I'm not sure but I will check. But It doesn't smell like gas, it's a rich fuel smell coming from the exhaust.
 

Jim Fairbanks

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You might have a bad coolant temp sensor,or a problem with the evap system,there is a tsb about a damaged fuel tank vent hose..is the CEL on?..........Jim

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gfox45

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The codes are PO 171 and P1130. o2 sensors. plugs, wires, cat. converter,have all been replaced.
 

Jim Fairbanks

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You might want to check your MAF..it could be causing the problem..Check it and if it is bad replace it and clear the codes and see if they come back.....Jim.......MASS AIR FLOW (MAF) METER

INSPECTION


DISCONNECT MAF METER CONNECTOR
REMOVE MAF METER Remove the 2 screws and MAF meter.
INSPECT MAF METER

Using an ohmmeter, measure the resistance between terminals THA and E2.
Resistance:
If the resistance is not as specified, replace the MAF meter.


Inspect the operation.
Connect the MAF meter connector.
Connect the negative (-) terminal cable to the battery.
Turn the ignition switch ON.
Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
Blow air into the MAF meter, and check that the voltage fluctuates. If the operation is not as specified, replace the MAF meter.
Turn the ignition switch OFF.
Disconnect the negative (-) terminal cable from the battery.
Disconnect the MAF meter connector.
REINSTALL MAF METER Install the MAF meter with the 2 screws.
RECONNECT MAF METER CONNECTOR





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