86 4runner, terrible MPG and fells underpowered
#1
86 4runner, terrible MPG and fells underpowered
I have a 86 4runner with 22RE and lately my fuel economy has dropped significantly, and at times it feels very underpowered, almost like it is running out of fuel. Any ideas?
Plugged CAT maybe or bad fuel pressure regulator?
How can I test for these things?
Thanks for your help.
Plugged CAT maybe or bad fuel pressure regulator?
How can I test for these things?
Thanks for your help.
#2
Registered User
To test fuel pressure, you'd need to hook a gauge up inline with the fuel supply line. Not sure how you'd go about testing a cat, maybe try taking it off and see if the truck runs better? I think the o2 sensor is before the cat, pulling it may also let you know if the cat is clogged, if it runs better with the opening in the exhaust before the cat. Someone else may have more ideas of what else you could check.
Last edited by az4x4runner; 06-10-2010 at 07:58 PM.
#3
Registered User
Here is the FSM page that describes testing fuel pressure at the cold start injector supply pipe.
http://personal.utulsa.edu/~nathan-b...28fuelpump.pdf
http://personal.utulsa.edu/~nathan-b...28fuelpump.pdf
#6
Registered User
Bad pump would cause inadequate fuel pressure, and all the bad things associated with that. Rough starts, poor mpg, etc.
I would check out the fuel filter as well, its a PITA to get to but it could be clogged
I would check out the fuel filter as well, its a PITA to get to but it could be clogged
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