Fuel Pressure Regulator

[sleep_deprived129]

I have an '88 3S-FE Camry. It has failed emissions on both HC and CO at both idle and loaded. It also seems to get relatively poor fuel economy (averages 24mpg on a 5-speed, my '91 auto even did better). The car is definitely running rich just by the smell of the exhaust. In checking things out, I pulled the vacuum hose off at the fuel pressure regulator and smelled a hint of fuel odor, is this normal? I'd rather not spend the 50 bucks for a new one if it is not needed.

Also, are there any other things I should do/check? It also failed back in May and I did the following:
-Plugs and wires
-Engine temp sensor
-Vapor canister (Not new so could still be the issue)
-O2 sensor

[itainthem]

Have you tried leaning the mixture? If u break the seal on the AFM you can lean it out by 2 to 4 clicks clockwise is lean... Counterclockwise is richer... Try leaning it a few clicks...

[sleep_deprived129]

Where would I find the adjustment on the afm? I was always under the impression that the mixture on EFI is not adjustable.

[Doctor J]

As long as you do not see a liquid fuel from regulator sensing hose, it is acceptable.
You need to check voltage feedback as desribed in oxygen sensor testing [changing the O2 sensor will not necessary fix the issue)
you also need to check the fuel trim at idle (done similar to O2 checking except the test (T) terminal is not jumped to the ground E1 (0 volts indicates rich condition)
Assuming your spark plugs were all dark brown (but not sooty-black) to rule out leaking injector and your car is running in open loop (as indicated by O2 sensor check steady needle + rich fuel trim),
drill the round aluminum plug on the AFM and using the screwdriver, open the air-bypass channel on afm(this is how it done professionally)
however, doing so may cause "tamper" failure
Normally, if engine runs in open loop and spark plugs are not black, inspection of the coolant thermosensor, thermostat, and engine fan controls (to assure that fans are not running all the times) is necessary
My car passes with plugged up charcoal canister (but it runs more on lean side-5v-3.5v fuel trim)