wont run with breather unit unhooked

[drankmyfaceoff]

my 3.0 v6 is running rough at idle and when I unhook my breather unit it stalls out. was gonna spray with seafoam but kinda hard without it running.

[IronNam]

readjust idle?

[drankmyfaceoff]

it just shuts right down. its very hard on gas as well its flooding itself out

[new echo owner]

Which breather are you talking about? Sounds like you have disconnected the intake duct, which connects to the MAF, and of course it will stall the engine. Try a small vacuum hose.

N.E.O.

[drankmyfaceoff]

yes your right im new to this toyota thing. I have no check engine light at all. the motor is flooding very bad at idle but runs ok when I rev it up. its really hard on fuel thanks

[new echo owner]

Unlike the 3.4, the 3.0 doesn't have ability to detect engine misfire so it won't set a code or turn on the CEL, unless the O2 is detecting a rich exhaust.

Find out what your fuel pressure is will help you figure out what the cause maybe, if your regulator is not functioning properly it will cause a rich condition. Of course there are other things that could cause a rich condition but knowing where your fuel pressure is at would be a good way to eliminate a few of the causes.

N.E.O.

[knj27]

If your engine is running that poorly, seafoam is not going to solve your problem, although it can't hurt. Suck the seafoam through the main brake booster line, slowly, and give it gas when it bogs, which it will. Pour half the can in your gas, suck the other half (8 oz. of it) into the brake booster line. Then let sit for 10 or 15 and then drive around like James bond with a smokescreen. Although you'll need to find out why it runs crappy. Give it all new ignition parts, and check the air filter, as the easiest ways to begin.

[Jayota]

Check your o2 sensor, Check your VAFM (check out the FSM for proper readings with an ohmmeter).

As mentioned, its perfectly normal for your engine to stall once you remove the intake. Creating a leak in the intake causes it to lean out and stall.

[drankmyfaceoff]

what is a VAFM and where can I find it?

[drankmyfaceoff]

the truck is flooding itself when my foot is off the gas. thanks for the help.

[new echo owner]

How does it run when it is cold? Does it have fast idle? If the fuel pressure is good, you might have a cold temp sensor stuck in high resistance making the ECU think that the engine is still cold. The sensor is at the back of the engine behind the intake, check the resistance both cold and hot.

N.E.O.