Jaredk

I have been searching for an answer the past week without answer and now the running condition is getting worse.

Its an '89 4x4 pickup with 22re engine and 5 spd. Experiencing a misfire after warm up and during idle. It was not so bad but has slowly gotten worse. I was taking a look around and I can hear what I think is a vacuum leak. Saw that there was this valve or purge on the fuel rail, has three hoses coming off of it. I noticed it was sucking air so i plugged it up and I can still hear a leak but can not see the culprit anywhere. Was hoping someone could tell me what this is and what it's suppose to connect to.

I already checked compression, plugs, replaced cap rotor and wire. I am hoping this is it.

Thank you. Jared

aquaprice

That port is not used on the mt's. If I remember correctly it is used on auto trucks.

peow130

intake gasket leaking?
throttlebody gasket leaking?
check all that stuff. are you pulling any codes?
if so: code says youre running lean, but it's actually dumping raw fuel out the exhaust? then you have unmetered airflow through the engine that the o2 sensor is picking up on.

Jaredk

I am not pulling any codes. I tried squirting some carb cleaner around the gasket areas but I didn't have any change to the idle speed. I will try searching for a leak again. Any other suggestions on finding a leak other than the carb cleaner technique?

peow130

any liquids dripping off the bottom of the intake plenum?
hows the O2 sensor look?

TNRabbit

Are you saying you still hear a leak?

Use an UNLIT propane/MAPP gas torch to check where a leak is. Run it around ALL hoses (including VSVs) & it will idle up slightly when you find the leak.

Jaredk

Yes, I am still hearing the leak. it sounds like is comig from somewhere behind and underneth the intake/head area. I am starting to think its a blown gasket or warped head. I'll hope for the best until I confirm it. Thanks for the tips. I'll let you know what I find.

Jaredk

We found the vaccum leake. It was on the back side of the intake manifold. Whoever work on the truck last was a real novice and wrinkles the gasket or something. Also looks like they tried to use a liquid gasket.

peow130

See post #3
You're welcome.