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Old 05-10-2004, 04:30 PM   #1
760T man
Phillip Mamouf-Wifarts
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Join Date: Nov 2002
Location: Bettendorf, IA, when I'm not EASTBOUND 'N DOOOOOWN LOADED UP 'N TRUCKIN'
Default How to install Brown Tops on LH 2.2!

Several people, including myself, have found old browntops to occasionally leak right around where the brown plastic top meets the metal injector body. BE SURE to check this on the first startup. Don't panic, though. Just get as many as you can, and if you have leaks, find the ones that don't leak.

>If you have a question and need a quick response, please send me a PM!<

Alright, this is pretty easy, but I figured that our newer crowd would appreciate an easy to find write-up on how to do it.

357 injector vs. Brown Top injector.

This is what greets you when you open the hood:

1. Depressurize the fuel rail. This can be done by pulling the fuel pump relay and in-tank pump fuse while the engine is running. Or, you could just let the car sit for awhile (a few days), if you have the time, but you probably don't. Or at least you don't want to wait that long.

2. Disconnect the injectors. Mark each line with masking tape so you remember which one goes where.

3. Unbolt the fuel rail, and remove any vacuum hoses that may obstruct you when pulling the rail.

The fuel rail and its 3 bolts.

4. Pull the fuel rail with the injectors still attached. Spraying a penetrating oil (ie PB blaster, rost off, or similar) at the base of the injectors and wiggling them a bit will make life a lot easier...but whatever you do, DO NOT let the injectors come out of the rail first - fuel will spill everywhere.

5. With an old dirty rag handy, remove the injectors from the fuel rail. They'll require a good bit of wiggling to get them out. I recommend wrapping the rag around the injector and the fuel rail while doing this to prevent excess fuel spillage.

6. Install the browntop injectors; Make sure all the O-rings are new. Vasoline works wonders for popping them in - but make sure you feel them pop in. If not, they won't seal properly.

7. Reinstall the fuel rail. A nice firm push above each injector will pop them into the manifold nicely. Reconnect any vacuum hoses you had to disconnect, and reconnect the injectors.

Alright, take a deep breath, the "hard" part is over. Also, if you have LH2.4, you're done with the entire proccess. LH2.4 automatically does everything else for you.


Now that the browntops are installed, your base idle is off, regardless of how it was before.

You need to either go buy the Volvo special tool part #9995280 for $35, or build it yourself using Radio Shack parts for about $5. I chose the latter. You'll need 7 10ohm resistors and an LED assembly (any color, it doesn't matter, choose what you like).

Build it as shown:

The resistors MUST be on the RED(+) lead. The light will not work if you put them on the black(-) lead.

Now you're ready to adjust your base idle.

First, you need to locate this connector, it's on your passenger side fender near the AMM:

Ground the red/white wire. The idle should drop. Go to the Idle Air Screw on the underside of the throttle body and adjust it(lengthen = faster, shorten = slower) until the idle is ~725 RPM, then disconnect the red/white wire you grounded before. The idle will surge, then settle, which is normal.

Adjusting the Idle Air Screw.

Now, hook up your test light we built above to the green/white wire. For a lean mixture, the light will be OFF. For a rich mixture, the light will be ON. The light will blink on and off at equal intervals when you're dead on. Adjust the screw on the AMM until the light blinks; counter-clockwise is rich, clockwise is lean.

The screw on the AMM.

Disconnect the test light and you're done! Enjoy your new found fuel (and more than likely increased boost ).
a '90 765ti, an '84 244ti, and an '18 780

Turbocharge it, and instead of the typhoon, or syclone, we will call it the “light breeze” -mrsam740 referring to the Oldsmobile 4.3 diesel

Last edited by 760T man; 12-23-2011 at 05:42 AM..
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