Throttle Body Rebuild

Topic: Throttle Body Rebuild (Read 818 times) previous topic - next topic

Throttle Body Rebuild

March 29, 2010, 12:45:52 PM

1984 3.8L.

Reason for rebuild.
1) Low fuel pressure (about 30 psi)
New high pressure pump about 3 years old.
2) Fuel seems to be leaking back to tank --s/b pressure regulator
(To get a screws body needs to be separated.
3) When pulled fuel inlet line and did volume test (volume OK) noticed two
little pieces rusty metal in container.
4) Never been rebuilt.

Questions:

1) Should I get new injectors or just have them tested?
2) Understand screens in injectors -- should these remain or discard them
whether new or rebuilt injectors?
3) Since rusty metal, should I drop tank and coat before doing TB?
4) Other input?

Thanks
David

Throttle Body Rebuild

Reply #1 – March 29, 2010, 05:30:20 PM

ive seen it said here many time to omit the screens, never had mine apart but what harm can it do?
i would drop the tank and have a look if i found rust(pieces) in my fuel.

Throttle Body Rebuild

Reply #2 – March 29, 2010, 06:21:20 PM

I would install new screens in your old injectors.... I get mine at the local NAPA for about $1 each

they are there for a reason, to keep the crud from locking up an injector....

Throttle Body Rebuild

Reply #3 – March 30, 2010, 08:31:50 AM

Thanks both for feedback.

BogusSVO:

The debate I'm at right now (170,000 miles on injectors) is:

1) Just attempt to clean the injectors myself and put new screens in (I agree with you they are there for a reason)
2) Have them cleaned and volume tested (about $35)
3) Buy new injectors (about $50).

For the price difference between clean and new, new injectors seem the way to go.
However if old still good -- why bother -- but hate to rebuild the TB and then have to
tear it back apart.

Also if tank is an issue, could clog new or old but more concerned the fuel filter didn't catch the two flakes I found. Otherwise no junk (rust, fine particles, etc) in gas.

Throttle Body Rebuild

Reply #4 – April 01, 2010, 03:50:10 AM

speaking from experience

Throttle Body Rebuild

Reply #5 – April 01, 2010, 11:25:27 AM

JCassity:

Nice pics of a TB. Was familiar that screw to separate the TB are underneath gasket between TB and Manifold. Based on my research, decided to pull the gas tank first and clean it before I mess with the TB.
Changing gas filters about every 10,000, which seems to frequent, coupled with the fact I don't want any dirt getting to the TB.

First gas tank I've had to deal with, so climbing the learning curve and not looking forward to the job.
Decided to run it down to a radiator shop instead of messing with cleaning it myself.
One uses muratic, the other steam. Thought I'd go with the steam as muratic will definitely require the tank to be recoated on the inside. After steaming, if issues, figure I can then go the muratic route prior to install.

Any input, if you've done this job, appreciated. Especially of interest is getting off pump retainer ring (see other post) and any other specialty tools I need before I start.

Throttle Body Rebuild

Reply #6 – April 01, 2010, 09:27:30 PM

Quote from: dw85745;316483

Thanks both for feedback.

BogusSVO:

The debate I'm at right now (170,000 miles on injectors) is:

1) Just attempt to clean the injectors myself and put new screens in (I agree with you they are there for a reason)
2) Have them cleaned and volume tested (about $35)
3) Buy new injectors (about $50).

Where are you getting an injector for $25? They normally run $50-100 each.

Throttle Body Rebuild

Reply #7 – April 03, 2010, 01:34:32 PM

JeremyB:

Need re-read my post - the one you quoted?