This is on a 87 z28 tpi
help.
I found a connector that is not hooked up. I searched e-bay and found it, I think.
this it what it looks like

(look on ebay)
# 8006769601
TPI TBI Camaro Wiring Harness EGR Connector


Its in the back of the motor, where does this thing hook up???
this could be my EGR problem.
I do not have the little temp switch hooked up to the egr, but I didn't know about this other loose pig tail, I don't know where it goes.
can you tell me ???
thanks
scott

 

Ok, egr solenoid has two very small vac lines and one vent hole.
I didn't see a place to plug in a two prong plug.
thnaks
scott

 

anybody know?
maybe a pic?

 

Definitely sounds like your EGR solenoid connection! Its wires are black and grey correct?

Look on the bottom side of the solenoid, you'll see the place for the connector there.

Gotta hook up that green wire to the EGR temp switch too, or your EGR will not work correctly.

 

Could this be related to the searching Idle???500 to 1800 rpms
Egr temp sens wire is green?
thanks
scott

 

wow, all colours of the rainbow it seems for wiring hookups...

EGR Solenoid will have 2 hard vac lines connected to a rubber L hook up on the solenoid that run underneath the plenum. It should be located directly underneath the ignition coil. The ECM connector comes out from the back of the engine off the main set of wires directly behind the distributor. It is a small 2 prong hookup that hooks up to the bottom of the EGR solenoid. The wires (on an 88 T/A TPI) are pink and grey with a black line in it.

The connector prongs should be rounded with a clip on the top.

I do believe though, you need the EGR temp sensor (the little silver hex head sensor that plugs into the brass diaphragm) in order for the EGR to work properly. The hex head black wire clip is a single wire that connects onto a green single pronged weatherpack on the drivers side of the wiring harness.

I'll post a picture of what it looks like when I get home to see if that is what you are looking for?

 

Could this be related to the searching Idle???500 to 1800 rpms
???
thanks
scott

 

vacuum leaks generally lead to hunting or rough idle.

But so do a bunch of other things that I really don't know much about.

Camera has dead batteries, they are just charging so i'll post a few pics later tonite!

 

I took another look at the egr, solenoid, the electrical connection is plugged in.
It is a black wire with purple strip. and a solid gray

So I have no idea where this other wire goes?
The connector looks the same as above but its a white w black stripe and a black wire, it has one of those weather proof green things on the end.

Also I believe I have the egr temp wire hooked to the o2 sensor.
Its a black wire but turns green after the little connector.

So That mean I am missing the o2 wire. Man....I seem to be having are hard time with this thing.
so where would the O2 wire be? Maybe it got ripped out.

Man I need help.

When I disconnect the iac it still surges at ideal.
But when I disconnect the little timing wire on the fire wall it smoothes out good.

 

ok so the EGR is hooked in, thats good

The O2 wire should be wrapped around the bottom of the block near the pass side head/manifold.

It should be a purple wire with a black stripe through it. The EGR one should be a green one up top near the break booster.

will take a few pics in a bit when batteries are charged of all the connectors and where you should normally find them. Patience i'll try to help best I can!

 

did you have your plenum off recently? check to see if it is the air intake sensor. this is on the bottom of the plenum. the connector looks similar.

 

Yep I did have it off, but its is hooked up.
that temp sensor is a little different, it has a oval shroud on it.
this other conector is a two prong and has a weather protector on the end, it looks like one that goes on the back of the distributor.
???
thanks
scott

 

I have this on my car, as do many others. It's the infamous "mystery connector". It does nothing, and goes nowhere. Best guess is it's a factory test connector of some sort....possible for during manufacture?

 

well it may be for an accessory that your car didn't come equipped with? Thats a possibility. You know, develop the wiring harness for all the possible options/sensors and only use those that are for that specific model?

Do you still need those pictures of the connectors scott?

 

No I don't,
I don't believe its related to my problem.

But I did fix one of the fans tonight, bad relay. waaahoooo.
small but it helps....now it doesn't heat up as much.
about 180 deg.

I get all my moates stuff tomorrow, 250 bucks in one shot.
computer should be here as well.

Then maybe I can do some mapping to find out whats going on.
I know that it does not do it when its cold, but when it warms, man, it swings from 400 to 1800 or so.

I bet its o2, or egr stuff.

maybe my injectors are leaking??

thanks for the help, I need it..(Iam stressing)


thanks
for the help guys.

 

Un plug your o2 sensor and see if the idle stays level. This is forcing the car to stay open loop therefore adding more fuel. If the idle problem goes away (or improves alot) then plug it back in. If your idle problem returns there is a good chance you have some bad injectors that don't flow well at idle with lower injector pulse timing in closed loop. Does it blow a ton of black smoke when you restart it after it has sat for a while? Also, MAKE SURE you don't have an intake leak. This is a very common problem causing a surging idle. I wouldn't want to invest in new injectors just cause you have a vacuum leak.

 

something that can cause a surging idle that i found out today is a maf sensor going bad. switched mine out and it runs great. although you might want to try the cheap stuff first unless you can get one that you know is good to try.