So I pulled my intake and accessories off over a year ago with plans to do a quick cam install. In the middle of the process my son’s truck dropped a cylinder and all extra time and money went to that.

I now have the cam installed and have some mystery bolts that I’m hoping you guys can help me place as I am putting everything back together. Here are the first two. They go in or around the fuel rail. I appreciate any and all help.

thanks,
Joey.

 

TPS

 

Awesome. Thank you. I'll have some knew bolts listed soon. These are torx head bolts but they are flat instead of kind of rounded. I have 4 of them I believe. I can send a picture when I get home.

 

I said I had 4 of these but I actually have 5. Any ideas?

 

I don’t recognize those, engine parts that use torx on tpi. Fuel rail, tps ,intake to head, plenum
and runners, front accessory brackets on 89-92 tpi

 

I've looked all over my engine and engine bay, and I don't see any bolts like those. They look kind of hefty in your hand, not small like the fuel rail and TPS bolts. Are the seat belts installed in the car? They look like seat belt bolts that bolt into the floor.

 

maybe top bolts for the runners to plenum? Seatbelts are in car. The only things removed were front brackets, plenum, runners, fuel rail, intake, valve covers.

 

The runner/plenum bolts were originally black oxide button cap torx bolts, like the valve cover bolts, and there would be more than 5 of them. The head on those look like they might be the right size, and if you're not the original owner, then someone could've changed them in the past. Have you tried to screw them into the plenum to see if they fit?

 

What size Torx bit fits in the head?

 

From the size, they look like the runner to plenum bolts. However, like mentioned above, the original bolts were cap head torx, not square head. The previous owner changed them out for some reason. If they were a lot smaller, I’d say they are the TPS and TB top plate bolts. Unless, that is you have very very very small hands…lol!

 

They are bigger than the plenum/runner bolts. They are the same size as the intake and bracket bolts.

 

Could the bolts in question be for the intake manifold to cyl head? They look to be the right size. Of course, you need more than five.

Fred

 

Metric or SAE thread?

 

Throttle cable bracket?

 

Yep, but you’re missing one bolt. Throttle cable bracket takes 3 bolts.

 

Found it. Thank you. I’m missing something here. lol.

 

Cold start injector timer switch, just plug with npt 3/8 plug iirc

 

any ideas on the two threaded holes above that?

 

For a corvette fuel rail

 

Cold Start Injector switch. If you'll be deleting the CSI with a custom tune, then just plug the hole. Another option for that hole if you're deleting the CSI switch could be to relocate the fan switch from the passenger side cylinder head, where it will always be easy to access in the future, being right in front.

 

It has a updated 89 based tune

 

...Just like my '86, but that it also still has the CSI installed and active. It always starts, and never floods. IIRC, I set the cold enrichment light but not to zero. It's semi- psuedo- nearly- almost original that way, a little.

 

Ok, This is probably a dumb question but where in the hell does the brake booster vacuum line connect to? 1988 Pontiac GTA LB9.

 

Drivers rear of plenum there is a nipple there.

 

Ok fellas I have no spark. Just changed the distributor any initial ideas. I did ensure the ignition module which came with the new distributor is plugged up.

 

Koeo power to the pink wire at icm from coil ?

 

what you mean that the other end of that doesn’t go to the air temp sensor in the plenum for the egr? I’m such a dumbass.

 

The plug in is the same for mat but that won’t power the icm

 

i need this **** color coded and like computer wires. They only fit where they are supposed to go. lol.

 

I’m think it is colored. Icm is pink and maybe white, mat is a pigtail tan and blk

 

This is the one that I had plugged into the icm. I’m assuming it plugs into the temp sensor.

 

Is it on a shorter pigtail, almost looks like yellow and blk for cts

 

This is what it runs to.

 

That’s mat under the plenum .

 

she started!!! Now what do I disconnect to set base timing?

 

The single wire tan blk next to the heater core

 

Got it timed to 6 deg before. What would keep my fans from running?

 

It’s been so long since I did a start tune it could be a fan switch tune setting , bad cts reading or bad ecm
or connection with prom. Does it go into diagnostic mode and blink a code 12 ?

 

Jumper the aldl a to b does the primary fan come on or are they running continuously?

 

Apparently I just didn’t let it get warm enough. They are working. Here are some data dumps. See anything crazy. This was with the car idling.

 

O2 not ready ? So I guess this isn’t cl, if you want to use tp rt in cl id be more than happy to view idle and driving.

 

This was from a snap-on modis edge scan tool.

what are cl and tp and all that?

by the way what’s your Venmo. You’ve been tons of help.

 

To tuner pro rt, cl closed loop like the o2 isn’t moving

 

I will get the data. Pm me your Venmo if you have one.