timfitz63

Did a quick search of the TPI forum, but didn't come up with anything obvious that seemed to collect all of this knowledge in one place.

I'm going to be replacing all of the fuel injectors in my LB9 TPI engine soon. I intend to get a shop manual before tackling this, but would like to get a head start on collecting all of the necessary parts to accomplish the job. The goal will be to keep everything as close to a stock set-up as possible.

I've already been given recommendations for replacement injectors, so aside from those obvious parts, what other parts will I need? It's my understanding that the intake plenum has to be removed, so I imagine there's some gaskets/seals that will need to be replaced? What's a good source for those? Anything else that will be needed (fasteners that may be broken in the process of disassembly, etc.)? Any general insight or pointers about the job are also appreciated. Thanks in advance!

IROCgiraffe

iTrader: (3)

Covered many times. Plenum, runners need to come off. Find Fel-Pro plenum gasket set on RockAuto/Amazon. May want to replace fuel pressure regulator diaphram while you in there. Torx headed bolts holding plenum in place. Replace o-rings for the fuel lines (feed/return), bought them @ Advance Auto. Bought the diaphram and injectors thru SouthBay.

southbay08

you beat me to it IROCgiraffe

MrPackstin

iTrader: (9)

Maybe, you could toss on a new EGR valve... while there.

timfitz63

Thanks for the input, guys! All suggestions taken under advisement. Sorry 'bout covering old ground; guess I wasn't diligent enough in scouring the forum.

IROCgiraffe

iTrader: (3)

It's all good bruhhhh

We work as One TEAM!

Base91

iTrader: (1)

Be fairly gentle with the o-rings and keep everything clean clean clean!

timfitz63

Wilco! Thanks!

IROCgiraffe

iTrader: (3)

Motor oil on the o-rings worked well for me.

TransamGTA350

iTrader: (2)

The above comments are good. Here are a couple of other hints.

There are bolts on the inside of the lower plenum to runner connection. They thread into the runner flange through the lower base flange. Don't overlook these.

When you put it all back together, place the fuel rails and injectors lightly into the lower base, but not all the way. Then set the runners in place with bolts, but don't tighten all the way. Then push the fuel rail down to seat the orings. Install the upper plenum and runner bolts. Now evenly tighten all runner bolts in a cris cross pattern and torque to spec.

Don't forget about the wiring connection and vacuum lines under the plenum as you are putting it back together.

It's not all that bad once you know the assembly order.

timfitz63

Thanks, guys! With all this good advice, the only way I won't get it fixed is if I'm simply lazy about trying...!

timfitz63

I believe that I've isolated all of the other suggested replacement parts, but need some additional guidance here; there appears to be several o-rings/o-ring kits that are offered for the fuel system and fuel rails, and being a novice at this I'm a bit unsure which o-rings I'm actually looking for in this case...

The manufacturer of the replacement fuel injectors says that they are supplied with the necessary o-rings for their installation, so all I need is someone to point me at the appropriate replacement o-rings for the fuel lines (feed/return) and/or fuel rails (if necessary). Thanks!

Tuned Performance

iTrader: (92)

the o-ring kit from autozone is gp soresen 800-9211



http://www.autozone.com/autozone/par...ier=79645_0_0_

timfitz63

Outstanding! Thanks!

jjcuff1

I just went through this last weekend and had some concerns and problems during the process but it was fairly easy. See my otehr post with some pics before and after.

get all the parts above and I found a 3"extension, 1"extension, swivel joint with a 40mm and 25mm torx is a must. PLus a 10mm driver, 5/8 flare wrench, rubber orings, gaskets. I removed and plated off my cold start, egr and air too.

https://www.thirdgen.org/forums/tpi/...inted-tpi.html

https://www.thirdgen.org/forums/tpi/...e-install.html

https://www.thirdgen.org/forums/tpi/...tock-fuel.html

https://www.thirdgen.org/forums/tpi/...elet-just.html

before I painted
https://www.thirdgen.org/forums/tpi/...m-removal.html

jjcuff1

As for parts:

Southbay injectors and had o rings I used dish soap to lubricate
Bought gasket kit
gasket dressing lube from autozone helps keeps them in place as you mount
I replaced fuel reg and gasket with autozone part
autozone assorted o ring set to replace the fuel line gaskets
hawks cold start block off kit and egr kit
I bought a rough sanding block for $3 from lowes helps scuff up and clean surfaces

finding the new PCV and vac lines was hard still had to rig it with expensive rubber bits from autozone. has to be a better way. i have mine hooked up but I will look for simpler approach

here it is all completed and repainted.

southbay08

great job!

jjcuff1

Hi Southbay! You guys were SOOOO supportive and helped me even on a saturday.
I highly recommend Southbay support and products for sure!

I did have one screwup during my install, I pinched off one of the rubber gaskets into the fuel rail and it was leaking bad. I was able to loosen the rail and slide the 1 injector out. I had a assorted o-ring kit from advance by my side so i matched up what looked like a 99% fit and slid it onto the injector.

So far so good held up no problem.

southbay08

Hey jjcuff1,
You're very welcome. Glad everything worked out well for you!

BOOT77

Was it a Viton o-ring in that kit?

timfitz63

Trying to locate a replacement hose that I've had someone suggest I be prepared to replace during this job. It's apparently different between the Camaro installation (shown above) and the Firebird, but the hose is just below the plenum intake on the driver's side. It's oddly U-shaped, probably pre-formed, with a fairly tight bend radius (precluding me from trying to take a straight hose and bend it to shape without kinking it). And while mine is probably OK, it is ~25 years old, and I'd kind-of like to have a new one on hand, just in case...

I'm told it's used to circulate warm coolant through the intake plenum; I'm guessing that's to prevent the equivalent of carburator icing in the intake...?

Anybody got a proper name/part no. for this hose on the 'Birds...?

jjcuff1

BOOT77. It was autozone assorted DORMAN rubber (buna) pack general auto grade. I know what your saying. Buna is ok for gas and will work in light applications. I had the fuel line on there with no orings and it didn't leak. 1 injector has the dorman kit.

Should be fine for while. I know the ethanol in the gas might break it down. but before then I will replace top end and/or motor.

I wonder what does southbay use on there injectors? I used what came with the injectors.

southbay08

we use Viton orings on our injectors

timfitz63

I need a part number and/or some purchasing guidance on this item as well. Apparently there are more than one of these available (with several GM part numbers) for the different engines, and I don't currently have any resource with which to cross-reference the part. I want to be certain I get the correct one for the 5.0L TPI engine (engine code 'F') with a manual transmission (apparently, there's a distinction there for the EGR valve...).

Still waiting on someone to point me toward that oddly-shaped hose that fits unter the plenum intake, too...

jjcuff1

Does TX have site inspections? You can probably remove it and just make sure you have a new cat to pass emissions, probably tune your car for a emission run.

timfitz63

There is an annual inspection here, and it generally includes emissions (depending on the area). This car has always passed.

Frankly, I'm just trying to collect all the correct parts I may need to do the fuel injector swap, and the EGR valve was suggested as preventative maintenance while things were apart. I'm not currently having a problem with vehicle emissions; and I generally subscribe to the notion that if it ain't broke, don't fix it... But even where a low-mileage 25+ year-old car is concerned, there's a case to be made for changing out some of these parts while one has the chance to do so with relative ease... On this car, I've seen more and more parts failing simply through age rather than use... And in my case, I'm trying to keep the vehicle as stock as possible.

jjcuff1

My car has low mileage and sat and although it ran and things checked out good I did release as I was in there and glad I did. Some parts were fine and worked like ICM dizzy since new ones made no difference or were broke from the store. Others worked but to be safe replaced and once inspected were so shot or soon to fail I adopted that on all parts I touch.

And the labor and gasket kit to get into that area it makes sense to replace. I removed mine since no inspections in FL. but the regulator as example worked no leaks and had 43 psi. once I removed it though it was so rusted or orange and stuck I do not see how and it took 2 clean outs of the fuel rail to make sure all was good. First time I heard bubbles in the rail and didnt seem right, removed and had debris from the bad regulator that fell off when I removed.

I would replace it. especially the vac lines even if they look 100% fine throw them out!

timfitz63

Wilco. Fuel pressure regulator diaphram is on order, but I still need to isolate the part number of the proper EGR valve for my 'F' code 5.0L TPI engine -- and that funny-shapped hose under the plenum intake... I plan to get new plenum gasket and o-ring sets as well, but want to pick up all the parts at once rathter than making multiple trips/online orders.

Tuned Performance

iTrader: (92)

Standard motor products egv394
Alternate/OEM Part Number(s): 17085815, 17085819, 17110786, 17110790, 17113406

timfitz63

Not necessarily disputing that information (and thank you, by the way); but it doesn't seem to jibe with other information I've found... In fact, it kind-of adds to the mystery, as it's yet another part number... Perhaps I should relay the specifics of my confusion...?

One merchant's web site implies the Standard Motor Products part may be EGV403, replacing alternate/OEM part number(s) 17087262, 17087263, 17110788, 17111922, 17111923, and 17113459; this is ostensibly presented on the web site as a general replacement for vehicles with the 5.0L TPI ('F' code) engine (i.e., there is a separate Standard Motor Products part, EGV632, listed for the 5.0L TBI ['E' code] engine). Standard Motor Products EGV394 isn't even listed under the apparent options for my engine...

The same merchant site also lists AC DELCO 2145538 (alternate OEM part number[s] 17113459, 19210684) for Firebirds with the 'F' code engine and "w/A/TRANS", which I take to mean "with an automatic transmission." In the very next part listing, it calls out AC DELCO 142268 (alternate OEM part number 19240974) for the 'F' code engines, which I interpret as implied for the 'F' code engine with a manual transmission (the site does not explicitly state any transmission pairing for this part).

At this point, I don't know if EGV394 is a general replacement EGR valve for GM 8-cylinder engines, a superseding/superseded part for the TPI engines, or whether mine needs to be a different part altogether due to the transmission pairing. Again, the primary goal is to maintain stock/originality, so generalized replacement parts are not as desirable as the correct, original part; direct-replacement aftermarket (i.e., non-AC DELCO) parts are acceptable as well, as long as they function exactly like the original part.

Tuned Performance

iTrader: (92)

I have 5-6 use 85-89 egr switch the temp sensor hole. If you want them just pay for a medium flate rate box and they are yours.

timfitz63

Thanks, I'll consider that. But as I mentioned in an eariler post, mine seems to be fine at the moment; if I can't find a proper, new-manufactured replacement, I'll probably just keep mine in place.

I'll PM you if I need the ones you've got.

timfitz63

*BUMP*

No one's got an answer for the hose (name/part number)...?

The proper EGR valve replacement is also still something of a mystery; not even the vendor to whom I spoke seems able to cross-reference the correct part number using my VIN...



I may just have to be careful during disassembly in order to re-use my existing parts...

Tuned Performance

iTrader: (92)

http://parts.nalleygmc.com/

timfitz63

Perfect! Thanks!

Hose in question appears to be listed as "Throttle Body Coolant Supply. CONNECTOR. HOSE."

Looks like only one EGR valve for the LB9 engine: "VALVE. Emission Control System." That's an expensive bugger...!

Tuned Performance

iTrader: (92)

http://www.ebay.com/itm/ACDelco-214-5538-EGR-Valve-With-Gasket-/321264709509?pt=Motors_Car_Truck_Parts_Accessories&hash=item4accde6f85&vxp=mtr

Tuned Performance

iTrader: (92)

timfitz63

Just thought I'd bring some closure to this thread and mention that I've finally gotten this job accomplished, and the 'Bird is running well again!

Thanks to all who provided parts information and tips!