Pulling the plemun...

[Toyvet1]

Im thinking of pulling the plemun soon. Thinking of replacing the injectors and troubleshooting a vacuum leak.

So the question is where is the best source for injectors, gaskets and anything else I will need. What should I have on hand?

The vacuum pump runs all the time. I apply vacuum to engine side of tubing and apply 14" and pump still runs.

Any help would be apprceated....

[tccrab]

Im thinking of pulling the plemun soon. Thinking of replacing the injectors and troubleshooting a vacuum leak.

So the question is where is the best source for injectors, gaskets and anything else I will need. What should I have on hand?

The vacuum pump runs all the time. I apply vacuum to engine side of tubing and apply 14" and pump still runs.

Any help would be apprceated....

Jerry (A26B) will hook you up with gaskets:
http://www.zr1netregistry.com/forum/showthread.php?t=5383
There are options on which injectors to use, a lot will depend on how much you want to spend.
Current choices are:
Original Delphi Multec. $$$$
RC Engineering $$$$
Accell $$
I've read about refurbed Bosch injectors, but so far only one guy has them installed. No data to work with yet.
There's lots of info here, just do a search on "Injectors".

JeffVette might be able to help you out with some of the parts you might need for the secondaries vacuum stuff ($$),
http://www.pnwzr1.com/
Otherwise Kurt White will have what you need. ($$$$$$++)
www.whiteracingproducts.com

JeffVette has the *Very Best* "How To" writeup on removing the plenum (with pics) here at the Pacific Northwest ZR1 site:
http://www.pnwzr1.net/LT5_tear_down.htm
http://www.pnwzr1.net/LT5_tear_down2.htm

Good luck and let us know how we can help.

Tom

[ZR1Vette]

I would talk to JeffVette...extremely knowledgeable concerning the ZR-1 and LT5 and he offers very competive pricing for all the parts you need. Also, he was patient with my questioning..quite sure he has heard the same questions over and over, but he was willing to humor me with his knowledge and I appreciated that!

Concerning injectors... if your gasoline has ethanol in it (such as here in Northern Virginia... 10%) then do not use the OEM Delphi Multec... not ethanol friendly.

[tomtom72]

The vacuum pump runs all the time. I apply vacuum to engine side of tubing and apply 14" and pump still runs.

Any help would be apprceated....

TV1, just a fwiw. Over at CorvetteActionCenter.com in the C4/ZR-1 section is a great write up on how the system works and also some very useful trouble shooting steps.

When you applied vac to the plenum side of the hose did it hold? Did it drop & how fast? Has this situation set any codes?

Oh, Jeffvette also has accel injectors ready to drop in.

:cheers:
Tom

[Aurora40]

Concerning injectors... if your gasoline has ethanol in it (such as here in Northern Virginia... 10%) then do not use the OEM Delphi Multec... not ethanol friendly.
Just FYI, but that's not true. Both the '90-92 replacements and '93-'95 replacements from Delphi are rated to E10, the same as any gasoline injector on the market. You aren't buying some injector they made in 1991 and stored on a shelf since then.

[-=Jeff=-]

Jerry (A26B) will hook you up with gaskets:
http://www.zr1netregistry.com/forum/showthread.php?t=5383
There are options on which injectors to use, a lot will depend on how much you want to spend.
Current choices are:
Original Delphi Multec. $$$$
RC Engineering $$$$
Accell $$
I've read about refurbed Bosch injectors, but so far only one guy has them installed. No data to work with yet.
There's lots of info here, just do a search on "Injectors".

JeffVette might be able to help you out with some of the parts you might need for the secondaries vacuum stuff ($$),
http://www.pnwzr1.com/
Otherwise Kurt White will have what you need. ($$$$$$++)
www.whiteracingproducts.com (http://www.whiteracingproducts.com)

JeffVette has the *Very Best* "How To" writeup on removing the plenum (with pics) here at the Pacific Northwest ZR1 site:
http://www.pnwzr1.net/LT5_tear_down.htm
http://www.pnwzr1.net/LT5_tear_down2.htm

Good luck and let us know how we can help.

Tom

I agree with the above, but sent oyu an email as well.. Let me knwo if you need help. I will find time to stop by to do that..

TC, I am the guy with the bosch Rebuilts... Depending how things go, I am probably a week away from Firing the beast up

[A26B]

Latest gasket & seals listing:

http://www.zr1netregistry.com/forum/showthread.php?p=36521#post36521

Jerry

[GrayZ]

Jeffvette is an expert at pulling things.

[ZR1Vette]

Just FYI, but that's not true. Both the '90-92 replacements and '93-'95 replacements from Delphi are rated to E10, the same as any gasoline injector on the market. You aren't buying some injector they made in 1991 and stored on a shelf since then.

I guess my bad...listening to experts who have given me wrong info..guess I need to stop posting tech info :redface:
Michael

[Jeffvette]

You aren't buying some injector they made in 1991 and stored on a shelf since then.

Bob, don't be so sure. I've ordered some parts that have shown up with the old ac delco label.

For the amount of money they want for stock injectors, I will not use them in my car, or use them in a customers car, unless they are adament they must have stock.

[Aurora40]

Bob, don't be so sure. I've ordered some parts that have shown up with the old ac delco label.

For the amount of money they want for stock injectors, I will not use them in my car, or use them in a customers car, unless they are adament they must have stock.
The name "Delphi" within GM didn't exist until about 1995, and they weren't spun off until 1999. So I don't think you'll find any Delphi boxed injectors from 1991. :) Though with AC parts, yeah you never know. It probably depends on who you buy them from. Delphi injectors were no more expensive than RC's when I bought mine. However, I could get them right away vs waiting for RC's.

[Aurora40]

I guess my bad...listening to experts who have given me wrong info..guess I need to stop posting tech info :redface:
Michael
Don't worry about it, that's why the forum has the "reply" feature. No one always has all the right info. Doesn't mean you should stop posting tech info.

Here's the data on the '90-92 injectors.

http://go.delphi.com/CS/dpss/catalog/ProductInformation.aspx?PartProductID=FJ10004&PartNumber=FJ10004

http://go.delphi.com/CS/dpss/catalog/ProductInformation.aspx?PartProductID=FJ10005&PartNumber=FJ10005

[Norsky4360]

I bought Accel injectors from Summit Racing a year ago and then went on a 5,000 mile road trip. "The Beast" runs like a top IMO.