how fast pressure drop for leaking injectors?

Reply Subscribe

Thread Tools

Search this Thread

Oct 23, 2006 | 07:52 AM

Arlon

Thread Starter

Instructor

Joined: Jul 2006

Posts: 167

Likes: 0

From: Houston Tx

how fast pressure drop for leaking injectors?

Checked pressure and was fine but leaked down to 20 lbs in about 15 minutes? How fast will acceptable injectors leak down pressure?

Oct 23, 2006 | 08:33 AM

Wheelman

Le Mans Master

Joined: Jun 2001

Posts: 6,694

Likes: 3

From: Less Talk, More WOT | Houston TX

Well, does your car start / run ok? If so then I guess they are acceptable.

As far as how your fuel system SHOULD work, it should hold at around 40psi or so for about 30 minutes.

Oct 23, 2006 | 08:40 AM

AGENT 86

Team Owner

Joined: Jan 2003

Posts: 20,333

Likes: 263

From: Summerland B.C. Canada

You have to rule out the other areas of pressure loss before you can call it an injector leakdown problem. Could be the check valve in pump, dampner above fuel pump or fuel reg also.
My pressure loss was at the dampner. I removed it and replaced it with 2 clamps and a piece of hose.
http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf

Oct 23, 2006 | 08:49 AM

Bob CTS

Race Director

Joined: Jun 2005

Posts: 17,640

Likes: 1

From: Lenoir City TN

St. Jude Donor '08-'09-'10-'11

Follow the procedure to rull out other components.

Oct 23, 2006 | 09:05 AM

redrose

Melting Slicks

Joined: Feb 2006

Posts: 2,753

Likes: 15

From: backwoods upstate ny

like agent86 sez.

should hold 10 psi after 24 hours to run ok (my experiences) ...some hold much better

Oct 23, 2006 | 09:27 AM

Arlon

Thread Starter

Instructor

Joined: Jul 2006

Posts: 167

Likes: 0

From: Houston Tx

Quote:

Originally Posted by Wheelman

Well, does your car start / run ok? If so then I guess they are acceptable.

As far as how your fuel system SHOULD work, it should hold at around 40psi or so for about 30 minutes.

Starts fine but runs fair. It seems to have a fairly dead #2 cyl. Has spark but the plug in that hole was wet and much crudier than the other 7. I am assuming a leaking injector in that hole. Definately will not hold 10lbs for 24hrs. More like an hr. at best.. Just got some ford injectors from ebay I think I'll try and see how they do... agent86, thanks for the manual link.. Arlon

Last edited by Arlon; Oct 23, 2006 at 09:53 AM.

Oct 23, 2006 | 09:58 AM

USAsOnlyWay

Le Mans Master

Joined: Dec 2002

Posts: 5,270

Likes: 3

From: Seattle Area WA

I have a bad check valve in the pump, made me crap myself the first time I did the pressure check. But the car runs great.

Oct 23, 2006 | 10:18 AM

94ZR1

Le Mans Master

Joined: Aug 2005

Posts: 5,002

Likes: 5

From: No Opti Here Tn

St. Jude Donor '06

Too fast but as others said rule out other things first

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Joe Kucinski

Every 2027 Corvette Engine Explained

Joe Kucinski

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Verdad Gallardo

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Oct 23, 2006 | 10:30 AM

wro87

Burning Brakes

Joined: May 2006

Posts: 857

Likes: 1

From: Morrisonville Illinios

If you have the FM has lots of info check it out so you can see about pinching off the return line for leakage. But it sounds like you may have spotted the bad injector if the plug is real wet. Check your oil for contamination from excess fuel. You may want to change it.
wro87