C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Leaking fuel injector

Thread Tools
 
Search this Thread
 
Old May 1, 2007 | 01:53 PM
  #1  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default Leaking fuel injector

For the last month or so I've been noticing a small puddle on my intake manifold right below #6 cyl injector, I haven't been able to verify a leak in the injector but I don't know where else it could come from. Also every once in a while it cranks too long. So I guess it's time to take it apart, here's the question, should I buy new or reman injectors or just replace o-rings, i don't know if the injectors are original or not it's an 86 with 66,000 miles. It's a little work to get them out so I'm thinking replace them..what do you guys recommend. I have done minor mods re: 1.6 roller rockers/LT-4 springs MDS ign. also has new wires,cap, pick up mod, plugs, rebuilt t/b etc. Thanks in advance. Rich
Reply
Old May 1, 2007 | 02:33 PM
  #2  
rick lambert's Avatar
rick lambert
Le Mans Master
10 Year Member
 
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Default

Couple things I'd do first, a fuel pressure test and then ohm the injectors both hot and cold. If everything checks out good it might just be a seal, are you sure it's gas? If it does turn out to be injectors and it's not a daily driver I'd have them rebuilt.
Reply
Old May 1, 2007 | 04:46 PM
  #3  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default

Originally Posted by rick lambert
Couple things I'd do first, a fuel pressure test and then ohm the injectors both hot and cold. If everything checks out good it might just be a seal, are you sure it's gas? If it does turn out to be injectors and it's not a daily driver I'd have them rebuilt.
Thanks, I'll check pressure and ohms, I'm pretty sure it's fuel, It's definetly not coolant.
Reply
Old May 1, 2007 | 06:13 PM
  #4  
RRT vette's Avatar
RRT vette
Le Mans Master
15 Year Member
 
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Default

with Rick. That is the next logical step.
Reply
Old May 1, 2007 | 11:57 PM
  #5  
tdf's Avatar
tdf
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Oct 2006
Posts: 246
Likes: 1
From: Elk Plain WA
St. Jude Donor '11
Default Refreshing the Injectors

This guy did a nice job on a set of boshe injectors for my BMW. I can recommend his services.

http://www.witchhunter.com/

Let's say one or more of your injectors are bad. This is a good way to find out. If he can't get any one of them to flow correctly then at least you know which injectors to replace. In my case they all came back to me within spec and the car runs great.
Reply
Old May 2, 2007 | 12:08 AM
  #6  
CentralCoaster's Avatar
CentralCoaster
Team Owner
 
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Default

If it's leaking on the manifold you simply need new orings.

These come in the felpro TPI intake gasket kit.

Since you're going to all that trouble, it may be worth getting the injectors cleaned...

Many of us on here have sent our original injectors to Rich at Cruzinperformance.com

He'll flow test your injectors for about $100 and they'll come back cleaned internally and looking brand new.

If you can't afford to have the car down for a week doing this, then you can get a set of new Ford 22# injectors for about $240 from summit.com.
Reply
Old May 2, 2007 | 12:11 AM
  #7  
Sam Lam's Avatar
Sam Lam
Melting Slicks
20 Year Member
 
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Default

on the excellent injector service provided by Rich Jensen at Cruzinperformance.
Reply
Old May 2, 2007 | 07:52 AM
  #8  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default

Thanks for the help guys, I can't seem to find cruizinperformance.com. a site comes up with multiple choices for auto parts/repair. can you clarify address, also will a set of injectors out of an 89 fit in my 86L
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-1

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-2

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-3

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-4

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-5

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-6

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-7

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-8

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-9

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
Old May 2, 2007 | 08:15 AM
  #9  
Sam Lam's Avatar
Sam Lam
Melting Slicks
20 Year Member
 
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Default

Here is the email address for Rich Jensen at Cruzinperformance: rich@cruzinperformance.com. His phone number is: 231-796-5705.

The injectors used in Corvette years 89 - 91 are called GM Multecs and they have a high failure rate due to the turns of coil wire shorting out to each other (called shorting) If you call Rich, ask him about using a set of 89 injectors in your car

Have you removed the injectors in your Corvette prior to this issue?
Reply
Old May 2, 2007 | 09:53 AM
  #10  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default

Originally Posted by Sam Lam
Here is the email address for Rich Jensen at Cruzinperformance: rich@cruzinperformance.com. His phone number is: 231-796-5705.

The injectors used in Corvette years 89 - 91 are called GM Multecs and they have a high failure rate due to the turns of coil wire shorting out to each other (called shorting) If you call Rich, ask him about using a set of 89 injectors in your car

Have you removed the injectors in your Corvette prior to this issue?
Thanks Sam, No the injectors are still in, other then the leak I'm seeing the engine runs great, I had a chance to get some 89 injectors and then I could have sent them to Rich for cleaning and install them,save some downtime, but it's not my DD so I'll just pull my injectors and send them, thanks for good info on 89 inj
Reply
Old May 2, 2007 | 12:07 PM
  #11  
mikey whipreck's Avatar
mikey whipreck
Melting Slicks
15 Year Member
 
Joined: Jun 2004
Posts: 3,032
Likes: 4
Default

Originally Posted by rich653
Thanks for the help guys, I can't seem to find cruizinperformance.com. a site comes up with multiple choices for auto parts/repair. can you clarify address, also will a set of injectors out of an 89 fit in my 86L
That's because you have to spell it right: http://www.cruzinperformance.com/
Reply
Old May 2, 2007 | 12:45 PM
  #12  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default

Originally Posted by mikey whipreck
That's because you have to spell it right: http://www.cruzinperformance.com/
oops:o thanks
Reply
Old May 2, 2007 | 08:45 PM
  #13  
rich653's Avatar
rich653
Thread Starter
Burning Brakes
 
Joined: Aug 2006
Posts: 780
Likes: 0
From: New Port Richey Florida
Default

Originally Posted by rick lambert
Couple things I'd do first, a fuel pressure test and then ohm the injectors both hot and cold. If everything checks out good it might just be a seal, are you sure it's gas? If it does turn out to be injectors and it's not a daily driver I'd have them rebuilt.
You know the more I look at it and smell it it could be oil but I can't imagine how it could puddle in the manifold, there no sign of leakage anywhere, is it possible for oil to seep up through the manifold bolt ??
Reply
Old May 2, 2007 | 10:23 PM
  #14  
CentralCoaster's Avatar
CentralCoaster
Team Owner
 
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Default

Originally Posted by rich653
is it possible for oil to seep up through the manifold bolt ??
Yes, it's pretty common, happens on my car all the time. It's capillary action.

If you can't tell oil from gas I dunno what to say. Gas will leave a residue, but will evaporate quickly. Oil will just sit there and collect dirt.
Reply

Get notified of new replies

To Leaking fuel injector





All times are GMT -4. The time now is 08:25 PM.

story-0
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-1
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-2
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-3
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-4
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-5
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-6
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-7
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-8
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-9
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE