Bad fuel injector - Need Replacement Suggestions?
Thread Starter
Racer
Joined: May 2005
Posts: 277
Likes: 39
From: Billings, Montana but forever from Nebraska
Bad fuel injector - Need Replacement Suggestions?
I have recently found one of my injectors is bad and the others may not be far from it. Thus, I figured I should replace the whole set. What Brand is suggested? Should I stay close to or at stock injectors? Anything else to do while tearing it apart? I was thinking of an adjustable fuel pressure regulator.
The vette is an 89 coupe, manual, stock except for cat back and k&n Filter, however I do autocross and track day it.
Recent findings on vette:
Fuel injector ohms reading:
(All the readings are from front to back)
Driver side: 13.7, 16.0, 16.1, 13.2.
Passenger side: 16.4, 13.6, 13.8, 3.8
Bad injector @ 3.8 !
[U][B]Fuel pressure gauge readings:
Key on & not started: 43lbs
Run at idle: 38-39lbs
Run at idle & pull vacuum line off fuel pressure regulator: 46lbs
Running & rpm held steady at 2,000 & then 3,000rpm: 38lbs
Running & rev engine: jumps up 8lbs or so.
Wide open throttle: not tested yet.
Leak down from key on (prior to starting):
1st test:
0 min - 43lbs
3 min - 38.5lbs
5 min - 37lbs
8 min - 36lbs
10 min - 35lbs
15 min - 34lbs
2nd test:
0 min - 43lbs
3 min - 42lbs
5 min - 40.5lbs
8 min - 39lbs
10 min - 38.5lbs
15 min - 37lbs
The vette is an 89 coupe, manual, stock except for cat back and k&n Filter, however I do autocross and track day it.
Recent findings on vette:
Fuel injector ohms reading:
(All the readings are from front to back)
Driver side: 13.7, 16.0, 16.1, 13.2.
Passenger side: 16.4, 13.6, 13.8, 3.8
Bad injector @ 3.8 !
[U][B]Fuel pressure gauge readings:
Key on & not started: 43lbs
Run at idle: 38-39lbs
Run at idle & pull vacuum line off fuel pressure regulator: 46lbs
Running & rpm held steady at 2,000 & then 3,000rpm: 38lbs
Running & rev engine: jumps up 8lbs or so.
Wide open throttle: not tested yet.
Leak down from key on (prior to starting):
1st test:
0 min - 43lbs
3 min - 38.5lbs
5 min - 37lbs
8 min - 36lbs
10 min - 35lbs
15 min - 34lbs
2nd test:
0 min - 43lbs
3 min - 42lbs
5 min - 40.5lbs
8 min - 39lbs
10 min - 38.5lbs
15 min - 37lbs
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
The Fuel Injector Connection has a great reputation here on the Forum. Great prices and excellent service.
This would be a good time to replace the old O rings in your fuel rail too.
http://fuelinjectorconnection.com/sh...hp?groupid=101
This would be a good time to replace the old O rings in your fuel rail too.
http://fuelinjectorconnection.com/sh...hp?groupid=101
Melting Slicks
Joined: Jan 2008
Posts: 2,620
Likes: 81
From: Florence SC
St. Jude Donor '12
The Fuel Injector Connection has a great reputation here on the Forum. Great prices and excellent service.
This would be a good time to replace the old O rings in your fuel rail too.
http://fuelinjectorconnection.com/sh...hp?groupid=101
This would be a good time to replace the old O rings in your fuel rail too.
http://fuelinjectorconnection.com/sh...hp?groupid=101
X3! Great company and Great product!Jim
Melting Slicks
Joined: Jan 2001
Posts: 2,996
Likes: 304
From: MOORESVILLE NC
Cornhusker, Everyone is right. fuelinjectorconnection.com are the folks to deal with. You can get the complete kit that includes O-rings and fuel pressure reg. gaskets. The Bosh injectors are easier to install than stock. No c-clips.
What else to replace. EGR and all the vacuum hoses that run under the plenum.
What else to replace. EGR and all the vacuum hoses that run under the plenum.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I bought my injectors from FIC a couple of years ago and they came with the O-rings. I see on their site that they are now listing the O-rings separately, so it looks like you have to specifically order them, as they don't seem to be included any more.
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
One more for FIC.
I bought a set and found one injector that was stuck open. Even though it was unclear whether I may have gotten some dirt into it during the swap and caused the problem, FIC replaced it no questions asked.
Great company to work with.
I bought a set and found one injector that was stuck open. Even though it was unclear whether I may have gotten some dirt into it during the swap and caused the problem, FIC replaced it no questions asked.
Great company to work with.
Safety Car
Joined: Jan 2004
Posts: 3,759
Likes: 8
I went with the 22# FIC Bosch III injectors. And it ran super lean when datalogging. Found some recommending the 24# instead. And put in the 24# FIC Bosch III injectors and the BLM's were right in spec according to the FSM.
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