Injector life span and testing
Thread Starter
Pro
Joined: Mar 2003
Posts: 629
Likes: 20
From: Texas
Injector life span and testing
I have a '90 and I was wondering what is the life expectancy of the injectors?
What are some ways to test them?
I meaured the resistance on them and in general I found 16 ohms. But I have three cylinders that are not firing and the resistance of the injectors are 5,10,16. I think the injectors with 5 and 10 ohms are clearly bad, and perhaps the one with a normal reading of 16 is clogged.
I have checked everything on this engine and the only unknown is the injectors.
It looks like it is a major job to replace an injector. From what I can tell, it seems necessary to remove the top half of the intake?
Thanks,:flag
I'm sure this has been covered many times, but the search function on this forum does not work worth beans. :sad:
[Modified by split63, 11:01 AM 2/1/2004]
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Injector life span and testing (split63)
Yep, the two with the low readings are bad and, yes, you do have to pull everything down to the intake to get them out.
You can check the others injectors for leaks too by connecting the fuel lines to the fuel rails with the injectors OUT of the intake but still connected to the fuel rails.
Energize the fuel pump and check the tips of the injectors for any sign of leakage.
Jake
You can check the others injectors for leaks too by connecting the fuel lines to the fuel rails with the injectors OUT of the intake but still connected to the fuel rails.
Energize the fuel pump and check the tips of the injectors for any sign of leakage.
Jake
Instructor
Joined: Aug 2002
Posts: 198
Likes: 0
From: Yucaipa CA
Re: Injector life span and testing (split63)
I just replaced by '90 L98 injectors. The car had 146,000 on the originalinjectors. Big improvement.
You can replace your injectors by removing the plenum and leaving the runners in place. You'll have to remove your EGR valve and partially disassemble your fuel rail assembly by detaching the tubes from the left rail to allow you to pull the rail halves out. Be sure to replace the "O" rings on the tubes when reassembling your rail.
You can replace your injectors by removing the plenum and leaving the runners in place. You'll have to remove your EGR valve and partially disassemble your fuel rail assembly by detaching the tubes from the left rail to allow you to pull the rail halves out. Be sure to replace the "O" rings on the tubes when reassembling your rail.
Bench Racer
Joined: Feb 2003
Posts: 4,201
Likes: 15
From: Palm Beach Gardens FL
St. Jude '03 thru 14,'25
Re: Injector life span and testing (split63)
Someone in another thread just posted a link to a $99 set of new Bosch/GM injectors:
http://www.slponline.com/view_produc...RTNUMBER=23051
http://www.slponline.com/view_produc...RTNUMBER=23051
