Performance & Maintenance Engine, forced induction, intakes, exhausts, torque converters, transmissions, etc.

Fuel injector mystery

Thread Tools
 
Search this Thread
 
Old 09-09-23, 08:38 PM
  #1  
sc3hundo
Rookie
Thread Starter
 
sc3hundo's Avatar
 
Join Date: Mar 2021
Location: WA
Posts: 30
Received 10 Likes on 6 Posts
Default Fuel injector mystery

I've run out of ideas so I'm posting my question here.
My car has been misfiring or running on 5 cylinders and I believe it is an injector issue. I began pulling one injector plug at a time and listening for a change in rpm, and when I pulled #2, the engine didn't change tone at all.
Here's what I've done:
-Pulled all injectors and had them cleaned and flow benched. All check out good.
-Double checked impedance of the injector. I'm getting 14.7Ohms. Good
-While car is idling rough, I tested the voltage at the pigtail connector going into the injector and I'm getting 8-9 volts. This is also present when the ignition is on but the car isn't starting. FYI this number was constant across all injectors
-Changed out sparks
-Tested for spark
-Pulled #2 spark plug. Plug was dry and didn't smell like gas.

I'm out of ideas. It could be a clog in the fuel rail but I'm doubtful since it'd be a large blockage and my fuel system was performing very well up until this point.
I'll take any advice, thanks in advance
Old 09-12-23, 01:53 PM
  #2  
sc3hundo
Rookie
Thread Starter
 
sc3hundo's Avatar
 
Join Date: Mar 2021
Location: WA
Posts: 30
Received 10 Likes on 6 Posts
Default

Bump. Still stuck, still will take any help
Old 09-12-23, 02:20 PM
  #3  
LeX2K
Lexus Champion
 
LeX2K's Avatar
 
Join Date: Sep 2010
Location: Alberta
Posts: 19,929
Received 2,846 Likes on 2,405 Posts
Default

You need a diagnosis tool capable of graphing injector pulse otherwise you're guessing. Have you tried swapping injectors around? Put another way did you install the injectors at random?
Old 09-12-23, 08:54 PM
  #4  
Tallyhoe
Advanced
 
Tallyhoe's Avatar
 
Join Date: Feb 2020
Location: CA
Posts: 584
Received 138 Likes on 108 Posts
Default

swap the coil and spark with an odd cylinder, see if it changes. I'd inspect the ignitor or ignitors, not sure if it has 1 or 2.

Lastly would consider timing or damaged valves on that cylinder. You may have lost compression in cylinder 2, since the valves may be slightly open.
The following users liked this post:
Klapped96 (09-13-23)
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Justice10
RX - 2nd Gen (2004-2009)
8
07-31-23 02:47 PM
scpoehl
LS - 1st and 2nd Gen (1990-2000)
3
06-23-23 07:11 PM
97trophy
IS - 1st Gen (2001-2005)
1
01-30-21 04:06 AM
mvanloo
IS - 2nd Gen (2006-2013)
1
06-18-18 11:21 AM
Ideal1267
ES - 1st to 4th Gen (1990-2006)
1
12-24-05 01:24 PM



Quick Reply: Fuel injector mystery



All times are GMT -7. The time now is 09:26 AM.