No Injector Pulse, 89 Wrangler 2.5 4 cylinder - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-09-2009, 04:39 PM   #1
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
No Injector Pulse, 89 Wrangler 2.5 4 cylinder

Does anybody have an idea where I can look next? I tested the injector and have 1.5 ohms, it has fire, fuel pump is working with what seems to be plenty of pressure bto the back of the throttle body, fuel filter is new and in the right flow direction. Is there a relay or fuse for the fuel injection? It does run when I dump fuel in the throttle body. I changed the crank trigger, ignition module and computer. Thanks in advance, John

friendx4 is offline   Quote Quick Reply
Old 11-09-2009, 09:12 PM   #2
Jeeper
 
Join Date: Sep 2009
Posts: 21
Here is some info. Disconnect the injector wire connector from the injector.
Place an ohmmeter on the injector terminals.
Resistance reading should be approximately 1.2 Ohms .
General Information
The DRB II and Jeep/Eagle adapter can be used to determine certain fault codes in the injector circuit. To read fault codes "SYSTEM TESTS" must be selected from the main menu. The DRB II screens will provide instructions to prompt the technician through a series of functional tests. Any fault codes will be displayed on the DRB II screen.

Fault code number 1012 indicates the fuel injector crcuits require testing. Possible problems include an open in the injector voltage supply wire from the fuel pump relay, an open in the injector control wire, the injector control wire shorted to ground, a faulty fuel injector or ECU.

cwbymt1973 is offline   Quote Quick Reply
Old 11-09-2009, 09:13 PM   #3
Jeeper
 
Join Date: Sep 2009
Posts: 21
Your Vehicle: 1989 Jeep Truck Wrangler L4-150 2.5L VIN E TBI


Vehicle » Powertrain Management » Fuel Delivery and Air Induction » Fuel Pump Relay » Testing and Inspection Notes



Testing and Inspection




Relay Terminal Identification

FUEL PUMP RELAY TERMINAL IDENTIFICATION
The following is a list of the terminal numbers, with circuit codes, and color codes, and their function:



Circuit No. Terminal No. Color Code Description
10 30 Red Has battery input voltage supplied through fusible link.
F22 87 Orange Connected to 10 circuit (terminal 30) in the energized position, supplies output voltage to fuel pump, EGR/EVAP solenoid, and fuel injectors.
F17 86 Orange Connected to the Electronic Control Unit (ECU), which provides input voltage to the relay.
11 85 Yellow Connected to the ECU, and grounded by the ECU when distributor signal is present.
N/A 87A N/A Not used in these applications.

FUEL PUMP RELAY TEST

NOTE: The Fuel Pump relay operation may be tested with the use of the DRB II scanner or equivalent. Refer to COMPUTERIZED ENGINE CONTROLS/DIAGNOSIS AND TESTING for procedure. If no scanner is available proceed with the following test.



Connect a voltmeter to the 10 (terminal 30) wire at the fuel pump relay connector. Check for battery voltage. If no voltage is present, check fusible links and supply voltage from the battery. If voltage is present proceed to step 2.
Connect the voltmeter to the F22 (terminal 87) wire at the fuel pump relay connector. Turn the ignition key to the START position and crank the engine. If output voltage is present during cranking, the fuel pump relay is functioning normally and no further testing of the fuel pump relay is necessary. If no voltage is present at the F22 wire, proceed to step 3.
Connect the voltmeter to the F17 (terminal 86) wire at the fuel pump relay connector. Turn the ignition key to the RUN position. Input voltage from the ECU to the fuel pump relay should be present. If voltage is present proceed to step 4. If no voltage is present, disconnect the 35 way ECU and 6 way diagnostic connectors, and the fuel pump relay connector. Connect an ohmmeter between the F17 (terminal 86) wire and the orange wire at pin connector no. 6 of the ECU, and check for continuity. If continuity exists, refer to COMPUTERIZED ENGINE CONTROLS/DIAGNOSIS AND TESTING for ECU testing procedures. If no continuity exists, repair open in wire, reconnect ECU and fuel pump relay, and test operation.
Connect voltmeter to 11 (terminal 85) wire at fuel pump relay connector. Turn ignition key to START position, and crank engine, while observing voltage at 11. Voltage should be present at 11 and drop to less than 1 volt within 2 seconds during cranking. If voltage drops fuel pump relay is functioning, and no further testing of the fuel pump relay is necessary. If voltage does not drop, proceed to step 5. If no voltage is present, disconnect the fuel pump relay, and connect an ohmmeter between the F17 (terminal 86) and 11 (terminal 85) of the fuel pump relay and check for continuity. If no continuity exists replace the fuel pump relay and test operation.
Disconnect the 35 way ECU, and 6 way diagnostic connectors and fuel pump relay. Connect an ohmmeter between the 11 wire at the fuel pump relay connector and the yellow wire at pin connector no. 3 of the ECU. Check for continuity. If no continuity exists repair open in wire, reconnect ECU and fuel pump relay, and test operation. If continuity exists, refer to COMPUTERIZED ENGINE CONTROLS/DIAGNOSIS AND TESTING , for ECU testing procedures.
cwbymt1973 is offline   Quote Quick Reply
Old 11-10-2009, 06:05 AM   #4
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
I retested the injector and have 1.3 ohms. I changed the ECU with a good one from a running donar vehicle. The fuel pump kicks on every time you cycle the ignition (key) on, I loosened the fuel line on the back of the throttle body and when I turn the engine over I have plenty of fuel squirting out.
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 07:18 AM   #5
Jeeper
 
Join Date: Aug 2009
Location: Trainer, PA
Posts: 40
Send a message via AIM to 19yj89
we had a very similar problem! Hubby talked to a friend of ours who knows the 2.5 in and out and he said either map sensor or ecu. After replacing many parts it wound up being the ecu like he said. Do you have a map sensor you can try? Ours is also the 89 2.5 fuel injected...
19yj89 is offline   Quote Quick Reply
Old 11-10-2009, 10:26 AM   #6
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
I just replaced three relay's rather than testing each one. Two near the battery and one under the driver side dash on front left. I don't have a map sensor but I'm sure one of the auto part chains will. Thanks, John
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 03:26 PM   #7
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
Alright to all who are interested, I now have changed the map sensor and it still has no injector pulse. Have I missed changing something that would control injector pulse? And no, I don't like spending money on parts that don't need to be changed, I just figured 10 for a relay (x3), 20 for trigger, 40 for a sensor, what could it hurt as long as it worked.
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 03:37 PM   #8
after birthday glow
 
morphious's Avatar
 
Join Date: Jul 2009
Location: wisconsin
Posts: 1,963
Images: 1
did any one mention the possibility of ignition control module yet, if not might be something to look into. next so u have no pulse can u trace the wires back and see if theirs a connector that may be loose or corroded. and also check the wire to see if theirs voltage farther down the line.
__________________
some say why i say
its a jeep thing u wouldn't understand
morphious is offline   Quote Quick Reply
Old 11-10-2009, 04:00 PM   #9
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
Just so everyone knows that the Jeep was running when parked one month ago, I went out to start it and the start of this thread explains my problem and what I've done so far, but just to clarify I've changed the: crank trigger, map sensor, ignition control module, ECU, both relay's by the battery, one relay in cab on drivers side, there is good fuel pressure to the throttle body and the injector resistence is approximately 1.3 ohms. It has to be something simple, but I'm so fustrated that I'm about ready to change the distrbutor and throttle body to a carb.
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 04:04 PM   #10
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
By the way I have a SOA set of axles with longer shocks, extended brake lines out of a 89 YJ.
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 04:05 PM   #11
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
Megan Fox? Your on your own ther pal....
friendx4 is offline   Quote Quick Reply
Old 11-10-2009, 04:21 PM   #12
Jeeper
 
Join Date: Aug 2009
Location: Trainer, PA
Posts: 40
Send a message via AIM to 19yj89
Have you tried replacing the injector itself? They are a little pricy new 125 rebuilt around 65 and junkyard (the route we took) 15. Had to go to 4 different yards before we finally found one in a 4.3 liter jimmy.
19yj89 is offline   Quote Quick Reply
Old 11-10-2009, 04:29 PM   #13
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
No, I haven't replaced the injector yet. But, what the heck, it's just one more part, right?
friendx4 is offline   Quote Quick Reply
Old 11-16-2009, 03:38 PM   #14
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
For all who are interested, it was an injector problem. It tested good (ohms/voltage) but wouldn't pulse fuel, not a drop. It must have gotten stuck or something. Got a used injector from a local yard out of an 88 chevy impala brouham with two injectors in a throttle body on top of a 4.3L, runs better than ever!! THANKS FOR ALL THE INPUT.
friendx4 is offline   Quote Quick Reply
Old 11-17-2009, 08:26 AM   #15
Jeeper
 
Join Date: Aug 2009
Location: Trainer, PA
Posts: 40
Send a message via AIM to 19yj89
glad you finally got it back on the road!
19yj89 is offline   Quote Quick Reply
Old 11-17-2009, 10:52 PM   #16
Newb
 
Join Date: Nov 2009
Posts: 9
Is there any way to clean injectors
jeepjo is offline   Quote Quick Reply
Old 11-17-2009, 10:55 PM   #17
Newb
 
Join Date: Nov 2009
Posts: 9
injectors

can you clean fuel injectors
jeepjo is offline   Quote Quick Reply
Old 11-17-2009, 11:03 PM   #18
Jeeper
 
YjMopower's Avatar
 
Join Date: Oct 2008
Location: Bronx
Posts: 414
Send a message via AIM to YjMopower
fuel injector cleaner sTP but it isnt going to always work if the injector is really worn out.
__________________
1992 Jeep Wrangler ARMY STRONG
YjMopower is offline   Quote Quick Reply
Old 11-18-2009, 04:59 PM   #19
Jeeper
 
Join Date: Nov 2009
Location: Jersey
Posts: 21
Or if it is not pulsing at all, how would cleaner get past the nozzle? Just get a used one from a local yard for 5.00 instead of 125.00 from autozone.
friendx4 is offline   Quote Quick Reply
Old 11-18-2009, 06:21 PM   #20
Jeeper
 
Join Date: Aug 2009
Location: Trainer, PA
Posts: 40
Send a message via AIM to 19yj89
you can have them cleaned...either meinekee or midas does it. But if the injector is too far gone you're gonna have to replace it.
19yj89 is offline   Quote Quick Reply
Old 12-17-2009, 01:53 PM   #21
Newb
 
90YJGuy's Avatar
 
Join Date: Dec 2009
Posts: 5
I am having a very similar problem. My 90 2.5L will run on starting fluid but will not fire on it's own. There is a steady stream of fuel to the throttle body and the spark is strong. I too replaced my injector and it DID NOT solve my problem. I am thinking it could be the ECU or wiring from the ECU to the injector. Anyone got any ideas??

90YJGuy is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
jeep wrangler 4 cylinder gas mileage dm567@pacbell.net YJ Tech Forum 19 02-09-2012 07:13 AM
1994 Wrangler Clutch master cylinder bore size Selafane YJ Tech Forum 1 11-10-2009 04:34 PM
Bleeding External Slave Cylinder '95 wrangler dwagler YJ General Discussion Forum 1 09-10-2009 11:40 AM
2002 Jeep Wrangler 6 cylinder Wolfgang TJ General Discussion Forum 7 02-11-2009 11:07 AM
92 Wrangler Slave Cylinder Misery - HELP!!! wyoming92 YJ Tech Forum 3 08-21-2007 07:28 PM



» Featured Product

All times are GMT -5. The time now is 08:48 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC