Replaced fuel filter. Replaced fuel pump. Psi reads at 60. Replaced the ignition and wiring harness. Have spark. Checked all of the fuel lines. Put the tester to it and get back no codes. It is getting fuel and it is getting spark. When I put fuel in directly it fires up no problem, but won't run it just dies and it won't start from inside the cab. What else could it be? How do I test the fuel pressure regulator and does anybody know how to conduct the fuel ignition coil test? Is there any other tests I haven't covered yet? Detailed solutions and I will be eternally grateful.

 

You say you're getting fuel and spark. Is this a 4 or 6 cyl? Throttle body or Port fuel injectors?
You have spark because it fires when you put fuel directly into .... where?
If it's TBI and you have a timing light, you can hook up your timing light and point it down the throttle body to see the spray from the injector. A noid light is a good ( inexpensive) tool that connects to the fuel injector connector...it will flash with the engine cranking if there is a signal to the injector. There are noid lights for different styles of injectors ( T/B or Port)
You can also check for a signal to the injector with an LED test light.
Hope this gets you started.
Let us know what engine and fuel delivery sytem you have...it would be helpful.

 

CMFI central multi port fuel injection

 

[sm=chairshot.gif] Does anyone have experience in repairing the injector ignition feed circuit? I am running out of possible solutions here. The only other thing I think it could be is the FPR.[sm=headbang.gif]

 

Okay try this!

Document ID# 1370916
1995 Chevrolet/Geo S10 Pickup - 4WD


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Fuel Injector Coil Test




Test Description
The numbers below refer to the step numbers on the diagnostic able.

This step is the setup step for performing the injector coil test. Also read the instructions included with the tools used for this test.

Engine coolant temperature affects the tool's ability to detect a faulty injector. If the engine coolant temperature is not between 50° F and 95° F, allow the vehicle to warm or cool as necessary.

Due to a current surge, the first second of the voltage reading may be inaccurate; therefore, begin recording after the first second of the voltage reading. The voltage specification should be within range. The voltage reading may increase throughout the test as the injector windings warm up and the resistance changes. An erratic voltage reading (one that jumps up and down) would indicate an intermittent connection within the fuel injector.

Step
Action
Value(s)
Yes
No

1
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
Turn OFF the engine.
Relieve the fuel pressure. Refer to Fuel System Diagnosis .
Connect the fuel injector tester J 39021 to B+.
Connect the injector switch box J 39021-210 .
Set the amperage supply selection to the 0.5 amp position.
Connect the leads from J 39200 digital volt meter (DVM to the tenths scale (0.0).
Connect the scan tool.
Monitor the engine coolant temperature.
Is the engine coolant temperature within the specified value?
10°-35° C
Go to Step 4
Go to Step 3

3
Allow the engine to warm or cool as necessary.

Is the engine coolant temperature within the specified value?
10°-35° C
Go to Step 4
--

4

Important
Perform the following test for each injector.


Press the Push To Start Test button.
Monitor the DVM.

Important
Voltage may climb during the test. Watch for erratic readings (voltage that jumps up and down).


Do any of the injector voltage readings fall outside the specified value?
5.44-7.53 V
Go to Step 5
Go to Fuel Injector Balance Test

5
Replace the fuel injector and poppet nozzle assembly that was not within the specified value. Refer to Fuel Injector Replacement .

Is the action complete?
5.44-7.53 V
Go to Step 6
--

6
Using the scan tool, select the DTC and the Clear Info.
Attempt to start the engine.
Does the engine start and continue to run?
--
Go to Step 7
Go to Step 2

7
Allow the engine to idle until reaching the normal operating temperature.
Select the DTC and the Failed This Ign.
Are any DTCs displayed?
--
Go to The Applicable DTC Table
Go to Step 8

8
Using the scan tool, select the Capture Info and the Review Info.

Are any DTCs displayed that have not been diagnosed?
--
Go to The Applicable DTC Table
System OK



--------------------------------------------------------------------------------
Document ID# 1370916
1995 Chevrolet/Geo S10 Pickup - 4WD


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I am having the same problem with 99 4.3 engine,mechanics found a burnt wire on the ign switch,but I think they are still having problems with it running,I'm watching this to see how you fair.

 

[sm=dontgetit.gif] Got it all back together and now am getting codes P0222 and P0234. What now!?[sm=icon_beat.gif] Forgot to mention in my first post that the ignition switch and wiring harness were already thought of and replaced.

 

It is a CPI. And put it all back together again after replacing FPR and it's[sm=grinangel.gif] throwing codes 22 and 34. Thanks for your input.[sm=chattypair.gif]

 

Code 22 is an EGR code...Check vacuum hoses, check egr operation. egr solenoid for power. Power to egr solenoid is from ign switch.
I believe that code 34 mean the engine is running lean (or rich). forgive me I'm working with a failing memory as I don't have a manual.
Check the egr valve operation...it could be the cause of both codes
Sorry I can't be more helpful.

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