Stalling while driving (especially after red lights)

Hi,

Since the codes indicate lean or low voltage from the sensors, have you checked to make sure the fuel pressure is within the manufacturer's specs?

If that hasn't been checked, that is where I would start. Here is a link that shows in general how it is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions and specs specific to your vehicle. The attached pics correlate with the directions. Additionally, it provides diagnostics for different situations.

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2006 Mitsubishi Eclipse L4-2.4L (4G69)
Component Tests and General Diagnostics
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
The content of this article and images reflects the changes identified in TSB - 10-13-008.

FUEL PRESSURE TEST

Required Special Tools:
- MB991958: Scan tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
- MB991637: Fuel Pressure Gauge Set
- MB992001: Hose Adaptor
- MB992049: Quick Connector
- MD998707: Test Device

1. Release residual pressure from the fuel line to prevent fuel spray.

WARNING: TO PREVENT A FIRE, COVER THE HOSE CONNECTION WITH SHOP TOWELS TO PREVENT SPLASHING OF FUEL THAT COULD BE CAUSED BY SOME RESIDUAL PRESSURE IN THE FUEL PIPE LINE.

pic 1

2. Disconnect the fuel high-pressure hose at the fuel rail side.

3. Assemble the special tool MD998707 of special tool as shown in figure.

NOTE: The special tool MB992076 (injector test set) is compatible with the special tool MB998706 (injector test set).

In case of vehicle using (square) quick connector

W/ Square Quick Connector

pic 2

(1) Remove the injector installation adapter from the hose. Remove another hose together with the adapter and remove the adapter from the remaining hose.
(2) Install the special tool MB992049 (quick connector) and the special tool MB992001 (hose adapter) to the hose without the adapter.
(3) Remove the nipple of the bolt of the special tool MD998709 (hose adapter).
(4) Install the special tool prepared in the procedure (3) to the nipple that was removed together with hose in the procedure (1).

In case of vehicle using (round) quick connector

W/ Round Quick Connector

pic 3

(1) Remove the injector installation adapter from the hose. Remove another hose together with the adapter and remove the adapter from the remaining hose.
(2) Install the special tool MB991990 (quick connector) and the special tool MB992001 (hose adapter) to the hose without the adapter.
(3) Remove the nipple of the bolt of the special tool MD998709 (hose adapter).
(4) Install the special tool prepared in the procedure (3) to the nipple that was removed together with hose in the procedure (1).

4. Install the special tool assembled in step 3 between the fuel rail and the fuel high-pressure hose.

[When using the fuel pressure gauge]

pic 4

1. Via a suitable O-ring or gasket, install the fuel pressure gauge to the special tool that has already assembled as described.
2. Install the assembled fuel pressure measurement tools between the fuel rail and fuel high-pressure hose.

pic 5

1. Via a gasket, install the special tool MB991637 (fuel pressure gauge set) into the special tool that has already assembled as described.
2. Install the assembled fuel pressure measurement tools between the fuel rail and fuel high-pressure hose.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

pic 6

7. Connect scan tool MB991958 to the data link connector.
8. Use Actuator test 9 to drive the fuel pump. Check that there is no fuel leaking from any section when the fuel pump is operating.
9. Stop the fuel pump.
10. Start the engine and run at idle.
11. Measure fuel pressure while the engine is running at idle.

Standard value: Approximately 324 kPa (47 psi) at curb idle

12. Check to see that fuel pressure at idle does not drop even after the engine has been revved several times.
13. If any of fuel pressure measured in steps 11 to 12 is out of specification, troubleshoot and repair according to the table below.

pic 7

14. Stop the engine and observe fuel pressure gauge reading. It is normal if the reading does not drop within two minutes. If it does, observe the rate of drop and troubleshoot and repair according to the table below. Start, then stop the engine.
1. Squeeze the fuel supply line closed to confirm leak-down occurs from defective fuel pump check valve.
2. If pressure continues to drop with both fuel lines squeezed closed, injector(s) are leaking.

pic 8

15. Release residual pressure from the fuel pipe line.

WARNING: COVER THE HOSE CONNECTION WITH SHOP TOWELS TO PREVENT SPLASH OF FUEL THAT COULD BE CAUSED BY SOME RESIDUAL PRESSURE IN THE FUEL PIPE LINE.

16. Remove the fuel pressure gauge and special tool from the delivery rail.
17. Fit the fuel high-pressure hose to the delivery pipe.
18. Check for fuel leaks.
1. Use scan tool MB991958 to operate the fuel pump.
2. Check the fuel line for leaks and repair as needed.

19. Disconnect scan tool MB991958.

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Let me know what you find. Also, let me know if it starts right back up each time this happens.

Take care,
Joe

Hi,

My theory is this: Since you have a lean mixture, fuel pressure may be low to start. As the pump runs longer, it may be getting weaker as time passes causing what you described. As far as a good idle, that is when the least amount of fuel is required.

Please understand, this is a theory at this point. When it cools off again, it may begin working again. That is why I suggested checking pressure. I feel it is a good starting point.

Let me know.

Joe

Hi,

The high pressure hose will be at the end of the fuel rail. I attached a picture. Let me know if it helps.

Joe

Yes. They didn't provide a schrader valve. You actually will be putting a T in the fuel line so you can attach to it. I wish there was an easier way.

Joe