My car is seriously emitting black smoke from the exhaust pipe

Tiny
THEHASSAN
  • MEMBER
  • 2002 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 308,923 MILES
A technician helped to change the airflow meter but the smoke still persisted. Can this be brain box (PCM-ECU) problem? Kindly help me diagnose the problem. The engine still sounds good and steam normally in the morning. Thanks.
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Sunday, September 29th, 2019 AT 9:04 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

Black smoke is usually an indicator of a rich fuel mixture. The first thing I would confirm is that the fuel pressure is within spec and the regulator is good. Here is a link that shows how to check fuel pressure:

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

Here are the manufacturer's specs for pressure:

2002 Toyota Camry SE Sedan L4-2.4L (2AZ-FE)
Pressure, Vacuum and Temperature

Fuel Pressure

Fuel Pressure 304 - 343 kPa (3.1 - 3.5 kgf.sq.cm,44-55 psi)
147 kPa(1.5 kgf/sq.cm,21 psi) or more

Now, there are many other things that can cause it. Do me a favor. Take a look through this link. It explains the different areas which can lead to this problem. As far as your original question, the PCM/ECM are most likely not the issue. However, we need to start at one diagnostic point and move on. In my mind, I have a feeling it is a fuel pressure issue (too high) being caused by a faulty regulator.

Here is the link:

https://www.2carpros.com/articles/engine-black-smoke

Let me know if this helps or if you have other questions.

Take care,
Joe
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Sunday, September 29th, 2019 AT 7:44 PM
Tiny
THEHASSAN
  • MEMBER
Please kindly help in locating the fuel pressure regulator. (Automatic transmission). My auto technician could not locate it neither does he knows how to replace it. I will appreciate if you can attach video of fuel pressure regulator replacement technique. Thanks
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Monday, October 7th, 2019 AT 1:24 PM
Tiny
THEHASSAN
  • MEMBER
Does my car have fuel pressure regulator? If yes, kindly let us know how the genuine fuel pressure regulator looks like and how to replace. Thanks.
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Monday, October 7th, 2019 AT 1:30 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

The vehicle has a fuel pressure regulator. The regulator and fuel filter are part of the fuel pump assembly module. Everything would be replaced as a unit.

Have you confirmed that the pressure is high?

Let me know.
Joe
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Monday, October 7th, 2019 AT 5:24 PM
Tiny
THEHASSAN
  • MEMBER
Thanks so much for the explanation. The technician has no gunge to check the pressure. The fact is you are the one guiding the technician now. Thanks.
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Thursday, October 10th, 2019 AT 2:53 AM
Tiny
THEHASSAN
  • MEMBER
Again, for confirmation stage, the Car I am talking about is listed above SE. Are you sure the fuel pressure regulator is inbuilt inside the fuel pump? Let me check elsewhere to get the fuel pressure checked? I really appreciate you sir. Thanks.
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Thursday, October 10th, 2019 AT 3:04 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

Here are the directions for checking fuel pressure specific to your vehicle. The attached pics correlate with these directions.

2002 Toyota Camry SE Sedan L4-2.4L (2AZ-FE)
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
ON-VEHICLE INSPECTION

1. CHECK FUEL PRESSURE

pic 1

a. Prepare for inspection.
1. Purchase the new fuel tube and take out the fuel tube connector from its pipe.

HINT: Part No.23901-28130

b. Work for prevent gasoline from spilling out.

Pic 2

c. Remove the fuel pipe clamp No.1 from the fuel tube connector.

Pic 3

d. Disconnect the fuel tube connector from the fuel pipe while pinching part A with fingers as shown in the illustration.

CAUTION:
- Perform disconnecting operations of the fuel tube connector (quick type) after observing the precautions.
- As there is retained pressure in the fuel pipe line, prevent it from splashing inside the engine compartment.

Pic 4

e. Install SST (pressure gauge) as shown in the illustration by using SST and fuel tube connector.
SST 09268-41047 (90467-13001, 95336-08070), 09268-45012 (09268-41250)

f. Wipe off any splattered gasoline.
G. Reconnect the negative (-) terminal cable to the battery.
H. Connect the hand-hand tester to the DLC3.
I. Measure the fuel pressure regulator.
Fuel pressure:
304 - 343 kPa (3.1 - 3.5 kgf/sq. Cm, 44 - 50 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the fuel hoses and connections, fuel pump, fuel filter and fuel pressure regulator.

J. Disconnect the hand-held tester from the DLC3.
K. Start the engine.
L. Measure the fuel pressure at idle.
Fuel pressure:
304 - 343 kPa (3.1 - 3.5 kgf/sq. Cm, 44-50 psi)

m. Stop the engine.
N. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/sq. Cm, 21 psi) or more If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

O. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST and fuel tube connector to prevent gasoline from splashing.
P. Reconnect the fuel tube (fuel tube connector).

CAUTION: Perform connecting operations of the fuel tube connector (quick type) after observing the precautions.

2. CHECK FUEL PUMP OPERATION AND FUEL LEAK
a. When using hand-held tester
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and hand-held tester main switch ON.

NOTE: Do not start the engine.

3. Select the active test mode on the hand-held tester.
4. Please refer to the hand-held tester operator's manual for further details.

Pic 5

b. When not using hand-held tester
1. Remove the circuit opening relay.
2. Using a service wire connect terminals FP and +B of the relay block.

NOTE: Pay due attention to the terminal connecting position to avoid a malfunction.

3. Turn the ignition switch ON, and check that the fuel pump operates.

NOTE: Do not start the engine.

C. Check that there are no fuel leaks after doing maintenance anywhere on the fuel system.

_________________________________________

As for the regulator, here is what my manual says.

" A compact fuel pump in which a fuel filter and pressure regulator are integrated in the module fuel pump assembly has been adopted."

Let me know if any of this helps or if you have questions.

Joe
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Thursday, October 10th, 2019 AT 6:47 PM

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