Mazda Protege 2003 Cold Start

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 12, 2015

• #1

Good Day Guys,

So when I'm going to start my car cold it cranks fine but before the car starts the car chugs twice as if its struggling to get that spark to turn on the engine but after that the car turns on fine. I would have to wait till tomorrow to post a video. Battery is new and the weather outside 73 degrees F. When I start the car throughout the day it works perfectly fine. I'm just concerned about that weird chug as if its going to die.

Thank You

 

concept

:

San Diego, CA

:

2014 Mazda3 S GT auto, 2008 MX5 6-speed

• Aug 12, 2015

• #2

How old is your timing belt?

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 12, 2015

• #3

Recently Replaced

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 13, 2015

• #4

I went to the mechanic today and I got two CEL's P0421 and P0090, could these two issues be the cause to my semi rough start?

 

concept

:

San Diego, CA

:

2014 Mazda3 S GT auto, 2008 MX5 6-speed

• Aug 13, 2015

• #5

P0421: http://www.obd-codes.com/p0421

P0090:
Fuel Pressure Regulator Control Circuit


Possible causes

- Faulty fuel pressure sensor
- Fuel pressure sensor harness is open or shorted
- Fuel pressure sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)

What about the obd code?

If the current is outside of the expected range, DTC P0090 Mazda will set.

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0090 Mazda Description


The Engine Control Module (ECM) supplies power and ground to the Fuel Rail Pressure (FRP) regulator. The ECM monitors current on the circuits to detect a failure.


I suspect this may be the stumble issue of which you wrote.

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 14, 2015

• #6

I will replace the part and see if it improves the start and removes the CEL and I will update you guys

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 15, 2015

• #7

Where would the Fuel Pressure Sensor be located I recently got this car and I don't know where it is , Would the Fuel Injection Pressure regulator also be involved there could be air intake leak from that specific part that could be flooding my car when i start it cold

 

H

hornsfan10609

Certified Mazda Tech

:

2003.5 Mazdaspeed Protege x2

• Aug 16, 2015

• #8

I don't think the car is flooding, modern ECU controlled cars don't really flood themselves. The Fuel pressure solenoid is the small black solenoid on top of intake manifold near the throttle body. It has a brown connector and a little brown dot on top of the solenoid. You can get them a dime a dozen used at a junkyard but you run the risk of getting another bad solenoid so grab a handful, or buy a new one but they are about $100 a piece.

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 16, 2015

• #9

https://www.amazon.com/dp/ (commissions earned)

Pretty cheap on Amazon, I will purchase this piece and keep you guys updated on the fix.

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 26, 2015

• #10

Alright reporting back, I changed the EGR Vacuum Solenoid (AKA P0090), and the code is now gone, I'm stuck with the P0421 code but I'm going to do the non fouler using this product , https://www.amazon.com/dp/ (commissions earned)
As far as my cold starts my car turns over but my engine still struggles to turn on, I believe it may be the Fuel Pump not priming enough pressure to spark my engine up.
overall the car runs fine besides that cold start.

 

J

Jungle_Jonny

Member

:

Mazda Protege 2003

• Aug 30, 2015

• #11

if you listen closely to 0:14 here the car struggles to start, in this video it was not so bad but sometimes it chugs to turn on, battery is new though