2003 Protege5 Bogging

pcb

The Diagram Dude
:
2002 MP5
... Another thing to check is the fuel pump relay under the hood. They get crispy and corroded after while.

I remember a guy whose car would die spontaneously out of nowhere and had it looked at and everything tested fine but it still kept happening.
He was on the verge of getting rid of the car.
It was a safety issue.

Finally, the mechanics fully warmed up the car and found that the fuel pump relay would only fail when the car was hot.

They replace the fuel pump relay and his car was fixed.
 

pcb

The Diagram Dude
:
2002 MP5
... I'll prolly just go ahead and replace the filter/pump, coils plugs n wires, crankshaft sensor (it has some light fraying in a couple spots on the wiring along with the actual sensor looks like the oldest n dirtiest part under the hood), thermostat and the o2 sensors.

Apparently, the best plugs to use for our car are the regular NGK V-Groove copper plugs.

They give the strongest most reliable spark, but they do wear quicker and need to be re-gapped or replaced more often, but that is an easy job with our car.

The regular plugs are dirt cheap too.
 

pcb

The Diagram Dude
:
2002 MP5
You may want to consider an engine flush and fuel system treatment as well.

Our engine is prone to piston oil ring seizure and starts to burn oil.

It seems like at least half the people here on the forum are burning oil.

I use seafoam, which some say is just snake oil, but my car doesn't burn a drop of oil.

You can put half a can in the oil to flush the engine and half a can in the gas tank to clean the fuel system.

After I flushed the crap out of my engine, I put half a can in the oil at every oil change and leave it in until the next oil change, and I put a shot in the gas at every fuel fill-up.

My idle is as smooth as glass now and hasn't bounced around since I started using it.

At the very least, make sure you change your engine oil every 3,000 miles to flush out all the burnt up brown crap.
 

Halfbaked

The F*** Up King
:
Depths of Hell
:
'03 Protege5
At the very least, make sure you change your engine oil every 3,000 miles to flush out all the burnt up brown crap.

I'm a stickler for 3k oil changes, I don't ever miss that marker for my oil changes!

Thanks for the info, I'll read/reply when I can since I'm at work. I appreciate it!
 

Halfbaked

The F*** Up King
:
Depths of Hell
:
'03 Protege5
Got the scanner in the mail yesterday but I didn't get home from work until after dark. Here's what I got for codes
 

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pcb

The Diagram Dude
:
2002 MP5
Got the scanner in the mail yesterday but I didn't get home from work until after dark. Here's what I got for codes

It looks like you may have smoked your pre-cat.
But maybe not.
Clear the codes and see if they come back.


Fuel trim is something worth monitoring when looking for fuel/air problems.

Keep your tank topped up until you get your parts replaced.
 

Halfbaked

The F*** Up King
:
Depths of Hell
:
'03 Protege5
It looks like you may have smoked your pre-cat.
But maybe not.
Clear the codes and see if they come back.


Fuel trim is something worth monitoring when looking for fuel/air problems.

Keep your tank topped up until you get your parts replaced.

I completely forgot to share this info, but omw home from work yesterday it drove fine to the nearest gas station at 7/8ths of a tank but I still stopped to fill er up... Within 2 miles down the interstate from the station it started doing it again with a completely full tank and continued doing it for the remaining 12 mile drive home. Once I got off the highway it did it again on the takeoff from the exit ramp for roughly 3 seconds and once it cleared the cel started flashing. When I started it this morning it wasn't flashing, does it throw a different code than what's pictured to make it flash?

Today I cleared the codes and have driven it roughly 25 miles. It only bogged down twice and both times were only during takeoffs and only lasted roughly 7 seconds the first time and 3 seconds the second time
 

pcb

The Diagram Dude
:
2002 MP5
When I started it this morning it wasn't flashing, does it throw a different code than what's pictured to make it flash?


The CEL only flashes while the engine is actually misfiring, then it goes solid after the ECU stops the misfiring.

Your car didn't happen to misfire the next day, perhaps because it had cooled off.

If your CEL flashes continuously for more than about 30 seconds, you have most likely cooked your pre-cat.

You're not even supposed to bump start a 5-Speed P5 because of the unburnt fuel that goes through.

But don't worry about that.
There's an easy workaround to clear the code.







Your car is really sick right now.

Is there any way you can stop driving your car until after your fuel pump and filter are replaced?

It's getting really fouled up right now being stuck in limp mode.
You could be fouling or wrecking your O2 sensors and even damaging your main cat?

I'm not sure, but if this means short and long term fuel trim, it doesn't look right.

It may be proof that it's in limp mode?

0.0% and -100.8%.


 

323

(u_u) ...zZzZzzz
Moderator
If the fuel pressure is too low the engine will misfire, but quality, new coils are never a bad idea or a waste of money.
I didn't wait for problems and just replaced my coils.

And keep them spare coils in the trunk just in case! lol
 
:
2003 protege 5
Coils and plugs for sure. You could try removing and cleaning the 02 sensor wiping it off with tb cleaner or rubbing alcohol and see if the 421 code goes away. The non fouler is great as long as you don't live in CA they frown on those here. But theyre cheap and easy to install and work 99% the time. And reset the ecu after so you do the fixes.
 

Halfbaked

The F*** Up King
:
Depths of Hell
:
'03 Protege5
Your car is really sick right now.

Is there any way you can stop driving your car until after your fuel pump and filter are replaced?
....................................

Yeah, I'm not gonna drive it until I change the plugs, wires, coils, fuel pump/filter and the crankshaft sensor

......................................

I'm not sure, but if this means short and long term fuel trim, it doesn't look right.

It may be proof that it's in limp mode?

0.0% and -100.8%.
<

I'm not sure if every feature of the app works correctly, do you have a recommendation for apps to use with the bluetooth OBD's?
 

Halfbaked

The F*** Up King
:
Depths of Hell
:
'03 Protege5
Coils and plugs for sure. You could try removing and cleaning the 02 sensor wiping it off with tb cleaner or rubbing alcohol and see if the 421 code goes away. The non fouler is great as long as you don't live in CA they frown on those here. But theyre cheap and easy to install and work 99% the time. And reset the ecu after so you do the fixes.

I'm in Ohio and I ordered a new O2 sensor also, all of my parts will be here by the weekend. I should get everything by Friday so by Saturday everything should be done... I'll follow up as soon as I get it done!
 
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