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Discussion Starter #1
Have you guys ever used a catalyst converter clearner. I found couple on the web, not sure if that really works. My car is running like crap below 50. I suspect that the converter is clogged on my focus (125k miles).
 

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New one for me as well.

I would be VERY leery of anything that claims to clean the converter.

If you are pushing something through it and there is an obstruction, it could create all kinds of problems. Not the least of which is FIRE.

Also, you could damage/destroy the O2 sensors, send the ECU into a tailspin and create all kinds of additional running problems.

Are you sure it is the converter?

What symptoms are you experiencing?
 

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Discussion Starter #4
I am not sure, but the Local mechanic suspect that it's Catalyst Converter.

My car hesitates under 50. I changed pretty much everything that I found on this forum

Spark Plugs, Spark Plug Wires, Air Filter, Fuel Filter, O2 Heated Sensor, TPS, PCV Valve, PCV Hose

The car is not throwing any code. Plus, the mechanic scanner didn't find any code. I am in a mess for sure. I don't want to keep adding parts.
 

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Where you in michigan? I have a gutted cat in my garage you could use to find out if it is your cat.
 

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I am not sure, but the Local mechanic suspect that it's Catalyst Converter.

My car hesitates under 50. I changed pretty much everything that I found on this forum... I am in a mess for sure. I don't want to keep adding parts.
The usual symptom of a clogged catalytic converter is a general lack of power at all speeds, not a hesitation or stumble at low speed. Furthermore, cats don't just up and clog for no reason; they're usually caused something else, most often long-term oil consumption or fuel system problems. I think your mechanic is grasping at straws. [screwy]

I'm thinking you've got some sort of fuel system problem. Does this problem occur when you accelerate suddenly, or does it occur as you steadily accelerate through a certain speed or RPM range?
 

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Oh carguychris! I didn't know that, I am from Spain and as far as the cat works they let you get a used one.

How long can it take to get a cat clogged?
 

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Discussion Starter #11
carguychris - The loss of power and hesitation happens when I accelerate suddenly after braking. It also happens when I start from a stop light or stop sign. The car run great over 60 miles. Unfortunately, I don't have RPM guage on my SPI. I am thinking of buy one though.
 

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The chances of having a clogged cat are very slim, it sounds to me like you are having fuel issues... maybe a clogged fuel filter or the fuel pump starting to go out.
 

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I am not sure, but the Local mechanic suspect that it's Catalyst Converter.

My car hesitates under 50. I changed pretty much everything that I found on this forum

Spark Plugs, Spark Plug Wires, Air Filter, Fuel Filter, O2 Heated Sensor, TPS, PCV Valve, PCV Hose

The car is not throwing any code. Plus, the mechanic scanner didn't find any code. I am in a mess for sure. I don't want to keep adding parts.
i didnt see EGR/DPFE on that list. look into it if u havent already.
also double check all vaccuum lines, and clean your MAF

edit: just noticed it was SPI, do they even have egr?
 

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Discussion Starter #16
i didnt see EGR/DPFE on that list. look into it if u havent already.
also double check all vaccuum lines, and clean your MAF

edit: just noticed it was SPI, do they even have egr?

Yes. SPI have EGR. I've never replaced DPFE or EGR.
 

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The chances of having a clogged cat are very slim, it sounds to me like you are having fuel issues... maybe a clogged fuel filter or the fuel pump starting to go out.
+1. Get the fuel pressure checked. I think you've got a fuel pressure problem that's causing the car to momentarily run rich or lean (most likely the latter) when you begin to accelerate. At cruise, the ECU is compensating for it by adjusting the amount of fuel it injects; it just can't react fast enough during sudden low-speed acceleration.

If the SPI engine has a conventional EFI system with a fuel-return line, add the fuel pressure regulator (FPR) to the list. OTOH if the SPI lacks a fuel return line, the pressure is regulated by the pump, and it's probably going out as 03OrangeSVT suggests.

Another slightly less likely possibility is one or more clogged fuel injectors.
 

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Discussion Starter #18
+1. Get the fuel pressure checked. I think you've got a fuel pressure problem that's causing the car to momentarily run rich or lean (most likely the latter) when you begin to accelerate. At cruise, the ECU is compensating for it by adjusting the amount of fuel it injects; it just can't react fast enough during sudden low-speed acceleration.

If the SPI engine has a conventional EFI system with a fuel-return line, add the fuel pressure regulator (FPR) to the list. OTOH if the SPI lacks a fuel return line, the pressure is regulated by the pump, and it's probably going out as 03OrangeSVT suggests.

Another slightly less likely possibility is one or more clogged fuel injectors.
I remember getting free "Recall fuel Pump" work done on my Focus 4 yrs ago. Do you think that fuel pump will die/malfunction again ? I am going to get "Fuel Pressure" test done through my Dealer and narrow down this issue.
 

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Discussion Starter #19
+1. Get the fuel pressure checked. I think you've got a fuel pressure problem that's causing the car to momentarily run rich or lean (most likely the latter) when you begin to accelerate. At cruise, the ECU is compensating for it by adjusting the amount of fuel it injects; it just can't react fast enough during sudden low-speed acceleration.

If the SPI engine has a conventional EFI system with a fuel-return line, add the fuel pressure regulator (FPR) to the list. OTOH if the SPI lacks a fuel return line, the pressure is regulated by the pump, and it's probably going out as 03OrangeSVT suggests.

Another slightly less likely possibility is one or more clogged fuel injectors.
I got new Fuel filter last week. Fuel pump was installed approx 4 yrs ago under recall
 

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I think you've got a fuel pressure problem that's causing the car to momentarily run rich or lean
If that happens wouldn't the ECU activate DTCs for engine too rich or too lean?

EGR problems don't affect the car performance so strongly.
 
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