Help!

Z

Zach65

Registered
The flange on the left catalytic converter rusted through so I had that replaced. But, when the flange went bad, it got loud and the car started to shutter at low speeds (<10 mph) and run real crappy. So i had the flange redone and the car quieted up and the leak was gone, but the car still ran crappy at low speeds and at idle you can feel the car shake. So ran a diagnostic KOEO and threw codes 524 and 543. What is bad, fuel pump? Injector? O2? AllData says possible causes:
1) open in power-to-pump circuit between VCRM and FPM splice.
2) Open in B(+) supply to VCRM (pins 4 and 5)
3) Left heated oxygen sensor (HO2S) short to power.
Help me interpret this stuff, my gas mileage is horrible and I can't drive with this shudder for long! Want to make sure the O2 is bad before I replace it.
Also, for the record, I have 98,000 miles on the stock plug wires, but new plugs.
Thanks in advance.
1965 Mustang in primer
1995 Mark VIII
http://memimage.cardomain.net/member_images/3/web/771000-771999/771311_5_full.jpg
 
RE: Help!

[div class="dcquote"][strong]Quote[/strong]
... I have 98,000 miles on the stock plug wires, ... [/div]

ding ding ding!
 
RE: Help!

But why would my plug wires suddenly go bad when my left cat has a flange go bad and then the computer says there might be an open circuit having something to do with the left O2 sensor. Sounds a little ironic to me. I am sure it wouldnt hurt to put new plug wires on the car, but I am on a tight budget and dont want to replace things that arent causing major problems, unless they are. Especially since I am selling the car so I can buy a '98 Mark.
1965 Mustang in primer
1995 Mark VIII
http://memimage.cardomain.net/member_images/3/web/771000-771999/771311_5_full.jpg
 
RE: Help!

See what the wires do first, clear the codes and follow through with a check for new codes.
 
RE: Help!

Glad to hear you got it running right. Assuming you clear the codes by disconnecting the battery for a few minutes, check for any new or returning codes. Usually, the first code to return is what you need to concentrate on. Too many times, one fault will lead to another code and it is important to get the first offender, particularly on ignition, fuel and emissions.
 
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