2005 Kia Amanti Code P0401...

2005 KIA AMANTI
147,000 MILES • 3.5L • V6 • FWD • AUTOMATIC
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PRESSLAND
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2005 Kia Amanti. I had codes P0401,P0174 and P0171. I did change mass Air flow sensor,Egr vacuum switch,Egr valve , clean the egr tube ,put new egr hoses,change Map sensor ,change timing belt,water pump and so on...I did spend a lot of money.

I need HELP... !!! After I did all that...I did clear the codes . Hard to start /crank...After start ... the car drives the same like when I started the problems.Nothing change. When engine runs and I stop the car wants to move/go and the engine runs with rough idle, misfiring, hesitation , lack of power and sometimes stalling.

The code came again but just one , P0401. Can you tell me how to fix it or what do you think is the problem?Any professional suggestion or answer ? We did try everything...

Thank you,
Takis
Aug 22, 2014 at 9:23 AM
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HMAC300
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check fuel pressure with a gauge sounds low autparts rent it
Aug 22, 2014 at 9:26 AM
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PRESSLAND
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I did change the fuel pump ,fuel filter last year .
I will check the fuel pressure...
Why it gives me P0401 code for EGR problem?
Thank you,
Takis
Aug 22, 2014 at 12:32 PM
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HMAC300
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do this test of egr in pic.... it cold be a plugged egr port though
Aug 22, 2014 at 12:57 PM
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PRESSLAND
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Thank you for your respond...
It's so annoying...
Everything looks good.
Still code P0401.
I did fuel pressure w/50 which that's what supposed to be.
I don't know what else to check.
Please let me know if you have any other ideas.
How can I check if the ECM /PCM it's bad ?
Thank you
Aug 25, 2014 at 2:57 PM
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HMAC300
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if yo had a scanner pro style you could activate the solenoid to see if it' sworking if it si then it may lead ot a bad pcm or a poor connection at either end. a pro shold really check for that though.
Aug 25, 2014 at 3:38 PM