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Old 11-19-2009, 03:18 PM   #1 (permalink)
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Bucking/no accel

I have a 03 LS that is having problem. It poped the check engine light right when it started running like crap. And has steadly gotten worse to the point it is now. Which is when you hit the gas it sounds like its choking and will not accel barely. I went and got the codes pulled.

First was p0404 (egr system fault)

Next was p0128 (Coolant temp is always low)

I replaced the EGR, full tune up(spark plugs, wires, fuel filter, and air filter)

Still have same problem. Also replaced the purge valve. Not sure if thats the name. I have always called them feedback sensors(jeep lingo)

Some people have asked me about the MAF and that was replace about a year ago due to getting water in the intake.

So now im stuck and dont know where to go with it.

Any suggestions

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Old 11-20-2009, 08:15 AM   #2 (permalink)
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Are you still getting the same codes as well?

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Old 11-21-2009, 06:27 AM   #3 (permalink)
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How Many miles are on the Impala? It may be a plugged cat, when my 92 Caprice with 150000 miles started running like crap I found that the cat was bad.. Also have you replaced the fuel filter?
Has the thermostat been replaced? It may be stuck open, if you do look to the 160 Deg stat..

You may want to buy a OBDII code reader that has a display they sell for $ 80.00 or so..

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Old 11-21-2009, 08:22 AM   #4 (permalink)
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Same codes are popping up and i changed the fuel filter. Just put the tank back in just due to the milage wanted to check out the fuel pump. The car has 163000 miles on it. I wanted to check the cat out but it all welding in. So i have to take it up to the shop and cut it off and take a look at it. The coolant stuff is that the switch is bad waiting on one to come in. Im also doing the theromostat at the same time.

Right now its still doing the same though

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Old 11-24-2009, 07:28 AM   #5 (permalink)
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Have the shop do a back pressure test on it. I agree that it's most likely a clogged cat at this point.

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in·sane   /ɪnˈseɪn/ Show Spelled[in-seyn] Show IPA
–adjective
1. not sane; not of sound mind; mentally deranged.
2. of, pertaining to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
3. utterly senseless: an insane plan.
4. Swapping a 3.8V6 Supercharged into an 05 Base Impala.
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Old 11-24-2009, 08:02 AM   #6 (permalink)
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Quote:
Originally Posted by wanderson75 View Post
Have the shop do a back pressure test on it. I agree that it's most likely a clogged cat at this point.
I'll put $5 on a clogged cat.

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Old 11-24-2009, 09:48 AM   #7 (permalink)
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Backed up kitty.

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Old 11-24-2009, 11:07 AM   #8 (permalink)
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Quote:
in·sane   /ɪnˈseɪn/ Show Spelled[in-seyn] Show IPA
–adjective
1. not sane; not of sound mind; mentally deranged.
2. of, pertaining to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
3. utterly senseless: an insane plan.
4. Swapping a 3.8V6 Supercharged into an 05 Base Impala.
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