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Old 04-02-2013, 06:20 AM   #1 (permalink)
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2004 Impala hard to start

My dad has a 2004 Impala that is hard to start, and once it starts does not want to stay running when you let off the gas. He told me it's been harder to start lately but would clear out & run alright if he revved it a few times. This morning it would run but once he got off the gas pedal the car would die. Eventually he was able to get the car to start & stay running but it was not very responsive, and had a little bit of a missfire when revving. At idle the car sounded rough but not to the point where it was down a cylinder.

The car does need an EGR valve & has about 130k on the clock. He thinks the plugs might be fouled out and is going to replace them but I'm concerned as to what caused it. When he was able to get the car started he had to hold the pedal to the floor to get the car to start. I'm thinking that indicates the car is dumping too much fuel but not too sure since I wasn't able to diagnose it at all.

Any ideas as to what to look for?

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Old 04-03-2013, 02:24 PM   #2 (permalink)
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How do you know you need an EGR valve? Are you getting a check engine light? Any trouble codes when you scan the PCM? In general, I've found EGR failure to be pretty uncommon on these things. Have you tested the fuel pressure at all? If it's too low, the pump may be failing, and if it's too high, the pressure regulator may be going, and neither one specifically would probably give you a trouble code, but the side effects of either one of those failures may.

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Old 04-03-2013, 09:16 PM   #3 (permalink)
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He drove the car over to the auto parts store & there were three codes stored in the computer for the EGR valve. The car has had the check engine light on for over a year & it was for the EGR valve. Haven't checked the fuel pressure yet but he is wanting to replace the bad valve before attempting any other repairs/diagnosis

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Old 04-03-2013, 09:30 PM   #4 (permalink)
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How about u clean the egr first before you go throwing a new one at it.

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Old 04-04-2013, 12:02 PM   #5 (permalink)
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Hi I have a 2004 3.8 impala. I had the MAF go bad and it would not stay running. You COULD floor it and it would run but on the limiter and that blew out the cat. I only wish someone would have told me I could just disconnect the MAF and it would run. Really I just disconnected the MAF and the car ran fine but with a code. It went from undrivable to drivable. This is just info for you to keep in mind might save someone a tow someday. I got lucky and left the car and did some internet research and decided to go back to the car and try that idea before calling a tow truck. glad I did.

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Old 04-04-2013, 11:56 PM   #6 (permalink)
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Take out the IAC and clean it up, a gunked up IAC will cause a hard start if it gets really bad. Clean it up and it should help out with the hard starts.


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Old 04-05-2013, 12:17 AM   #7 (permalink)
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Quote:
Originally Posted by agmc4me View Post
Hi I have a 2004 3.8 impala. I had the MAF go bad and it would not stay running. You COULD floor it and it would run but on the limiter and that blew out the cat. I only wish someone would have told me I could just disconnect the MAF and it would run. Really I just disconnected the MAF and the car ran fine but with a code. It went from undrivable to drivable. This is just info for you to keep in mind might save someone a tow someday. I got lucky and left the car and did some internet research and decided to go back to the car and try that idea before calling a tow truck. glad I did.
Disconnecting the MAF is NOT a good idea at all

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Old 04-05-2013, 12:30 AM   #8 (permalink)
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You can unplug the MAF and drive it, doing so will set the PCM into a default MAF setting. I wouldn't go driving it for to long like that though.

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Old 04-05-2013, 12:44 AM   #9 (permalink)
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I knew it would throw a code but, didn't know the pcm would do that. Hmm weird. You would likely have poor gas mileage and perf though, right? The maf readings vary (obv) so, what does the pcm do? Just give a consistant reading?

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Old 04-05-2013, 12:52 AM   #10 (permalink)
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Yes, It pretty much sets the fuel trims, trans and ignition settings into default mode.

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Old 04-05-2013, 01:05 AM   #11 (permalink)
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Quote:
Originally Posted by SuperDave View Post
Yes, It pretty much sets the fuel trims, trans and ignition settings into default mode.
Gotcha. So def not something you'd want to do for a long period of time. Sort of a fail safe, if you will.

Thanks for the info I am still learning many new things

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TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
Jbl gto 6.5" and 6x9" with trunk amp bypass
Sony MEX-GS600BT stereo

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Old 04-05-2013, 07:39 PM   #12 (permalink)
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Hi Guys
New here but try your Crank Position Sensor goes bad and sometimes will not show a code. Causes poor starting cuting out or a no start situation.

Rusty

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