2004 impala only starts and runs when gas pedal is pushed but dies when let off

Asked by Nov 14, 2014 at 07:58 PM about the 2004 Chevrolet Impala LS

Question type: Maintenance & Repair

my car will crank but wont start but when i hold gas pedal in and it runs as long as i hold gas soon as i let off gas it dies ive tried fuel pump maf sensor map sensor throttle postion sensor made no difference then car works fine for a couple day and will do the same thing

13 Answers

19,880

How about fuel filter, fuel pressure regulator or fuel injectors? Also and maybe first thing, look at the throttle plate (butterfly) itself. Make sure its clean. If not clean it well with carb cleaner.

2 of 2 people found this helpful.
19,880

Oh, good call T_S_T!

2 of 2 people found this helpful.
67,465

Just to add to my buddy TA77,answer,thought of two thing,s,,The IAC,and the crank sensor,will do this on the impala.And hello,, TA.

1 of 1 people found this helpful.
19,880

What's going on T_S_T?

2 of 2 people found this helpful.
67,465

Nothing much Ta, hows it going for you,just chiling trying to help a few people out with there problem,s,,same as you : )

1 of 1 people found this helpful.
19,880

Not bad, not bad. Freezing my a$$ off though. Just took my dog out its about 22. Not ready for this cold this fast.

2 of 2 people found this helpful.
67,465

Lmao,yea i here ya,only 32 here,but dropping fast.

1 of 1 people found this helpful.
10

did you find a solution? I have the same problem to

19,880

Hey Dana, its going to be the fuel pressure regulator, throttle plate probably needs to be cleaned too. Start with the throttle plate first.

1 of 1 people found this helpful.
10

Awsome! Thanks TransAm77 I will clean it and report back.

1 of 1 people found this helpful.
19,880

Ok sounds good.

1 of 1 people found this helpful.

I am having a similar type issue, however My 2000 Impala does not rough idle. It turns over and as long as my foot is on the gas it runs, the moment I take my foot off the gas it stalls. I am currently replacing the fuel filter. The fuel pump was replaced a year ago, I am going to clean the throttle body next but I am unsure if I am really needing to do this or if there is something else I should be doing. I'll be damned if I take this car back to the shop just so it can break down again ( thinking my impala is a lemon it has been in the shop more than I have been driving it)

I had a similar issue. There was carbon build up in the fuel injection system. Once the idle air control valve was cleaned and fuel induction service was performed, the car started and idled fine.

Your Answer

Impala

Looking for a Used Impala in your area?

CarGurus has 34,619 nationwide Impala listings starting at $1,000.

ZIP:

Chevrolet Impala Experts

  • #1
    Js08016
    Reputation
    1,840
  • #2
    Tom Demyan
    Reputation
    1,750
  • #3
    Danny Wang
    Reputation
    1,680
View All

Related Models For Sale

Used Chevrolet Malibu
1,242 Great Deals out of 77,953 listings starting at $1,500
Used Honda Accord
997 Great Deals out of 62,552 listings starting at $999
Used Chrysler 300
375 Great Deals out of 16,713 listings starting at $1,000
Used Nissan Maxima
328 Great Deals out of 23,618 listings starting at $1,750
Used Ford Mustang
741 Great Deals out of 42,668 listings starting at $1,300
Used Nissan Altima
1,124 Great Deals out of 74,485 listings starting at $999
Used Toyota Camry
1,067 Great Deals out of 72,796 listings starting at $1,000
Used Buick LaCrosse
340 Great Deals out of 18,687 listings starting at $1,500
Used Chevrolet Tahoe
620 Great Deals out of 36,026 listings starting at $1,800
Used Chevrolet Silverado 1500
2,123 Great Deals out of 183,386 listings starting at $1,900
Used Chevrolet Monte Carlo
12 Great Deals out of 1,347 listings starting at $995

Used Cars For Sale

2018 Chevrolet Impala LS For Sale
804 listings starting at $23,206
2017 Chevrolet Impala LS For Sale
7 Great Deals out of 1,971 listings starting at $16,990
2016 Chevrolet Impala LS For Sale
5 Great Deals out of 292 listings starting at $14,185
2015 Chevrolet Impala LS For Sale
4 Great Deals out of 283 listings starting at $10,750
2014 Chevrolet Impala LS For Sale
8 Great Deals out of 358 listings starting at $9,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.