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  1. #1
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    tap the gas at idle... almost stalls

    I've noticed this for a while now. Say I'm at a stop sign and the engine is idling, when I go to accelerate, there is a slight pause like the engine just stopped running for a split second. The engine drops in rpms and then jumps back up and goes fine. Sometimes it's bad, sometimes I can't even notice it. But it seems that if I really try, I can get it to stall sometimes by just tapping the gas pedal once very quickly. But if I press the pedal slowly and gradually, there is no problem at all.
    This happens whether I am in gear or not. Any ideas?
    -Dan<br /><br />'91 Cutlass Supreme, 3.1L 76,050 miles<br />'97 Cutlass Supreme, 3100 152,500 miles

  2. #2

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    tap the gas at idle... almost stalls

    Exaust manifold? Catalytic converter full?

    Too much rush at the exit. Kinda like as if someone covered the tailpipe?

  3. #3
    Lurker DiscoStudd's Avatar
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    tap the gas at idle... almost stalls

    Any trouble codes being set? My first thought is the Throttle Position Sensor, followed by the MAF (mass airflow) sensor. If your MAF is bad, you can unplug it and the ECM will set a default airflow table, allowing the car to run normally (albeit not at top efficiency.) The TPS is like a rheostat, and over time wears out in certain spots causing the throttle response to lag.

    Either sensor going bad will illuminate the Service Engine Soon light...

    Kevin B.
    2004 Chevy Impala 3400 V6 - Color: Victory Red

    1999 Chevy Tahoe 5.7 Vortec V8 - Color: You guessed it, Victory Red!

  4. #4

    tap the gas at idle... almost stalls

    Oh wow, same thing is happening to me. I got a service engine soon light. A shop was supposed to have fixed the light when my car wouldnt start. Now its back again. but my car does the same throttle thing.
    -Nick
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  5. #5
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    tap the gas at idle... almost stalls

    Good, at least I know I'm not alone. So far my engine has just under 60,000 miles on it, and I baby it as far as driving style and general maintenance is concerned. I never got a service light for anything, except once when I installed the WAI, I forgot to re-connect the IAT sensor to the intake pipe. But as soon as I did that, it went away. The exhaust is tight, no leaks. And I'm pretty sure my cat is ok, even though my exhaust stinks like sulfur most of the time. Looks like I will be playing with the sensors DiscoStudd mentioned and see what effect they will have on this. By the way guys, thanks for the quick responces, this forum is awesome.
    -Dan<br /><br />'91 Cutlass Supreme, 3.1L 76,050 miles<br />'97 Cutlass Supreme, 3100 152,500 miles

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    tap the gas at idle... almost stalls

    Sulfur = Bad Cat

    Get the cat replaced and figure out why your car killed the ca in the first place.
    -Jon-
    <br />1995 Chevrolet Impala SS - Sickly Stock
    <br />2000 Chrysler Concorde 3.2 Auto, Pimp, 19 inch rims, lowered 2 inches, pearlized white paint, and 1400watt stereo.
    <br />

  7. #7
    1990lumina's Avatar
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    tap the gas at idle... almost stalls

    My Lumina does that too...but only when it is in park. While driving all is well

    - Jeff L.
    Jeff L. :: 2nd Canadian to win COTM The Preservation for POS W-bodies Canada Chapter
    2004 Acura TSX | 2.4L I4 iVTEC; 5 Speed Auto | 1 of Many Made In '04 | 89,XXXKM
    1990 Chevrolet Lumina Euro 3.1 | 3.1L 191ci 60 V6; 440T4 | 1 of 43,912 Made In '90 | 194,XXXKM
    1985 Mazda RX-7 S | 1.1L 70ci 12A Twin Rotor RE; 5spd | 1 of 63,105 Made in '85 | 130,XXXKM

  8. #8

    tap the gas at idle... almost stalls

    Idle air control.. sounds like your chokeing it.
    could also be bad plugs
    1995 lumina LS 3.4DOHC 198k miles - retired!<br />Coming Soon- 1995 Crate motor hooked to a reman 3.73 FDR 4t60e with stalls and HD-upgrade. Adding headers non-hackjob. I love my friends! Scott you ROCK!<br />&nbsp; http://memimage.cardomain.net/member_images/4/web/436000-436999/436966_123.jpg<br />**Signature Pic Removed*<br />*MAXIMUM SIG PHOTO SIZE 600 X 150 *<br />http://www.w-body.com/forum/index.php/topic,60683.0.html

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    tap the gas at idle... almost stalls

    Mine used to do that, but it went away.
    &#039;89 Cutlass Supreme 3.1 2dr,&nbsp; &#039;90 GMC 4X4<br />&#039;84 K5 BLAZER 4X4,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &#039;86 Vette<br />&#039;97 Saturn 5spd<br />

  10. #10

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    tap the gas at idle... almost stalls

    mine does that too, sometimes its real back other times its fine, it should be noted that teh entire exaust was replaced last year even tho its leaky and loud from what I can tell, and th eplugs were replaced liek 3 weeks ago

    <br />http://members.cardomain.com/stealthman80

  11. #11
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    tap the gas at idle... almost stalls

    I changed the plugs, wires, and also have new mufflers. Aside from bad sensors, do you think changing the plugs or wires could do this? I'm using delco rapid fires and auto-lite wires.
    -Dan<br /><br />'91 Cutlass Supreme, 3.1L 76,050 miles<br />'97 Cutlass Supreme, 3100 152,500 miles

  12. #12
    3pt1lumina's Avatar
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    tap the gas at idle... almost stalls

    Dad's 97 Lumina is doing that... Plugs and wires made a difference, however, maybe it is a clogged injector(s)?

    ---The Cavalry---| 1975 Laguna | 1977 Chevelle | 1977 Monte Carlo |1990 Lumina | 1996 Lumina | 1997 Lumina | 1999 Lumina LS | 1999 Monte Carlo Z34 | 1999 Regal GSE | 2009 Malibu LT | 2013 Malibu LS | It's a sickness...

  13. #13

    tap the gas at idle... almost stalls

    My Lumina does the same thing.

    I was thinking it had something to do with the intake gaskets (original) or the lazy o2 sensor (also original). The car has 181k miles on it. Plugs and wires are less than a year old, and the cat is fairly new too.

    - Justin
    New Jersey F-Body Owners Association<br /><br />1991 Lumina 3.1 / 3spd Auto - hacked airbox, FFP dogbones - 17.4 @ 78.68<br /><br />1987 Camaro - 400sbc, Aluminum L98s, Comp XE 274, 750 DP, 3.23 posi, Dana 44 w/4.09s soon.

  14. #14

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    tap the gas at idle... almost stalls

    I was experiencing the same "hesitation when accelerating from a stop" problem that cutlass1991 described.

    My mechanic diagonosed the problem as aa weak fuel pump - it just wasn't putting out enough fuel pressure. A new fuel pump and the car is running normal again.

  15. #15
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    tap the gas at idle... almost stalls

    You know, I think kcac might have made an interesting point that we all over looked. A bad fuel pump would also explain why this problem comes and goes. As I read on that long drawn out post about fuel pumps and thermodynamics, maybe as the tempurature changes the pump gets weaker. This seems like it is worth looking into. The only question now is if changing the pump yourself is a bitch or not, and of course how much will it cost.
    So from here my plan of action will be to change the O2 sensor, and if that does nothing, look into the fuel pump. hopefully this will get solved.
    -Dan<br /><br />'91 Cutlass Supreme, 3.1L 76,050 miles<br />'97 Cutlass Supreme, 3100 152,500 miles

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