Question about 2000 Chevrolet Impala

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3800 engine My impala surges and will stall only when the engine is hot. When I am idling is when it will stall, if I keep it up over 1000rpms it doesn't stall. It almost sounds like a back fire when it idles for a while. First time it started I was idling at a light and I thought someone hit me from behind. I went to Automart they hooked it up to there hand held scanner and the error code came up P0102 MAF. I replaced it and yet still I have the same problem. Any suggestions? I love my car, but last night is stalled before I came to a complete stop, and the car behind me almost hit me, I need my car to get back and forth to work no bus service here in the early mornings.

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Sounds like you may have a bad vacuum leak. On the 3800, this is commonly caused by a bad upper intake plenum. Check for vacuum leaks elsewhere first though. (i.e. brake booster, hoses, etc.).

Posted on Oct 18, 2008

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I have a 2006 Impala the engine is surging at idle and when I driving


Check the vacuum hoses for a leak.

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3800 series2 flutters, missfires with powerloss when acceleration is apllied but idles fine,surges when warm and seems to run normal when very light on throttle. eventually gains and maintains highway


Have the intake gaskets been replaced? you could be getting a little coolant in the cylinder. these are a SUPER common problem on 3.8 series 2 engines

Mar 31, 2014 | 2000 Chevrolet Impala

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When I start my odyssey it starts surging. I found a small rubber hose on the right side of the engine, but don't know where the other end of the hose goes....Help


WHAT COUNTY???????????????????????????????????
hot engine, cold or both?/// a key question
WHAT ENGINE: ( usa list , ONLY)
2.2 L F22B I4
2.2 L F22B6 I4
2.3 L F23A I4 2.3 L F23A7 I4
the fsm covers this. hose thing.... all hose can be followed,
unless its axle vents on 4wd cars. (they go no where, special)
is surging the only symtom.?
no engine stalls.?
lack of power in any gear or hills.
no misfiring?
no flooding.?
starts easy/?

ok what is surge, that it really is idle controls bad or out of comtrol
1: idle controls bad. (isc dead?)
2: or engine is running way too lean, and ISC cant keep a grip on idle.

easy huh?
and #3 misfiring so bad the idle controls fail.
are all fuses good?
is the CEL lamp glowing , then goes out running engine.
no , the scan it. or do the flash DTC codes trick.

a good tech ,first finds out if the engine holds closed loop status
hot. at idle, if not, he fixes that first.
as he/she knows that idle is the last thing to work right, in EFI.

one other way to get surge is air leaks (aka. vacuum leaks)
if the engine (unsaid option) is MAP based, it will race fast
with any vacuum leak, and it dont take much of a leak
to make the ISC idle controller go nuts.

so repost , hot/cold both questions
and actual RPM numbers. we need numbers
is the dash Tachometer missing. ????
and what engines in car.

all lean engines surge.
all ISC systems can surge if out of control , not all do this. just 1/2
if the ISC surges, it means its trying hard to gain back control.
this is called a software servo loop.
The ECU is programmed to hold rpm near say 800 RPM hot.
and is very digressive in that role.
I have a 91 car that will surge, with any vacuum leaks.
(by design) depends on which engine.

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1 Answer

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define properly? (too high/low. or surges or/)?
hot or cold engine or both?
idle is last thing to work,
all else must be good.
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all gross misfire causes, idle to fall and los e control
same with lean or flooding. lost control
the ECU/pcm works very hard to keep idle right using its slave ISC.
did you connect a scan tool and scan for errors?

if the scan tool shows AFR perfect in closed loop at idle hot.
then the ISC is stuck.
AFR is perfect air fuel ratio mixture that all EFI do,.

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Increase then decrease idle when engine is cold especially


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RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
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needs a tune up bad, see the list in the operator guide.
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location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
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2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
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Battery installed backwards at store


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