Question about 1994 Chevrolet Beretta

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Why does my engine surge at 50mph and above and then stops surging if I accerate hard?

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Idk im having the exact same problem with my 2002 blazer :(

Posted on Sep 29, 2010

  • woodtick465 Oct 02, 2010

    i RELACED T HE NEW A.C. BRAND SPARK PLUGS WITH BOSCH PLATINUM PLUS THIS CURED MY PROBLEM.

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My 2010 jeep patriot with a 2.4 is surging when u accelerate from a stop.


Could be any one of a number of sensors for engine control . Mass air flow sensor , TPS - throttle position sensor, or APP- accerator pedal position sensor etc... Without testing an looking at scan tool data ,who could say for sure . How does the vehicle idle ? how does the vehicle run at cruise speeds ? Does the vehicle have electronic throttle control ? 2010 - i'm sure it probably does . Is the check engine light lit ? Your best bet would be to take it to a qualified repair shop.

May 31, 2016 | 2010 Jeep Patriot 2.4

1 Answer

Throttle surge at idol


surge, great post, what engine displacement.
open hood (my answers are USA only) look up, see big white
sticker that is the engine vacuum and type engine sticker)
surge hot or cold? engine.
if it surges hot, that means :
1: ISC system out of control , it job is to stop surge and 5 more things.
2: the engine is way lean and cause ISC to loose control

just 2 reasons, and can be 50 things. wrong.
is the CEL lamp out running> if not, pull the DTC codes and post them. (all)
as a mech ,we find out which it is.
(i make sure my engine can hold closed loop at idle , if not and lean it will surge. (may)
we make sure the ISC works ok (not sticking, clean it)
and then test to see , that if by my forcing it closed, by hand (ask)
i can get way below 800 RPM. most do 500 but 600 is ok.
if rpm stays above 800 closed, that means you have huge
vacuum leak or TV blackage (too thight throttle cable?)

finding vacuum leaks can be horrific, task .
there are many tricks (and tests) to do this, ask.

see that logic above, If I the mech, can not drop rpm below 800
by hand, then no ISC on earth can. not now or ever.
and proves the induction has huge air leaks
or some dolt set the spark timing 20 degrees advanced.
see it.
so as always , a tuneup is first, then as always , i always check timing,and for proper advance rates.
advances engines at idle race way too fast and the iSC will just go NUTS.

ISC = Idle speed controller , that valve that has wires.
the IAC is a thermal device and no wires and it too can stick open
when the IAC sticks open the ISC goes , yes, nuts,
nuts can be surge (ECU is hunting it)
or just racing way too fast hot, say 1500 rpm.
a slow RPm can be a stuck open EGR (50k service point)
lean will cause too low.
too rich , misfires and too low
the ISC is the last thing to work right, all else must be good.

what does your CEL lamp do?

PS: most cars, if the ECU/PCM enters Limphome, it cuts all idle controls. again, the CEL lamp. glowing while running.../????

Nov 28, 2013 | 1994 Honda Civic Del Sol

1 Answer

2005 suzuki verona engine surges at 45-50mph when the engine is cold after it heats up it goes away?


Plz check engine coolant temperature sending unit that feeds the computer. (Not the one that controls gauge on dash).

Nov 14, 2013 | 2005 Suzuki Verona EX

1 Answer

1998 gmc sonoma 2.2l intermittent engine surge


Make a gasket up from a coca cola can and block off the EGR valve and see what happens

Mar 27, 2013 | 1996 GMC Sonoma

1 Answer

CAR IS SURGING ON SMOG MACHINE AT 50MPH


O2 sensor is likely the cause, but could be a symptom of your cat converter too. One time I simply disconnected my battery for a few seconds and then...here's the trick...drove consistintely at 50mph for 15-20 mins (on long highway), then pulled straight in for the test with as little 'stop and go' as possible. Of course, this is not true of all models, but it worked on my '97 chevy truck. good luck

May 01, 2012 | 1995 Mitsubishi Galant

1 Answer

Check engine light is on. No power, struggle to to obtain 50mph. Power brake and engine surges dramaticly @2500 rpm


Sounds like a fuel system problem, but it's nearly impossible to tell without a computer scan. Have a competent mechanic run a scan and check the vehicle's fuel pressure.

Bill B

Apr 15, 2010 | 2006 Dodge Stratus

1 Answer

My cobalt's engine is surging from 500 to 800 rpms when I come to a stop What's the problem?


SURGING COULD BE FAULTY FUEL PUMP OR IDLE SPEED CONTROL GOING BAD OR TRASMISSION TORQUE CONVERTER WILL CAUSE ENGINE TO SURGE WHILE ITS UNLOCKING AND LOCKING UP DUE TO A FAULTY FAULTY TORQUE CONVERTER CLUTCH SOLENOID.

Feb 28, 2010 | 2005 Chevrolet Cobalt

1 Answer

Surge in idle when brakes applied or after driving..


block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

Jun 14, 2009 | 1992 Nissan 300ZX

1 Answer

Engine surges at rpm over 1500


Look for a vacuum leak (lines and intake), Is the engine light on, were any codes present? A faulty EGR or IAC could cause the problem too. Check the throttle cable for any restrictions.

May 27, 2009 | 1996 Chevrolet Cavalier

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