Question about 1999 BMW 328 Series

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Engine surging Engine has begun to surge 200-300 RPM at idle, never done it in the past, If I rev the motor it stops.

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Look for the holes in air intake tube.at the bend

Posted on Oct 04, 2008

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Van idles ok, but when I raise rpm to around 1500 it starts surging real fast. Ant ideas


Stuck idle air control motor. Clean it and the throttle body. You might want to replace the air and fuel filters also. No year make and model.

Mar 18, 2016 | Cars & Trucks

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2000 Suzuki Esteem 1.8L.. I went to start my motor & turned it off right before started. I heard some kind of backfire. Then I started it and it's been idling high, the surging. Please help!!


scan it yet, a FULL OBD2 scan? why not?if not.
now is the time...


the 1.8L J18 engine, same as the older Sidekick sports used.
same engine , know it I do.
its the precursor to the J20, (j18 is under-stroked, j20 with many of the same parts. inside)
the back fire means explosion sound to rear end of tail pipe?
yes, that is rich raw fuel in the muffler. plus Air.
if there are exhaust cracks and then engine goes rich this can happen( a double failure)
if how ever BACK means, back to the Air cleaner, then that be different reasons, (timing)


engine now starts.?>
engine runs.? has full power, car drives ok.?
JUST?
SURGE,. you never said.

does engine get hot? 180F or more and holds (y/n)
ever get a full tuneup this decade,
most dont so i tell you, bad spark causes, misfire and raw fuel is wasted to the exhaust and sure can go boom.

surging usually means the ISC can not control idle
so it hunts, (a suzuki software engine on all 90s engines)
PCM errors, inside it. (dangerous too)
a modern car, if idle goes too high the ecu commands the ISC closed
and holds it there solid, (safe way , no hunting allowed now)]
so if this car surges, it's , lean engine.

some think flooding is surging.
and this is usually below 800 rpm,
almost stalls, then corrects, seems like a surge.

next time post rpm range of surge.?????

do not drive a surging engine, do not be like Toyota drivers. (over 800 rpm hot)

surge from 400 -800 rpm is class 1 surge.
surge from 800 to say 2000 RPM is class2, and very dangerous to some folks, (key off, get car fixed, tow it)

The ECU controls idle speeds. (hard coded servo controls)

Mar 18, 2016 | Suzuki Cars & Trucks

2 Answers

While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?


old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.

seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.


stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
and post all those DTC errors. P0700? and more.

Jan 24, 2016 | 1995 Jeep Grand Cherokee

1 Answer

Idle surges 1996 Nissan Maxima from 800 to 1800 rpm


could be a dirty throttle body or the idle control motor

Mar 24, 2012 | 1996 Nissan Maxima

1 Answer

Engine idle sits at 1200 revs , and surges past 2000 revs when stopping car with brakes


i think there's an air leak in your brake booster. Just try to disconnect the vacuum hose going to your brake booster and plugged it use a vise grip to press it. The idle shld go down if there's an air leak

Feb 09, 2010 | 2004 Ford Focus

2 Answers

22r carb dumping fuel at 2500 rpm will not pass smog.Was rebuilt and is in smog specs. at idle.


Fill the tank up but do not top off.

Ran the trunk for 15-20 minutes on the highway and recheck the fuel surge condition at 2500 rpm.

If it stop surging then you has a weak fuel pump.

Change the fuel filter will also help.

Also check the fast idle setting.
==
If everything checks out then set a smog check appointment in the EARLY MORNING.

Jul 05, 2009 | 1986 Toyota Pickup 4WD

1 Answer

2001 Toyota Celica GT RPM surging at Idle


Certainly sounds like the o2 sensors have become contaminated and are not acting as fast as they used to , or are supposed to.

Apr 24, 2009 | 2001 Toyota Celica

2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

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