Question about 1997 Buick Skylark

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Wheb starting engine sounds like running out of fuel and back fires. When it does start engine idle surges very bad for about 1 min. this does the same thing several times before the car starts. Replaced fuel pump and filter that was not the problem.

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  • grannysan57 Jan 31, 2010

    V-6 3100 FSI

  • grannysan57 Jan 31, 2010

    The engine is a V6 3100 Fsi

  • mike watson
    mike watson May 11, 2010

    I would check the coolant temp sensor for the emisions system . It my be the same sensor for the light or gauge.which engine does the car have?



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While standing in front of the car the air intake tube from the air filter should be on the drivers side of the car.Follow it to where it attaches to the engine on the mass air flow sensor.Now look a bit below there and to your left with a flsh light and you shoud see a 2 wire plug plugged into a sensor that resembles a spark plug.The sensor may seem a little bit further in than you can reach with just your hand but you should be able to see it.If you get an angled pick or somthinig like it you should be able to unplug it.Get a 7/8 or 13/16 sensor socket with an extension and you should be able to remove the sensor and replace it with a new one.most new sensors come with thread sealer but if it dosen't put some thread sealer on it(NOT THREAD LOCKER)and install new sensor and plug it in with a pair of long needle nose pliers being carefull not to damage the plug in with the pliers.Note how far the old one is screwed in and install the new one the same unless it doesn't want to screw in any further.Becarfull to not strip the threads or break it.

Posted on Jan 31, 2010


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2005 silverado 4.3 liter runs for 5 min then dies starts back up runs then dies

Sounds like a clogged fuel filter or bad fuel pump. If the fuel flow is restricted, then engine will start and idle but at higher speeds it will starve.

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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.?
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)

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Got 1994 honda accord dx 5sp, problem when try to start engine for first time of the day have to wait about 5 min before check engine light will go off and fire up the fuel pump. if i let car idle or run...

sure can be lots of things, but in this case only 3.
1-bad engine, (lost compression , warm or hot.) 150psi is min.
2-bad spark, the spark parts can in fact fail for hot soak,
the parts can get to a specific range of temperatures and fail.
this is very common type failure, on all EFI cars. (fancy spark)
3- last is #3 bad fueling. (too much or too little)?

this works on all cars, that RUN most the time, but not today.

why not troubleshoot it , when it fails. that is the #1 best time to
diagnose any machine, can't diagnose a working machine.
first off , i have no idea what this means.
"wait about 5 min before check engine light will go off ."
the CEL must com on , key on,
if not the ECU bad or you lost 12vdc power to the ECU. (loose fuse?)
then you start the car, my guess, is the 300rpm CEL rules is fooling you, most cars the CEL goes out at 300 rpm (even cranking as the ECU thinks the car is started... its kinda dumb.
after the engine starts, the CEL MUST go out,
if the CEL sticks on, you need to pull the DTCs. scan it.
on this car it has a jumper plug to do the scan. (OBD1 old car)
so when the car dont start
you pop the hood, and pull a new spark plug out of right picket.
and do the spark test, (classic for 100 years)
is the spark good,? yes, must be fuel if ,not , spark is bad
this takes me 2 min flat, ready at all times, if parked. and stalled.
so you have good spark. i then try all 4 cylinders. good to all 4?
yes, good, no , bad dizzy
good spark
it must be fueling failure.
1: pull #1 spark plug(any) is it wet with fuel , its flooded.
2: same is it dry, lost all fueling.

once you get here, we know what part of the system is failing.
and for sure if compression x4 is 150PSI on all 4 hot, and WOT.

btw 2, the operators guide shows how to start a flooded engines.
WOT cranking, all EFI cars, for that matter.

fsm pages,

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