Question about 1998 Oldsmobile 88

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I needto to change the spark plugs

The was running very rough, engine was missing on idle.and the check engine light came on. it turned out to be a coil sensor in the #1 piston. this was replaced. now the car is idling rough again and the engine light is blinking on and off now

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  • Expert
  • 53 Answers

When did you change your plug wires last?

Posted on Dec 30, 2012

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Posted on Jan 02, 2017

eitan
  • 291 Answers

SOURCE: missfire

Locate you computer (right front kick panel) and tap on it with a pen while the car idles... Also flex it back and forth with your hands to see if the car runs rough or quits... You may need a new one.

Posted on May 15, 2008

  • 422 Answers

SOURCE: I have a 1999 oldsmobile

fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

Posted on Aug 26, 2008

  • 321 Answers

SOURCE: 99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Posted on Dec 04, 2008

  • 422 Answers

SOURCE: 93 oldsmobile quad 4 2.3 one piston is not working wet spark plug

you probably broke a piston ring in the #4 piston have a compression check done

Posted on Mar 27, 2009

  • 1 Answer

SOURCE: Car stumbles,hesitates,loses power on Hwy, randomly

Did you check earth connection of electric system?

Posted on May 10, 2009

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2 Answers

Check engine light on engine acts as if missing new plugs wires and #5 spark pack missing again 6cyl 4x4 3.4 185000 miles


was it running this way before you changed the plugs? just a shot in the dark here possibly a defective spark plug, rare but not impossible. if it was running fine before changing them. Other wise I would take it to autozone and pull codes if it is P0350 #5 misfire we would use the process fuel, fire and compression. is there any engine coolant around any cylinders? Have you checked the coil packs? could be a bad coil pack. if no evidence of fluid around them proceeded to check for spark, fuel then compression. post back results or new post with more deductions. iis it no spark no fuel or bad compression.

Dec 25, 2014 | 1996 Toyota T100

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1994 Lincoln Towncar is idling and running rough. Have changed the plugs and wires recently and no change. Compression is good..93,000 miles on it. New Air idle pump also. Do you have any suggestions? ...


Is the check engine light on ?
Fuel pressure ok ?
If it has a steady miss on one or more cylinders you'll need to figure out which cylinders and what is missing = spark-fuel-compresson.

Sep 02, 2013 | 1991 Lincoln Town Car

1 Answer

Rough idle, rough in drive


Is the check engine light on ?
Have you checked the computer for trouble codes ?
You could have one bad spark plug even with only 30k on it.
Problem could also be a dirty injector.

Feb 18, 2013 | 1999 Ford F150 Regular Cab

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My 2001 oldsmobile aurora is misfiring and sputtering after i replaced the spark plugs?


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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This will help.

Thanks.

Feb 17, 2012 | 2001 Oldsmobile Aurora

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1992 pontiac grand am no acceleration, a rough idle (engine miss)


Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.

Apr 22, 2010 | 1992 Pontiac Grand Am

1 Answer

2007 G5 Rough running (missing). Doesn't die.


Hi shoemaker.
Fuel filter issues show up in high demand fuel needs such as passing or going up hills. Rarely do they cause rough idle problems.
Is the check engine light on or flashing? A flashing light indicates engine misfire and should be repaired as soon as possible.
So you could have a vacuum leak, a stuck EGR valve, bad ignition coil, worn spark plug, and many other items.
If you don't have a check engine light and haven't done a tune up do one to eliminate a few items and see if that smooths it out.
If you have further questions ask me and I will check and answer you.

KL

Jan 04, 2010 | 2007 Pontiac G5 Gt Coupe

1 Answer

Engine runs rough in gear.


Okay disconnect battery for 3 min to reset engine light to turn off! change wire #2 to #3, Swap them then start it. if misfire happens again if your fault codes goes from po302 to po303 then your ignition wires should be changed!!! if it is the same the that side of coil might be at your point of interest to change but I think spark wires might do it!!!! spark plugs should be the same time!!!! I think this will help??

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