Question about 1998 Oldsmobile Silhouette

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What would cause an 1998 silhouette engine to suddenly run rough and miss?

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Fuel starvation, ,filter chocked,

Posted on Jul 07, 2010

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Posted on Jan 02, 2017

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2 Answers

Why does my 1998 gmc jimmy rpm drop so low when its warm causing a miss in the engine


The truck ECM computer controls the idle speed based on a number of engine parameters. Idle drops to a minimum preset level when engine coolant reaches normal operating range and the engine goes into closed loop control. This idle is typically set at around 575 rpm, and cannot be changed without reprogramming the ECM. The miss is not caused by the idle speed - unless the engine is tuned properly and has not lost compression, this idle speed can result in a rough running engine at idle (typical with older 4.3L Vortec engines). Best bet is to get a complete tuneup which will include checking the O2 sensors, catalytic converter and cleaning the IAC valve and throttle body.

May 20, 2014 | 1998 GMC Jimmy

1 Answer

1998 Oldsmobile Silhouette overheating


Is it leaking antifreeze underneath the engine at all when it sits overnight? If so I would say the water pump is shot. If it isn't leaking, it could still be the water pump but it might(hopefully) just need a new thermostat. And driving it when it's hot like that to the point where it starts to run rough means you run it too much like that and your engine will blow up and there is probably already damage. So check it out before driving it to much more.

Dec 02, 2013 | 1998 Oldsmobile Silhouette

2 Answers

Spark plug and ignition coil problems.... plugged cat?


romove poping plug start engine if thier is major air pressure coming outyou have ahole in your piston replace piston overhaule kitand new piston possible thred damage on head,replace cat,and get a dog:) good luck.

Feb 22, 2013 | 1998 Ford Expedition

1 Answer

I have a 1995 Mercedes Benz SL 500 that runs rough when started after sitting for several days.


hi Jhlightcap.

The Common Problem: Rough Running Engine

A properly-operating engine should run smoothly and without excess noise. If your engine starts operating in a manner that gives you the perception of "running rough", it is likely due to a handful of common causes. A mechanic would investigate these common causes first in order to rule out a simple explanation for the engine's unsatisfactory operation.
The common causes for rough running in an engine are:
  • Engine miss
  • Vacuum leak
  • Dirty fuel injectors
  • Carburetor problems
  • EGR valve
  • Ignition coil
  • Spark plug wires
  • have a look at this link.
Rough Running Engine James on Engines 2

Dec 10, 2017 | Cars & Trucks

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How do i know when my spark plugs are bad


Bad plugs would cause a miss and the engine would run rough.
Your check engine light would also be on and you would have codes for the missfires.

Jan 10, 2013 | 1998 Oldsmobile Eighty Eight

1 Answer

Engine runs rough at 2500 rpms


sounds like you have a missing cylinder could be caused by a spark plug or wire or even a coil pack if your car has a coil pack if not then it could be your distributor cap, it could have a crack getting moisture in it causing the rough idle. hope this helped

Jan 03, 2011 | 1998 Honda Civic

1 Answer

1998 WINDSTAR CSERVICE ENGINE SOON LIGHT IS ON


it's not likely a bad o2 sensor would cause it to run rough, but the catylitic converter, which is what the o2 sensor reads the flow of, would cause the car to idle and run rough.If you take it to an auto parts store to have a diagnostic test ran on it( most major parts stores will do this for free), thecodes it gets would help pin point it alot better.

Jan 20, 2010 | 1998 Ford Windstar

1 Answer

Runs rough like missing


check the fuel pressure when it is idling for about the time it takes to die see if it drops.most likely gonna need a fuel pump

Jun 22, 2009 | 1999 Oldsmobile Silhouette

2 Answers

1998 Sunfire rough running (missfire) common causes?


if check engine light comes on may be crank position sensor or ur injectors r clogged try some chevron injector cleanor it helps when injectors clogged makes it run smoother

Jun 16, 2008 | 2003 Pontiac Sunfire

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