2000 Oldsmobile Silhouette rough engine during acceleration

OLDOLDS

MEMBER
2000 OLDSMOBILE SILHOUETTE
6 CYL
2WD
AUTOMATIC
240,000 MILES

Folks;

My engine has developed a rough choking spitting performance during acceleration. Gas mileage is fine (about 21 mpg avg.). Idle is fine, and cruising is fine (highway and city). The problem developed first at 40-50 mph when the over-drive gear kicked in, and now it is pretty much every gear and speed during acceleration.

History
- 240,000 miles (60,000 since this "salvage" engine)
- rebuilt transmission (12K mis, 10 months ago)
- Just got the head gasket replace (leaking but not over heating).
- Good vehicle, want to keep it running.

Thanks and be well
Steve

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Do you have a check engine light?

Engine hesitating could be caused by the following:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

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Thursday, April 9th, 2009 AT 8:25 AM

OLDOLDS

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2 POSTS

Yes - the check engine light comes on and blinks, then goes off (eventually).

I had the Goodyear shop diagnose it (I've had good service in the passed). They had previously replaced the head gasket (no issue with that), but right after that, this rough engine problem developed. They said I needed to replace the catalytic converter ($900)?! I am not convinced this could be the problem.

In the passed I have had a similar issue, but the Mass Fuel Sensor was the problem - now that you mensioned it I remember.

Your thoughts?

Florida Dolphin fish (Mahi Mahi) I caught it - "friend" photoshopped it for a work presentation ...

Thanks and be well.
Steve

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Thursday, April 9th, 2009 AT 8:49 AM

RASMATAZ

MECHANIC
75,992 POSTS

Yes - the check engine light comes on and blinks, then goes off (eventually).

Get the computer scanned for OBD2 code/s and if any comeback with it

Also follow up on the things I've mentioned earlier

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Thursday, April 9th, 2009 AT 8:55 AM

DONALDKIMBERLYR

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3 POSTS

My van is doing the exact same thing just started Aug. 4, 2009. What did you do to fix your problem? If you don't mind me asking. Thanks for your help.

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Friday, August 28th, 2009 AT 8:16 PM

CHRISINTAMPA1

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2 POSTS

My van is doing the exact same thing! I have taken it to several places and have had the catalitic converter replaced, the intake manifold, plugs, wires, pvc, no one can figure out the problem because it doesn't always do it. I drive 30 miles to work one way and I need a dependable vehicle. Have you found out what the problem is yet?