Engine missing

RONALD FRANKLIN

MEMBER
1999 OLDSMOBILE 88
3.8L
V6
2WD
AUTOMATIC
114,000 MILES

Ran car low on gas. Acts like it is hitting on five cylinders instead of six. Could it be the fuel pump or filter? If so where are they located? Thanks for your help. Other suggestions would be greatly appreciated. This car sat for about a year, but after a tune-up it ran great for about six months.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

In the tune up did you replace the spark plug wires? If not I would suggest AC/Delco wires you can get them from Amazon.

Please let us know what happens.

Cheers, Ken

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Thursday, August 24th, 2017 AT 11:38 AM

RONALD FRANKLIN

MEMBER
14 POSTS

When I did the tune-up I replaced wires, plugs, coils. Seems to run well when engine is cool, but starts missing after a few minutes. I had it checked at a local auto parts store. The machine said it was caused by random misfire. Any suggestions? Thanks

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Thursday, August 24th, 2017 AT 2:25 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Nice work, a random misfire can be caused by mainly two things, first is the MAF sensor is off causing the system to run lean creating a random misfire. When this sensor goes out it may or may not trigger a code.

Here is a guide to help you get started.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

The next is a vacuum leak, here is a guide to help you test to confirm and repair

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please let us know what happens.

Cheers, Ken

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