Surging at crusing highway speeds

THEALLDEBRA

MEMBER
CHEVROLET LUMINA

I Have a 1992 Chevy Lumina 3.1 140000 miles. While driving at speeds above 50 on the highway after awhile, sometimes, not all the time my car seems to start to surge. We have done a tune up Changed several censors and modules to try to fix the problem. It seems though the more we change the worse the problem gets. On one occasion the car even lost 50% of its power, and after letting it sit over night its power was restored but still got the surging. I am stumped to what the problem is. Please help.

Tuesday, April 3rd, 2007 AT 8:07 PM

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

What sensors and modules was changed?

Try checking the fuel pressure and pressure regulator-might be the fuel pump fading away

Check for a clogged exhaust system.

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Wednesday, April 4th, 2007 AT 4:21 PM

TBDK

MEMBER
24 POSTS

I have a 1994 lumina that did the same thing. After I put new plugs and wires in it stopped. Now as you said you tuned it here is what else I would check.
1. Make sure none of your wires got melted by the motor for it to fire there.
2. Check the throttle position sensor(TPS).
3. Make sure your distributor is on snuggly and all wires are connected firmly. You'd be surprised how often a problem like this is solved by simply tightening a connection.
4. As previously posted check and make sure your fuel pump is working properly. Connected good.
5. Check for a blown fuse.
6. Have you're control module checked. It is located under the distributor cap.(Not likely but you never know.)
7. Have your alternator checked. A loss of power could indicate a weakening alternator. Also check connections. If the are loose then at faster speeds the could lose connection and drain power. They can reconnect by sitting over time.
I hope this helps in even the slightest way. If not, sorry for wasting your time.

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Tuesday, June 5th, 2007 AT 2:31 PM