My '92 Lumina 3.1 with 163K miles has an intermittant "Service Engine Soon" light that comes on and off every few minutes while driving. The codes come up MAP sensor and knock sensor...what gives?

Asked by Aug 08, 2014 at 02:46 PM about the 1992 Chevrolet Lumina 2 Dr STD Coupe

Question type: Maintenance & Repair

Before I start replacing expensive sensors, I'd like tp know why my Lumina idiot light comes on and after a few minutes turns off while driving. It feels like for the few minutes it is on the engine does run rougher but then goes back to normal when the light goes off.
Also, the engine drips oil and leaves stains everywhere I park it...is there any effective aftermarket stuff I can add to the motot oil to at least slow down the drips? I thiink it's the rear main seal that's worn.

1 Answer

455

Ideally you should locate the source of the drip. If you have a leaky gasket somewhere then you should remove it, clean the surface, verify that the metal has not been scored or warped, place a new gasket and sealant, and torque to specifications. If the leak is around the valve covers or the oil pan then the repair is fairly easy. If the leak is around the heads or manifold then the work is a bit more tedious and more gaskets are needed. You can easily test a knock sensor using an ohm meter. You should verify that the vacuum line on the MAP does not have a pin hole or leak anywhere. You can test the MAP with an ohm meter as well. If the vacuum line is in question then you can rent a small pump to apply pressure at the vacuum hose connection for testing purposes.

Your Answer

Chevrolet Lumina Experts

  • #1
    90V6RedHotLuminaEuro
    Reputation
    1,190
  • #2
    John Saffrahn
    Reputation
    1,090
  • #3
    11jonny11
    Reputation
    930
View All

Related Models For Sale

Used Chevrolet Camaro
442 Great Deals out of 31,892 listings starting at $1,450
Used Honda Accord
1,120 Great Deals out of 74,857 listings starting at $1,100
Used Toyota Camry
1,126 Great Deals out of 87,386 listings starting at $995
Used Chevrolet Blazer
7 Great Deals out of 922 listings starting at $950
Used Chevrolet Cavalier
803 listings starting at $1,695
Used Toyota Corolla
1,006 Great Deals out of 67,330 listings starting at $1,699
Used Nissan Sentra
827 Great Deals out of 51,685 listings starting at $2,200
Used Buick LeSabre
5 Great Deals out of 1,670 listings starting at $899

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.