Manifold Gasket & Oxygen Sensor????

[ttyson]

What's the easiest way to check for a manifold gasket leak and also if an oxygen sensor was bad, shouldn't you get a code for this? I have a 1992 s-10 Blazer 4.3 vortec - v-6.

[JWhite8055]

an old trick is to use a can of starting fluid.

Start the motor and spray sparingly around the edges of the intake manifold, if you find a spot where the RMP increases when you spray, you've found a leak!

The O2 sensor sould set a code if it's bad.

[Rowlin]

the starting fluid works but brake cleans works better on finding a leaking intake

but if its a bad o2 i wont always set a code off in the computer
the o2 can become lazy, this will cause no code but what it does is switch at a extrmely low speed but switch enough no to cause trouble u will notice bad gas milage or good depending where it get stuck the most

[JWhite8055]

No doubt brake cleaner works, as would many higly combustable products, but most of them have no lubricant in it, starting fluid (most brands anyhow) does.

[mikeyk22]

use carb and choke cleaner