85 S10 2.8 Blazer Hesitation

[tazfamily]

I Need Help! I Have Changed Plugs,wires ,cap ,rotor,air And Fuel Filter.what Else Can I Do

[rbuck]

Give more detail when does it hesatate

[tazfamily]

When I Give Her Some Gas It Spits And Sputters.then It Catches Up.

[BlazerLT]

Set your timing and install a new PCV valve.

[biv343]

PCV Valve?

Since it's a carbureted model, I'd think more along the lines of checking the accelerator pump - sounds like it's not getting enough gas off the line.

[BlazerLT]

Originally Posted by biv343

PCV Valve?

Since it's a carbureted model, I'd think more along the lines of checking the accelerator pump - sounds like it's not getting enough gas off the line.

PCV valve is a maintanence thing.

The Timgin should be checked seeing it could be retarded which could be allowing the engine to run too rich which would cause the studdering.

[biv343]

Originally Posted by BlazerLT

PCV valve is a maintanence thing.

The Timgin should be checked seeing it could be retarded which could be allowing the engine to run too rich which would cause the studdering.

I wondered where you were going with the PCV valve thing. Not a bad idea to change it, but I doubt it would cause the symptoms he described.

You could be onto something with the timing. The timing generally won't change on it's own (unless some pretty severe timing chain slack is going on). It could be advance related, but I don't even remember if those distributors have advance weights or not. It's been too long since I've dug into one of those 2.8 L engines.

Then again, on a 20 year old vehicle, it could be a number of things, such as a vacuum leak, dying carburetor, etc. My 85 S-10 has started dropping it's fair share of parts over the past few years, not due to high mileage, just old age.

[BlazerLT]

Timing can go out of adjustment over time.

The PCV valve can cause a idle and driveability problem if it is stuck open and not regulating the PCV gas properly.