92 S10 Blazer losing power

Quit buying CHEAP GASOLINE

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Is it hot outside when it is doing it and at what power setting and did you install the correct plugs? (Take a few out and see how they look)

Catalytic converter plugged?

RJ in WV

I noticed with my 92 S10 that when it is above 90 outside I go from 15mpg to

18mpg. What the heck gives with that? Air to fuel mixture or someth>>I did a full tune up in April, electronic pick up, distributor, cap, >>plugs

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Second that,it happened to me after replacing CPI unit.

192,000 miles on a 1989 4.3 s-10 4X4 With the ORIGINAL OXYGEN SENSOR and it gets 27 mpg HWY 23 mpg city . I use CITCO GAS .... If I use SUNOCO or SPEEDWAY it Drops to HALF the milage .

Yes I have NEVER changed that Sensor. ONE owner Truck.

Just a possibility here

Try removing the dist cap and check for any movement on the dist shaft... Ended up replacing my distributor (91-S10) as the bushing inside wore out-of-round

You Shud have already Replaced at least ONE TIMING chain By NOW !

LS wrote:

Still on the original time bomb, er timing chain.

Ever since I replaced the intake manifold gasket it has a ting in cylinder #1. I think it's timing. I need to get the chain done and maybe a rebuilt distributor. I imagine it's pretty sloppy.

LS

GM 4.3 V6 & V8 timing chains tend to last well past 200,000 miles. Caddilacs and Buick V6's are known more for needing timing chains replaced. Most 4.3V6 and V8 Chevy owners only replace a timing chain if:

1. It Fails. 2. They are replacing the Cam. 3. Rebuilding the motor. Charles

My '91 (TBI) does the same thing except that mine goes from 11.5 up to 14.5 mpg. I'm thinking I need a warmer thermostat than my current one.

I noticed my temp never changes.

LS

Ah, but what temp does it run at?

It is definitely NOT the catalitic converter, before I purchased it the converter had been punched out.

I have been purchasing gas from the same place for over a year, since I purchased the blazer and they've been using the same supplier. I did have them check it right in front of me to see if there was water in the fuel and there was not.

Around 180 or 190. I have a 180 stat in it with a Hypertech chip.

We've changed the fuel filter, and took off the in fuel line to the throttle body, it is getting plenty of fuel but it still acts like it is starving for something. Would the O2 sensor be causing this? I've heard it is possible for a catalitic converter to get plugged again even after it was punched out, is this a possible cause?

I wouldn't think the catalytic converter could get plugged. The O2 sensor caused mine to run pretty bad but that was 200,000 miles ago. :) Still running strong but getting bad mileage. I wonder if I need to go back to a

190 degree stat and replace my O2 sensor.