88 Blazer, TBI 4.3. Most of the time it runs absolutely great. Great throttle response, plenty of power, etc. Occasionally though, it feels low on power, sluggish, like something is holding it back. Throttle is much less responsive. I have to put it 3/4 of the way to the floor to get it to downshift, even going up a decent hill.
I don’t know how or if it’s related, but when it’s acting like this, the brakes also seem less responsive. Pedal sinks a bit lower than it should, and is very spongy.
There doesn’t seem to be any pattern to the problem. I can go a couple weeks without a problem, or it could happen three days in a row. Run time/heat kinda seems to have an impact, as it happens more frequently during longer drives (1/2 hr or more), but not always. Sometimes it happens right away on a cold start. But once it acts up, it’ll stay that way the rest of the trip. I’ve taken a few quick looks under the hood and haven’t seen anything out of place. I haven’t done any pinpoint inspections/testing because it never acts up when I have the opportunity to look at it. It’s been doing this as long as I’ve owned it. Never been bad enough for me to really worry about getting stranded somewhere, but I’d like to figure it out. Thanks for any and all responses.
I don’t know how or if it’s related, but when it’s acting like this, the brakes also seem less responsive. Pedal sinks a bit lower than it should, and is very spongy.
There doesn’t seem to be any pattern to the problem. I can go a couple weeks without a problem, or it could happen three days in a row. Run time/heat kinda seems to have an impact, as it happens more frequently during longer drives (1/2 hr or more), but not always. Sometimes it happens right away on a cold start. But once it acts up, it’ll stay that way the rest of the trip. I’ve taken a few quick looks under the hood and haven’t seen anything out of place. I haven’t done any pinpoint inspections/testing because it never acts up when I have the opportunity to look at it. It’s been doing this as long as I’ve owned it. Never been bad enough for me to really worry about getting stranded somewhere, but I’d like to figure it out. Thanks for any and all responses.
