Chevy Trailblazer has rough idle and poor fuel economy (fuel filter change) 

Fuel filter (every 30K) Then Throttle body cleaning, ignition coils, spark plugs every 100K even if you think you don't need it, do it.

very nice, got the location and the filter change.

My 2003 Trl blzr bougt it new changed plugs ones never changed fuel filter. All exept one coil have i changed. But now 2023 my trl blzr stalls at stops. But runs good on the road. Thanks for the video.

If you are still having this problem. Change the map sensor. I have a 2004 and I just changed my part. No I didn’t have a check engine light and the engine ran fine.

To prevent that high pressure fuel spray off, you can remove the FUEL pump relay in the engine fuse box, i think is relay 41, run the engine till it stalls, then when working below the truck, you can see a cap in one of the connectors, it is the fuel pressure relief valve, just put a pen or something so you can get out any remaining pressure , that way when you unhook the fuel lines, yo do not get that surprise fuel spit out.

@AllensShenanigansd Get Some CRC Sensor friendly map sensor cleaner and throttle body cleaner and clean the throttle body if you haven't already I bought my 2004 same color as yours for $600 Cleaned the throttle body put a hot battery in it and drove it home still daily is now it just rolled over 207k and still runnin like a top trailblazers are like a sore dick you can't beat em

thanks

Should've seen if it would've restarted to drop the fuel pressure even further & left the fuel cap off. There's around 50 psi on those lines. If you still have rotten mileage check the top of the tank. The metal barbs the fuel pump has are prone to rusting & pinholling. Since that pump sits in a depression, it's hard to see or even get a hand into. Scope works great tho. If you feel/see fuel there the tank needs to be dropped.

My 2004 BMW 325i only got 15 MPG since I bought it 5 years ago. I cleaned the MASS AIRFLOW SENSOR and I'm getting around 30+ now!!! (It never threw a fault code for anything. Including Oxygen Sensors.)

I replaced all six plugs and 4 coils. Car runs fine very stable but it randomly hesitates (like a cough) for split seconds ONLY ON IDLE. Any suggestion will be highly appreciated. No codes on OBD by the way.

Sign of clogged filter

Thanks for the video... Just one question... Was a engine light on?

Good video. Is it the same for a 2005?

why trailblazer get terrible gas mileage

I need to do that. Did it solve the problem? Runs better? Better mpg?

Did it help the mileage ? I know I need to change mine

I have a 2002 envoy and for the last year or so my gas mileage has gotten worse. But never sputtered or slowed down until 2 days ago I was on the open road at around 55 mph and all of a sudden it began sputtering and slowing down. I thought it was out of gas so I pulled over and shut it off. Someone brought a gas can and put a tiny bit of gas in it, I don't believenit was enough to make a difference because when I cranked it back up there was no hesitation in cranking. Normally when you run out of gas it takes a little bit of time for it to crank. I was about a mile from a gas station and it ran fine and I put 4 gallons in it. When I took off it ran well for about 5nmiles and began sputtering again and slowing down. I pulled over and sat for a few minutes and cranked it up again and it went 5 more miles and did the same thing. I did this for around 15 miles and managed to get it home. The fuel filter was replaced and it seemed to be fine until the next day I cranked it up and drive it around 10 miles and it did the same thing. So I turned around and drove back towards my house. I had taken the gas cap off and it seemed to run better. But when I reach the road to my house it began sputtering much worse than it had before and it would not move while idling like it had done the day before. This time I smelled a weird smell and the digital readout on the dash flashed the stop engine message which had not happened before either. I managed to get it home. I'm not sure where to start looking for the problem since I already replaced the fuel filter. I have little resources or money to fix it. Does anyone know what the problem might be from your own experiences with a 2002 envoy?

Thanks I'm going to try this just put 50 bucks got 14 gallons and drive 36 miles a day to work for two days I need more gas in the last 3 weeks I spent 340 dollars taking my son to work I'm trying this or get a new car it's 2005

Ours idles rough with the AC on......300 mile highway trip yesterday was down on power a bit and downshifting itself (on cruise control) on hills it really shouldn't have had trouble with...it's an 06 with the filter in the pump module... Supposed to leave on a 1700 mile trip across the Rockies in a couple of days.......Anxiousness.... Not good!

I didn't see a jack stand. If your making a video for others to follow your instructions..you should at least tell them to never crawl under a car supported by just a jack..block it up or use a jack stand for safety. Otherwise..good video!

I enjoyed it, but a bit nervous about trying to do the same

Mine sputters a bit in the am after I hit 40 mph I'm trying this next thanks

Just changed fuel filter. Still low rpms. Rins rough

You should watch before posting. Didn’t see you taking filter off

Auto zone w won’t even let me buy this part for me tb

Please support the channel by subscribing!

older models dont have an external fuel filter and they are internal with the fuel pump