Recent content by mngopher22

Yeah they can on the trailblazer, its one hex screw, so you will need a hex bit and I am forgetting the size off the top of my head. Once the screw is out, it takes quite a bit a pressure to remove it from its fitting. It has a seal and that lip kinda makes it hard to remove and put back in...

Hello all. I am posting to give back to the community because I have learned so much from here. I have been battling an ABS issue for the last six months. The ABS would kick in at low speeds and braking. Recently it got really bad wehre it would engage at higher speeds when braking etc. Also...

UPDATE The GOOD ok i replaced the thermostat and ECT. The ECT sensor broke off in the block and I had to use a reverse thread drill bit to back it out. Glad I am done with that. On a positive note, the thermostat and ECT change made my temp gauge read 210 dead on when im driving so I am very...

I may just go ahead and order one more upstream sensor to rule it out. Ok presuming the exhaust is getting contaminated, how would I go about looking for cracks on the manifold from underneath? The reason i ask underneath is because a couple months ago when all this started I pulled of the...

In that pdf you link above, in section "Oxygen Sensor Signal Checks" It states that you should run engine 2 mins at 2500 rpm, next line it states that signal frequency should be 8 cycles in 10 seconds ie at least .8Hz. Is this at idle then? or at 2500 rpm? Either way from my waveforms in the...

Just adding more information about diagnosing my P1133, I have attached a picture of my gauge, it always runs at 2 notches below 210. The second picture shows both upstream o2 sensors that i have. btw the AC Delco o2 sensor I bought from rockauto is labeled NTK on the sensor. strange The third...

Any follow up on this ACE1875? Did a new oxygen sensor fix everything for you?

I have a huge request from the community, could someone with a trailblazer and a OBD datalogger plot data of the upstream o2 sensor during idle and at 2000 rpm. I would like to compare with my o2 sensor data and determine if the o2 sensor data should have a higher frequency and also a 50% duty...

Were you pulling any code before that? P1133 per chance? I am consistently reading 190 or below so I should probably replace the Thermostat and ECT sensor, do you agree?

I have only replaced the upstream sensor. I thought engine coolant should be around 210??? The needle on my car consistently reads two ticks to the left (IE I know its just the dash gauge thats why I read the engine data from OBD) but shouldn't it be at 210 exactly? One person thinks the O2...

So your recommendation is not to replace the ECT and thermostat? How about ordering these parts below, are these the correct parts? I may just end up trying once more a brand new upstream O2 sensor

Still trying to understand lazy, do you mean slow switching frequency ie the amount of times it switches from rich to lean and lean to rich in say 1 second? Or do you mean how long it takes to transition from lean to rich? On a happy note, I found that during some previous drives home I...

I just want to understand what is meant by lazy. I have read a lot about o2 sensors and have seen the term lazy to describe a sensor thrown around a lot. From what I have read when the magnitude is less ie its not switching from .1V to .9V that has been described as lazy. In my waveforms...

I am going to try again tonight to get fuel trims and engine collant temp on the way home. In preparation for replacing the thermostat and ECT sensor, I want to make sure I am looking at the right parts. Is the correct thermostat for a 2004 I6 Chevy trailblazer part number 1511006 from...

Yah a while back that was the first suggestion and I looked all over the exhaust manifold and I didn't find a leak.