Hi all
We are just getting back from first season for blaze..Seems like fairly capable off road buggy..Had some issues on highway as we used it to go between hunting grounds, long story shortP0 131 02 sensor circuit low voltage.Going up hill all no power couldn't get over 60 kmh..Almost seems like limp mode,not sure what direction to go in
it's a 1996

 

Do you have scanning capability that can view live data and graph O2 sensors?

If so, let’s start with what are your fuel trims? If you can’t graph O2 sensors are the two pre cat sensors switching back and forth between approx 0,15 and 0.85V?



George

 

According to my friend with his snap on scanner ,o2 sensors appeared ok.
there was misfire on random cylinders 1 2 3 5 ,I don't know what it could be.
HE suggested injector spider, or cat

 

This could be a dozen things: Fuel delivery, sensor function, ignition, timing, mechanical failure, excessive back pressure, .... You need to start narrowing down the list to find the problem. Sure we can guess, I can throw at least two dozen ideas at you and I gaurantee its one of them but that's no way to go about this. The ECM is getting O2 sensor voltage values that are outside of normal operation. The question is if its the O2 sensor itself, the wiring, the ECM or the exhaust is way out of whack and the system is reporting correctly. That's why I asked for fuel trims to start to narrow this down. How confident are you in the opinion that the O2 sensors are OK? There is the sensor element (voltage levels and switching speed), the heater, the wiring, the bias voltage and the ECM. If you have a code for the O2 sensor then something is wrong. You also need to do the fuel pressure test in the sticky.

If you want to pursue the cat converter then if he meant clogged then you do a back pressure best. If he meant its lost its catalytic capacity then you do an oxygen storage test and look at the front and rear O2 sensor graphs on a capable scanner.

If you want to pursue the spider then start with fuel pressure then you can move on to injector testing if you want.

AT a high level there is also ignition, timing and mechanical problems (compression).


George

 

This may help:

https://blazerforum.com/forum/2nd-ge...72/#post732722



George

 

What a crazy amount of information 😳

 

It’s a lot but that’s to show you how long you can be at it if you just pick random possibilities and stab at it. If a good mechanic got your truck they would check codes, Freeze frame data, fuel pressure, ignition, and then possibly compression and fuel injectors. In less than an hour they would know which one of those it is, then on to the exact cause. Stabbing at it leaves every one of those possibilities in play until you get lucky.


George