Ok, firstly, id like to thank
@Bextreme04 for giving me a rundown on the ECM data i pulled yesterday, he took the time to have a telephone call while we looked at the Excel document from a pull yesterday, and explain what it all meant, etc etc.
Several things were noted within the pull that lasted a duration of 80 seconds, which explains my sporatic engine performance and idle im getting.
The pull was from in drive, foot on brake, then accelerating to 81mph, then a gradual decrease in vehicle speed back down to a slow speed to make a right turn.
Please note, this data was recorded WITH the IAC hooked back up.
1. My TPS% reading sitting with foot on brake is a constant 38%. Something is defunct there.
2. The max WOT throttle TPS voltage i got in the pull was like, 3.7v, when in reality i should be getting 4.7v
3. O2 mV ranged as high as 900 mV (which is apparently equivalent to 14.7 afr) to sporatically as low as 130ish mV. After installing the Bosche o2, i learned from HarrisTuning that apparently the boshe units do not play nice with TBI. My data reflects that. Very sporatic readings that were never consistent.
4. Over a duration of 7 seconds, foot on brake, in drive, MAP kpa started at 44, and ended at 47 with my foot on the brake. I suspect i must have a vacuum leak at the booster or line, because this morning, idling, it maintained a steady 27-28 kpa.
5. The o2 readings gave a pretty much solid "rich" feedback on the switched signal the entire time.
6. I want to add most importantly, the most power was killed at the knock sensor.
Normal driving, keeping the motor under 3500 rpms, i noted 4 knocks. This morning upon cold start up, from 37° to 180° CTS, engine only knocked 3 times on startup, and never again. 2 of those i assume to be self test.
During the pull last night, i got a total of 35 knocks, but the numbers DRASTICALLY increased from 4 to 19 knocks when over 3500 rpms.
After those knocks occured and the motor was ran as high as 4175 rpms, no more knocks occured, they topped out at 35 knocks, and never again.
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My thoughts on all this is, i definitely have a vacuum leak, and since i couldnt discover the leak externally, and since the motor had sat for apparently a period of 8-10 years before i touched it, im suspecting broke down intake gaskets.
I also want to note, i occasionally catch a exhaust leak on my drivers bank, the samd side as the o2. That could be my sporatic mV readings, but im more inclined to lean with an expert of tbi, (brian harris at HarrisTuning) and the bosche just doesnt play nicely with the tbi.
My tps, im unsure where to even start with that, as previously stated, under the hood, i can take the throttle arm, with multimeter, open it to WOT and get 4.7 volts.... inside the cab with data logger, reading only comes out to 3.8 at WOT
Im going to have my wife or a friend press the pedal inside the cab for me while i check tps voltage output with a multimeter. That might be that carpet thickness
@gmbellew
I saw a maximum of 198% on the tps, but no more than 3.8v output. I didnt think it was even supposed to advance to 198%
Something is wrong, wrong, wrong.
Regardless, im getting cheated out of around 1 whole volt of TPS, which means that leaves alot of ign advance on the table.
Addressing the knocking, im personally of the mindset im not producing a complete combustion cycle.
The motor ran its best with 1-2° of advance at base timing, and with a large .055ish plug gap. I turned all that back down to tow because if spark knock, now with a 4.10 ratio, the motor wont labor nearly as much.
But on another note, my ESC module could just simply be ******* me.
Thoughts anyone?
@Chevyguy @1987 GMC Jimmy
Im open your suggestions.
