I know when setting timing, we connect pin TE1 to E1, I get a great steady 10 degrees, runs like a top, no misses or anything after an hour of running. What does "Exactly" does connecting these two pins do?? For I'll shut down the car, remove the paper clip connecting the pins and start it up and it will engine light code out again to random missfire cyl 1 and cyl 6 and indeed miss. P300, P301, P306.
Is my ECM going bad?
BJ

 

you might need plugs/wires? have bad gas? or have a weak coil/ distributor if 1/6 are companion cylinders i think they are. Or could even be valves.

Putting te1 to e1 reduces the advancement of timing the ecu is firing the spark before the engine is at top dead center.
The sooner spark happens before top dead center or tdc increases power to a certain degree but it also means the piston can blow the spark out if your spark is too weak and cant fire when there is compression giving u the misfire code.

Could also be a bad Ecu, just take the cap off the ecu and see how it looks

 

Have you tried adjusting the distributor to see if it runs well without the paper clip in?

 

1997 SC300, no individual coils, one main. TE/E1 must also put the system in a test mode that goes on stored values for gas/air ratio ect because miss goes away.. Spark is strong in 1 and 6 cyl. Engine condition is very good, only 105k miles. Last year drove it home over 800 miles, no problem, now after getting all it's goodies, new rotors, brake calipers, shocks tires , and now Timing belt/water pump, decides it does not want to run right means to me something got jostled loose or a wire got broken in the anterior Primary 02 sensor or maybe the crank sensor. Wires near the repair. Broke out the manual available online but have to sift through S400 data. Seems more geared toward the S400. Would like to find a later one online, any input here??
Time to order a nice scan tool.
BJ

 

Can someone point me to where I can see what the plug to the wire harness to 02 sensor on bank 1. How can I test the plug on the harness , not the 02 sensor...??
BJ

 

Look up the pin on the ecu, unplug ur battery and ecu and then check continuity from each terminal of the o2 connector to the corresponding terminal at the ecu connector. Google the ecu pinout and you know what o2 ur on theres only 2-4 wires

 

I see, I had to do that for the sons 90 4Runner. I did get a scan tool and maybe someone here can help interpert the data. Here is the engine fully Hot , one data cycle , at idle.
Fuel system 1 status CL
Fuel System 2 Staus CL

calculated load value 14.1
engine coolant temp 190

Short Term Fuel trim - bank 1 0.8%
Long term fuel trim - bank 1 7.8 %

Short Term Fuel Trim - bank 2 0.8%
Long Term Fuel Trim - bank 2 6.3%

Engine Rpm 718

Ignition Timing Advance for #1cyl 14.5 degrees
Intake air temp 91 degrees

air flow rate from Mass Air Flow sensor 0.4lb/min

absolute throttle position 10.6 degrees

oxygen sensor output voltage (B1-S1) 0.740V

Short Term fuel trim (B1-S1) 0.8%

oxygen Sensor output voltage (B1-S2) 0.580 V
short term fuel trim (B1-S2) 99.2%
Oxygen Sensor output (B1-S1) 0.060 V
Short Term Fuel trim (B2-S1) 0.8%

 

I doubt an O2 sensor would cause a miss as you describe it. Someone asked above, what happens when you move the distributor when not in test mode?

 

I have not tried to move distrib since when in test mode, TE-1 to E-1 reads 10 degrees on cyl 1.

I will Try today and post

BJ

 

so if this was at idle in park calc load should not be at 14% if you were in idle with the brake on its fine.
the long term fuel trims are adding a bit of fuel but i would be concerned with [short term fuel trim (B1-S2) 99.2%] because that number doesnt seem right. Can you give me more details on that

AN o2 sensor wont cause missing but a bad A/F sensor ( the first one b4 o2 sensor) sure can.

Did u check the ECU circuit board. the cover is held on by 4 screens just take a peek or post a pic if ur not sure what to look for.

 

If what you say about the load being to high, maybe due to cyl 1 and 6 not firing and giving more work? I took the plugs out on 1 and 6 and clean? maybe the injectors. Just seems strange after the timing belt change. Another here called Groundzero had the same problem but not a definitiive answer.

 

I'll post more when I get to working on it again this weekend.
BJ