12-11-2018, 12:05 AM
there are lots of test on any engine, that runs rich like yours.
does the engine warm up and reach and hold 180f, it not the ECT reads wrong and will flood fuel) this rule 1, as is IAC opens cold or will idle rich and stall.
1: FIRST IS THE ENGINE compression on all 4cyclinder, sparks out, WOT cranked, 180 to 200PSI.
2: next is vacuum testing, 19" inches HG at idle. the play with idle and make sure the vacuum does not act backwards(clogged cat)
http://www.fixkick.com/sensors/tests/cat-con-tests.html
3: it is not bad spark but? who knows? lacking misfires sensors 1996:
what the video shows is gross flooding and so bad it bogs. black earth, super rich for sure.
4: scans show 52, for rich, (and clears but 52s takes lots of driving flip this and well the 52s are real)
5: I dont think the ECU is bad or got wet or get contamination, but who knows, ?
6: we test the MAF next, even if replaced 5 times use a volt meter on the output pin, http://www.fixkick.com/sensors/92-95MAF/...sting.html
7: the maf power pins is 12vdc, (15vdc idle)
8: the ECU +5vdc Reference pin (runs sensors not maf, ) pin B6 seen here. http://www.fixkick.com/ECU/temp-sensors.html
9: ECT sensor volts are 3.7vdc 32f cold and at 180f drops to 0.7 Volts DC< backprobed. http://www.fixkick.com/ECU/temp-sensors.html
10 fuel pressure is next. 3 tests.
11: and injector tests, or clean them. they must not leak.
now let talk carbon, there is the horrible weakness in all narrow band 02 sensors.
simply said the carbon covers the 02 tips 100% forming a blanket of solid carbon, and this means it can not measure oxygen.
this confuses the ECU, this effect, and may do the wrong thing even go richer.
fuel injector leaks or huge fuel pressure, these Pre 1996 cars love to go too rich and was later cured of that problem. 1996+
the old cars have a too aggressive fuel trim rule set. (AKA, fuel trim authority too powerful)
so if say 2 cylinder misfire, that is 2 slugs of fuel rich, 20% oxygen, slugs, its pumping fuel and pure air.
this pure air makes the 02 go nuts lean and the ECU seen that and trims it max rich, way more rich than any 1996 or newer.
what is important is knowing this EFI is easy to fool and wants to do radical rich for 02 readings wrong.
What if the huge injector connector under the intake manifold. was water soaked and failed.
killing dead 1 injector.?
I use NOID lamp to see that or my magnetic injector tool to see the pulses are good.
the balance test would fail too hard.
does the engine warm up and reach and hold 180f, it not the ECT reads wrong and will flood fuel) this rule 1, as is IAC opens cold or will idle rich and stall.
1: FIRST IS THE ENGINE compression on all 4cyclinder, sparks out, WOT cranked, 180 to 200PSI.
2: next is vacuum testing, 19" inches HG at idle. the play with idle and make sure the vacuum does not act backwards(clogged cat)
http://www.fixkick.com/sensors/tests/cat-con-tests.html
3: it is not bad spark but? who knows? lacking misfires sensors 1996:
what the video shows is gross flooding and so bad it bogs. black earth, super rich for sure.
4: scans show 52, for rich, (and clears but 52s takes lots of driving flip this and well the 52s are real)
5: I dont think the ECU is bad or got wet or get contamination, but who knows, ?
6: we test the MAF next, even if replaced 5 times use a volt meter on the output pin, http://www.fixkick.com/sensors/92-95MAF/...sting.html
7: the maf power pins is 12vdc, (15vdc idle)
8: the ECU +5vdc Reference pin (runs sensors not maf, ) pin B6 seen here. http://www.fixkick.com/ECU/temp-sensors.html
9: ECT sensor volts are 3.7vdc 32f cold and at 180f drops to 0.7 Volts DC< backprobed. http://www.fixkick.com/ECU/temp-sensors.html
10 fuel pressure is next. 3 tests.
11: and injector tests, or clean them. they must not leak.
now let talk carbon, there is the horrible weakness in all narrow band 02 sensors.
simply said the carbon covers the 02 tips 100% forming a blanket of solid carbon, and this means it can not measure oxygen.
this confuses the ECU, this effect, and may do the wrong thing even go richer.
fuel injector leaks or huge fuel pressure, these Pre 1996 cars love to go too rich and was later cured of that problem. 1996+
the old cars have a too aggressive fuel trim rule set. (AKA, fuel trim authority too powerful)
so if say 2 cylinder misfire, that is 2 slugs of fuel rich, 20% oxygen, slugs, its pumping fuel and pure air.
this pure air makes the 02 go nuts lean and the ECU seen that and trims it max rich, way more rich than any 1996 or newer.
what is important is knowing this EFI is easy to fool and wants to do radical rich for 02 readings wrong.
What if the huge injector connector under the intake manifold. was water soaked and failed.
killing dead 1 injector.?
I use NOID lamp to see that or my magnetic injector tool to see the pulses are good.
the balance test would fail too hard.
http://www.fixkick.com