LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

o2 or injector?

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Old Jun 10, 2004 | 08:02 PM
  #1  
TrouserSnake's Avatar
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o2 or injector?

Ok on the tech 2 aparentally nether o2 sensors are working...

I foul a set of plugs out in about 28 minutes of the car running...

I got code a injector code...

and neather 02 sensors would swing... for a while the one would now neither will...

Could this be a ground?

where are they located?

If 1 injector was stuck wide open what would happen?
Old Jun 11, 2004 | 01:18 PM
  #2  
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And the year of your car is??????

Let's guess, and assume its OBD-I. The drivers side sensor is screwed into the bottom of the exhaust manifold, the passenger side is slightly below that on the Y-pipe.

Since you have the Tech-2 on it, what DO the O2 sensors read when the engine is running? If they aren't "swinging", they must be standing still. What is the mV reading for both sides? Was it fully warmed up, coolant temp above 140degF, and at least 3 minutes since startup when you scanned it? Did the Tech-2 indicate "closed loop enabled"?

Also with the Tech-2, what "Cell" is the fuel control system in, and what are the long term corrections (BLM's) for that cell?

Was the injector code DTC 18? Have you verified that each injector harness connector is getting +12V to the pink wire? Have you put a 'noid light on each injector to verify that the PCM is providing the ground to fire it? Have you checked the resistance of each injector (12-15ohms)?

A faulty injector should only affect one cylinder, and only screw up the bank of the engine the faulty injector is on. If you have an injector that's pouring fuel into one cylinder, only that plug will be fouled. The excess fuel that blows out the exhaust valve will consume the excess oxygen from the other cylinders, and the PCM will say "rich" and start reducing fuel to that bank.... If the injector simply stops supplying any fuel at all, the air from that cylinder that blows into the exhaust causes a "false lean" and causes the PCM to add excess fuel to that bank of the engine... all cylinders run rich and can foul, in that bank.

Again.... and in all honesty I think I've mentioned this before, it HELPS people answer your questions if you include the year of your car in your "signature".
Old Jun 11, 2004 | 03:12 PM
  #3  
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The car is a 94... Last year the oil was smelling gas... and started running like crap.. It has to be a leaky injector in the mix...

But for a while the right bank would swing and not the left... And I guess now neather where swinging...

Ill get the tech 2 on it again and let you know...
Old Jun 12, 2004 | 06:04 PM
  #4  
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ok... Got everything put back together to where it could start If I didnt have this problem...

I put new plugs in it And I dont wanna start it till I try something new.. Because Its to hard and expensive to keep changing them and they only last a about half hour...

Where do I start.. Its one of a couple things Injector... Ground..

Something is making just the tips of every single plug black like a peice of charcoal...

Point me in a direction and we can go from there.. Ill start narrowing it down.. What will need to buy to check what where to start
Old Jun 13, 2004 | 10:34 AM
  #5  
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TTT Should get the Tech 2 over here today... So get ready to help a ltoner out
Old Jun 13, 2004 | 09:03 PM
  #6  
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It was closed Loop and It was Code 18

Help me out here Boys
Old Jun 13, 2004 | 10:12 PM
  #7  
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18 - Injector circuits
Old Jun 14, 2004 | 09:27 PM
  #8  
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now where does one start...

I mean If you where In my postion...
Old Jun 14, 2004 | 10:35 PM
  #9  
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Originally posted by TrouserSnake
now where does one start...

I mean If you where In my postion...
Have you followed up on my suggestions?
Was the injector code DTC 18? Have you verified that each injector harness connector is getting +12V to the pink wire? Have you put a 'noid light on each injector to verify that the PCM is providing the ground to fire it? Have you checked the resistance of each injector (12-15ohms)?
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