June 13, 2011A real head scratcher here...In the morning it starts right up,High idle is working 15 to 20 seconds then goes to curb idle...Drive it anywhere or distance,Park and shut it off 50/50 chance...No start/strong,raw gas odor...When you do get it to start,runs rough and black smoke out the tail pipes,then clears up...The exhaust system has been changed to a very sorry excuse for Dual glasspacks with NO o2 sensors present!!! All I can find is the left o2 sensor wire...I thought EFI has to have working o2 sensors to operate!!! Any help with correcting this problem would be greatly appreciated!!! Thanks Roy
Forums : Tips & Tricks : `89 K2500 5.7L code13-o2 sensor fault...No o2 sensors present!! (2802 Views)
June 15, 2011Anybody?????
June 15, 2011My guess is an exhaust system that has the correct sensor bungs and add the o2 sensors. Your right EFI does need the sensors to work correctly. It is starting up cold but once the heat builds in the emissions system your pcm is trying to over compensate for the missing o2 sensors therefore adding either too much fuel or air. sounds like yoour running too rich and its dumping way too much fuel. Fix the exhaust problem and you will actually pick up about 2-5 mpg also. Hope this helps.
June 16, 2011Thanks Griff!! A new exhaust system was in the works...But I`m still wondering why it started this problem out of the blue? I bought the truck in February,And it ran great! Then in May the ICM went out.I replaced it and the truck ran great again...Then last week it started acting up(with symptoms in opening thread).As I stated then..."A real head scratcher"...I still think it`s something other than missing o2 sensors...The truck was getting average of 13 mpg,Which is pretty good for a 5300# truck with 373 gears and a non-overdrive automatic transmission(Turbo 400) and 285-85r16 tires.If it keeps messin` with me,I`m gonna put an HEI distributer and a carb and intake set-up on it and be happy in "Old school"...Which to me is far more trustworthy than "FUEL INFECTION" LOL!!!
June 16, 2011Thats a whole new spin on it. I thought it was an ongoing problem. Thats strangethat it is just acting up now. If I can think of anything else I`ll let you know. but now I`m scratchin my head too. I love fuel injection when its working properly but I`m the same way, I have a few intakes and edelbrock carbs layin around the shop. and when the injection gives me trouble I threaten the truck with the carbs. lmao
June 22, 2011Anybody got a clue???? Problem is still here...Thanks Roy
June 23, 2011what was the temperature like up until may? was it similar to February and than start recently spiking up (its been like that up here, i haven`t even seen 80 where i am yet) also, before may, what were your trips like, compared to now, long trip, short trip, hours between trips, minutes between trips, days between trips, and what combination of the above is most likely to cause the problem?
also, did you get a new, or used ICM? could be faulty would be my first guess, see about getting a warranty replacement, but i`m at a loss. just kinda trying to fish for ideas and get more info
June 25, 2011Hey everyone!! I replaced the ignition switch and the problem appears to be fixed...Knock on wood!! For the past 2 days it has been starting and running good every time,Hot or cold.I will keep y`all posted on the running of the truck for a short while...Thanks Roy
June 25, 2011Also, As far as "o2"sensors...I`m still scratching my head on that one!!! As long as it runs good...I`m fine with it!!! Roy
June 25, 2011hey since your still scratching your head on the o2 sensors
theres only 1
the 88-95 trucks only ran with 1 o2 sensor
i think the 88-93 trucks had it on the left side in the y-pipe connector and know that the 94-95 trucks had it on the right just before the cat
forgot to add it is not needed to have the o2 sensor hooked up
it will throw the code and cause the engine to run in a pre-determind mode by the computer also maybe cause you to loose mph
but it will not cause any bad effects to the engine
if you want to have it hooked up you may be able to get away with adding the o2 bung behind the left header or manifold (which ever you have) and just hook it in that way
September 1, 2011I finally came to my senses...HEI and Carburetor Really fixed the problem. And picked up 2 MPG!!! Fuel "INFECTION" Sucks!!! Thanks to all who offered Help!!! Technology is a wonderful thing...As long as it is in someone else`s driveway!!! I`ll take "Old School" Anyday!!! Thanks again... Roy