code 52 without "limp" mode

[2543arvin]

Okay, about a month ago, I got the code 52 and the car drove like shit, and I got the knock sensor rewire kit from Shaeff. I installed that and no more code 52 and car drove great. Well between yesterday and today my car has thrown the code 52 three times but it drives fine. It just runs really rich, which I will get to in a minute. What causes the car to throw the code yet still drive normal? If the knock sensors were bad would it drive normal or would it go into the limp mode?

On the other note, my car is burning nothing but black smoke it seems unless I go wot, then it will clear up. But just idling or cruising, it will start to stumble and I will see the black smoke in the mirror. My question is would my Oxygen sensor cause this. When I swapped downpipes, my oxygen sensor banged into my valve covers. Not really hard but a distinctive sound of it hitting metal. Can that damage an oxygen sensor? Would my car throw the code for the oxygen sensor if it was damaged? Is there something else that could cause the car to run so rich and stumble at lower RPMs?

Im sorry for the long post and all the questions but given the help Ive received here before, I knew this was the place to ask. My mechanic seems to go "off the top of his head" on most of my problems.

Thanks,
Brandon

 

[Frank Rizzo]

Yes, O2 sensors are delicate objects. Any sudden force will fubar an O2 (like trying to take it off with a wrench and hammer) or a rapid change in temperature (like trying to cool a hot one).

Check out your solder job on that KS rewire, maybe it got knocked loose. Any other codes besides 52? I'm sure someone more knowledgeable will chime in.

 

[2543arvin]

Yes, O2 sensors are delicate objects. Any sudden force will fubar an O2 (like trying to take it off with a wrench and hammer) or a rapid change in temperature (like trying to cool a hot one).

Check out your solder job on that KS rewire, maybe it got knocked loose. Any other codes besides 52? I'm sure someone more knowledgeable will chime in.

UPDATE on the code 52: I checked my solder job and it looked good but I decided to resolder them anyway. Well it worked and its not throwing the code anymore. I guess that was just my novice soldering job. I feel much more confident about these welds though. Thanks Frank.

 

[2543arvin]

bump

 

[viper92086]

i got the same problem... i need to check my solder job on the knock sensor side

 

[2543arvin]

i got the same problem... i need to check my solder job on the knock sensor side

When I resoldered them, the code went away, but Im still wondering why my car stumbles under partial throttle. At wot, it drives fine but at cruising speeds, it starts stumbling and decreases speed. Anyone got any ideas?

 

[ms07s]

My supra is doing the same thing. I have a new O2 on the way and hope it will help.

 

[2543arvin]

My supra is doing the same thing. I have a new O2 on the way and hope it will help.

Well, keep me posted, O2 sensors are too expensive for me to replace in hopes that it fixes the problem.


Can a mod change title of the thread that suits the current problem?

Thanks,
Brandon

 

[jetjock]

Lucky for you because a bad sensor can't cause that symptom and even if it could it's easily tested. Why buy stuff unless you need it?

 

[ms07s]

Need it anyway...I tested it and it is quite dead:3d_frown: If it does not fix it I hope someone else here will find the answer. New sensor is only like $35. But I do have a bud at toyota giving me the hook up so I don't know how much it is off the street.

 

[cuel]

Bosch single wire universal is around the same price, iirc. Even comes with a plate so it'll bolt in the stock location.

OP: Sounds like you have fuel delivery problems; Injectors hanging open, or maybe the csi stuck open. Could be a coolant temp. sensor, but I don't think it would make it run that rich.

 

[ms07s]

Yea? I have a new csi here and some injectors I'm getting flow tested and what not. But I was only doing those because my car has 137000 miles on it and thought it may need it. Never even thought they could be stuck open....guess I will know soon enough.

 

[2543arvin]

Okay, I figured that I would update this thread a little. Today I decided to install my SAFC, and while I was wiring it up I found a wire that had been cut right through and taped on both ends. Checked the pinout of the ECU and it was my O2 sensor signal.....WTF? So I wired the two back together along with the SAFC and now the problem is gone. I dont know which one fixed the problem because with the SAFC I had to remove some fuel.

So if it was the SAFC or if it was the O2 sensor wire that was cut, either way, problem gone and the supra screams again.:evil2:

 

[jetjock]

As I said it couldn't possibly have been the O2 sensor so you band-aided the problem by removing fuel with the SAFC. Not sure I'd be happy with that solution even if the engine seemed to be running right.

 

[ms07s]

Nice. Good to hear your problem is now fixed! My o2 is here and it is going in tomorrow. Safc is badass I want one:naughty:

Edit: not fixed? What else could cause those symptoms?

 

[jetjock]

I was referring to the excessive richness/black smoke during cruise. Lots of things could cause that including the now repaired code 52 that he mistakenly thought didn't have any effect on the engine. What won't cause it is a bad lambda sensor. Or any other trim sensor for that matter. Even a TPS telling the engine it's at WOT when it's really at idle won't do that and it has more authority than the lambda sensor does. All this is EFI 101 and applies to more than this engine. Understand I'm talking stock though. If he's changed certain stuff all bets are off.

 

[Frank Rizzo]

It's lambdaprobe.

For shits and giggles a new O2 from the dealer is $140.

 

[giterboosted]

this may possibly have not a dang thing to do with the problem, but before it blew the rest of the way i had a partially blown head gasket makin the same problem for me,
it would run like absolute crap at idle and in lower rpms but when i got on it good and the boost built up (stock boost FYI) then the skip like symptoms went away, i highly doubt this is your problem but i just thought id throw it out there

hope ya get it man, good luck