Last post on Dec 08, 2013 at 1:46 PM
You are in the Toyota Corolla
What is this discussion about?
Toyota Corolla, Sedan
#3814 of 3858 98 corolla
Jan 24, 2012 (10:27 am)
I have a 98 corolla and deconnecting the positive battery cable for a few minutes, on my 98 corolla , works good to reset the engine light when it has come on, I have done this many times, and it works, And my engine light is no longer on, And I ask why at summit racing and was told when desconnecting the battery it makes the car computer reset the engine light, Sorry i sound harsh, but alot of toyota motors have sludge on the inside of valve cover and still run good like that, So if you remove the valve cover and see some sludge, I would call that more of a guess, because many motors that have sludge are still running ok with no problem, I have a 1993 camry with 270000 miles on it and it has sludge under the valve cover, And is still running I would say excellent. Yes it could be the sludge with his motor, but if it was I do not think it would have showed up after picking his car up from a repair shop, I think if it was sludge then his motor would have been acting odd for a while, and He even said he changed his oil regulerly so he should not have had much sludge. So why I still think its a guess about it could be the sludge if you see it under the valve cover, He said his oil light was on so he needs to have a oil pressure test first to make sure he has proper oil pressure. The End.
#3815 of 3858 also 98 corolla
Jan 24, 2012 (10:32 am)
Also if his motor was not having proper oil pressure than that will make the motor run hotter because of low oil pressure, and he said his temperture gauge was higher than normal, So it makes sence to do oil pressure check first before pulling the valve cover to check for sludge.
#3816 of 3858 Re: 98 corolla [alex24]
by MrShift@Edmunds HOST
Jan 24, 2012 (11:33 am)
yes, thanks for the advice.
Well that's why I posted the photo so he knows the difference between some dirty oil and real sludge. If his engine looks like that photo, that engine is done for IMO. I agree, I didn't want him to get fooled by just looking at a dirty valve cover.
You can sometimes reset the engine light on an OBD-II car if you can drain the capacitor completely from the Stay Alive Memory module. (one trick is to hold down the horn button after you disconnect the battery). Otherwise, just disconnecting the battery and re-connecting it usually will not work on an OBD-II car.
In any event, it's not a good idea to do this on an OBD-II car. For a mechanically minded guy like you, you can deal with the effects, but most people could end up making things worse for themselves.
#3817 of 3858 Re: 98 corolla [Mr_Shiftright and alex 24
Jan 24, 2012 (8:15 pm)
Thank you mr. Alex 24 and Mr. Shiftright for your excellent responses. I am clearly impressed with your knowledge and willingness to help. I do recall the mechanic telling me that he did a pressure test and it was not good (Don't remember whether he said that there low pressure or high pressure but it was a concern)
Yesterday I asked the dealer to take the oil pan out and clean the sludge (if any). Today i went to pick up the car and the mechanic had already left so I could not talk to him. However the service person told me that he cleaned out the sludge from the pan and the screen. He changed the oil and the oil filter then he took the car for a test drive and the oil light did not turn on. This is all I got from the service guy, of course its a second hand. This all sounded very nice to me. But i am going to talk to the mechanic and get all the details tomorrow. I did not pick up the car because I want to discuss the benefit of taking off the valve cover and look for the sludge.
Being a lay person I am not sure (after reading all the posts from you both) whether I should have the valve cover removed or not. Or drive the car and see if and when the light comes on again.
Thanks a lot for all your help.
#3819 of 3858 Re: 98 corolla [parthanon1]
by MrShift@Edmunds HOST
Jan 25, 2012 (9:03 am)
Yep I'm sure Alex knows about the sludge issue. And That's why I posted that photo for you, because this issue does come up with Toyotas.
I suggested taking off the valve cover to *verify* this claim of sludge. So far you have no evidence whatsoever that what they said was true.
if we presume they did what they said---If they cleaned the oil pan and there's still sludge like in the photo up in the cylinder head area, well then nothing permanent has been accomplished.
Jan 27, 2012 (7:02 pm)
Just want to give an update. As i mentioned above the dealer cleaned the pan, the pick up tube and the screen. He also opened the valve cover and cleaned the sludge. I am driving the car for the last 2 days and 50 miles and no oil light has come on, however the engine temperature stays at 40%. There are no guarantees, but i got some time to buy another car.
The question i have is
1) whether Toyota has solved the problem to trust them and buy another Toyota?
2)Have you heard of failures in 2011 or 2010 model Corolla?
I have posted the same question under the new topic, 'excessive oil use'. Hope to catch most responses.
#3821 of 3858 Re: 1998 Corolla [parthanon1]
Jan 28, 2012 (4:35 am)
When you say temperature is about 40% that sounds perfect? In other words the temperature gauge is just about half way up, right?
#3822 of 3858 Re: 1998 Corolla [parthanon1]
by MrShift@Edmunds HOST
Jan 28, 2012 (9:42 am)
Well my understanding is that Toyota re-designed the engines somewhat and also emphasized the use of synthetic oils....I think that basically, for whatever technical reasons, the oil in these engines would break down sometimes, under certain conditions. It's not like every Toyota engine does this, but enough of them did to create quite a ruckus.
#3823 of 3858 Re: 1998 Corolla [terceltom]
Jan 28, 2012 (7:49 pm)
Yes the temp. gauge is at a little less than half way. Before the problem started it was at around 25%. I do not have oil light but the temp. gauge is higher. I am checking the oil level and does not appear to be losing oil. There still may be some problem.