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Old 05-20-14, 09:58 PM   #1
SCHolmes
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Question Will not idle but no check engine light

So I searched the forums and everywhere says when the iacv or tps go out it throws the CEL on. I have a 92 sc300 5spd. It will turn over but will not stay cranked. I have to give it gas for it to stay on. I can drive it and it runs fine. It also dosent do this all the time. So I'm lost. I cleaned my maf sensor, iacv, and throttle body. Can some please help me!?
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Old 05-20-14, 10:16 PM   #2
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Sounds like a fuel delivery issue. Bad injectors? Pump? Regulator? Filter?
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Old 05-21-14, 10:04 AM   #3
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Do the 12v fuel mod. Sounds like your fuel pump ecu is going out.
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Old 05-26-14, 11:56 AM   #4
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I already did the 12v mod and filter was replaced a couple of months ago
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Old 05-26-14, 12:00 PM   #5
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And would it be fuel system if it's not constant. Because I'd figure it be a sensor since it runs fine just messes up time to time
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Old 05-26-14, 05:05 PM   #6
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its iacv cause if you give it agas and it stays on it means the iacv is dirty or not working etc.. open it clean it and assemble should be fine..
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Old 05-27-14, 01:40 PM   #7
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We'll I took it out and cleaned the nipple off so what do you mean open it?

Thank y'all for responding btw
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Old 05-28-14, 01:38 PM   #8
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How did you clean your MAF? I know that if you use cleaner on some of them, it ruins the sensor.
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Old 05-28-14, 01:55 PM   #9
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you aren't supossed to clean the 92 maf's with maf cleaner. only 96+ you can clean like that.
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Old 05-29-14, 08:17 PM   #10
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Well the maf sensor is still good
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Old 05-30-14, 07:50 AM   #11
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Quote:
Originally Posted by SCHolmes View Post
Well the maf sensor is still good
Well just to make sure, test it.



Also, technically, the MAF isn't really, in your case at least, an MAF. Like ALi said, 96 and up are different and can be cleaned with the spray. 92-95 are karmen vortex type, whcih can only be cleaned by blowing it off. In your case, it's not an MAF, it's an AFM...but that doesnt really matter as long as you clean it right.
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Old 05-30-14, 08:07 AM   #12
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I know your air flow meter is questionable now because I have cleaned one before and had that similar problem. 92-95 you cannot clean them really, it even says on the side of the maf cleaner spray not to use on certain older toyota and lexus vehicles, that little warning is for your car specifically.
sit it in the sun for a day or 2 and let it dry out or try gently with a hairdryer to get all the cleaner moisture out of it. sometimes they can work again, sometimes they just wont work again.

not saying it was your original problem, but it could be a problem now depending on how you cleaned it.

where did you hear about the CEL coming on for these things, on a 92 the cel hardly goes off for anything unless its completely shorted, which means you could still have a bad tps or IACV and not have a code. I have had a bad tps on my 95 with no code, drove it like that for a month before finding out I grabbed the tps out of the wrong box when putting my parts back on the motor, put on a spare that was bad by accident.
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Old 05-30-14, 02:21 PM   #13
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I had an issue like this on my 95. Mine also smoked a bit. Turned out being the ecu making my injectors give too much fuel. Swapped the ecu for one i found on ebay and it ran great
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Old 05-30-14, 03:01 PM   #14
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Quote:
Originally Posted by Ali SC3 View Post
where did you hear about the CEL coming on for these things, on a 92 the cel hardly goes off for anything unless its completely shorted, which means you could still have a bad tps or IACV and not have a code. I have had a bad tps on my 95 with no code, drove it like that for a month before finding out I grabbed the tps out of the wrong box when putting my parts back on the motor, put on a spare that was bad by accident.
My previous experiences with cars not SCs this is my first sc.
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Old 05-30-14, 03:02 PM   #15
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Quote:
Originally Posted by SC400slide View Post
Well just to make sure, test it.



Also, technically, the MAF isn't really, in your case at least, an MAF. Like ALi said, 96 and up are different and can be cleaned with the spray. 92-95 are karmen vortex type, whcih can only be cleaned by blowing it off. In your case, it's not an MAF, it's an AFM...but that doesnt really matter as long as you clean it right.
Thank you I'll test it tomorrow
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