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I have a check light for three to five years now and cannot find out what it is. I did a buzzer test and it did three long and one short or one short and three long. So i assume those are eighther 13 or 31. Am i correct is thinking this and what and where can i fix this dang thing? I changed the mass air again just recently, thaught i saw that the air temp sensor was on there sometime ago.. Any help would be greatly appriciated.. Charlie.

It's inside your mass airflow sensor. Put a different MAF on the car.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

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13 is ait but since you said you replaced the maf allready..
try 31 it is the knock sensor..


Steve

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Steve 89 colt 2.3 stroker stock top end. evo3@20 psi 13.489@99.30mph 3/10 2012
On drag radials.auto trans.launching @ 5 psi and no traction thru 2nd.

Ahhh shoot i replaced that too, I didnt use a torgue converter because i dont have one. Also because it is soooo hard to get up in there with any tool if you've ever dont it already. Could i have over tightened or undertightened or why would i be getting the codes 31 or 13 still i wonder. I hear ticking like a lifter and then it goes away , but it seems really loud. My friend says yesterday he thinks it sounded like a knock sensor making noise..HMMMm is this possible anyone? Charlie.

I just snug it good.. but not over tighten it.. also make sure its plugged in good..and the connector pins arent bent.

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Steve 89 colt 2.3 stroker stock top end. evo3@20 psi 13.489@99.30mph 3/10 2012
On drag radials.auto trans.launching @ 5 psi and no traction thru 2nd.