Code 52 still after changing both KS's????

Stanghunter · 06-24-2010, 05:05 PM

Quote:

Originally Posted by btwilson86

KS= Knock Sensor

Alot of times, the code 52 is from the KS wiring, and not from the KS itself. Usually rewiring the 2 KS on a Turbo Supra (or 1 on a N/A) will correct the problem. Here is the step-by-step rewire page, and here is a thread in this forum discussing the rewire.

And make sure you have that negative battery cable disconnected or you pull the 15 amp EFI fuse out for a few minutes to erase the code from the computer.

Thanks for the response!

What goes wrong with the factory wiring that we need to rewire the KS?

btwilson86 · 06-24-2010, 05:09 PM

Well, it's a 87. So all the wiring on the car is about 23 years old.... After countless hot/cold cycles, the wires become brittle, insulation wears away.... The time is just rough for wiring, so it needs to get replaced.

Stanghunter · 06-25-2010, 04:33 AM

Quote:

Originally Posted by btwilson86

Well, it's a 87. So all the wiring on the car is about 23 years old.... After countless hot/cold cycles, the wires become brittle, insulation wears away.... The time is just rough for wiring, so it needs to get replaced.

Ok, I have now rewired the KS's. It sounded better on start up with a bit of a miss at idle. I let it warm up to opperating temp, hit the gas a few times and no CEL! I'm thinking I'm golden.....take it for a quick drive and it feels like its running on 2 cyl. but still no CEL.

Are the plugs shot after after it got driven in limp mode for 40 miles from my folks house to mine?

I'm done for tonight just looking for advice on where to start on it tomorrow.

Thanks once again!

btwilson86 · 06-25-2010, 05:31 PM

I'd probably start checking your plugs, wires, and timing (in that order) next. It's possible that your plugs could have been fouled, and the ECU running rich while in limp mode might have fouled them more. Also these cars are notorious for leaking oil into the plug valley, so you may have oil soaked plugs/wires.

When you check your timing, be sure to check your valve timing before you check your ignition timing.

Stanghunter · 06-25-2010, 06:38 PM

Quote:

Originally Posted by btwilson86

I'd probably start checking your plugs, wires, and timing (in that order) next. It's possible that your plugs could have been fouled, and the ECU running rich while in limp mode might have fouled them more. Also these cars are notorious for leaking oil into the plug valley, so you may have oil soaked plugs/wires.

When you check your timing, be sure to check your valve timing before you check your ignition timing.

Thanks again for the responses!!

Yes when they brought it over #5 and 6 plug holes where full of oil. I sucked it out with my brake bleeder then pulled the plugs and brake cleaned the holes out. I pulled all the cam cover bolts(all loose) and sprayed brake clean through the bolt holes and re-installed with locktite(blue). I did put 2 new plugs in.

I will put in 6 new plugs in next.

Are the plug wires shot after being soaked with oil? I cleaned them well but I know oil can break down and soak into rubber...maybe still shorting out a bit?? Just want to ask before I spend any more of their money....they already got soaked for $199 EACH for the KS's!

btwilson86 · 06-26-2010, 06:26 AM

Yeah, it is definitely possible that oil soaked wires can cause them to break down and start shorting out.

You may want to find a reasonably priced set of OEM style plug wires at an auto parts store if you're worried about spending too much money... That way you can swap the cheapo's in, test drive it, and if it still doesn't work there's not that much money out of pocket.

Stanghunter · 06-26-2010, 08:59 AM

Quote:

Originally Posted by btwilson86

Yeah, it is definitely possible that oil soaked wires can cause them to break down and start shorting out.

You may want to find a reasonably priced set of OEM style plug wires at an auto parts store if you're worried about spending too much money... That way you can swap the cheapo's in, test drive it, and if it still doesn't work there's not that much money out of pocket.

Well I ran it buy my dad and he wants to stay with genuine Toyota parts, so the wires are ordered. So Mr. Wilson thanks for all your help.....I wont bug you for awhile.....at least until late next week when the parts show up!

Thanks again for all your help!

mk3mike · 11-28-2010, 01:29 AM

this forum is awesome. i have learned everything i know about my car from u guys. i felt i needed to join to say thank you to everyone who takes the time to answer these questions.

06-24-2010, 05:09 PM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Well, it's a 87. So all the wiring on the car is about 23 years old.... After countless hot/cold cycles, the wires become brittle, insulation wears away.... The time is just rough for wiring, so it needs to get replaced. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

06-25-2010, 05:31 PM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	I'd probably start checking your plugs, wires, and timing (in that order) next. It's possible that your plugs could have been fouled, and the ECU running rich while in limp mode might have fouled them more. Also these cars are notorious for leaking oil into the plug valley, so you may have oil soaked plugs/wires. When you check your timing, be sure to check your valve timing before you check your ignition timing. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

06-26-2010, 06:26 AM	#6
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Yeah, it is definitely possible that oil soaked wires can cause them to break down and start shorting out. You may want to find a reasonably priced set of OEM style plug wires at an auto parts store if you're worried about spending too much money... That way you can swap the cheapo's in, test drive it, and if it still doesn't work there's not that much money out of pocket. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

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