Spark problems

Daluz · 04-16-2011, 04:05 AM

So i just bought a supra two days ago, and the only problem that it seems to be having is that every time i turn the car off it fouls the plugs. so every time i have to change them, it seems to be a carbon build up instead of oil, what could this be? bad air/gas ratio?

Sonyps307 · 04-16-2011, 06:58 AM

Maybe o2 sensor

Daluz · 04-16-2011, 11:55 AM

yeah i was thinking bad o2 sensors, or a bad MAF sensor

GT-A · 04-16-2011, 12:19 PM

That doesn't make sense! Plugs are not fouled after shut down unless you have multiple injectors leaking. Which is very unlikely. Make sure that the plugs are the correct specification for your engine. Yes O2 sensors are a common problem on a vehicles this age, although there are several area's which may cause your engine to run rich. Have your engine tune checked by a trusted professional. I doubt you'll be up for big dollars.

Daluz · 04-16-2011, 02:13 PM

thanks, well i just started the car up with the new plugs he gave me and they are already fouled, idk whats wrong with it. also it takes for ever to start up, hald the time you have to pump the accelerator untill it stays running

cre · 04-16-2011, 11:30 PM

Post pictures of the plugs. Is the oil coming from the plug galley (the oil on them will be wet and it'll be on the end of the plug wires too)?

Daluz · 04-17-2011, 02:16 AM

its not oil its carbon, its like powdery not wet and sticky so thats why i know its a bad fuel air ratio but i dont know what all can make carbon fouling. someone told me to check my igniter could it be that

cre · 04-19-2011, 05:09 AM

If your mixture's that far off you'll be smoking like a 3400lb cigar on the road. Igniter's worth looking at so is the cold start injector, the AFM, the coil pack wiring (particularly the ground) and knock sensors and their wiring.

Have you checked for diagnostic codes yet?

Daluz · 04-20-2011, 08:36 PM

where is the o2 sensor located on a base model i cant find it anywhere

Daluz · 04-20-2011, 09:50 PM

Alright so i found where my 02 sensor goes i have the pace setter full exhaust so its on the down pipe, its blocked off, i just got my new 02 sensor in also, but the thing is i cant find the wiring connecting to the 02 sensor so i have nothing to plug it up to, can somebody help me

04-16-2011, 04:05 AM	#1
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	Spark problems So i just bought a supra two days ago, and the only problem that it seems to be having is that every time i turn the car off it fouls the plugs. so every time i have to change them, it seems to be a carbon build up instead of oil, what could this be? bad air/gas ratio?

04-16-2011, 12:19 PM	#4
GT-A Stock Join Date: Apr 2011 Location: Australia Posts: 2	See a pro. That doesn't make sense! Plugs are not fouled after shut down unless you have multiple injectors leaking. Which is very unlikely. Make sure that the plugs are the correct specification for your engine. Yes O2 sensors are a common problem on a vehicles this age, although there are several area's which may cause your engine to run rich. Have your engine tune checked by a trusted professional. I doubt you'll be up for big dollars.

04-16-2011, 11:30 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Post pictures of the plugs. Is the oil coming from the plug galley (the oil on them will be wet and it'll be on the end of the plug wires too)? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-19-2011, 05:09 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If your mixture's that far off you'll be smoking like a 3400lb cigar on the road. Igniter's worth looking at so is the cold start injector, the AFM, the coil pack wiring (particularly the ground) and knock sensors and their wiring. Have you checked for diagnostic codes yet? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-20-2011, 09:50 PM	#10
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	Alright so i found where my 02 sensor goes i have the pace setter full exhaust so its on the down pipe, its blocked off, i just got my new 02 sensor in also, but the thing is i cant find the wiring connecting to the 02 sensor so i have nothing to plug it up to, can somebody help me Last edited by Daluz; 04-20-2011 at 09:54 PM.

04-16-2011, 06:58 AM	#2
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	Maybe o2 sensor

04-16-2011, 11:55 AM	#3
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	yeah i was thinking bad o2 sensors, or a bad MAF sensor

04-16-2011, 02:13 PM	#5
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	thanks, well i just started the car up with the new plugs he gave me and they are already fouled, idk whats wrong with it. also it takes for ever to start up, hald the time you have to pump the accelerator untill it stays running

04-17-2011, 02:16 AM	#7
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	its not oil its carbon, its like powdery not wet and sticky so thats why i know its a bad fuel air ratio but i dont know what all can make carbon fouling. someone told me to check my igniter could it be that

04-20-2011, 08:36 PM	#9
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	where is the o2 sensor located on a base model i cant find it anywhere

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