car runs like hitsay and here are the codes... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheSparo · 01-22-2006, 03:46 PM

Codes 12 and 34
12 is MAFS
34 is Knock sensor

now the sensor is good, b/c i checked it w/ a buddy's z32 mafs, so what does this mean? i have a rom tuned ecu, so i dont know about that code

and the knock sensor... i assume it's bad? where is it?

please help me out may car is running like shit.. i can't drive it..

thanks

aznpoopy · 01-22-2006, 09:30 PM

mafs error is probably causing your car to drive crappy.

knock sensor is under/within the intake manifold 'loop' on the intake side of the engine. it's a bitch to get to. try cleaning/tightening/resoldering the engine grounds that are connected to the engine on the upper right side of the valve cover by the firewall. sometimes that clears it up.

TheSparo · 01-23-2006, 10:58 AM

but what do i check on the maf? i mean i don't really know what to try since it isn't the actual mafs

TheSparo · 01-23-2006, 04:28 PM

ok, today i fooled with the wiring somewhat, it seems like the ground has a lot to do with my problem... when i unhook the ground, the car's idle jumps and holds quite a bit higher, but as soon as i hook it back up, it acts like crap, but if i leave it unhooked, and try to drive it, it won't work...
someone please help me out... seems like im talking to myself here

kazuo · 01-24-2006, 01:08 AM

Ground to the MAFS, I assume.

Ground the MAF to the chassis, see if that solves your problem.

Check the plug to see if the ground wire is corroded/grounding itself out/backing out/etc etc

Also check the wire itself all the way back to the ECU to ensure its not frayed and grounding itself out somewhere.

Good luck

TheSparo · 01-24-2006, 10:35 AM

would the groud being a different gauge than normal be bad? i would understand that it would be bad for the signal wire, but is this true with the ground as well?

TheSparo · 01-25-2006, 10:28 AM

is there anybody out there that is able to help me?

01-22-2006, 03:46 PM	#1
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 36 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	car runs like hitsay and here are the codes... Codes 12 and 34 12 is MAFS 34 is Knock sensor now the sensor is good, b/c i checked it w/ a buddy's z32 mafs, so what does this mean? i have a rom tuned ecu, so i dont know about that code and the knock sensor... i assume it's bad? where is it? please help me out may car is running like shit.. i can't drive it.. thanks __________________ 89 240 SR powered... ummm i promise its stock

01-23-2006, 10:58 AM	#3
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 36 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	but what do i check on the maf? i mean i don't really know what to try since it isn't the actual mafs __________________ 89 240 SR powered... ummm i promise its stock

01-23-2006, 04:28 PM	#4
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 36 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	ok, today i fooled with the wiring somewhat, it seems like the ground has a lot to do with my problem... when i unhook the ground, the car's idle jumps and holds quite a bit higher, but as soon as i hook it back up, it acts like crap, but if i leave it unhooked, and try to drive it, it won't work... someone please help me out... seems like im talking to myself here __________________ 89 240 SR powered... ummm i promise its stock

01-24-2006, 10:35 AM	#6
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 36 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	would the groud being a different gauge than normal be bad? i would understand that it would be bad for the signal wire, but is this true with the ground as well? __________________ 89 240 SR powered... ummm i promise its stock

01-25-2006, 10:28 AM	#7
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 36 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	is there anybody out there that is able to help me? __________________ 89 240 SR powered... ummm i promise its stock

01-22-2006, 09:30 PM	#2
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 40 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	mafs error is probably causing your car to drive crappy. knock sensor is under/within the intake manifold 'loop' on the intake side of the engine. it's a bitch to get to. try cleaning/tightening/resoldering the engine grounds that are connected to the engine on the upper right side of the valve cover by the firewall. sometimes that clears it up.

01-24-2006, 01:08 AM	#5
kazuo Post Whore! Join Date: Aug 2002 Location: Posts: 2,762 Trader Rating: (3) Feedback Score: 3 reviews	Ground to the MAFS, I assume. Ground the MAF to the chassis, see if that solves your problem. Check the plug to see if the ground wire is corroded/grounding itself out/backing out/etc etc Also check the wire itself all the way back to the ECU to ensure its not frayed and grounding itself out somewhere. Good luck

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