I am having trouble with a code 34. I clear the ECU and straight away I have a code 34 when I drive off. How the sensor id meant to be pretty sensitive from what I read on it. Here's my thought......I've got forged pistons and they rattle like hell when the engine is cold. This rattle is probably 3/4 as load as a bad ping. Could the Det Sensor be reading this rattle as a ping and sending the ECU into safety mode??? I run 98 octane ALL the time. My timing is set 2 degrees more RETARDED than factoty. I am running 14 lb boost with jets.....but is goes to safety before it boosts anyhow. The car is auto. Your thoughts.
code 34... dude, a code 34 does not mean that your car is pinging. All it means is that there is something wrong with the DET sensor circuit. There are no error codes for detonation. The only way you know you are pinging is if you hear it, if your engine blows up, or you get thrown into safety boost without a code 34.... If you are getting a code 34, your DET sensor or wiring is buggered and will need to be replaced or bypassed to get out of safety boost... Cheers
Why is the timeing retarded? code 34 all the time,could be temp sensor screwed, det sensor screwed ect, retarding the timeing could also cause pre-ignition!
Could someone please confirm or deny this as i think it is wrong, why would they have a det sensor, hook it up to the ecu and have the only purpose of the wiring to tell the ecu if its not working, its ridiculous, your post is misleading, the most common cause of the error is that the wiring or det sensor is stuffed but when all working properly the det sensors purpose is to tell the ecu if the car is detonating and if it is put into safety map
I'm open to new ideas...but I can't understand how retarded timeing can cause pre-ignition. I have only retarded the timeing 2 degrees to be a bit on the safe side. if at full advance the timeing is normally say...32 degreees...mine is 30. Not much difference really. But in any case it is 2 degrees later, not earlier...so this should not cause early ignition to my way of thinking. If I have missed something....pls explain.
ok, the det sensor is used by the ecu to retard timing when pinging is detected.. pinging occurs due to amient temps changing, bad fuel etc.. you should not hear the pinging, the ecu takes care of it.. if the det sensor is faulty the ecu can no longer perform this task and records an error retarded ignition will not cause pinging, it will increase your exhaust gas temps however (can cause hot spots on exhaust valves and pre-igntion in severe cases).. too advanced timing will cause pinging (flame front (ie max cylinder pressure) occurs before the piston hits TDC) once again,det sensors do not throw error codes when they register pining.. reading pinging is not an error.. its its job! errors occur when somehting is broken, if its registering pinging, the ecu retards timing and everything is working..
Missed something No i did! so the cars timeing was set to 13deg from 15deg, offcourse thats not gunna cause any pinging, just a little extra fuel being burnt, a little less power, and more exhaust emissions. Buypass the det sensor, and clear the code. Im sure its not going to detonate @13deg! the det sensor is most likely cooked anyway.
Pinging is "not" pre-ignition...it's detonation closely related but entirely different occurances. Secondly error-codes are just that...codes sent to you by the ecu letting you know there is a problem. When o2's get lazy theres no error code, when CTS registers the wrong temp due to bad connectors there's no code...only when the signals from these sensors don't get through is there a error code generated. The Det sensor will through you in and out of the knock map every time it sensors detonation. It will "only' throw a code if there is no sensor detected, or a damaged sensor with the wrong resistance. The vibrations generated by your pistons generally aren't of the right frequency for the sensor to register as detonation anyhow. If you have a code 34 it's because of te sensor. Pre-Ignition is when the mixture ignites before the spark, generally due to hot-spots caused by detonation or lean running. Pre-ignition will melt holes in piston in seconds...the amount of heat generated when an already ignited mixture then get compressed is phenomenal.
hehehhe nah man, no way..... I dont get offended over forum posts... Text on screen (ie my replies) can sometimes come across as being a bit direct and abbrasive..... I forgot to use my smiley faces... Cheers
Elaboration The detonation sensor circuit has a certain resistance range when working properly. When the ECU finds a resistance reading outside of the normal range (lets say a broken wire in the circuit, short circuit, or faulty detonation densor itself), a code 34 is generated. That's why the Detonation sensor bypass is effective in so far as a fixed resistor is placed over the terminals that the ECU reads. So a Code 34 is a circuit fault in either the Detonation sensor wiring or the sensor itself. You will need to either Check and fix the wiring Check and buy a detonation sensor and get it fitted $$$$$$$$ Perform the bypass as many of us including myself have done (get your AFRs checked afterwards!!!) That's my $0.02
