Author Topic: Knock Sensor (Read 1360 times)

85blackGT · « **on:** Sep 11, 2003, 09:38:08 am »

The knock sensor in my car its damaged i think,cause i was cleaning my engine,checking here and there and i saw something that looks like a coat hanger wire(heavy wire)and it was hanging in front of my knock sensor i pulled it and it came off and its just like wire all the way to the end like 5 to 7 inches i put it back,the car started normaly,its this normal or do i need a newone.

NightCelica · « **Reply #1 on:** Sep 11, 2003, 07:18:50 pm »

Does the car knock now? Does the engine have the same power or is there loss?
Does you check engine light come on? Have you checked of the self-diagnosis codes. To check for the codes: short the smae two wire that you short when you set the timing, but do not start the car just turn on the key, the "check engine" light will flash. The owner manual or the haynes manual will help you to understand the codes.
I'm assuming you own a 85 Celica right? because the earlily Celicas with EFI did not have a knock sensor. Some late 84 were of the 85 model.

85blackGT · « **Reply #2 on:** Sep 12, 2003, 06:43:57 am »

Why it there supose to be some knocking if its bad at all times or just sometimes,and yes my car is an 85 from the 85-95 family. No light so far only afther i start the car the light stays on for about 2 seconds.

wadadlianu · « **Reply #3 on:** Sep 12, 2003, 01:26:53 pm »

It wont knock unless you have another problem. The knock sensor is there to let the ecu retard the ignition if pinging is recorded in the engine. You probably need to check you code and see what code it recorded. That will let you know what faults are stored in your ecu. If none are there, then you probably do not have a problem

Bridge · « **Reply #4 on:** Sep 12, 2003, 05:23:56 pm »

I dont think my check light went on when i spun a rod bearing... it went on after the died... then i could start my engine back up and thats when i knew my rod bearing went out... my engine still would run and drive with a messed up rob bearing.

wadadlianu · « **Reply #5 on:** Sep 12, 2003, 05:34:15 pm »

Yeah but thats not what your knock sensor is there for. It is a preventative measure against detonation or pinging. this is a combustion issue while your rod knock is from your bearings "spinning" Your ecu will only read certain faults. Just depends on how many/type of sensors and parameters

Bridge · « **Reply #6 on:** Sep 12, 2003, 05:48:16 pm »

Thats crazy, i never knew anything about that knock sensor... and i've had my fair share of engine work and research into our cars... odd. oh well, thats what this forum is for, i guess i learned something!

wadadlianu · « **Reply #7 on:** Sep 12, 2003, 05:52:51 pm »

Yep we all have to help each other.

NightCelica · « **Reply #8 on:** Sep 12, 2003, 10:26:11 pm »

I not sure I never had a knick sesnor go bad. I was asking to help me diafnos your problem. Like stated aready the knock sensor is to keep the engine from destorying it-self.
Toyotas ECUs aleast the 85 and up will keep advancing the timing intill it senses knock than retards the timing and starts all over again.

toynado · « **Reply #9 on:** Sep 13, 2003, 08:30:53 am »

Quote

Toyotas ECUs aleast the 85 and up will keep advancing the timing intill it senses knock than retards the timing and starts all over again.

my owner's manual even says some pinging is o k

to which i say burn the freeking thing

altho i do need it to figure out how to roll up the window and stuff

i never ever get pinging
unless i get bad gas
utah gas...
very very bad
and it's not even a bean state