got detonation - Toyota Nation Forum : Toyota Car and Truck Forums

carcatz · 11-23-2004, 07:40 PM

I've got occasional detonation at high rpm (stock boost)

any one got any hints

JekylandHyde · 11-23-2004, 08:34 PM

What symptoms are you having?

I suspect you are sputtering under boost? ... if so, buy yoursef new TOYOTA cap/rotor/wires and some fresh plugs.

carcatz · 11-23-2004, 09:17 PM

it sounds like pinging when I get to the top of the gear, ve heard detonation in a grand national I had this is not so loud, it seems to have started after they were replaced?
yes got new wires cap rotor plugs

carcatz · 11-23-2004, 09:18 PM

the plugs, cap, rotor ,wires

JekylandHyde · 11-23-2004, 09:19 PM

You're in Mass ... is it cold up there? ... are you trying to push the car before it is up to temp?

carcatz · 11-23-2004, 09:30 PM

yes its cold but I was on the highway today for a while and was merging on to another highway when I down shift and topped out the gear it would rattle a little not loud, very faint. Engine is up to temp.

TekPhobia · 11-23-2004, 09:35 PM

So what's your timing at?

-Tim

carcatz · 11-23-2004, 09:38 PM

not sur ejust had timming belt replaced, thought knock sensor would take care of ping if it occoured, no lights either. What should it be at?

JekylandHyde · 11-24-2004, 06:00 AM

It really doesn't sound like you are getting knock.
Because of the MR2s very sensitive knock sensor, it starts retarding timing and increasing fuel delivery long before knock would be audible.

If you expereince knock in an Mr2, it is usually felt ... it feels like you are accelerating against a wall of wind ... kinda like trying to run in a pool. The retarded timing just feels like resisitance.

If you are hearing something, it sounds like you have something else going on.

carcatz · 11-24-2004, 06:56 AM

yeah, I've heard it before like I said in another car it was much louder,I'll try to isolate the symptoms and let you know?

carcatz · 11-24-2004, 04:15 PM

I tried it today and listened a little closer it sounds like the tin is rattling!

carcatz · 11-30-2004, 12:24 PM

I was wondering if the knock sensor is broken will the computer react?

JekylandHyde · 11-30-2004, 02:10 PM

Yes.

You will be stick in limp mode as long as Code 52 is present.

carcatz · 12-05-2004, 09:40 PM

I'm thinking it is detonation I am going to try to check my codes, it only happens when the car is warm like when I boost it alot. Looking into a spawl fan for now and GM knocksensor???? I hope that is in the right direction????