Wierd ping or tick under load.

[vdragonmpc]

Ok I am starting to go mad.

I had a heat issue in the summer where the trans hump seemed overly warm but manageable. I figured I needed a trans cooler or something to deal with that.

Well a couple of weeks ago when the weather changed my supra developed an odd ping sound that increases under load when I give the car the gas. It does NOT do it in park or neutral. I changed the plugs and the #4 (4th from timing cover) spark plug was fouled somewhat. I also just realized that they didnt change the plugs when I had the BHG 2 years ago (go figure Priority)

What could this be? Its driving me nuts. The car has good boost (I am at stock until I figure it out) and power It revs good and idles fine along with good temp and oil pressure. I also changed the oil a bit before this started.

The ping sounds like when you run your fingernail over a comb. I also thought my exhaust sound was louder under the hood suddenly like I had a hole somewhere... I think I am just getting paranoid after seeing the posts about the EGR gasket..

V

 

[sneakypete]

check for exhaust leaks first. when you changed the oil, did you notice anything unusual about the oil? i noticed symptoms similar to the noise you heard on my motor when it was in the early stages of rodknock.

 

[vdragonmpc]

check for exhaust leaks first. when you changed the oil, did you notice anything unusual about the oil? i noticed symptoms similar to the noise you heard on my motor when it was in the early stages of rodknock.

Nope the oil was dirty and had the same used smell as always. no fun stuff. It just started ticking about a week ago. You can rev all you want in park and neutral no tick. Put it in gear and you hear ticking under load its hard to track because it seems to happen when the car is moving.

V

 

[Poodles]

Exhaust leak (that includes EGR)

 

[vdragonmpc]

Exhaust leak (that includes EGR)

How can I check the EGR to see if its leaking? Why would it only do it under load and not when Im under the hood revving?

<Im not riding down the road under the hood. Its been done and Im too old for that action>

V

 

[grimreaper]

The EGR only opens when under load or cruising so it doesnt stall the car.
Hook up a vacumm line to the egr valve and it will open it, usually have it a little reved up so it does not stumble to bad(2k rpm probably)
If u power brake it will it make the noise? Not to the point of spinning the tires but enough to load it up. If so have somone do it for u while u are under the hood. (make sure parking brake is and foot hard on BRAKE)

Also are you sure its not just detenation? Maybe u put in the wrong gas or just got some bad gas?!

fixed

 

[Dr Chill]

fixed

I was wondering about that :icon_bigg

 

[vdragonmpc]

The EGR only opens when under load or cruising so it doesnt stall the car.
Hook up a vacumm line to the egr valve and it will open it, usually have it a little reved up so it does not stumble to bad(2k rpm probably)
If u power brake it will it make the noise? Not to the point of spinning the tires but enough to load it up. If so have somone do it for u while u are under the hood. (make sure parking brake is and foot hard on gas)

Also are you sure its not just detenation? Maybe u put in the wrong gas or just got some bad gas?!

Well I checked my turbo gasket bolts on the downpipe and they were tight. I swear my exhaust is leaking under the hood somewhere but I took a mirror and peeped all over and cant see anything. I am going to run cleaner through the system tomorrow and burn out this tank of gas with octane boost.

It really comes from the back 2 cylinders it seems. Now it does it under regular rev.

Whats insane is after the tuneup and new o2 sensor the car has great power.

 

[vdragonmpc]

Exhaust leak (that includes EGR)

I have a sensor on my water neck that has gone bad. I think its the cold start injector sensor (middle top with electric wires coming out of it)

I think the tick is in the head now. It ticks in neutral now.. Im putting cleaner/octane boost in as Im thinking I may have bad gas. But could that water neck sensor cause the tick now that the weather is so cold?

V

 

[Poodles]

Could still be the EGR cooler gasket as the cooler is BEFORE the EGR valve so it always has exhaust going to it (unlike what was previous said in this thread).

Once it blows out enough from load it will leak all the time.

What exact sensor is disconnected?

 

[sneakypete]

its real hard to tell if the EGR cooler gasket is blown since there is barely any clearance. good luck finding it and/or replacing it if that is the case.

 

[grimreaper]

smoke test it, sea foam it(cheap smoke test) , or hook an air line up to the tail pipe. any leaks should become easy to find (especially when cold)

 

[vdragonmpc]

smoke test it, sea foam it(cheap smoke test) , or hook an air line up to the tail pipe. any leaks should become easy to find (especially when cold)

Im going to try some redline fuel cleaner and see if its gas related. Plugs and wires are good but the o2 sensor I got was the wrong one. Looks like I will have to order one online or from Champion.

I will try the rag test tonight.

V