Recently I noticed noise when I step on and let off the gas pedal. Its like something is loosen. But when I hit the brake pedal, I don't hear it. Its only when I step on the gas or let off the gas. Its just getting louder and louder. Any idea where to look at?
it could be that there is a leak in your exhaust. where is the sound comming from? you should get a friend you trust to drive slowly by you so you can probably get a better understanding of the problem.
Originally posted by danieldaniel it could be that there is a leak in your exhaust. where is the sound comming from? you should get a friend you trust to drive slowly by you so you can probably get a better understanding of the problem.
Originally posted by Deep Bad motor mount? When you're cruising along in 5th and you let off the gas then get back on it, does the shifter move back and forth?
Maybe its a bad motor mount. Is it expensive to replace or fix? I can hear the noise in 1st, 2nd, 3rd, 4th and 5th. Everytime I let off the gas, I can hear it. Or when I step on the gas, I can hear it again. Its not continuous. Its just that particular instant. My shifter doesn't move back and forth.
If your shifter is solid then its probably not a mount. Another thing to look at are the half shafts. A bad CV could caust a click/clunk noise. If you can inspect the boots to see if they're torn that may be an indicator, they're supposed to be sealed and full of grease, somtimes the boot tears and lets out the grease causing a CV failure. Have a look.
Q: The car knocks a little under boost and the power drops off suddenly,
The symptoms are that when running UK 95 Octane unleaded petrol, when accelerating the engine knocks (/pinks) and this is being detected by the engine knock sensor. In order to protect the engine the ECU retards the timing until no more knocking is detected. If the ECU is still detecting knocking at this point, it may go one step further and close the turbo VSV, to limit the boost to a lower, safer, value.
This often happens at around 5k rpm, and if accelerating hard with full boost there is a quite noticeable drop in power as the ECU closes the VSV and the boost level drops. This is probably caused as in Japan Unleaded fuel is either 98 or 100 octane.
The only cure is to retard the spark timing at the distributor: In my case, it had to be moved to 5 degrees BTDC, and the car will run 95 Octane unleaded, at the expense of a little top end power and affect cold engine performance.
Exhuast manifold leak or loose spark plug? Could also be a bad rod bearing.
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Ricers - Imitate, Racers - Originate.
1989 Corolla GTS -4agze propane (rebuilding ... again)
2005 Subaru Legacy (we'll see if if lasts as long as the Yota's)
2008 Yaris
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