|
04-07-2010, 04:44 AM | #1 |
I've made a post!
Drives: Vitz 2003 1.3 CVT Join Date: Apr 2010
Location: New Zealand
Posts: 1
|
Knocking / Pinging
Hi everyone
I just purchased a new second hand import from Japan Toyota Vitz 2003 facelift model 1.3 with CVT Transmission. It has 60,000ks on it and is in immaculate condition. When at low revs /under stress when travelling under 70kmh the engine makes a pinging sound. When we put it into sports mode (increases the revs by approx 600) the problem goes away. I have tried a tank of both low and high octane fuel and it has made little difference. Is it a problem with the valves? Any thoughts much appreciated. Cheers |
04-07-2010, 10:19 AM | #2 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
|
Light pinging is normal for the Yaris/Vitz/Belta. The engine's knock sensor will pick it up and let the ECU know to retard the spark a bit before it reaches a harmful level. An engine's most efficient spark timing tends to be right at the onset of detonation under many operating conditions.
|
04-07-2010, 12:14 PM | #3 |
Banned
Drives: '10 Yaris5drHB+99 4runner LTD Join Date: Sep 2009
Location: NE
Posts: 672
|
probably full o carbon. yank the head and clean the combustion chamber of carbon buildup.
|
04-07-2010, 02:19 PM | #4 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
|
No way are those combustion chambers full of carbon at 60,000 kilometers unless that engine's been grossly malfunctioning. Black smoke sort of bad running. A brand new Yaris will ping lightly in normal operation.
|
04-07-2010, 02:24 PM | #5 | |
Banned
Drives: '10 Yaris5drHB+99 4runner LTD Join Date: Sep 2009
Location: NE
Posts: 672
|
Quote:
and stiff grades. knock sensor works. octane is 87 |
|
04-07-2010, 07:39 PM | #6 |
Drives: '08 Yaris LB 5M Join Date: Nov 2008
Location: MN
Posts: 31
|
My '08 has a light quiet diesel-like clatter when peaking the instant MPG on the highway. I assume I'm hearing pre-detonation (light pinging) The Chrysler powertrain engineers used to tell me that "pinging is the sound of fuel economy". More recently I was told by a Ford powertrain engineer that "pinging under light loads hurts nothing but pinging under heavy loads will destroy things". I'll let you know if my motor grenades.
|
04-08-2010, 10:38 AM | #7 |
Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008
Location: New Hampshire
Posts: 622
|
Make sure plugs are tight and correct heatrange. Engine can get carboned up by easy driving - a steam drink of 1/2 L hot water at 3000 RMP >SLOWLY< in through a vacuum hose behind the TB but into the manifold log will decarbon the engine better than any solvent. Just go VERY slow. maybe 5mins to drink the 1/2 litre.
|
04-08-2010, 04:06 PM | #8 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
|
Your ears likely aren't good enough to hear the light pinging, else you aren't recognizing it. It's there. It's subtle. The knock sensor does work.
|
04-08-2010, 04:11 PM | #9 |
Banned
Drives: '10 Yaris5drHB+99 4runner LTD Join Date: Sep 2009
Location: NE
Posts: 672
|
yaris does sound like a little buggy. perhaps that is where the little buggy sound comes from. it is nothing like 'real pinging' you'd get from a crappy 1981 chevy citation climbing a steep hill
|
04-08-2010, 05:17 PM | #10 |
Drives: 2008 yaris, stripped, red Join Date: Jan 2009
Location: SE Texas
Posts: 977
|
try running midgrade or premium.
|
04-08-2010, 05:32 PM | #11 |
Drives: NONE Join Date: Oct 2008
Location: NOWHERE
Posts: 95
|
Try another brand of gasoline just for the heck of it.
|
04-08-2010, 06:12 PM | #12 | |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
|
Quote:
On really unusually lugging mine down, on occasion I've heard about three distinct knocks (still on the light side) before the ECU retarded the spark. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
rear suspension making knocking noises | jookybanana | Wheels, Tires and Suspension Forum sponsored by The Tire Rack | 12 | 08-18-2011 01:00 PM |
Strange knocking in Engine :( | IvanG | DIY / Maintenance / Service | 10 | 09-28-2009 08:06 AM |
Pinging belt when wet or cold | steveh74 | Europe (continental) | 0 | 08-22-2009 05:50 AM |
Yaris making knocking noise | Wass | General Yaris / Vitz Discussion | 5 | 12-02-2008 03:37 PM |
engine knocking when accelerating | hans_fh | General Yaris / Vitz Discussion | 15 | 07-04-2007 02:13 AM |