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Toyota Avensis Missing

Tiny
ICEMANROB
  • MEMBER
  • 1998 TOYOTA AVENSIS
  • 4 CYL
  • FWD
  • MANUAL
  • 174,000 MILES
I have a 1998 toyota Avensis GS Estate. When it gets warmed up it misses when I get to certain speeds in certain gears. E.G. 2nd gear 30mph, 3rd gear 45mph, 4th gear 60mph and 5th gear 75mph. I have replaced the ignition leads and spark plugs, but it still does it. Help would be appreciated.
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Saturday, April 2nd, 2011 AT 4:48 PM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the Check Engine Light indicating? If vehicle is equipped wit EGR, that might be the cause because the problem seems to be rpm related.
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Saturday, April 2nd, 2011 AT 11:27 PM
Tiny
ICEMANROB
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  • 4 POSTS
Hello, there are no dashboard lights showing, I wondered whether it might be the catalytic converter that was causing the problem as it only happens after the car has warmed up and been running for a little while.
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Sunday, April 3rd, 2011 AT 2:40 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If it is the catalytic converter that is clogged, the engine would lose power at higher rpms so I believe it is not the cause.
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Sunday, April 3rd, 2011 AT 7:34 PM
Tiny
ICEMANROB
  • MEMBER
  • 4 POSTS
Hello, I am still experiencing the same problem sometimes to a greater extent. This is the full synopsis so far:-

Power loss when warmed up, starts around 3,400rpm and decreases to as low as 2,500rpm sometimes. The power just cuts and the car will start to kangaroo/miss unless you bring it back down below the threshold. The power loss can be replicated with the car stood still and the accelerator pressed to the threshold point.

It always seems hot in the front of the car when warmed up, noticeably around the centre console, stereo area. Even when the temperature selector is on cold.

There is a little coolant loss, topping up the expansion tank approx. Every 5 days.

Items replaced so far :
Plugs
HT Leads
EGR Valve (vacuum advance)

Any further help would be greatly appreciated.

Regards

Robert
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Thursday, September 29th, 2011 AT 1:27 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Even though the MIL is not indicating, there sould be some trouble code. I would suggest getting a scan done to check first.

Most parts stores provides free scanning services.

If nothing is found, then you would need a scan tool to monitor ther various sensors.
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Thursday, September 29th, 2011 AT 1:35 PM
Tiny
ICEMANROB
  • MEMBER
  • 4 POSTS
I took it to my local Toyota main dealer to have them check it with their diagnostics and it showed nothing, I did wonder if it might be the MAF or MAP sensors?
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Thursday, September 29th, 2011 AT 1:53 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Since they had the scan tool on, they should have monitored the various sensors and if anythng was wrong, it should have been noticed.

As no codes are found, you would have to perform mechanical checks. Cheeck if the exhaust system is clogged fr a start.
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Thursday, September 29th, 2011 AT 2:59 PM

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