Question about Toyota Cars & Trucks
Engine has vibration/shudder just above idling.
Start with a compression test to determine if there is a weak cylinder or imbalance . the stalling could be fuel related... check pressure and change the fuel filter. more info is needed...... lots of vacuum lines and emissions controls, are the all there? is there a vacuum leak somewhere like the intake, pcv, throttle body or plastic tee?
Posted on Apr 01, 2014
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Posted on Jan 02, 2017
Check the EGR Valve for stuck open condition with a vacuum pump.
If at idle you apply vacuum and it gets worse and shuts down or shutters, then that's not the problem. But, if you apply vacuum and there is a leak, there is a bad EGR valve on the car. If you apply vacuum and it operates the EGR and there is no change then the EGR should still be removed and the pintle cleaned, or a new EGR Valve should be installed.
Also, a coil pack could be causing this condition, where not enough spark gets to the spark plugs.
Is this a 4 tech or quad 4 engine?
Also, the cylinder head gasket could be burned through and allowing one cylinder to bleed exhaust to another cylinder on the Quad 4.
Good luck with this.
Posted on Jul 13, 2010
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