Hi. I have a 1994 HDJ 80, with 1HD-T engine and A442F automatic gearbox.
A few months ago, the engine-gearbox set started trembling wildly at idle. It does so when the engine is at work temperature but relatively hot, for example after a motorway cruise or a demanding 4x4 session (e.g. a sandy stretch). In these conditions, the problem seems aggravated by additional small demands, for example maneuvering to park. High summer temperatures make everything worse, which suggests that the issue is linked to engine temperature.
That said, the engine does not overheat at all. Idle is regulated at 650 rpm, and the trembling is relieved by pressing the throttle, say, to 1000 rpm. The engine is quiet as a pool table right after starting from cold or while little is requested from it (e.g. errands on the street).
There are no problems of performance associated with this issue. The engine sounds well otherwise, which leads me to discard injection problems. An inspection of engine mounts (which were replaced shortly before this started) or silentblocks did not reveal any significant crack. A friend has suggested possible problems with the torque converter, but diassembling and inspecting it is a tall order unless more specific information is available.
I would really appreciate any insight on what might be the cause behind this trembling.
A few months ago, the engine-gearbox set started trembling wildly at idle. It does so when the engine is at work temperature but relatively hot, for example after a motorway cruise or a demanding 4x4 session (e.g. a sandy stretch). In these conditions, the problem seems aggravated by additional small demands, for example maneuvering to park. High summer temperatures make everything worse, which suggests that the issue is linked to engine temperature.
That said, the engine does not overheat at all. Idle is regulated at 650 rpm, and the trembling is relieved by pressing the throttle, say, to 1000 rpm. The engine is quiet as a pool table right after starting from cold or while little is requested from it (e.g. errands on the street).
There are no problems of performance associated with this issue. The engine sounds well otherwise, which leads me to discard injection problems. An inspection of engine mounts (which were replaced shortly before this started) or silentblocks did not reveal any significant crack. A friend has suggested possible problems with the torque converter, but diassembling and inspecting it is a tall order unless more specific information is available.
I would really appreciate any insight on what might be the cause behind this trembling.
