GEO Engine >> LACK OF POWER/REVISED LIFTER

GEO Engine >> LACK OF POWER/REVISED LIFTER

Lack Of Power On
1989-92 GM 1.0L Geo Engines

AERA members report lack of power or stalling shortly after start-up on some 1989-92 GM 1.0L Geo Metro vehicles. Revving the engine shortly after starting or continued high RPM aggravates the problem. This condition occurs on an existing engine or immediately after cylinder head installation.

If all other valve train components meet specifications and the problem still exists, the valves may not be closing completely. This may be due to high pressure building up in the hydraulic lifter assemblies caused by the lifter's inability to bleed oil quickly enough.

To correct this problem, replace the hydraulic lifter assembly with revised lifter Part #17106263 with a faster bleed down rate. Varnish build up within a used lifter may also prevent the lifter to bleed down, thus holding valves open. To prevent this from occurring replace all lifters previous to VIN breakpoints N6761709 and NK211827.

The AERA Technical Committee

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