Poor acceleration

1999 HOLDEN ASTRA
210,000 MILES • 1.8L • 4 CYL • FWD • AUTOMATIC
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THAGODFATHER
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Changed plugs fuel filter and O2 sensor already.
Very poor acceleration and hesitation when engine warms up. Goes great cold. But slower than grandpa on a sunday drive once warm.
The fuel filter was exceptionally dirty and collapsed. But i think when it is cold if injector was blocked temperature would not matter. Same with low fuel pump voltage and vacuum. Maybe air sensor intake dirty. Only goes well if I super lightly accelerate as in, rest my shoe on it lightly. Need help my misses is on my tail to fix it.
Dec 17, 2016 at 5:11 PM
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STRAILER
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Hey,

This sounds like the catalytic converter is plugged up. Here is a test that will help you determine if the cat is plugged.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Let me know what you find.

Best, Ken
Dec 20, 2016 at 11:07 PM