EXHIBIT 31.2



CERTIFICATION



I, Thomas M. Costales, certify that:



I have reviewed this amended
annual report on Form 10-K/A of IMPCO Technologies, Inc. (IMPCO);



Based on
my knowledge, this amended annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this amended annual report;



Based on my
knowledge, the financial statements, and other financial information included in this amended annual report, fairly present in all material respects the financial condition, results of operations and cash flows of IMPCO as of, and for, the periods
presented in this amended annual report;



IMPCOs other certifying officers and I
are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and
15d-15(f)) for IMPCO and we have:



| | a) | designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to
IMPCO, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this amended annual report is being prepared;
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| | b) | designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
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| | c) | evaluated the effectiveness of IMPCOs disclosure controls and procedures and presented in this amended annual report our conclusions about the effectiveness of the disclosure controls
and procedures, as of the end of the period covered by this amended annual report based on such evaluation; and
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| | d) | disclosed in this amended annual report any change in IMPCOs internal control over financial reporting that occurred during IMPCOs most recent fiscal quarter (IMPCOs fourth
fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, IMPCOs internal control over financial reporting; and
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IMPCOs other certifying officer(s) and I have disclosed, based on our most recent evaluation of
internal control over financial reporting, to IMPCOs auditors and the audit committee of IMPCOs board of directors (or persons performing the equivalent functions):



| | a) | all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect IMPCOs
ability to record, process, summarize and report financial information; and
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| | b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the IMPCOs internal control over financial reporting.
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Date: November 21, 2005



/s/    THOMAS M.
COSTALESThomas M. CostalesChief Financial Officer and Treasurer