help needed code 33 MAP

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May 12, 2005 | 06:18 PM

JAYK

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Racer

Joined: Sep 2003

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From: NEWCASTLE

help needed code 33 MAP

Since rebuilding the motor with LPE heads cam and intake I am getting a code 33 MAP low vacuum fault .The pcm has been retuned ,car is idling better but still throwing code 33.I have a datamaster idling recording if anyone cares to take a look.I will record an actual test run tommorow and see if there is any change.What are the typical causes of low vacuum?anyone?

May 12, 2005 | 06:22 PM

CFI-EFI

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Joined: Sep 2000

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From: The Top of Utah

A big cam or vacuum leaks. What IS the vacuum reading on a gauge? Is the needle steady?

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May 12, 2005 | 06:28 PM

JAYK

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Racer

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From: NEWCASTLE

between 70-80KPa ,jumps around a bit

May 12, 2005 | 07:49 PM

CFI-EFI

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From: The Top of Utah

You have a kpa gauge? What's that in English? My head hasn't been recalibrated to metrics. The jumping could be the cam or a valve problem.

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May 12, 2005 | 07:55 PM

JAYK

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Racer

Joined: Sep 2003

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From: NEWCASTLE

between 20 and 24 hg

May 12, 2005 | 08:22 PM

CFI-EFI

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Joined: Sep 2000

Posts: 17,298

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From: The Top of Utah

Assuming the 20-24 HG is from a gauge, that is abnormally high, even without a cam. Code 33 indicates a high voltage signel sent which comes from low vacuum. 20-24 hg is hardly low. I would test both the Map sensor and the TPS for proper operation. Then the wiring for both. DAMN, that's high idle vacuum!

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