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Old 10-17-2013, 07:41 AM
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No power from turbo, could it be MAP sensor?

First off, this forum is awesome. I've spent about 20 hours searching and reading threads and I'm starting to get a hold of what this engine is all about. I'm no mechanic, but I've done my fair share of work on all my vehicles. Here is what I have going on:

2003 pure stock.

Symptoms: no power from turbo, shifts fine, runs fine downhill, but going up hill barely crawls.

I've already checked and/or eliminated as possible causes: Turbo (it's a new turbo, can't hear any leaks out of any hoses, CAC, cic.

On the scan gauge I'm getting fine FICM voltage, good icp, good vgt.

HOWEVER, the scan gauge shows -1.3 boost at all times, and 11.3 MAP at all times. I'm thinking this could all be the MAP sensor.

Would a bad map sensor cause the no power from turbo issue?
Would a bad sensor cause there to be a constant reading of 11.3 on the scan gauge?

I've spent a lot of time and cold nights on this thing, but I think I'm getting close. Thanks in advance.
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Old 10-17-2013, 08:20 AM
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After the first time I had my turbo out and back in I had a couple leaks and it just killed the turbo. And later I also found a very small leak on the egr valve its self. Have you had the system apart?
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Old 10-17-2013, 08:39 AM
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Yes, I've had it apart a few times. Each time with new seals.

How can I go about finding any leaks around the turbo? I don't hear anything, definitely can't see anything.

Is there a way to test/check for leaks?
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Old 10-17-2013, 09:34 AM
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While leaks are the most common cause of boost issues they aren't the only causes.
Out of range readings from a number of sensors can cause the pcm not to command the vgt solenoid properly. Physical problems with the turbo rust carbon build up that can make the unison ring stick or vanes stick.

Any one of these can cause problems.
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Old 10-19-2013, 10:53 AM
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With truck off, koeo look at map and baro. Should be identical readings. If they are, take the map hose off and use a paper clip to clean the nipple coming off the intake, and clean the map hose. It could be plugged. If they arent identical, then your map sensor probs needs to be replaced


Sent from AutoGuide.com App
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