PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Out of Ideas, Need Help !!

Old Jul 1, 2011 | 07:22 AM
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My Predator still shows very high LTFT's (~ 20) using factory tune loaded. I have pulled the intake and put it back with new gaskets/seals, redone the complete pcv system, repaired the brake booster hose, and pretty confident that I do not have any vacuum leaks.

What else can cause the high LTFT's? Could a bad O2 sensor or cat casue this? Could the PCM itself have an issue?

Get a random P0174, P0101, and some Cat code, but infrequently.

Car has SLP lid, BBK 80mm TB, BBK SSI intake, and flowmaster welded into to stock SLP SS exhaust. Other than that, stock. Air systme removed, but did this before that was done.

This is getting frustrating.

Jon
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Old Jul 1, 2011 | 09:41 AM
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Dirty MAF. Low fuel pressure.
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Old Jul 1, 2011 | 12:42 PM
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MAF is clean, need to check fuel pressure.

Jon
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Old Jul 1, 2011 | 04:56 PM
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Unplug the MAF and get it in closed loop then monitor fuel trims. What happens to the fuel trims?
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