Engine 96 gt hesitation on acceleration

Do you have an ODB2 scanner? If so, what are the LTFT's between idle and 2000 RPM's? Often an intake leak with have large positive LTFT's at idle that decrease at 2000 RPM's.

The other way I prefer to test for intake leaks is to use a propane wand to "probe" around joints looking to see if the RPM's change when the propane is ingested. I'm not a fan of spraying carb/choke cleaner to look for leaks (to each his own).

What have you done to rule out a problem with:

• The spark plug wires
• the spark plugs
• the fuel injectors
• the fuel pressure
• Base engine

Have you monitored fuel pressure or LTFT's during pulls? Often ignition related issues will become worse as engine load increases.

Have you cross checked the PCM reported ECT value against a reading with an infrared thermometer scanner?

What have you done to rule out a bad alternator diode?

What is the intake vacuum at idle and under load? What are the results of a compression test?

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ForScan ODB2 scanner w ELM327 USB

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