Subject	Cold or Warm Up Hesitation
Posted by	Red5 on December 15, 2007 at 11:47 AM
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Message	Hesitation Diagnosis. What’s the fix? Anyone see this? 1991 ZXTT, 110,000 miles, Stage 1 Mods Cold Hesitation has been isolated to the timing remaining at 15-16 degrees from a coolant temperature of 70F to 130F. Once 130F has been reached, then the timing advance works fine. Below 70F the timing advance works fine. The problem is consistent.(I'm the original owner. This behavior was not present in it's younger days.) Workup thus far has included all the usual things. Connectors, plugs, fuel system, MAF checks, Boost leak checks, Replace TPS and Engine Coolant Sensors, New Fuel pump, Filter, 1 Mega ohm resistor across the Knock sensor connector, disconnecting and replacing the O2 sensors. CAS looks and functions OK on bench testing. Splines and cam shaft look fine. PTU replaced previously on the recall. ECU only throws code 55. Some members in the past have described a combination cold and warm hesitation when just slightly off throttle in the past. This occurs at the moment the closed throttle position sensor just goes off. ConZult software shows a 5ms timing dump at that point. For those of you who have ConZult software I have a cold start lightly loaded drive off profile I can E-mail you. Anyone have any ideas, experience?
Follow Ups	Cold or Warm Up Hesitation - Red5 11:47:35 12/15/07 Have you ohm tested your injectors? - spicyZ 12:53:05 12/15/07 Re: Have you ohm tested your injectors? - Red5 15:40:15 12/15/07 If it only slightly hesitates a little, it's normal until - Nissan GTR 08:44:15 12/16/07 Re: If it only slightly hesitates a little, it's normal until - Red5 10:15:29 12/16/07
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