block learn down to 119 - ZR-1 Net Registry Forums

ZR1 MK · 09-02-2005

My block learn readings have been dropping from the ideal 128 to 123 on the left side and 119 on the right side for the past 3 years. Intergrator is 128 each side. Throttle response wasnt as crisp after the headers, but its gotten a little worse. All, such as fuel pressure, plugs etc check ok. The primary injectors and oxygen sensors are original at 38k miles. I plan to reverse the left and right o2 sensors to see if its a sensor issue.
Any other idea?
Could the primary injector performance drop off gradually without a full failure?

Z Factor · 09-04-2005

Quote:

Originally Posted by ZR1 MK

Could the primary injector performance drop off gradually without a full failure?

I would say yes to your question regarding the primary injectors. I had a similar experience before a total failure on one of my injectors.

That is not to say it couldn't be something else, but an injector can start to have it's spray reduced or increased prior to going completely bad.

09-02-2005	#1
ZR1 MK Join Date: Aug 2005 Location: NY Posts: 143	block learn down to 119 My block learn readings have been dropping from the ideal 128 to 123 on the left side and 119 on the right side for the past 3 years. Intergrator is 128 each side. Throttle response wasnt as crisp after the headers, but its gotten a little worse. All, such as fuel pressure, plugs etc check ok. The primary injectors and oxygen sensors are original at 38k miles. I plan to reverse the left and right o2 sensors to see if its a sensor issue. Any other idea? Could the primary injector performance drop off gradually without a full failure? __________________ Mike 427 cu in LT5 [URL="http://zr1mk.weebly.com"]http://zr1mk.weebly.com[/URL]