MAP sensor issue - ZR-1 Net Registry Forums

secondchance · 01-22-2013

For the last two weeks or so my Z has been running ok but just felt a little grumpy – a bit of hesitation as I depress the gas after coasting and bit of hesitation if I depress the gas in 4th around 25-29 mph and too lazy to down-shift. Also, high speed coasting, say high speed exit ramp doing 55 mph or so, motor cut out on me twice. She was running ok but I could sense she was not quite at her best.
So, I suspected bad plugs perhaps and ordered a set of plugs (actually two sets – a long story) and a new map sensor just in case.
On Sunday I removed the map sensor and discovered the hard plastic part of the sensor hose was so loose from the rubber fitting that it slipped right off. So I used a bit of Crazy Glue, zip tie and used high temp silicone around the shoulder between the rubber fitting and the plastic hose. This completely cured the symptom I was feeling - now she purrs like a tiger!
I concluded this loose connection between the rubber fitting and the hard plastic hose was such that the vacuum reading taken by the MAP sensor was constantly a little less than actual somehow resulting in lean mixture. In certain condition leaning was to a point of shutting off the motor.
Just in case someone is having a similar issue, I thought I would share this with all.

01-22-2013	#1
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,717	MAP sensor issue For the last two weeks or so my Z has been running ok but just felt a little grumpy – a bit of hesitation as I depress the gas after coasting and bit of hesitation if I depress the gas in 4th around 25-29 mph and too lazy to down-shift. Also, high speed coasting, say high speed exit ramp doing 55 mph or so, motor cut out on me twice. She was running ok but I could sense she was not quite at her best. So, I suspected bad plugs perhaps and ordered a set of plugs (actually two sets – a long story) and a new map sensor just in case. On Sunday I removed the map sensor and discovered the hard plastic part of the sensor hose was so loose from the rubber fitting that it slipped right off. So I used a bit of Crazy Glue, zip tie and used high temp silicone around the shoulder between the rubber fitting and the plastic hose. This completely cured the symptom I was feeling - now she purrs like a tiger! I concluded this loose connection between the rubber fitting and the hard plastic hose was such that the vacuum reading taken by the MAP sensor was constantly a little less than actual somehow resulting in lean mixture. In certain condition leaning was to a point of shutting off the motor. Just in case someone is having a similar issue, I thought I would share this with all.