TPS failure - ZR-1 Net Registry Forums

secondchance · 02-08-2015

About 2 weeks ago my Z started to miss badly around 2500 to 3200 rpm. Since I Threw in a set of old FR2LS plugs after the the rebuild, I replaced plugs with NGK Laser iridiums. That had no effect. So, I tried another MAP sensor I had - still no fix. So, I was figuring either bad coil/coils or secondary fuel pump. However, I noticed miss was occurring immediately after cold start before being fully warmed up - may be not a fuel pump issue... What was interesting was that the miss would star exactly at same rpm range - between 2500 to 3200 rpm. This led me to suspect flat spot on the TPS sensor. Replaced it and sure enough, she runs fine!
I will confirm this later when I can hook up Jim's Tech 1 but I suspect voltage reading will start at .54 volts and as accelerator pedal is depressed progressively, voltage increase would drop or go to zero and then pick back up.
Thought I would share this other Z owners for future reference.

02-08-2015	#1
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,726	TPS failure About 2 weeks ago my Z started to miss badly around 2500 to 3200 rpm. Since I Threw in a set of old FR2LS plugs after the the rebuild, I replaced plugs with NGK Laser iridiums. That had no effect. So, I tried another MAP sensor I had - still no fix. So, I was figuring either bad coil/coils or secondary fuel pump. However, I noticed miss was occurring immediately after cold start before being fully warmed up - may be not a fuel pump issue... What was interesting was that the miss would star exactly at same rpm range - between 2500 to 3200 rpm. This led me to suspect flat spot on the TPS sensor. Replaced it and sure enough, she runs fine! I will confirm this later when I can hook up Jim's Tech 1 but I suspect voltage reading will start at .54 volts and as accelerator pedal is depressed progressively, voltage increase would drop or go to zero and then pick back up. Thought I would share this other Z owners for future reference.