Rough running - ZR-1 Net Registry Forums

Billy Mild · 07-18-2016

Let me preface this post with the dilemma I'm in, daily driver Jeep CRD is out of commission due to a trusted out diesel tank, 2 motorcycles are out of service 1 with a seized engine and the other cosmetic issues, and now the Vette has decided to run a little rough.

On the highway the ZR1 seemed to almost fight against itself, but if I go full throttle the Lt5 pulls just fine. The car would buck or almost feel like it was going to die but if I have the car more throttle it would pull without hesitation.

It is happening at low rpm sub 3000 RPM. Something that I also noticed is that the speedo quits working randomly.

Could this be a fuel pump problem? Spark plug issue?

Fuel injectors, coil packs, and wires have been replaced in the last 2 years. I have SW headers and new O2 sensors with a Marc Haibeck tuned chip.

Sent from my Nexus 6 using ZR-1 Net Registry mobile app

07-18-2016	#1
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	Rough running (UPDATED) Let me preface this post with the dilemma I'm in, daily driver Jeep CRD is out of commission due to a trusted out diesel tank, 2 motorcycles are out of service 1 with a seized engine and the other cosmetic issues, and now the Vette has decided to run a little rough. On the highway the ZR1 seemed to almost fight against itself, but if I go full throttle the Lt5 pulls just fine. The car would buck or almost feel like it was going to die but if I have the car more throttle it would pull without hesitation. It is happening at low rpm sub 3000 RPM. Something that I also noticed is that the speedo quits working randomly. Could this be a fuel pump problem? Spark plug issue? Fuel injectors, coil packs, and wires have been replaced in the last 2 years. I have SW headers and new O2 sensors with a Marc Haibeck tuned chip. Sent from my Nexus 6 using ZR-1 Net Registry mobile app __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration Last edited by Billy Mild; 02-25-2017 at 11:58 AM.