ZR-1 Net Registry Forums - View Single Post - Takes a long time to start after sitting in the cold weather ---

Paul Workman · 12-24-2012

Well, 6 seconds seems a bit on the long side. Mine is about 3-4 seconds AFTER the fuel rail is charged.

Before rolling the ignition switch over to START, turn the switch to the "ON" position and listen to the fuel pumps. When they stop running, the rail is up to pressure, but it takes maybe a couple seconds before the rail (on my 90) is up to pressure. If I roll to the START position before the rail is charged, I can see how that might invite a backfire (NOT GOOD) at the very least. But, also add a second or two to the normal 3-4 second (cold) start time.

Once it has been started and run that day, the start time is much quicker - sometimes under a second!

And, if nobody told you, you want to hold the switch in the START position for almost another second after it fires to let the motor rpm start coming up. This avoids backfires which tend to blow hoses off the MAP and the Fuel Pressure Regulator (for starters) at the very least, or rupture diaphrams in said parts (rare, but happens). This trick might avoid a plenum pull to re-connect a vacuum hose. Just sayin...

P.

12-24-2012	#5
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Takes a long time to start after sitting in the cold weather --- Well, 6 seconds seems a bit on the long side. Mine is about 3-4 seconds *AFTER the fuel rail is charged*. Before rolling the ignition switch over to START, turn the switch to the "ON" position and listen to the fuel pumps. When they stop running, the rail is up to pressure, but it takes maybe a couple seconds before the rail (on my 90) is up to pressure. If I roll to the START position before the rail is charged, I can see how that might invite a backfire (NOT GOOD) at the very least. But, also add a second or two to the normal 3-4 second (cold) start time. Once it has been started and run that day, the start time is much quicker - sometimes under a second! And, if nobody told you, you want to hold the switch in the START position for almost another second after it fires to let the motor rpm start coming up. This avoids backfires which tend to blow hoses off the MAP and the Fuel Pressure Regulator (for starters) at the very least, or rupture diaphrams in said parts (rare, but happens). This trick might avoid a plenum pull to re-connect a vacuum hose. Just sayin... P.