HESITATION PROBLEM NEEDING HELP again - ZR-1 Net Registry Forums

Route 66 · 02-07-2012

I now have the vacuum leak fixed. It idles good.Thanks to the help I got from GOLDCYLON and some others on here.

Now Im working on a very slight hesitation if you try to accelerate quickly it hesitates slightly at the start of a quick acceleration, If you accelerate normally it work's ok... It was there before I replaced the injectors. I think it might be a sensor but not sure. I don't drive the car much so I can't remember how long it has been doing it. You have been great about giving good info in the past I hope you don't mind me asking again...................Thanks ..E

mike100 · 02-08-2012

The first and easiest thing to check besides large vacuum leaks (which it seems not to have anymore),would be the hose to the fuel pressure regulator. The fuel pressure should increase when you pull the hose. this is just like opening the throttle blades, pressure on the diaphragm should drop to atmospheric. it's like instantaneous acceleration enrichment.

tomtom72 · 02-09-2012

Yea, what Mike said!

I would also just do a check on the TPS. KOEO, with a DVOM connected to the TPS via a back probe ( I use telephone wire for the back probe ) and actuate the linkage and watch the volts to see if there is a dead spot in the TPS. I suppose if you had a scanner you could hook up and with the motor running watch an isolation of the response voltage from the TPS that way too.

Tom

02-07-2012	#1
Route 66 Join Date: Dec 2006 Location: Paris Texas Posts: 182	HESITATION PROBLEM NEEDING HELP again I now have the vacuum leak fixed. It idles good.Thanks to the help I got from GOLDCYLON and some others on here. Now Im working on a very slight hesitation if you try to accelerate quickly it hesitates slightly at the start of a quick acceleration, If you accelerate normally it work's ok... It was there before I replaced the injectors. I think it might be a sensor but not sure. I don't drive the car much so I can't remember how long it has been doing it. You have been great about giving good info in the past I hope you don't mind me asking again...................Thanks ..E

02-08-2012	#2
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: HESITATION PROBLEM NEEDING HELP again The first and easiest thing to check besides large vacuum leaks (which it seems not to have anymore),would be the hose to the fuel pressure regulator. The fuel pressure should increase when you pull the hose. this is just like opening the throttle blades, pressure on the diaphragm should drop to atmospheric. it's like instantaneous acceleration enrichment.

02-09-2012	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: HESITATION PROBLEM NEEDING HELP again Yea, what Mike said! I would also just do a check on the TPS. KOEO, with a DVOM connected to the TPS via a back probe ( I use telephone wire for the back probe ) and actuate the linkage and watch the volts to see if there is a dead spot in the TPS. I suppose if you had a scanner you could hook up and with the motor running watch an isolation of the response voltage from the TPS that way too. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member