low rpm miss - ZR-1 Net Registry Forums

cloudshe · 06-09-2016

1995 55k mi zr-1 engine (perf chip) slight stumble. i've never had anything but smooth strong power since i bought the car, throughout the rpm/speed/throttle range. just recently it has a slight miss just when adding a little bit of gas pedal, around 2000 rpm. doesn't matter much what speed or gear, just happens when running steady state and then slightly increasing pedal pressure, seems a little worse after a few miles driving. no problems at all other modes, full throttle, half throttle, any rpm, valet mode on or off.

where to start? plugs, wires, injectors? do i need a code reader? i want the car to run perfectly when i sell it, i'm just not using it since i retired & main job now is driving wifey around in her sedan or suv. also, i'm working on restoring my dream mid-year

Thanks!!!

BYEBYE2U · 06-09-2016

Had same issue when i picked up my 95: turned out to be ignition wires
Run a timing light on all wires n see if you can visualize the miss at idle in a dark garage
.....n of course take the easy way out n start with plugs then wires n last coil packs
Wires tend to screw up even more when you throw water mist on them
Injectors are more than likely NOT the culprit ...you hope...

Mystic ZR-1 · 06-09-2016

Mine recently had the same symptoms,
Fuel pumps solved the problem.

cloudshe · 06-09-2016

thanks for those suggestions! wonder if lack of driving caused the problem, i probably haven't put on more than 100 miles in the last 2 years, many months none at all

cloudshe · 03-31-2017

changed the plugs, runs perfect all rpm's now!! thanks y'all for the suggestions! hate to sell it but wifey sez 1) i don't like to ride in it, you drive it too crazy 2) you never go anywhere by yourself anymore, so... 3) what about the '65 you're working on?

cloudshe

06-09-2016	#1
cloudshe Join Date: Mar 2011 Location: grasonville, md Posts: 33	low rpm miss 1995 55k mi zr-1 engine (perf chip) slight stumble. i've never had anything but smooth strong power since i bought the car, throughout the rpm/speed/throttle range. just recently it has a slight miss just when adding a little bit of gas pedal, around 2000 rpm. doesn't matter much what speed or gear, just happens when running steady state and then slightly increasing pedal pressure, seems a little worse after a few miles driving. no problems at all other modes, full throttle, half throttle, any rpm, valet mode on or off. where to start? plugs, wires, injectors? do i need a code reader? i want the car to run perfectly when i sell it, i'm just not using it since i retired & main job now is driving wifey around in her sedan or suv. also, i'm working on restoring my dream mid-year Thanks!!!

06-09-2016	#2
BYEBYE2U Join Date: Jan 2015 Location: NYC Posts: 30	Re: low rpm miss Had same issue when i picked up my 95: turned out to be ignition wires Run a timing light on all wires n see if you can visualize the miss at idle in a dark garage .....n of course take the easy way out n start with plugs then wires n last coil packs Wires tend to screw up even more when you throw water mist on them Injectors are more than likely NOT the culprit ...you hope...

06-09-2016	#3
Mystic ZR-1 Join Date: Jan 2010 Location: Mystic CT Posts: 2,594	Re: low rpm miss Mine recently had the same symptoms, Fuel pumps solved the problem.

06-09-2016	#4
cloudshe Join Date: Mar 2011 Location: grasonville, md Posts: 33	Re: low rpm miss thanks for those suggestions! wonder if lack of driving caused the problem, i probably haven't put on more than 100 miles in the last 2 years, many months none at all

03-31-2017	#5
cloudshe Join Date: Mar 2011 Location: grasonville, md Posts: 33	Re: low rpm miss changed the plugs, runs perfect all rpm's now!! thanks y'all for the suggestions! hate to sell it but wifey sez 1) i don't like to ride in it, you drive it too crazy 2) you never go anywhere by yourself anymore, so... 3) what about the '65 you're working on? cloudshe