SPONSORED LINKS

1991 Chevy Corvette 91 ZR1 Hesitation, Stumbles, Misses whe

Tiny
MIKEPRENTICE1
  • MEMBER
  • 1991 CHEVROLET CORVETTE
  • V8
  • 2WD
  • MANUAL
  • 58,500 MILES
Just got this car this spring - I changed all filters and fluids and new spark plugs. Every thing ran great for first 500 miles, but the last 2 or 3 times I took it out for a nice Sunday drive and a problem occurred.
Car starts and runs fine when engine is cold.
After engine gets to operating temperature, I have the follwing problems:
a) Hesitates and stumbles during acceleration
b) Idle increases to almost 2,000 rpm
c) During steady cruise speed 40 -50 mph, engine misses - not enough to change vehicle speed but you can still feel it.
SPONSORED LINKS
Monday, September 14th, 2009 AT 2:30 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hesitating, stumbling, jerking and lacks acceleration could be caused by the following:

Oxygen sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Tuesday, September 15th, 2009 AT 5:24 PM

Please login or register to post a reply.

Related Engine Hesitate Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Hesitation
GUIDE
Hesitation
An engine hesitation is an interruption of continuous power during acceleration. When a engine is hesitating it will cause the car to lunge or surge which will cause a...
VIEW MORE

Sponsored links