1991 Chevy S-10 miss or hesitation at high speed

Tiny
ZELLER38
  • MEMBER
  • 1991 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
When I get to 60 mph or so if the engine is under load it starts to hesitate. Will run ok if I let off the gas a bit. I first noticed it about a month ago pulling my boat. Then it went away. Now it is happening all of the time if I accelerate after I hit highway speed. I can punch it and downshift and it will still pick up speed but will hesitate the whole time. Feels like my outboard when I drop a cylinder. I changed the fuel filter and it didnt help. It seems to do it less if I run premium. Any ideas.
Sunday, September 12th, 2010 AT 9:41 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi zeller38, Welcome to 2carpros and TY for the donation-this is what keeps the site going.

Lack of acceleration, chugging, hesitating, jerking, bogging, misfiring etc. Could be caused by one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.
Was this
answer
helpful?
Yes
No
Sunday, September 12th, 2010 AT 10:28 PM
Tiny
ZELLER38
  • MEMBER
  • 3 POSTS
I thought it would be one of the things you listed. I had hoped by seeking someone with experience with s10 in the past they would be able to give me a more likely option. I thought there may have been something that is more often the culprit. I will have to take it in. I have a form of als and have limited use of my right side and hands now. I am not able to check many of the areas you listed.
Was this
answer
helpful?
Yes
No
Sunday, September 12th, 2010 AT 11:41 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Every item I've mentioned can cause hesistation, you can try the throttle position sensor and manifold absolute pressure sensor for a start this problem can drag on and its right underneath our nose
Was this
answer
helpful?
Yes
No
Sunday, September 12th, 2010 AT 11:47 PM
Tiny
ZELLER38
  • MEMBER
  • 3 POSTS
I can try that tomorrow after work. Thanks for a starting point.
Was this
answer
helpful?
Yes
No
Sunday, September 12th, 2010 AT 11:54 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