1993 Chevy Truck rpm varies

1993 CHEVROLET TRUCK
136,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
BOXER55
  • MEMBER
  • 2 POSTS
1993 chevy 1/2 ton with 350. when the engine warms up the engine rpm varies around 50 to 75 rpm's when driving between 25 and 40 mph. it idles ok and runs good at higher speeds.
Mar 14, 2009 at 6:36 AM
Advertisement
Avatar
JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Hello, how long since a tune-up? Are there any codes? How is the fuel pressure? If you have a dmm, you can look at sensor signals, see if their acting like they should. A scanner that will show live engine data is quicker. Sometimes the live engine data looks ok and you still have the problem. You have to start somewhere.
Mar 14, 2009 at 7:12 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle