SPONSORED LINKS

1996 Chevy Truck Engine Misfire

Tiny
RYNE33
  • MEMBER
  • 1996 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 102,000 MILES
The engine in my truck suddenly started to run very rough and misfire (while it was being driven). The check engine light came on immediately. By the time I got home at least one of the cat converters was very hot. I scanned the code and it came back P0300 random misfire, no other codes where set. It starts fine but at times I can smell raw fuel in the exhaust (due to the misfire problem?) The EGR valve looks fine and was not stuck open, It appears I am get a consistent spark to all cylinders. I have replaced the lower intake manifold a couple of years ago with all the standard tune up stuff (wires plugs etc) what would you reccomend I do (or where do I start? Thanks. Mark
SPONSORED LINKS
Tuesday, March 11th, 2008 AT 10:11 PM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Sounds more like an injector problem than spark, those CPI engine were great for that. Need to find out which cyl has the problem. A scanner that can read "misfire data" will tell you or you can try squirting water on each exhaust port on the manifold to see which one is cold. You will most likely need a new injector. Try pulling the plugs to see if one is darker than the others
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, March 12th, 2008 AT 8:05 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
Yes I agree. Those injectors are so problematic that they have changed the design of it. When you buy a new cpi it will look different and be problem free. It seems like at 100k miles they go bad. It also comes with the fuel pressure regulator which is also very problematic. Let us know if you need further assistance.
Was this
answer
helpful?
Yes
No
Wednesday, March 12th, 2008 AT 11:31 AM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE

Sponsored links