But not immediately, it needed like 15. While driving up hills or increasing load, the cel will flash multiple. The hcat and air are n/a if you truck is older than 2000 (hence, the icon)
2003 GMC Sierra 2500HD | GR Auto Gallery
It sounds like the misfire gets worse under load
In that case, you could have an ignition problem (plugs, wires,.
Learn why your check engine light is flashing, what immediate steps to take, common causes, and how to prevent. Anyone else having this issue It will randomly start flashing Only does it for a few seconds to a minute
After this i took the truck for a little drive and started to get a flashing check engine light The truck seemed to drive fine. Hi, i realize this post is nearly 10 years old, but my 2003 gmc sierra 4.3l has the exact problem to the one you. I have a really bad miss at idle, complete with a cel light and rotten egg smell
When i accelerate or rev the engine.
A flashing cel indicates a more severe problem, such as an ignition malfunction or engine performance issue. About 2 weeks later all of a sudden cel came back on, same codes as before, but now what i'm experiencing is a flashing. I am having an issue with my 06 chevrolet silverado 1500 4.3l It runs fine and no issue until i start to go up hill and hit the.
Merging onto the highway, the cel began. I have a 17 gmc sierra 5.3 I had a flashing check engine light for about a month, changed my spark plugs & wires I recently acquired a 2003 sierra denali 1500 with quadrasteer.
The truck as many electrical issues
2004 gmc sierra 2500 hd, 227,000 miles 6.0l v8
