2003 Chevrolet Suburban Repair Question
Mileage: 20,800 miles.
Any ideas on what would make it not hardly run and no engine light on?
Answer
so it's still having the problem? what did plugs look like?
Retest the fuel pressure. What sort of pressure, if any, is the pump delivering? If nothing, see if the pump is receiving power. If not check the relay and the fuse.
Then have it scanned for soft codes. The blinking CEL means a soft code that isn't serious enough to cause the CEL to light solid, but bad enough to cause catalytic damage. You have to specify that you want soft codes pulled, because the less expensive scanners won't do it.
We put new plugs in. Light is no longer blinking but it still runs very rough. Have to get the RPM's up to get it to even partially run.
Again, have it scanned for soft codes. The blinking CEL says at least one was set. And most cheap scanners won't pull soft codes.
Also, check for loose connections and vacuum leaks.