Originally Posted by Mountainman
I am experiencing cylinders 1,3 and 5 missing for a short while after start-up when the vehicle has been sitting for a while, say 2 or 3 hours. It started as just cylinders 1 and 3 but now has included number 5 also. It is only on that bank. I am unable to figure out what is going on. Any ideas? I have a 1998 Grand with the 5.2 V8.
Anything been done to it lately?
There are any number of causes, from old spark plug wires to old spark plugs to head gasket leaking coolant into the cylinder to fouled plugs from valve guides, etc. to
bad injectors, leaking injector, etc. depending on what other symptoms are
The crank position sensor could also be involved as could a bad/corroded engine ground or a dirty throttle body sensor, but you'd expect those to affect cylinders more randomly.
If you pull a couple plugs, what do they look like compared to the ones that don't miss?