2008 Grand Prix running on 4 cylinders
2008 grand prix.starts and runs but on 4 cylinders. a mechanic tried three different new modules but the car wont even start with the new modules. He puts the original module back in and it starts but still runs on 4 cylinders
modules/coil s ? plugs and wires ? check compression on dead cyls !/?
He pulled all wires off the three caps mounted on the module and only the two on one cap Dont spark. He then said its the module but he put three different new modules on at no cost to me but car won't even start with new mods but starter seems to stay on when he tries to start with new mods. He puts old mod back on and it starts right away and runs descent but only on 4 cyls
There must be some fault codes on the computer. What are they telling you?
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