2008 Grand Prix running on 4 cylinders

Asked by Jul 24, 2015 at 02:40 PM about the 2008 Pontiac Grand Prix GXP

Question type: Maintenance & Repair

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

3 Answers


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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