If ignition module goes bad is it possible that only one cylinder stops firing every once in a while? There is one for sale near me and owner says that one cylinder stops firing randomly and then starts up again. He supposedly replaced spark plugs, ignition wires and ignition coil. If he has not replaced ignition module then it could be a cheap fix.
@@CoreMaster111 it’s possible but not likely, if cheap parts were used it’s more likely that it’s got a bad coil or he cracked a plug while installing them. Also using something other than AC delco plugs can cause a random misfire.
@@bulldogsautomotiveadventur4387 Well according to him it doesn't just misfire but one cylinder is completely dead but it does this randomly and when it fires up again it works fine for a little while. He replaced everything mentioned before and still has same problem. Only thing he has not replaced is ignition module. I have not seen or heard the car run so it's obviously difficult to diagnose the problem. Perhaps he has two cylinders down instead of one. In which case it would sound more likely to be ignition module or a bad coil. Because if only one cylinder is not working then ignition module is very unlikely to be a problem. I have some coils from my other car laying around so I can bring one with me and do the same as you did. If no spark then obviously simple fix. If all 6 have spark then it's more likely valvetrain issue unless bad spark plugs or spark plug wires.
I’ve replaced dozens that they’ve "bench tested good" that fixed the problem. They’ll only show up if they’re completely dead like this one was, most are temp dependent and fail while hot.
@@marksokolski3517 the 13 codes are for a completely different system than the 15 codes, 13s are for crank signals and 15s are for traction control. Assuming 3800 engine? They’re good for crank sensor but the signal goes through the ignition module which is also a common problem, I’d start there.
@bulldogsautomotiveadventur4387 it is a supercharged 3.8, so I have to do a timing cover gasket replacement anyway. How to diagnose the module vs the wiring? I am not a wiring genius.
@@marksokolski3517 if the car still runs it’ll be difficult without a scope, it requires pinpoint tests at the module, you’ll have the sensor off anyway when doing the front cover so I’d inspect it for cracks or damage but half the time bad sensors aren’t damaged anyway
Big guy I've got a question ❓ I e got a 2006 Pontiac Grand Prix 3.8 its doing the same thing. I've changed Both the 02 sensors, all the new spark plugs twice, new plug wires, ignition control module twice just to be sure,the coolant temperature sensor,egr valve,mad and Map sensors, And my car still misfires after being warmed up in the morning.
Take a stethoscope or use a screwdriver to listen to the injectors, localize which cylinder by pulling wires then listen to the injector compared to others, if the click sounds muted then the windings in the injector might be failing when hot
