Thread: Cold misfire after tranny rebuild

Have an '04 N/A with 208k on it and just had the tranny rebuilt by a reputable shop. I got it back from them with a cold misfire, that is it runs a bit rough just upon start-up then goes away. I've replaced the coils (ZZP), plug wires (ZZP), plugs, fuel filter, MAF, MAP, EGR, cleaned the throttle body, crank sensor, ICM, ICM harness, battery cables pos and neg, and downpipe (cat) all within the last 12-14 months.

I'm not sure if in the tranny removal, as they did remove the tranny completely for the rebuild could they have tweaked something. I checked the plug wires and ohm-ed the injectors (13.9-14.6). I haven't checked the fuel pressure yet, but was wondering if it might a fuel pump going out. I'm not sure if there is a good way of ohm-ing the fuel pump or checking it at start-up etc.

Just wanted to know with full removal of the tranny if they could have tweaked something that is a dead giveaway for my problem. Didn't have this problem at all prior to the tranny rebuild and don't want to accuse the shop of anything but suspect it might be a combination of what they did and age/mileage of the car.

Let me know if anyone has any ideas of what it could be, thanks.

I know a tranny rebuild can't cause a misfire, but in getting to the tranny bolts to remove the trans from the motor, are there any fuel or ignition components that are in the way or could be tweaked because of the angle or difficulty in removing the trans from the motor. I assume the rebuild didn't cause the problem, more so the removal and installation of the trans did something to an engine component causing the misfire was my guess, but I'm not sure.

CHECK coolant temp sending unit and wire it's by the trans and exhaust over trans

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