forgive me if this has been covered before, my search skills aren't great.
my originally eta, now 2.5l started having cold start issues recently. would crank, and crank, but wouldn't start until the 5th or 6th try. then it runs rough and has a bad hesitation for the first 30-45 seconds of driving. opening the throttle quickly makes it bog, sputter, and sometimes stall. once it gets going though, it's ready to rock. runs great. when the engine is warm it starts first try, easily.
i started doing the whole run down, looking for obvious problems. one of the first tests i did was to see if the blue plug was working properly. i tested it's resistance at the plug, and got 38 ohms with my multimeter on the 200 range. went down the wiring harness to the c191 conn. and tested it there. same result. when i tested it at the dme plug, it was 2 ohms. this indicates to me there may be a short in the harness. wiring looks good, no frayed wires, nothing obviously melted or bad. i checked individual continuity for each sensor lead and they looked good.
next, i tested with a spare wiring harness i have. i just attached it at the c191 plug. this time, the resistance at the dme plug was in the 100s. wtf? i haven't swapped the main harness completely yet to see if that fixes it (lotsa work) but shouldn't i be getting the same 38 ohm reading at the dme plug as at the sensor?
i tested a couple of spare 'blue plugs' that i also had laying around and they read 38 ohms as well.
i'm going to borrow a fuel pressure tester and maybe a vacuum gauge to see if it isn't another issue. it definitely feels like it isn't getting fuel when it starts. i swapped my fuel pressure regulator for a spare (yes, 3 bar), no change.
also checked the plugs to see if they could tell me anything. all were whitish on one side of the insulator, and dark on the other. like one side of the chamber is lean, and the other is rich. none were wet. no gas smell in oil. don't think it's leaky injectors.
running motronic 1.3
any suggestions?
my originally eta, now 2.5l started having cold start issues recently. would crank, and crank, but wouldn't start until the 5th or 6th try. then it runs rough and has a bad hesitation for the first 30-45 seconds of driving. opening the throttle quickly makes it bog, sputter, and sometimes stall. once it gets going though, it's ready to rock. runs great. when the engine is warm it starts first try, easily.
i started doing the whole run down, looking for obvious problems. one of the first tests i did was to see if the blue plug was working properly. i tested it's resistance at the plug, and got 38 ohms with my multimeter on the 200 range. went down the wiring harness to the c191 conn. and tested it there. same result. when i tested it at the dme plug, it was 2 ohms. this indicates to me there may be a short in the harness. wiring looks good, no frayed wires, nothing obviously melted or bad. i checked individual continuity for each sensor lead and they looked good.
next, i tested with a spare wiring harness i have. i just attached it at the c191 plug. this time, the resistance at the dme plug was in the 100s. wtf? i haven't swapped the main harness completely yet to see if that fixes it (lotsa work) but shouldn't i be getting the same 38 ohm reading at the dme plug as at the sensor?
i tested a couple of spare 'blue plugs' that i also had laying around and they read 38 ohms as well.
i'm going to borrow a fuel pressure tester and maybe a vacuum gauge to see if it isn't another issue. it definitely feels like it isn't getting fuel when it starts. i swapped my fuel pressure regulator for a spare (yes, 3 bar), no change.
also checked the plugs to see if they could tell me anything. all were whitish on one side of the insulator, and dark on the other. like one side of the chamber is lean, and the other is rich. none were wet. no gas smell in oil. don't think it's leaky injectors.
running motronic 1.3
any suggestions?