Misfiring 944 S2 Cab
11-10-2006, 12:34 PM
#1
3rd Gear
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Misfiring 944 S2 Cab
Hi guys, although i haven't posted on these forums i have been checking them out for year's while i have owned my 944 but i really need some help now as the car has almost beaten me 
My little porker has been running sweet for the past 6 year's until i started it up a few weeks ago. It starts up but runs REALLY rough, feels like it's only running on 2/3 cylinders on tickover, the whole car shakes while it's misfiring.
My first port of call (i'm not that good with car's) was to check for the spark, replaced coils, disy cap, spark plugs but no joy. It seems to spark fine, changed fuel rail and injectiors incase it might have been injector's didn't fix it. Also got a friend to have a look and he did a compression test and said #4 was low on compression so i thought that could be it. Just had head replaced etc by garage compression is back on #4 as it should be but it's exactly the same
It seems to run okish over about 4krpm, i haven't tested it much as i'm afraid i will break something running it like it is.
Anyone got any ideas? I can't afford to buy a ECU for it atm without knowing it might be that as i'm chasing my tail tbh.
Please help me guys
My little porker has been running sweet for the past 6 year's until i started it up a few weeks ago. It starts up but runs REALLY rough, feels like it's only running on 2/3 cylinders on tickover, the whole car shakes while it's misfiring.
My first port of call (i'm not that good with car's) was to check for the spark, replaced coils, disy cap, spark plugs but no joy. It seems to spark fine, changed fuel rail and injectiors incase it might have been injector's didn't fix it. Also got a friend to have a look and he did a compression test and said #4 was low on compression so i thought that could be it. Just had head replaced etc by garage compression is back on #4 as it should be but it's exactly the same
It seems to run okish over about 4krpm, i haven't tested it much as i'm afraid i will break something running it like it is.
Anyone got any ideas? I can't afford to buy a ECU for it atm without knowing it might be that as i'm chasing my tail tbh.
Please help me guys
11-10-2006, 01:01 PM
#3
3rd Gear
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yeah i replaced them aswell
I really do appriciate the help guys, and please feel free to point out any ideas that may seem obvious to you as i'm sure there are alot of things i haven't tried as i'm not to good with mechanic's. I always though fuel+spark+air= liftoff but it's not as simple as that i guess.
I really do appriciate the help guys, and please feel free to point out any ideas that may seem obvious to you as i'm sure there are alot of things i haven't tried as i'm not to good with mechanic's. I always though fuel+spark+air= liftoff but it's not as simple as that i guess.
11-10-2006, 01:08 PM
#4
Burning Brakes
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Ok. Do these things first.
while it is running take a long screwdriver or small diameter pipe, use it like a stethoscope and listen to each injector. They should be clicking.
Make sure you do not have any of the plug wires crossed. Pull each one off far enough so as to make the cylinder misfire. Be careful not to get shocked. the ones that do not change the running of the engine are the ones misfiring. if there is only one then you probably do not have any wires crossed. If two are misfiring try crossing those at the dist cap and see if it runs any better.
while it is running take a long screwdriver or small diameter pipe, use it like a stethoscope and listen to each injector. They should be clicking.
Make sure you do not have any of the plug wires crossed. Pull each one off far enough so as to make the cylinder misfire. Be careful not to get shocked. the ones that do not change the running of the engine are the ones misfiring. if there is only one then you probably do not have any wires crossed. If two are misfiring try crossing those at the dist cap and see if it runs any better.
