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Starts and dies early 944

S

Sean944nov

New member
hi guys I’m about to admit defeat an send the car to a specialist , im not a
mechanic but I don’t like to give in so I’m giving it one more try, I drained the tank replaced fuel pump and filter replaced fuel pressure regulator replaced the injectors replaced both sensors also new dme relay and then new dme new battery also . Oh and new plugs, it’s getting spark and fuel no leaks on any hoses , the results of all this have made no difference what so ever it starts first turn of the key then dies , sometimes it might run on a little like it’s trying to keep going but never does. HELP
 
Sean944nov said:
hi guys I’m about to admit defeat an send the car to a specialist , im not a
mechanic but I don’t like to give in so I’m giving it one more try, I drained the tank replaced fuel pump and filter replaced fuel pressure regulator replaced the injectors replaced both sensors also new dme relay and then new dme new battery also . Oh and new plugs, it’s getting spark and fuel no leaks on any hoses , the results of all this have made no difference what so ever it starts first turn of the key then dies , sometimes it might run on a little like it’s trying to keep going but never does. HELP
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Sounds like you've done pretty much everything. If it starts but won't run the immediate suspect is fuel pressure - i.e. enough to start the car but not enough to run it. This could be an electrical problem where systems are energized for starting but not for running. Even though you have replaced most of the fuel system I would check fuel pressure to ensure the fuel pump is still running after the start phase as it sounds like you are running out of fuel based on your description. I would be checking for electrical signals from the sensors, fuse/relay box and the DME plug itself as well as grounds...if the system doesn't detect a running engine when you release the key - it will shut off the fuel pump.
 
Sounds like you need to check the DME and relay are getting power from the ignition switch when it's in the Run position.
 
Thanks to both of you for replying to me, I’m going to change the ignition switch and check all the wires and earths and will let use know what happens, thanks again
 
I would go for the ignition switch too, not the part with key but the switch behind, they are known to do odd things especially when there has been a big bunch of keys in use
 
Hi Bruce
i‘m preparing for the ignition switch to arrive and need to know do I need to remove the dash to get to it ? Or is there a simple way round it , probably not knowing my luck lol
regards sean
 
No, there are two items that look similar either end of the fuel rail. I think its the one at the front but PET will help or google the damper.
 
Opposite end of the fuel rail to the regulator, when the diaphragm fails does it allow fuel into the vacuum line? if it does should be an easy check - though if it wont hold suction also a good sign the diaphragm has gone.
Tony
 
Ok thanks I’ve a new ignition switch coming today if it doesn’t start with that then I will try your idea, have you known this to happen on your car?
regards Sean
 
PET shows part 17 as the damper 944 110 201 01(year dependent) and part 18 as the regulator 944 110 198 01
 
Hi guys no luck , I installed the new ignition switch and no change.
Im ready to give up, I pulled the fuel rail and put down some paper and they
seemed to fire the fuel exactly as they should when turning it over , so I just tried once more and walked away ??????????????
 
What about the fuel damper?

have you tried wiggling the two ref/flwheel sensors and checking the two connections and also earths going to the body. Try taking them off and giving the ends a clean with fine sand paper or wire brush if they look green or crusty.

Also have you checked your plugs , leads , dizy cap inside , also check your rotor is not loose and in good nick

iffy DME

sorry if I’m repeating anything I’ve not had another read from the start of the thread for a few days now and about to go to bed.

Ive had and seen this sympton before and it was the ref sensors where on there way out, I would buy those as the last resort . Give the connections a wiggle and maybe a light tap on top maybe where they go into the bellhousing and see if it does anything? ( light tap )

Have you checked timing is spot on and not a few teeth out?

did you tap the sensors or check they are right? Wonder if they have come loose slighty And moved the correct gap from the fYwheel teeth, may be too far away? . Something ? Could simply be that? cant remember now what it should be (I only did mine last summer , but it’s gone out of my brain.

check all the vacume lines for leaks. Best thing is to pressurise the system if you have a hand pump preasure tester or similar from the intercooler pipe.


Daniel
 
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