[meinporsche]

I have a 1993 968 coupe. It has 93000 miles and I just replaced the water pump. The car did get hot so my mechanic that came over helped me replace the ignition coil because the factory one was bad. We have checked everything else and still no start. It cranks beautifully and sounds like it wants to start. We are thinking it could be in a relay that runs the computer ingition or the fuel pump. Anyone else had this problem after replacing a water pump?

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[flash]

try the DME relay for sure - buy 2 - you'll need a spare

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[Greimann]

[quote name='meinporsche' date='Nov 19 2005, 10:42 AM']....  Anyone else had this problem after replacing a water pump?

[right][post="12572"]<{POST_SNAPBACK}>[/post][/right][/quote]

It is not going to be the act of replacing the pump itself, but something that was disturbed in the process.



When you have a general problem like a no start, you need to go through the steps to make sure the basics are covered, basically two things are needed - fire and fuel.



Do you have spark? Pull a plug wire and put a spare spark plug in the boot. Ground the threads of the plug on a good ground and see if you have a spark across the gap when cranking. Of course don't grab any bare metal parts with your hand while standing in a puddle of water while doing this!



Do you have fuel? Since you have tried to start the car, pull a plug and see if it is wet with fuel. Can you hear the fuel pump run? Does the tail pipe smell of raw fuel? Like Flash said, at least jiggle the DME relay. That is the fuel pump relay.



Figure out which of the two elements (fire, fuel) you don't have first, then branch off from there.

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[S_Cal968]

If you had to get into the distributor when servicing the w/pump, I'd check that everthing is back together correctly and nothing was damaged upon re-assembly.



Also, if your mech has a fuel press gauge, have him check the pressure. The factory manual calls out the pressure as ~53 - 56psi before start, [& ~48.5psi w/ engine running].

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[meinporsche]

sweet guys. i think we will have it running this weekend. the guy that works on my car actualy works at the porsche dealership where i live so if he cant figure it out then i dont know what i will do <img src="/forum/images/smilies/968/tongue.gif" class="smilie" alt="" />

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[Harvey]

Lots of things can keep these great cars from starting...you just have to eliminate them by the scientific method, one by one. Spark, gas, fuses, ad infinitum. Been there, done about everything before getting it running. I'ts not missed a lick since though. Turned out to be a bad electrical connection. Your's seems to be related to your recent work. Retrace you steps carefully and double-check, as has been suggested. Also, a search of archives in this and other forums will cover about every conceivable no-start possibility.



Then again, a Porsche mechanic has experience troubleshooting and SHOULD be able to quickly get it going again, unless they're relatively inexperienced with the 944/968 and use your car to learn on.



Good luck,



Harvey

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