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TrumpyAl · 10-11-2016, 10:49 PM

OK, I need to pull my finger out here.

The poor thing has been sitting here for nearly a year now and this is getting somewhat unhealthy! IMS don't like that. And to make matters worse, I am going to move home some time in the next four weeks.

I would dearly love some information on my next move as I believe that there are plenty of (expensive) traps for the unwary punter. I will create some specific posts for each topic, but wanted to update here first - partly to help me collect my thoughts as life is very hectic and rather stressful at the moment.

So, to summarise...and update with recent information.

Car is a MY02 986 Boxster S which has had a 2000 - 2002 2.7L put in place of the original 3.2L.
The car came with two DME's, one marked 'original', and the other marked as 'New, imported from USA'. They each have the same part numbers, and both behave identically.
It came to me not cranking, and I replaced the Ignition switch.
The car was then cranking but not quite starting so I threw a set of plugs at it and refreshed the fuel.
Still not starting, though it clearly fires on one or two cylinders it seems. It is blowing black smoke after cranking for a while so I know that I'm getting fuel and spark.
I buy a Durametric unit and pull consistent Crank Angle Sensor codes so I replace that.
Codes go away, but no change in behaviour when cranking.
I purchase a workshop manual and the 101 Projects for your Boxster books.
Disconnecting the MAF makes no difference.
I've just very carefully refreshed the fuel again, and checked fuel pressures a couple of weeks ago and they check out 100% ok. I can even see the injectors firing as it cranks - the needle twitches as you'd expect it to at cranking speeds.
Interestingly, disconnecting the fuel pump relay means that the fuel pressure gradually drops to zero - but at no time does the car start and run. Perhaps the plugs are already fouled by this stage so even if it does momentarily have a correct air/fuel mixture, it won't fire. Instead, it eventually settles into an even crank, as you would expect.
Disconnecting the fuel pump relay and using an outside fuel source (e.g. aerostart) gives the same symptoms of occasionally firing, buit nowhere near starting.

So, I have one last check to perform before I'm planning to purchase a 2.7L DME/immobilizer/Ignition set for the car. This is to check that the camshaft timing is correct - a relatively simple task although I'd like to have the replacement plugs on hand first.

I've gotten very used to the idea of being a Boxster owner, it would be very nice to almost be a Boxster driver!

Al.

10-11-2016, 10:49 PM	#44
TrumpyAl Registered User Join Date: Oct 2015 Location: Melbourne, Australia Posts: 243	OK, I need to pull my finger out here. The poor thing has been sitting here for nearly a year now and this is getting somewhat unhealthy! IMS don't like that. And to make matters worse, I am going to move home some time in the next four weeks. I would dearly love some information on my next move as I believe that there are plenty of (expensive) traps for the unwary punter. I will create some specific posts for each topic, but wanted to update here first - partly to help me collect my thoughts as life is very hectic and rather stressful at the moment. So, to summarise...and update with recent information. Car is a MY02 986 Boxster S which has had a 2000 - 2002 2.7L put in place of the original 3.2L. The car came with two DME's, one marked 'original', and the other marked as 'New, imported from USA'. They each have the same part numbers, and both behave identically. It came to me not cranking, and I replaced the Ignition switch. The car was then cranking but not quite starting so I threw a set of plugs at it and refreshed the fuel. Still not starting, though it clearly fires on one or two cylinders it seems. It is blowing black smoke after cranking for a while so I know that I'm getting fuel and spark. I buy a Durametric unit and pull consistent Crank Angle Sensor codes so I replace that. Codes go away, but no change in behaviour when cranking. I purchase a workshop manual and the 101 Projects for your Boxster books. Disconnecting the MAF makes no difference. I've just very carefully refreshed the fuel again, and checked fuel pressures a couple of weeks ago and they check out 100% ok. I can even see the injectors firing as it cranks - the needle twitches as you'd expect it to at cranking speeds. Interestingly, disconnecting the fuel pump relay means that the fuel pressure gradually drops to zero - but at no time does the car start and run. Perhaps the plugs are already fouled by this stage so even if it does momentarily have a correct air/fuel mixture, it won't fire. Instead, it eventually settles into an even crank, as you would expect. Disconnecting the fuel pump relay and using an outside fuel source (e.g. aerostart) gives the same symptoms of occasionally firing, buit nowhere near starting. So, I have one last check to perform before I'm planning to purchase a 2.7L DME/immobilizer/Ignition set for the car. This is to check that the camshaft timing is correct - a relatively simple task although I'd like to have the replacement plugs on hand first. I've gotten very used to the idea of being a Boxster owner, it would be very nice to almost be a Boxster driver! Al. __________________ 2001 Boxster S, TipTronic in Seal Grey aka "The Imp" 2001 TE50, ESS in (now) Grigio Titanio Matallizzato aka "The Golden child"