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Forum: Porsche 924/944/968 Technical Forum

01-16-2009, 12:09 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Well said 83Zel944. Its easy to fix things...

Well said 83Zel944.

Its easy to fix things when armed with a garage full of spares and a known good runner in your garage that you can use to experiment on. Its very rare to find someone prepared...

Forum: Porsche 924/944/968 Technical Forum

01-15-2009, 12:47 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Ok, just out of interest where is Winter Park?

Ok, just out of interest where is Winter Park?

Forum: Porsche 924/944/968 Technical Forum

01-14-2009, 01:03 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Ok, Lets see what the outcome of that is....

Ok,

Lets see what the outcome of that is. If that all checks out then theres not much left but the DME controller. Maybe u could send it to SolReaver to confirm its if its dead, at least you guys...

Forum: Porsche 924/944/968 Technical Forum

01-13-2009, 05:23 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

The resistance from the DME relay to the...

The resistance from the DME relay to the injectors was 0.3 ohm with the DMM internal of 0.2 ohm so the would be 0.1 ohm through the circuit so I think that connector is good as we measured through it...

Forum: Porsche 924/944/968 Technical Forum

01-13-2009, 02:50 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

We are starting to eliminate almost everything...

We are starting to eliminate almost everything here, so to re-cap again - its beginning to be like Apollo 13 - just tell me whats good on the spacecraft:

We have the fuel pump running and...

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 02:10 PM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Guys I'm begining to query the results of the...

Guys I'm begining to query the results of the tests done right back at the start -

" i did make a jumper and the fuel pump is operating. In fact i used the jumper to test flow at the rail. With...

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 12:55 PM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

http://forums.pelicanparts.com/uploads14/DMEtest12...

http://forums.pelicanparts.com/uploads14/DMEtest1231793745.jpg

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 11:27 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Yip thats right. From the DME relay to the...

Yip thats right. From the DME relay to the injector connector.

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 09:02 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

I take it the 10.43V is on the DME controller...

I take it the 10.43V is on the DME controller side and the 12.27 on the feed from the DME relay?

There are no shorts in the wiring and the injectors are all good.

What is the resistance from...

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 08:09 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

If you download vol1 - engine manual from cannels...

If you download vol1 - engine manual from cannels website section 28 has a step by step guide with pics on troubleshooting the DME.

Theres a complete set of workshop manuals for 928, 944, 968,...

Forum: Porsche 924/944/968 Technical Forum

01-12-2009, 02:01 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

You will have 12V on both contacts of the...

You will have 12V on both contacts of the injectors until the DME fires it. This is a short pulse to ground so you wont see it on a multimeter, in the pic it lasts for 2ms, you can only see it with a...

Forum: Porsche 924/944/968 Technical Forum

01-11-2009, 01:27 PM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Ok, do the continuity check just to make sure we...

Ok, do the continuity check just to make sure we dont have a high resistance it might just show up where the problem is. You have been very thorough with the tests and we are close to the cause I'm...

Forum: Porsche 924/944/968 Technical Forum

01-11-2009, 10:51 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Ok thats good, it means that the DME relay is...

Ok thats good, it means that the DME relay is working correctly the first click is closing the contact in the DME relay that provides power to the DME controller. Looking at the diagram power is...

Forum: Porsche 924/944/968 Technical Forum

01-11-2009, 07:18 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

The DME relay is the one in the middle where the...

The DME relay is the one in the middle where the big red and blue wire goes into, from the photo it doesent appear to be fully in the connector. I can see the contacts of the relay and the connector...

Forum: Porsche 924/944/968 Technical Forum

01-10-2009, 01:46 PM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

I would really like to help with pics but I have...

I would really like to help with pics but I have a 96. However all your tests have shown that the issue is a lack of fuel, for some reason the injectors are not firing but they worked before you...

Forum: Porsche 924/944/968 Technical Forum

01-10-2009, 01:07 PM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Nope its an electrical fault, when they spray...

Nope its an electrical fault, when they spray they shoot like a garden hose. You have 36 psi behind the fuel in the rail, thats the same as the pressure in your front tyres a little bit of dirt isnt...

Forum: Porsche 924/944/968 Technical Forum

01-10-2009, 11:51 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Heres the diagram of the83 USA 944 downloaded...

Heres the diagram of the83 USA 944 downloaded from http://www.cannell.co.uk/Manuals.htm

http://forums.pelicanparts.com/uploads14/dme1231616799.jpg

From the diagram cylinders 1 and 2 fire...

Forum: Porsche 924/944/968 Technical Forum

01-09-2009, 10:31 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

The injectors are low impeadance/resistance so in...

The injectors are low impeadance/resistance so in the range 1-5 ohms ( 12 - 2 amps ), the feed has to supply two injectors every spark and so needs to source at least 4 amps.

The connection on...

Forum: Porsche 924/944/968 Technical Forum

01-09-2009, 08:20 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Yip, I'm kinda out of ideas here and clutching at...

Yip, I'm kinda out of ideas here and clutching at straws.

The DME fires the injectors in pairs (1 and 2, then 3 and 4) so its something common to them all if theres no fuel. The power comes from...

Forum: Porsche 924/944/968 Technical Forum

01-09-2009, 06:28 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

You'll get the manuals at...

You'll get the manuals at http://cannell.co.uk/Manuals.htm

Forum: Porsche 924/944/968 Technical Forum

01-09-2009, 01:37 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Ok, so to re-cap - Theres compression, fuel...

Ok, so to re-cap -

Theres compression, fuel in the rail at a good pressure, sparks at the plugs, the injectors are firing, it wont start on petrol but will on starting fluid. With the fact that it...

Forum: Porsche 924/944/968 Technical Forum

01-08-2009, 02:00 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Agreed, the car runs when it gets when it gets...

Agreed, the car runs when it gets when it gets something to burn and so it has to be lack of fuel from the injectors. It will be something simple like a bad/broken connection when pulling the fuse or...

Forum: Porsche 924/944/968 Technical Forum

01-07-2009, 09:13 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

The noid light showed that the injectors were...

The noid light showed that the injectors were firing I believe and it ran on starter fluid. The rail had fuel in it so the only thing left is that its not geting through the injectors, unless it just...

Forum: Porsche 924/944/968 Technical Forum

01-07-2009, 07:37 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

It worked before you did the compression test so...

It worked before you did the compression test so it has to be related to what happened at the time. If you can't check the pressure then assuming its a bad connection to the pump through the car...

Forum: Porsche 924/944/968 Technical Forum

01-07-2009, 06:14 AM

Replies: 135

Classic no-start with a twist

Views: 8,158

Posted By MikeStewart

Yip, its needing rings, that was just for...

Yip, its needing rings, that was just for interest as I'm checking mine at the weekend if I can get the tester, it wouldnt stop it running.

Looking through the replies it seems that you have...

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