mikes porsche 944s

[howlinwolf71]

hi all new here never done this well here it goes im mike from cardiff wales got a 944s ventiler the car turns over but dont start have any one got any ideas not a mechanic myself cheers all

[LuS1fer]

A million possibilities.
Is there fuel at the injectors (if injected).
If so, is there a spark at the plugs?
Where in Cardiff?

[slevin911]

hey mike welcome!! you should post in the porsche forum section they should be able to help you out!!

[tr7v8]

howlinwolf71 said:

hi all new here never done this well here it goes im mike from cardiff wales got a 944s ventiler the car turns over but dont start have any one got any ideas not a mechanic myself cheers all

Go over to www.tipec.net & do a search & you'll find an exhaustive list. But when you spin the key does the revcounter bounce off the stop & have you changed the DME relay?

[howlinwolf71]

hi thanks will look at porsche forum

[crofty1984]

Does it have a spark?
Take plug out.
Put on end of HT lead.
Press edge of plug against something grounded (bare metal on engine block?)
Have a mate turn the car over. (With big strong arms!)
OK, turn the engine over instead.
If you see a strong blue spark, then it's not electrical.

Next thing to check is whether it's getting fuel.
Change the fuel filter.
Try again.
Try taking a plug out once you've tried starting it a bit. Are the plugs wet? If so, fuel is getting there.
Does the plug look very black and sooty? if so, the mixture is too rich (too much fuel, not enough air)
Change air filter and clean up the spark plugs with a bit of emery cloth.

Is the fuel OK (I've got a boat with 200 litres of Christ-knows-what in the tank)

There's a few basics to get you on your way. Not specific to 944s but useful to know.

Welcome to PH, and watch out for the grammar Nazis.

[Kinky]

howlinwolf71 said:

hi thanks will look at porsche forum

No need. I've moved it here for you

[tr7v8]

crofty1984 said:

Does it have a spark?
Take plug out.
Put on end of HT lead.
Press edge of plug against something grounded (bare metal on engine block?)
Have a mate turn the car over. (With big strong arms!)
OK, turn the engine over instead.
If you see a strong blue spark, then it's not electrical.

Next thing to check is whether it's getting fuel.
Change the fuel filter.
Try again.
Try taking a plug out once you've tried starting it a bit. Are the plugs wet? If so, fuel is getting there.
Does the plug look very black and sooty? if so, the mixture is too rich (too much fuel, not enough air)
Change air filter and clean up the spark plugs with a bit of emery cloth.

Is the fuel OK (I've got a boat with 200 litres of Christ-knows-what in the tank)

There's a few basics to get you on your way. Not specific to 944s but useful to know.

Welcome to PH, and watch out for the grammar Nazis.

Nope standard 944 testing is as above, if the rev counter doesn't bounce there will be neither spark or fuel, if the DME relay is dead then there will be one but not the other!

[AndrewW-G]

One of the most common causes of this in Porsches of a certain age (late 80's - mid 90's) is a failure of the DME relay, which results in the fuel pumps / Injection system not squirting fuel into the motor . . . . .google DME failure and you'll find plenty of guides on how to check if this is causing your problem

[howlinwolf71]

where is cardiff its the capital f wales

[howlinwolf71]

thanks crofty will try them out many thanks

[LuS1fer]

howlinwolf71 said:

where is cardiff its the capital f wales

IN not IS

Reading not a strong point either...

[howlinwolf71]

thanks andrew where is the dme relay located ive got spare relays what does it look like stupid question i ask sorry

[AndrewW-G]

howlinwolf71 said:

thanks andrew where is the dme relay located ive got spare relays what does it look like stupid question i ask sorry

Mike, have a look at this

http://www.dietersmotorsports.com/tech/2001/DME_re...

If the car is pre 1985, it's relay number two in this picture of the fusebox

[tr7v8]

howlinwolf71 said:

thanks andrew where is the dme relay located ive got spare relays what does it look like stupid question i ask sorry

It will be in the relay/fuse crate under the bonnet. It will be marked DME on the key on the lid. Reseat all the relays whilst there & pull the relevant fuses & check they are OK & not corroded.

Edited to say A. stick to one thread & B. it is a specific relay for around £20 or so. You should keep a spare, they do die.....

Edited by tr7v8 on Thursday 3rd November 20:42

[howlinwolf71]

thanks my car is 1988 f reg ventiler which one is it cheers

[AndrewW-G]

Fusebox in the engine bay, relay is the one with the coloured dot in the picture

[howlinwolf71]

found a spare one cheers will try this dme relay an let you know cheers

[howlinwolf71]

the one i have is not marked with a dot but does say dme on it so i think i found it cheers andrew

[cd1957]

Hi u can bridge out the dme and try,the pump must run,could be the cranksensor failure.I am based in Cardiff(Whitchurch) if you get stuck.

Chris