Porsche 944 1983 - 4 star or unleaded????
Discussion
so... putting in 4 star won't damage it? It's been off the road since buying it last Summer, decided to put fuel in (Tesco 4 star) , but it won't start. Obviously there are loads of other reasons it won't start, but really needed to find out what fuel it should have in it.
And the only other option is optimax?
And the only other option is optimax?
keren29 said:
so... putting in 4 star won't damage it? It's been off the road since buying it last Summer, decided to put fuel in (Tesco 4 star) , but it won't start. Obviously there are loads of other reasons it won't start, but really needed to find out what fuel it should have in it.
And the only other option is optimax?
4 star from Tesco- how? unless youve gone back in times a few years I doubt it & think you've got confused with LRP, which you don't need & its generally considered to be cack.
You need Opti, or super UL.
944 not starting= DME relay is most likely ya problem, always best to carry a spare.
many thanks -
the car has been stood up for a few months , whilst i replaced the clutch master cylinder and bought a new battery. When I tried to start it with a new battery it was turning over, but not firing. I removed the plug from the fuel rail and established no fuel was getting the injectors - hence a trip to Tesco with a petrol can. With fuel added there was still no fuel getting to the injectors and I was pretty certain that the fuel pump wasn't working. Next step was to try and check the fuel pump fuse, but the American Haynes manual additional fuse board layout bears no resemblance to mine.
After removing a few fuses and re-fitting them, the fuel pump started to work and the car started but despite revving to keep it going, it stalled after about 30 seconds and we haven't managed to get it started again. I can hear the fuel pump working but it just won't fire.
Does this still sound like the DME, and, if so, how do I identify it from the other relays ? Is there a way of checking it?
Thanks again.
the car has been stood up for a few months , whilst i replaced the clutch master cylinder and bought a new battery. When I tried to start it with a new battery it was turning over, but not firing. I removed the plug from the fuel rail and established no fuel was getting the injectors - hence a trip to Tesco with a petrol can. With fuel added there was still no fuel getting to the injectors and I was pretty certain that the fuel pump wasn't working. Next step was to try and check the fuel pump fuse, but the American Haynes manual additional fuse board layout bears no resemblance to mine.
After removing a few fuses and re-fitting them, the fuel pump started to work and the car started but despite revving to keep it going, it stalled after about 30 seconds and we haven't managed to get it started again. I can hear the fuel pump working but it just won't fire.
Does this still sound like the DME, and, if so, how do I identify it from the other relays ? Is there a way of checking it?
Thanks again.
I think the DME relay provides a feed to the fuel pump so if you're sure the pump is running then it may be something else. I'd be looking at making sure I had a spark and double checking that fuel was being supplied and going from there.
My 944 requires 98 ron and has run fine of 97/98 ron unleaded for a year and a half now.
Good luck,
Mark
My 944 requires 98 ron and has run fine of 97/98 ron unleaded for a year and a half now.
Good luck,
Mark
944s are wonderfuly forgiving, and will run on turps if they have to. if your car isnt starting it has B***er all to do with which fuel youve put in it (ok, diesel possibly a no no).
since it is a 1983 model it has no catalytic converter so it matters not one jot if you use 4 star leaded, LRP or unleaded. unlike many other cars of the era the valve seats are sufficiently robust that LRP isnt a must. the factor affecting performance/running will be the RON value - ie combustibility of the fuel. as far as I know optimax is the only widely available 98RON, though BP ultimate is close at 97RON. It will run a bit better with optimax but will burble along quite happily on bog standard 95RON unleaded (at least mine did for 5 years).
addendum: i think old leaded 4 star was about 98ron hence the label on your filler cap. old two star was about 95ron. when the change came to unleaded the hoohah/fanfare was all about the environmental benefit of removing the tetraethyllead. quite justified since its very very toxic. a cynic might note however that in all the hype the RON value downgrading sort of slipped in unnoticed whilst the price went up. so we got more tonic and less gin for a higher price. nothing new there then
>> Edited by softinthehead on Monday 28th March 19:10
since it is a 1983 model it has no catalytic converter so it matters not one jot if you use 4 star leaded, LRP or unleaded. unlike many other cars of the era the valve seats are sufficiently robust that LRP isnt a must. the factor affecting performance/running will be the RON value - ie combustibility of the fuel. as far as I know optimax is the only widely available 98RON, though BP ultimate is close at 97RON. It will run a bit better with optimax but will burble along quite happily on bog standard 95RON unleaded (at least mine did for 5 years).
addendum: i think old leaded 4 star was about 98ron hence the label on your filler cap. old two star was about 95ron. when the change came to unleaded the hoohah/fanfare was all about the environmental benefit of removing the tetraethyllead. quite justified since its very very toxic. a cynic might note however that in all the hype the RON value downgrading sort of slipped in unnoticed whilst the price went up. so we got more tonic and less gin for a higher price. nothing new there then
>> Edited by softinthehead on Monday 28th March 19:10
many thanks for your help.
I have managed to start the car three or four times now, but it is very difficult to start, has flattened the battery and when it does fire, it sounds like it is only running on 3 cylinders with plumes of blue smoke billowing from the exhaust. I am hoping it is just a faulty plug and nothing more serious.
If any other 944 owners have had similar experiences with a car stood up for months, I'd be grateful for the advice.
I have managed to start the car three or four times now, but it is very difficult to start, has flattened the battery and when it does fire, it sounds like it is only running on 3 cylinders with plumes of blue smoke billowing from the exhaust. I am hoping it is just a faulty plug and nothing more serious.
If any other 944 owners have had similar experiences with a car stood up for months, I'd be grateful for the advice.
Blue smoke as in running rich. Put new plugs in and it started straight away, but then would not start again. After an hour or so, it started and kept running for 15 minutes until it was turned off. Too late in the day to try again now.
Many thanks
>> Edited by keren29 on Saturday 9th April 21:32
Many thanks
>> Edited by keren29 on Saturday 9th April 21:32
Gassing Station | Porsche General | Top of Page | What's New | My Stuff