94 STI
19 July 2004, 10:30 AM
#1
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
94 STI
Hi all I'm new to the site, I just bought a 94 sti on friday. I'm having a problem with it at the moment. I just want to see what you guys think. when the car hits about 4500 rpm its like as if the car is running out of petrol. for a few sec then its it take off again it just happens when the car is betwen 4500 and 5500 rpm.. could it be the fuel filter.. the car was sitting up 2years before I bought it,
19 July 2004, 12:57 PM
#3
Former Sponsor
iTrader: (4)
Join Date: Jan 2001
Location: ECU Mapping - www.JollyGreenMonster.co.uk
Posts: 16,548
Likes: 0
Received 2 Likes
on
2 Posts
sounds like overboost.. try cleaning the boost solenoid..
spray brake cleaner into it.. hopefully someone else can post a picture for you to locate it.
Either that or you are running it on unleaded only rather than super unleaded + booster??
Simon
spray brake cleaner into it.. hopefully someone else can post a picture for you to locate it.
Either that or you are running it on unleaded only rather than super unleaded + booster??
Simon
19 July 2004, 01:55 PM
#4
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
Yep the car is running on unleaded .. will thats be the cause of it ? I was told that it will run unleaded,
Originally Posted by Jolly Green Monster
sounds like overboost.. try cleaning the boost solenoid..
spray brake cleaner into it.. hopefully someone else can post a picture for you to locate it.
Either that or you are running it on unleaded only rather than super unleaded + booster??
Simon
spray brake cleaner into it.. hopefully someone else can post a picture for you to locate it.
Either that or you are running it on unleaded only rather than super unleaded + booster??
Simon
19 July 2004, 02:03 PM
#5
Former Sponsor
iTrader: (4)
Join Date: Jan 2001
Location: ECU Mapping - www.JollyGreenMonster.co.uk
Posts: 16,548
Likes: 0
Received 2 Likes
on
2 Posts
you should be running SUPER unleaded as a minimum.. Shell Optimax is the best and you might well need to put booster in it.. Jap fuel is 100RON uk normal unleaded is 95RON and Optimax 98RON.. you will kill the engine with it detting otherwise.
Simon
Simon
Trending Topics
19 July 2004, 04:53 PM
#13
Scooby Regular
iTrader: (3)
Join Date: Aug 2000
Location: 1600cc's of twin scroll fun :)
Posts: 25,565
Likes: 0
Received 2 Likes
on
2 Posts
Even if the car was sitting for 2 years it should have been serviced, if not you dont know what has deteriorated 
Did you buy the car from a trader or a private owner??
If it was from a private owner and they recommended unleaded fuel you dont know what sort of damage it could have done to the engine
You need to get the car serviced ASAP, there are alot of speciallists around, cambelt should be a priority if the car has been standing for 2 years and not serviced. You also need to invest in a Knocklink and sensor, available from here>> www.jap-innovations.co.uk
Tony
Did you buy the car from a trader or a private owner??
If it was from a private owner and they recommended unleaded fuel you dont know what sort of damage it could have done to the engine
You need to get the car serviced ASAP, there are alot of speciallists around, cambelt should be a priority if the car has been standing for 2 years and not serviced. You also need to invest in a Knocklink and sensor, available from here>> www.jap-innovations.co.uk
Tony
19 July 2004, 05:01 PM
#14
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
thanks tony I'll look into that , I bought the car from a dealer.. I have just got another problem with its now when turbo is at full. there is a loud screak out of it. but car dont lose performance. would this be the waste gate getting stuck?
19 July 2004, 05:31 PM
#15
Scooby Regular
iTrader: (3)
Join Date: Aug 2000
Location: 1600cc's of twin scroll fun :)
Posts: 25,565
Likes: 0
Received 2 Likes
on
2 Posts
Depends?
If it sounds like someone blowing over a milk bottle type whistle then it could well be the wastegate, have a look here> www.sidc.co.uk and look under faq's, there use to be some known problems with certain years of cars, i dont think it was for a 94 car but it can still happen.
Still best to get the car serviced and see what they can find from that
Tony
If it sounds like someone blowing over a milk bottle type whistle then it could well be the wastegate, have a look here> www.sidc.co.uk and look under faq's, there use to be some known problems with certain years of cars, i dont think it was for a 94 car but it can still happen.
Still best to get the car serviced and see what they can find from that
Tony
19 July 2004, 08:25 PM
#16
Scooby Regular
Join Date: Oct 1999
Location: PLYMOUTH
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
Using the wrong fuel won't make it cut out like that.
BUT use the right fuel anyway.
Where are you, take it to someone who can fix it properly, you may get some good advice on here but you may also get total crap!!
Could be lots of things.
BUT use the right fuel anyway.
Where are you, take it to someone who can fix it properly, you may get some good advice on here but you may also get total crap!!
Could be lots of things.
20 July 2004, 10:05 AM
#17
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
the fuel seem's to have worked, But any ideas why there is a loud screch out of the car at about 6000 rpm.. in all gears, is it the turbo ??????
21 July 2004, 11:12 PM
#19
Scooby Regular
Join Date: Aug 2001
Posts: 1,355
Likes: 0
Received 0 Likes
on
0 Posts
loud screech could be a lot of stuff, from turbo bearing (likely to cause blue smoke) to a hole in the exhaust under the heatsheild. More information is needed, please?
And the wrong fuel CAN make the car hesitate, as the ECU will detect detonation and pull timing.
And the wrong fuel CAN make the car hesitate, as the ECU will detect detonation and pull timing.
22 July 2004, 08:10 AM
#20
Former Sponsor
iTrader: (4)
Join Date: Jan 2001
Location: ECU Mapping - www.JollyGreenMonster.co.uk
Posts: 16,548
Likes: 0
Received 2 Likes
on
2 Posts
Originally Posted by wideybrook
Using the wrong fuel won't make it cut out like that.
The ECU will detect the det and retard timing and if you are luck as they were cut the boost etc.. and make you noticed something is wrong.
Very glad the fuel change solved that problem.
22 July 2004, 10:03 AM
#21
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
There is no Blue smoke. the loud screech only happends after 6000rpm .. the car was sitting up for two years.
Originally Posted by Turbo_Steve
loud screech could be a lot of stuff, from turbo bearing (likely to cause blue smoke) to a hole in the exhaust under the heatsheild. More information is needed, please?
And the wrong fuel CAN make the car hesitate, as the ECU will detect detonation and pull timing.
And the wrong fuel CAN make the car hesitate, as the ECU will detect detonation and pull timing.
22 July 2004, 10:42 AM
#22
Scooby Regular
Join Date: Aug 2002
Posts: 39,877
Likes: 0
Received 0 Likes
on
0 Posts
It is vital that you use SUL on this car and preferably Optimax. That rev range is the most susceptible to detonation and the damage being done to your engine is enormous.
My MY94 STi is quite happy on Optimax running 16 psi boost without booster, but I would not run it on any lesser petrol. I do have a Knocklink fitted.
It is a superb car all round, you are lucky to have one. Well worth taking good care of it. Check with Marky San on the register for early Sti's.
Les
My MY94 STi is quite happy on Optimax running 16 psi boost without booster, but I would not run it on any lesser petrol. I do have a Knocklink fitted.
It is a superb car all round, you are lucky to have one. Well worth taking good care of it. Check with Marky San on the register for early Sti's.
Les
22 July 2004, 01:24 PM
#24
Scooby Regular
Join Date: Aug 2001
Posts: 1,355
Likes: 0
Received 0 Likes
on
0 Posts
Good point: would STRONGLY reccomend a Knocklink to any STI drivers out there.#
The screech really could be anything, mate.
It COULD be something as simple as a vibrating heatsheild, or a crack in the exhaust whistling (exhaust is covered in metal heat-sheilds, so can sound awful if it leaks).
I very much doubt it's the turbo, as that would not be RPM specific, but tend far more to make the noise at a prescribed boost level / engine load.
As it's RPM related, and comes and goes, I can't help but think this is something vibrating / resonating. My first reaction is to tell you to lift the bonnet and look to the left of your intercooler at the gearbox oil dipstick. Is this resting against the intercooler / bodywork of the car / turbo heatsheild or anything else? It shouldn't be! These can sound awful if they start vibrating against anything.
The screech really could be anything, mate.
It COULD be something as simple as a vibrating heatsheild, or a crack in the exhaust whistling (exhaust is covered in metal heat-sheilds, so can sound awful if it leaks).
I very much doubt it's the turbo, as that would not be RPM specific, but tend far more to make the noise at a prescribed boost level / engine load.
As it's RPM related, and comes and goes, I can't help but think this is something vibrating / resonating. My first reaction is to tell you to lift the bonnet and look to the left of your intercooler at the gearbox oil dipstick. Is this resting against the intercooler / bodywork of the car / turbo heatsheild or anything else? It shouldn't be! These can sound awful if they start vibrating against anything.
22 July 2004, 02:41 PM
#25
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=Turbo_Steve]Good point: would STRONGLY reccomend a Knocklink to any STI drivers out there.
Sorry for been so stupid now but what is a Knocklink????????
Sorry for been so stupid now but what is a Knocklink????????
26 July 2004, 02:24 PM
#26
Scooby Regular
Thread Starter
Join Date: Jul 2004
Location: Waterford Ireland
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
I think I might have a few problems ??? 
.. I put a dump valve on the car. and now the car is idleing high. only sometimes after a drive!! or i might have a leak in some of the vac pipes or intercoolier.
Can someone help please .. I love my car I dont want to have to get rid of it because of a problem
.. I put a dump valve on the car. and now the car is idleing high. only sometimes after a drive!! or i might have a leak in some of the vac pipes or intercoolier. Can someone help please .. I love my car I dont want to have to get rid of it because of a problem
27 July 2004, 09:25 AM
#27
