Just put my S1 back on the road, last year I took it to John Nobles cos it was hesitating under boost, and even now its still doing it… its fine when the airs really cold but most times its holding back. I don’t know why but its got a Series 2 ECU on it a mate said that my trouble will be this cos series 2’s have a knock sensor unlike the S1, I have a series 1 ECU which i did fit for a short test ages ago but this made no diff, Nobles never said anything about the ECU, they just changed a vacuum pipe but if it is the ECU then why would the S1 type not work, would the car need setting up to run right? Its all standard apart from the exhaust and filter. Been told to send my S1 ECU down to Carl Norris, then have the car set up. Anyone had similar faults or any ideas?

 

I always thought that an S1 would not work with an S2 ECU because of the knock sensor.

Be ok the other way round though.

 

Yeah... thats what i heard but it runs ok when the airs cool, what does the knock sensor do and what effect should this have on a series 1? Cheers

 

the knock sensor detects detonation (knock) and retards the ignition. get an S2 ECU or your car will neve run properly.

 

My S1 has a S2 ECU on already bud, you mean get S1 ECU right? Will i then need the car setting up? Thanx

 

yea sorry my mistake, get an S1 ECU typed it too fast lol sorry man. If the car is std, std boost/ignition etc then it wont need a set up, bu will probably benefit from one!

 

I was told that a S2 ECU of 86 will work in a S1, but later S2 ECU's will not. Something to do with the wiring loom I believe.

Maybe there is something wrong with the intercooler?
In colder weather you maybe do not notice, but in warmer weather when you really need the IC, the fault might come to the surface.

 

Intercoolers can't really go wrong, unless there is something blocking the fins, like a big bit of cardboard

 

an early S2 ecu may work, that doesnt have the knock sensor, but i dont kno what one. just get an S1 ecu

 

The ECU on it is Blue Red Black... not sure if thats an early S2 one or not.. i'll get the correct 1 on and have it set up, unsure whether or not to leave it standard. What do u reckons a reasonable increase to aim for?, engine seems fine but its just gone past the 100,000 miles mark with FSH.

Bloooooody fuel pumps making at right noise now, like its running empty when its still showing a 1/4 full, not had chance to check it over but wondered if anyone has had this problem themselves? Any ideas... not sure if this could also be causing the other problem i've been having although its only just started doing this the past couple of days.

Cheers all for your help, appreciate it!

 

nicorsts1,

The ECU u have on will NOT work on ur car. As said, it is looking for a knock sensor input, and it doesnt have one. It's the same as unpluging the knock sensor on an S2 - the car will hesitate quite badly. Blue Red Black is an 87-89 S2 ECU. Fuel pump sounds like it needs replacing.