Corvette ZR-1/LT-5 Help

[nibsy]

Hi, I'm having problems with the engine on my Corvette. It fails the self test.
I was initially unable to get it centred in the adjustment mode, then I managed to get it centred and next time it would not centre again. I noticed that the hall effect sensor between the horse shoe magnet was not attached to the bracket and I suppose thus moving slightly. I've reattached it and it routinely centres now, doing what I guess it's meant to. The engine is thrown to the left and then slowly centres itself.

In engine test mode it is failing. The optos are registering the position, maximum left and right (with a x in the respective box) and I'm also getting figures in test mode when I move the engine by hand. this I think is the position sensed by hall effect for maximum left and right. However, when performing the self test with power applied I'm not getting the numbers and the test is failing.

At the moment I'm blindly adjusting the horse shoe magnet as per... this link. I do however have an adjustment pot on my Corvette engine and the engine does seem to be centering.

Can any one point me in the right direction to get this fully working?
Cheers, Nibsy.

 

[Moonraker]

Have you tried cleaning the optos ?

 

[nibsy]

Correct me if I'm wrong but the optos are only used for max left and right. In test mode I get a noise ad cross in the box showing engine position so that should mean the optos are fine?
I did give them a quick wipe over with a q tip but didn't know what sort of cleaner to use.
I think it has something to do with the range over which the hall effect is working and thus used to calculate engine centre?

 

[Johnnyo]

I wouldn't get too hung up about it if the engine centres and works as it should in play, also it
does not complain after boot up initialisation giving a credit dot.

There is also an adjusting pot on the board with you can adjust thro the hole in the ramp but this is for
centring uses really

 

[nibsy]

Previously it was just over to 1 side so I had to take it apart and found the hall effect sensor loose. It's such a pain to take apart I'd like to get it fully working before putting it all back together.

 

[Johnnyo]

Yes I agree it is a pain to take apart but the hole in the ramp is for adjusting
the centre position via the pot on the board .

That is if you have the adjustable board and hole in ramp



see attached manual ammendment

 

[Moonraker]

I did give them a quick wipe over with a q tip but didn't know what sort of cleaner to use.

IPA (aka Alcohol) such as this http://uk.rs-online.com/web/p/precision-cleaners-degreasers/0567890/

 

[We Gone]

I know this is an oldie but just what I was looking for.