Re: Fuel mixture on 5KTQ?

[ejfluhr@austin.ibm.com (Fluhr)]

>Between the two halves is a small vertical tube with (hopefully) a cap 
>(yellow or blue or in some cases a metal plug) in it.  This cap has not been 
>present on any of the four cars with Bosch FI that I have bought - this 
>allows unmeasured air to get into the system - not a good idea - obviously 
>many mechanics who work on these cars haven't a clue about Bosch FI.  If you 
>remove the cap, and insert a long 3mm Allen key, you can adjust the position 
>of the fuel control arm relative to the air flow measuring arm.  This 
>adjusts the mixture.  DON'T REV THE ENGINE when the Allen driver is inserted 
> - I think it can put strain on the bearings (I've done it once or twice by 
>mistake, and haven't noticed any ill effects, but all the manuals carry this 
>warning).


Does the CO adjustment screw hole actually allow unmetered air into the
intake tract if left unplugged?

I thought it let _unfiltered_ air, but cannot see how it allows unmetered
air in there.  At any rate, does the dealer sell caps for the hole (not
metal plugs)?

Later,
Eric
'85 Coupe GT
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Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
630FP Logic/Circuit Design                   Phone:  (512) 838-7589
IBM Microelectronics Div.                    Austin, TX