Re: Two Questions: '88 5ktq

[Greg & Britt <image_one@earthlink.net>]

Daniel Hussey wrote:
> 
>   I have two questions concerning an '88 5ktq:
> 
>   1.  Can you check to see if you have a faulty idle control switch by "pulling
> the codes"?  Or, is this a guess, replace, and see if the problem goes away?

Just fixed my 87 5KT yesterday, had an intermittent low boost situation.
Turned out to be broken solder connections where the WOT switch is
connected inside the housing. While it was apart I checked the
resistance on the idle switch, which turned out to be 5 ohms. A little
contact cleaner brought it down to 0 ohms. Not only did the boost return
to normal, but starting and idle are much improved. Checking the
resistance per the manual is the way to go.

>   2.  Were the '88 5ktq's identical to the '87's?  I read somewhere that the
> '88's were slightly higher compression.  Is there any truth to this?  All 5ktq'
> s I'd driven all seemed about the same, regardless of year.  But so many of
> them are different when the get older, it is hard to tell.
 The Bentley says their the same, 7.8:1. KH motors (84 early 85) were
8.3:1.

GT
84 5KT
87 5KT