Unfortunatly I don't know what could
exactly be causing that but all I can say is WOW THAT IS LEAN!!!
But yes do check for vac
Is there an adjuster screw on the lexus
----- Original Message -----
Sent: 24 December, 2003 2:59 PM
Subject: [sconz] Lexus Mod Problem
I have recently fitted 550cc injectors plus a
Lexus air flow meter to my
7MGTE. Before fitting them I checked my standard
mixture with an air/fuel
ratio meter and it was fairly constant at
Since doing the Lexus mod the upper mixture stays pretty much the
idle mixture on startup is about 16.5 then goes back to 14.7 after
When throttling off during deceleration the mixture leans out
goes off the scale (>20:1).
I have checked heaps of
things, changed my AFM sensor, throttle body (had
bored mine out to 65mm,
have reverted to a standard 60mm one now), adjusted
the TPS position as per
TSRM but this has not fixed the problem.
Thought it may be
1. Faulty TPS (when I had it off it seems to spring back very
slowly and as it
appears to be pushed up by the throttle body and returns by
it's own spring I
wondered if it can't close as quickly as the throttle
2. The modified Lexus AFM screw is not long enough (It's roughly the
length now as on Reg Riemers article, and it's wound all the way
3. The computer needs more time to learn the new setup.
4. There's a
leak somewhere after the throttle body which draws in un-metered
the throttle body is closed and the plenum vacuum increases.
I don't want
to cause any damage to the engine by this 'leaning out', is this
Anyone got any ideas?
Supra Club of New Zealand