Just noticed that the idle micro switch on the 84 was loose and not being activated with throttle closed, I have adjusted it. I got rushed out by the Wife before I could test drive but could this be a reason why the RPM's drop so quickly between shifts ?

 

fsharp9. The idle switch is I think supposed to lower injector pulse width with throttle closed. think it helps prevent backfiring from to much fuel to air ratio. I think that's called overrun. Maybe the PO did loosen the mounting for some reason. Test the switch operation w/ multi meter. should be open ckt when operated and closed ckt when not operated. f#9 makes me think you're a music man?? I forgot to ask if it was the upper or lower switch?

 

Lower switch , screws were loose , according to the meter the switch is fine,and yes , I have been a professional touring /session guitar player ( Gun for hire ) since '89 ......Big hair and Marshall days

 

I noticed the same on my 84 (microswitch not engaged at idle). I haven't gotten around to messing with it yet. How did you manage to adjust it? Was it necessary to remove the spider or can the screws be reached with a long screwdriver?

Hugo

 

hb253. Very easy to adjust with short screw driver. With throttle closed just raise up on the switch body until you see a closed ckt using a test lite or ohm meter.

 

Fender man myself playing classic rock for many years

 

Nice, 3 Strats a '64 , '85 and 2001

 

I used a long screwdriver and removed the drivers intake tube

 

After an hour or two of cleaning/treating the seats with Lexol, I took a quick look at the microswitch setup again. I might have been able to get a super-stubby screwdriver in there when I was 5 years old, but not now. Looks like I'll need to remove at least one intake tube and even then, it's looking "interesting".

Hugo

 

Two strats. 72 reissue and a jap model from the 80's with a Floyd rose bridge and a fender evil twin.

 

no need to pull the runner. It's tight but a stubby worked for me. No kids in your area with small hands?

 

When the idle switch is closed (off-throttle) and the engine RPM is above ~1200 IIRC, the L-Jet shuts off the injectors to save fuel, that way when you coast down a hill in gear you aren't burning any gas and you get an engine braking effect. Once engine RPM falls below ~1200 RPM the L-Jet fires up the injectors so the engine doesn't stall.

 

Well I was close. Just repeating from another source...

 

The popping on overrun was what I wanted to fix. Today, I finally got around to adjusting the switch. You guys were right, a long screwdriver (along with removing the air intake tube) was sufficient to loosen the screws, move the switch and then tighten. A test drive confirmed that popping on overrun no longer happens.

FSharp9, I didn't notice any change in behavior in RPM drop betweem shifts, so I would say your issue is probably unrelated.

Hugo