my 93 has had rock solid 750 rpm idle since the day I bought it three years ago and 75000 miles ago.

last night while on the freeway, I noticed a bit of surging, kind of like a gasser will do when not jetted correctly. then it seemed to go away.

when I get home I always let it idle for a bit before shutting down cause its quite a clime in elevation to get there... but this time, it idles at 1000 rpm.

this morning, cold. still idles at 1000. drive to work and sitting in the parking lot, idle is wandering all over 1000 -1200. even surges up to 2000 and hangs for a second, then back to 1000.

Ive never touched any of the adjustments because the PO really set it up nice and it worked perfect.

does the 3200 spring wear out after some time?
can the full power or idle screw change? I havent reached back to check the locknuts yet, its been dark.

just wanted to get some opinions.
thanks in advance,
Justin

 

the springs don't wear out,they can break but I dont think thats your problem.
check the obvious things like linkage. but it sounds like something in the pump has gone haywire

 

I did jiggle the throttle linkage and the arm is bottoming out ok on the pump. Ill totally disconnect linkage tonight and play with it, but it seems the same as before.

Im going to see if I can adjust the idle stop screw, but it sure acts like a governer problem. if it was the idle screw, it wouldnt be hunting like it does.

 

has anyone had a broken governer weight?

reading through all the VE stuff, it seems like this is the only thing that can do this...

ay thoughts from the VE pros would be greatly appreciated.

 

could be a possibility. a broken or missing flyweight, to me, seems like it would make the motor act like it wants to runaway. makes sense to me that one less weight would equal less pressure against the governor sleeve, which moves the lever connected to the metering sleeve on the plunger. in turn, allowing a longer stroke before the spill port on the plunger is exposed from under the metering sleeve.

check this out: Robert Bosch VE Pump Operation

 

thanks,
yeah if I cant find something obvious, Im going to pull it.

Id like to keep it and rebuild the one I have, who can I buy a rebuilt pump from who wont charge me $500 for a core?

J

 

Have you checked the idle spring?

 

I messed with it last night, and the idle adjustment does not let it idle any lower.

I backed off the power screw about 1 turn and drove it. after a few blocks it would barely run when in gear and nutral would idle about 750. also couldnt get above 1000F on the EGT.

pulled it backin the garage and slowly turned up the power screw until it would idle about 750 in gear.

so the total change was about 1/4 turn out on the power screw. and now it runs just great without seeming unstable at all. weird.

what could have changed? will the idle spring do this?

thanks.