[LCML] FJ60 Intermittent Stall at Idle

[Dallas Maddox]

Jeff,

A few suggestions:

1. I would still take a can of brake cleaner, etc.. and when it is idleing
fine - spray around and listen for idle changes.  FJ60's have a mess of
vacuum lines and there could potentially be a vacuum leak somewhere in that
mess, or even at a fitting somewhere.

2. I just had the same symptoms on my 78 FJ40 and when I pulled the top of
the carb off, the "BB" at the bottom of the accelerator pump hole was
corroded solid.  I know that's a pain to check - but I'd check it.

3. Could the "HEET" have possibly broken loose some gunk and your fuel
filter/screen at the inlet line on the carb/jets, etc.. have debri in them?

4. Hotter days now causing vapor lock?

5. Fuel cap not venting causing vacuum on the gas tank?

Just some thoughts,

dallas (ragman)

On Thu, Jun 9, 2011 at 6:48 PM, Jeff Zepp <jeffzepp at earthlink.net> wrote:

> I have an issue with my fully smogged 1987 FJ60 where it sometimes will
> idle just fine and other times will stall when pulling to a stop. We are
> only talking about full normal operating temperature. I have eliminated the
> EGR system as a potential cause by disconnecting the line between the vacuum
> modulator and the EGR valve and capping the line, so the EGR isn't coming
> on. I also verified that the idle cut solenoid is operating.
>
> Backing up in the story a bit, she used to do fine until I had to do some
> work to get her through emissions testing. She failed the first try. So I
> changed out the air filter element, backed the static timing back to stock
> 7° from the 17° she was at, changed the main jet from 147 to 138, and dumped
> 4 bottles of Heet into the remaining 5 gallons of fuel, and then she passed
> with flying colors. She ran like crap though and stalled at idle a lot.
> After passing, I put the static timing back to the 17° that she was running
> good at and put the 147 jet back in, filled the tank back up to dilute the
> methanol. That made her run a lot better, but there is this intermittent
> stalling issue that is really making her a PITA for my wife to drive her.
>
> It is almost as if the fuel (or timing?) is connected to a LSPV: when you
> come to an abrupt stop, as in traffic and press the clutch in, she will
> often stall. If you slow down really gently to your stop, no stall. The idle
> adjustment mixture screw is set at 3 turns. I tried other settings, both
> leaner and richer and neither seemed to make any difference. And besides -
> she used to work just fine before I messed with her to pass emissions. For
> now the brute force fix is setting the idle too high, around 1200-1400 RPM.
> Whenever she gets much below 1000 she wants to stall.
>
> There are no obvious vacuum leaks, although I haven't done a thorough test
> for those. She runs great just driving around. If there is a vacuum leak, it
> would only be under the circumstance of coming to an abrupt stop and putting
> the clutch in. I figure there are about 3 or 4 other emissions subsystems
> which might cause this symptom other than EGR and idle fuel cut solenoid, so
> I am coming to the almighty List to see if anyone has any suggestions for
> where to look and what to test. I have good manuals but am kind of looking
> for a shortcut here.
>
> Thanks and happy cruisin'!
>
> Jeff Zepp
> Kittredge CO USA
> 1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
> Rising Sun 4WD Club, TLCA #4063
> http://rzeppa.org
>
>
> _______________________________________________
> LCML mailing list
> LCML at tlca.org
> http://tlca.org/mailman/listinfo/lcml_tlca.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://tlca.org/pipermail/lcml_tlca.org/attachments/20110609/54c9ee81/attachment.html>