bshow

Toyota Service Bulletin Vol 10 Number 11 dated 10_20_89 talks about a hot soak starting and idling problem. The problem, as I understand it, is basically temp sw #2's temp is set too high. This temp sw controls vac/atmosphere going to the fuel press regulator. The service bulletin changes temp sw #2 to allow a lower turn on temp, allowing atmospheric pressure to the fuel pressure regulator at a lower temp, increasing fuel press at a lower temp and thus eliminating the hot soak problem. I am having a problem exactly as described in the service bulletin and need temp sw #2, part number 89428-26020. However, my Toyota dealer says the part is discontinued. Anyone know where I can get the part or how to do an alternate fix? The service bulletin says the temp sw was changed in 1988. Does this mean the part number also changed for the 1988 model?

4Crawler

iTrader: (3)

You could always try eliminating all that stuff and just hook the fuel press. reg. to constant vacuum:
- http://www.4crawler.com/4x4/CheapTri...ne_Pix/10.html

MudHippy

I found it, but it isn't available everywhere these days. 1stToyotaParts.com is always the place to look for discontinued parts. If anybody is still selling it, it's them.

-City Slicker

Where is this indicated "Switch, Temperture -#2" #(89428-26020) located in the engine ?
or the faulty original switch #(89428-2428) ..


the picture above is of a hose*!?


/??

[QUOTE]
PilotDan:
I had this very same problem with my 1986 22RTE for 20+ years. I visited my dealer many times over the years in an attempt to isolate my problem and fix this hard starting/rough idle when hot situation without success. Finally I read somewhere that Toyota had come out with a Technical Service Bulletin way back in 1989 that identified my problem and provided a solution to fix the condition.

The fix involves replacing the temperature switch P/N #89428-2428 with P/N #89428-26020 which reduces the temperature the switch activates the fuel-up system from 110 degrees C (230 degrees F) to 60 degrees C (140 degrees F) and replacing the cold start injector time switch P/N #89462-30011 with P/N #89462-20050 which increases the temperature at which the start injector time switch activates the cold start injector from 35 degrees C (95 degrees F) to 45 degrees C (113 degrees F). Also for vehicles equipped with air conditioning, the ACV terminal wire to the ECU must be disconnected to prevent the idle up from working continuously after warm up.

I replaced these sensor switches and disconnected the ACV wire from my ECU and now my truck starts up perfectly and runs smoothly no matter if I start it up cold or hot.

If you have this same problem you can read the full text of Toyota's fix by getting a copy of TSB ENG011892010.

Good luck,

Dan /QUOTE]
^from
http://www.22rte-trucks.com/simplema...ic=661.15;wap2


i found this online.
& i have this same problem..

-City Slicker

cool just found this ...

diagram on how to fix the problem(s) with *85-87 22R-E/&/R-TE's

http://www.google.com/url?sa=t&rct=j...47008514,d.cGE

^ automatic download of TOYOTA's Service Bulletin
-recall diagram/instructions as PDF file

pimacdaddy

I have this same issue and I am wondering will PART NUMBER 89428- 20050 replace 89428-26020 ? Can't find it anywhere.

https://parts.camelbacktoyota.com/oe...ItNGwtbDQtZ2Fz

Also....Will PART NUMBER 89428-28030 replace 89428-26020 ?

https://toyotaparts.bochtoyotasouth....2828030?c=az0x

THIS IS CONFUSING HELP SOMEONE !!!!

pimacdaddy

hey 4Crawlee do you have more soecifics where do the hose attach to on the left side of the plenum ? I still got my hot soak issue

4Crawler

iTrader: (3)

Vacuum hose connects between the fitting on the fuel pressure regulator on the injector rail to a vacuum port on the side of the intake manifold. Just eliminate the vacuum switching valve (VSV) that used to sit in between those 2 connections.

pimacdaddy

ok so you just run the vaccum line all the way instead of it being intercepted by the vsv right ? What about trying a different vsv ? I found some in my spare parts

4Crawler

iTrader: (3)

Unless your old VSV is broken, no need to try another one. I just eliminated that part on my engine over 20 years ago. It's not so much the VSV that's the problem, it's what controls it and tells it to interrupt the vacuum signal to the fuel pressure regulator (FPR) that seems to be the issue. The basic function of that vacuum line is to send manifold vacuum to the top of the FPR, high vacuum = low engine load = low fuel pressure = less fuel flowing through the injectors. Low vacuum = high engine load = high fuel pressure = more fuel flowing through the injectors. I found there were times that VSV was turning on and making the engine run way too rich at certain times.

pimacdaddy

Thank you now I understand its very well put out. I wonder if that would have anythin to do with my re occurimg intermittent code 5 ive been having for a long time... swapped the 02 sensor. Check the wiring for ground. Rebuilt all injectors 2 yeard ago... FPR tested and is fine. Relatively new fuel pump... The CEL comes on at steady cruising if I let go of the gas pedal it usually leaves within seconds..

4Crawler

iTrader: (3)

Easy way to find out, just bypass the VSV and see if anything changes.

pimacdaddy

4Crawler

iTrader: (3)

Looks like it should work, just need to get vacuum to the top of the FPR.

pimacdaddy

Yea this is where it connect to, from the botom evap I reckon its called ? To the fuel pressure reg.

about to give it a try.

pimacdaddy

So far so good tested it 3 times and didnt have the hot soak hard start low idle issue. Still got a code 5 though. Not entirely sure if I smell gasoline more now that the vsv is deleted or if it has to do with my code 5.. Thank you for all your help !

pimacdaddy

so drove a bunch and when I am back in neutral, idle will somehow have a miss at like 700 RPM ? and after maybe 20 seconds or so, perfect idle will resume and reach its 950 rpms