check engine light at 65mph

[1stGenRunner]

hi guys im new here i just bought a 86 sr5 with 325k on it and it runs great but for some reason when i go 65 or above my check engine light comes on when i let off the gas and slow down a bit it goes off an ideas what it could b? its a 5speed and has absolutly no leaks

 

[Sidney]

About half of the ECU codes stored on the first & second generation EFI Toyotas don't show a constant blinking check engine light therefore you must pull the ECU codes to see if a fault is registered.

To pull the ECU codes:

All 1980-1995 and including 1995 EFI equipped vehicle allow you to find engine and related faults by pulling the ECU (computer) codes without the need for a handheld OBDII diagnosis scanner, the sites listed below have the fault codes needed to pull the codes and the instructions on how to do it:

http://autorepair.about.com/library/ts/obd-i/bl-dtcs-36.htm
http://autorepair.about.com/library/ts/obd-i/bl-dtcs-53.htm
http://autorepair.about.com/library/ts/obd-i/bl-dtcs-71.htm
http://autorepair.about.com/library/ts/obd-i/bl-dtcs-90.htm
http://www.autozone.com/az/cds/en_us/0900823d/80/16/11/12/0900823d80161112/repairInfoPages.htm
http://www.off-road.com/toyota/tech/codes/index.html
http://www.4crawler.com/4x4/CheapTricks/index.shtml#TimingCheckConnector
http://www.4crawler.com/4x4/CheapTricks/Images/85diagnosticcodes.gif
http://lcengineering.com/TechNotes/TechNote12.htm
http://lcengineering.com/TechNotes/TechNote13.htm
http://www.geocities.com/MotorCity/Pit/9975/dataBySubject/Engine.html
http://www.mad-mechanic.com/toyota/toyotaobd.shtml#obtaincode
http://www.freewebs.com/th3duke/22RE-ECU.mht
http://www.troublecodes.net/Toyota
http://www.autoshop101.com/forms/h27.pdf
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx
http://forum.ih8mud.com/79-95-toyota-truck-tech/201623-toyota-2lte-error-codes.html
http://www.showmesome.info/hilux/info/manuals/1KZ-TE/Page0096.htm
http://www.efisakh.narod.ru/at_toyota.htm (auto tranny codes)
http://www.usatransdoctor.com/foreigntoyota.htm
http://www.obd-codes.com/forums/viewforum.php?f=3

Pulling the ECU (EFI computer) codes is the first thing I do to diagnosis a problem thereafter I reset the ECU to see if the same problems show up and if so I then take voltage measurements at each ECU wire both with the engine running and not and compare with the factory service manual, I also close the ignition switch after a cold engine and also after a warm engine and compare the resistance values with the factory service manual.

This technique will completely isolate your problem without having to do trial and error and it is the technique I use when repairing tv's, vcr's, home/car audio.

In North America the 22R & 22R-E s are used in the following:

22R
1981-82 Toyota Corona
1981-83 Celica
1981-87 Toyota pickup (up to 1990 on 2wd)
1984-87 Toyota 4-Runner

22R-E (22REC=California emissions=extra charcoal canister)
1983-85 Celica
1985-95 Toyota pickup
1985-95 Toyota 4-Runner

22RTE (Turbo EFI)
1985-87 Toyota pickup
1985-87 Toyota 4-Runner

Free 1985 Toyota 4-Runner & pickup Factory Service Manual:

http://www.functionalfab.com/resources/toyota 4runner.pdf
http://www.ncttora.com/fsm/1985/1985FSM.pdf
http://www.muchadoproductions.com/info/xxx1985toyotatruckfsm.pdf
http://www.truckporn.com/tech/FSM/Toyota/1985fsm.zip
http://s3.uploadline.com/d/4831811/1168232885/1985fsm.zip
http://www.lukemiller.org/toys
http://forums.bauchan.org/portal/viewdownloads.php?rid=41

http://www.subliminaltrips.com/1985toyotatruckfsm.pdf

Free 1987 Toyota 4-Runner Factory Service Manual:

http://rapidshare.com/files/34005580/Toyota.4Runner.1987.1998.SIL.MMedia.RUS.part1.rar
http://rapidshare.com/files/34006565/Toyota.4Runner.1987.1998.SIL.MMedia.RUS.part2.rar

Sidney