Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 06-11-2011, 05:18 PM   #1
StonecoreTx
Intake
 
Join Date: Dec 2009
Location: Austin,Tx
Posts: 41
StonecoreTx is on a distinguished road
Default no start,cps questions

Just recently my 86.5 mk3 7mgte manual ran fine before parked but now it just cranks and cranks and just won't start. happened once before but I wiggled the cps connector wires and she started right back up.

I think I dont have spark, I used a spark tester and no spark but coils fine soooo.... cps..?

this time I decided to take the dust cover off of the cps and noticed it wasn't aligned how I've seen it aligned before.

the first picture is how my cps looks as is still on the car with cover off.




the second picture is from shaeff's cps alignment write up, as you can see mine is way off or is it supposed to be at TDC to line up? some1 point me in the right direction here.


__________________
86.5 mk3 supra 7mgte r154
StonecoreTx is offline   Reply With Quote
Old 06-11-2011, 05:54 PM   #2
btwilson86
Super Moderator
 
btwilson86's Avatar
 
Join Date: May 2007
Location: Billings, Montana
Posts: 1,034
btwilson86 is on a distinguished road
Default

Yes, that's with the engine at TDC on the compression stroke.
__________________
1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
btwilson86 is offline   Reply With Quote
Old 06-11-2011, 09:27 PM   #3
StonecoreTx
Intake
 
Join Date: Dec 2009
Location: Austin,Tx
Posts: 41
StonecoreTx is on a distinguished road
Default

soooo... mine (fig.1) is in different position because the engine is not set to TDC/compression stroke? it's about an inch off compared to shaeff's (fig. 2)

is this normal?

setting the crank to TDC will move it to the original position like in (fig.2) ?

(I appologize but I've never seen or worked with this kind of sensor before..)
__________________
86.5 mk3 supra 7mgte r154
StonecoreTx is offline   Reply With Quote
Old 06-12-2011, 12:12 AM   #4
87supra7mgte
3" Exhaust
 
Join Date: Apr 2011
Location: Tacoma, WA
Posts: 63
87supra7mgte is on a distinguished road
Default

yes it is normal, as the engine rotates so does the CPS. it is gear meshed witht the cams and spins with them, its basically like a distributor but instead of using points of contact to send the spark through wires it sends a signal to the coils.
__________________

87 supra, 7MGTE, head gasket and turbo replaced, runs and boosts! fixing wiring odds and ends, then storage for a year basically...then comes big money cash in er, lookin for 500+ to the ground and a very sleek, sexy mkiii
87supra7mgte is offline   Reply With Quote
Old 06-14-2011, 04:07 PM   #5
ksd9000
Stock
 
Join Date: Apr 2011
Location: Texas
Posts: 10
ksd9000 is on a distinguished road
Default

Follow the instructions at the link below. Also, if you have not removed the CPS or done anything else to cause it to be out of alignment since last start up, then its most likely not the sensor alignment. I had the same issue as you. Came to find out the wires on the harness side of the CPS connector were barely making a contact inside the back of the connector. Once I fixed this, the car has had no issues. There is a lot of heat on that side of the engine due to the exhaust being on the same side. Also you state that wiggling the wires caused it to start the last time. That would lead me to believe that there is a connector issue and not an alignment issue.

Also, when installing the CPS per the TSRM, the pick up will rotate as you push the CPS in place. Since the CAM and sensor both have helical gears, its unavoidable. The instructions account for this and so you do not (should not) compensate for the movement when installing. Once done, you can set the final timing as described in TSRM as well.

http://www.cygnusx1.net/Supra/Librar...ection=IG&P=21

Hope this helps......
ksd9000 is offline   Reply With Quote
Old 06-14-2011, 06:51 PM   #6
El Supracabras
3" Exhaust
 
El Supracabras's Avatar
 
Join Date: Feb 2010
Location: Chicago
Posts: 240
El Supracabras is on a distinguished road
Default

+1 about the wiring. It is the supra's weakness. If you didn't take out the CPS it is not likely it's alignment will be the problem.
If you need to drive it right away, just cut the connector off and use heat shrinking butt-connectors to connect the wires together until you can properly repair the connector. This is not the cleanest way to repair it, but it is very fast, cheap and effective. I have also successfully replaced this connector with Weatherpack (GM) 4 wire connectors from NAPA. It is a much better connector.
If you have the time to repair it cleanly, back probe the connector with a ohmmeter to find the bad connection and replace or repair the offending pins.
El Supracabras is offline   Reply With Quote
Old 08-15-2011, 08:26 PM   #7
StonecoreTx
Intake
 
Join Date: Dec 2009
Location: Austin,Tx
Posts: 41
StonecoreTx is on a distinguished road
Default

I really appreciate the info. I will be getting a weatherpack GM 4 wire connector this week and swap out the old one.
__________________
86.5 mk3 supra 7mgte r154
StonecoreTx is offline   Reply With Quote
Old 08-16-2011, 11:09 PM   #8
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

el supra. wanna touch more on the wiring of the cps. I wanna do that. same with my afm.
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :

Green7mgte is offline   Reply With Quote
Old 08-17-2011, 02:28 AM   #9
El Supracabras
3" Exhaust
 
El Supracabras's Avatar
 
Join Date: Feb 2010
Location: Chicago
Posts: 240
El Supracabras is on a distinguished road
Default

Not much to touch on as far as the wiring goes, it's only 4 wires. Just do them one at a time if you don't trust your memory or schematic deciphering skills. If you just want to change the cps connector I'm gonna do one this week, I will take some pics. It's very easy and I will be using the Weatherpack connector.
El Supracabras is offline   Reply With Quote
Old 08-17-2011, 02:13 PM   #10
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

yea please, keep me posted. So what you just cut it from the connector and wired them in again one at a time.. I could do that. Was thinking about ordering the replacement from driftmotion.
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :

Green7mgte is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
7mge build with some questions. 87hilux7mge MKIII Supra 34 06-11-2014 09:04 AM
Questions before buying a Supra proximityburn MKIV Supra 5 08-15-2008 02:09 AM
Questions about the oem fuel system Magical Trevor MKIV FAQ 7 08-19-2007 04:40 PM
Need your gus help- a few questions ravenmaster MKIII Supra 10 10-21-2006 09:59 PM
newbie questions erik MKIII Supra 4 01-10-2006 11:37 AM


All times are GMT. The time now is 10:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87