Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 928 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Iím always the ďonly oneĒ in my neighborhood, even around Toronto, so I know how to tune out the noise. To their credit they are polite and say great job, but I know they say indoors, Ďfilthy gaijin, bringing their dirty habits to our clean country.í
Thatís ok so long as I can enjoy my whips.
Here no one bothers me. In Toronto neighbor and cops were forever in my business. Once I was stopped 3 times in 1 week for a spot check. My mechanic in Toronto no longer drives customers cars because of the attention. In Tokyo the vulgar display of wealth on the roads here was truly astonishing to me. Daily I see McLarens and Lambos.
So long as there are no dead bodies hanging in front of my house I think Iím good.


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-12-2018, 12:30 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #201 (permalink)
Registered User
 
stepson's Avatar
 
Join Date: Mar 2010
Location: Texas
Posts: 1,576
Did you take the engine out the bottom?

P.S. I was kidding about the neighbors and the Bonzai tree.

Hopefully you were kidding about the bodies hanging outside your house.
__________________
John Curry (Drift King) 928OC member
Grand Prix White 1994 GTS AT (The GTS)
Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson)
Black Metallic 1984 Euro S 5 speed (The Schwartz)

Last edited by stepson; 10-12-2018 at 10:04 PM.. Reason: addition
Old 10-12-2018, 10:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #202 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Yup. From the bottom.
No worries. My skin is quite thick. Unlike my poor attempt at gardening. That shrub refuses to grow any more than that. It was supposed to hide my tool box, parts etc. Man putting it back together takes a lot more time. Checked valve timing, installed injectors, alternator, ps pump, radiator, painted valve covers,


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-13-2018, 10:59 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #203 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage

Cam and ignition timing, oiled pistons&cylinders and cams, vacuum hoses, vinegar soaked and cleaned fuel rails, cleaned and painted injectors, heat resistant painted valve covers( scratched on installation), radiator flushed and cleaned, suspension torqued, spark plugs and ignition wires, fresh oil all done. Engine rotates smoothy, timing marks line up on second rotation
To be done are destroyed power steering low pressure line, crank bolt torque, hall sensor connector, coolant refill.
What am I missing?


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-16-2018, 02:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #204 (permalink)
Registered User
 
JK McDonald's Avatar
 
Join Date: Oct 2003
Location: Texas
Posts: 890
Garage
Basics -

Hey Rufrob - You are making good progress - It sounds like you are closing in on firing the motor up soon. It is always nice to see when the Cam Timing Marks all line up. About all you need next will be a few more of the basics - gasoline will probably be important pretty soon now.....

Michael
__________________
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
Old 10-16-2018, 02:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #205 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
I discovered I didnít install the lower timing cover properly so I need to remove both top ones too. The thing is both my 10mm sockets have disappeared to do whatever.



Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-17-2018, 04:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #206 (permalink)
Registered User
 
stepson's Avatar
 
Join Date: Mar 2010
Location: Texas
Posts: 1,576
Quote:
Originally Posted by rufrob View Post
I discovered I didnít install the lower timing cover properly so I need to remove both top ones too. The thing is both my 10mm sockets have disappeared to do whatever.
I hate when I goof something like that up. It seems like it take forever to remove everything you put on afterward to get to the piece you goofed on.

My 10mm sockets always have a way of jumping down underneath the intake into the "V" when I least expect it. Must be a helluva socket party down there
__________________
John Curry (Drift King) 928OC member
Grand Prix White 1994 GTS AT (The GTS)
Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson)
Black Metallic 1984 Euro S 5 speed (The Schwartz)
Old 10-17-2018, 09:55 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #207 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage



Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-19-2018, 07:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #208 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
The Fat Lady started but ran very poorly. Stalled soon after.
Careful wiring inspection found a disintegrated green blue, green white wires in the main harness.


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-19-2018, 07:28 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #209 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Wiring harness swapped but still it starts fantastically but soon stalls. Iíve checked all connections and relays.


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-20-2018, 12:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #210 (permalink)
Network Native
 
Danglerb's Avatar
 
Join Date: Jan 2007
Location: SoCal
Posts: 10,208
I don't know the S4, so I can't point at anything, but most of it is working, not many things do the starts fine and stalls.
Old 10-20-2018, 03:43 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #211 (permalink)
SharkHead
 
JhwShark's Avatar
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 1,027
Garage
I don't know the S4 either. Does it have two Ballast resistors? check them...
__________________
'79 928, 85k Opal Metallic
'99 BMW 540i, 97k Titanium
'72 BMW 3.0 csi, 85k km (euro Deutschland '82) Taiga
Old 10-20-2018, 12:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #212 (permalink)
 
Registered User
 
JK McDonald's Avatar
 
Join Date: Oct 2003
Location: Texas
Posts: 890
Garage
Temp II Sensor -

Hey Rufrob - From your description of what is happening after your car starts - it sounds like you have all the basics (Gas-Air-Spark). This means your computers are both up and running. Perhaps your engine is stalling out from being over fueled. There is a water Temp II sensor that can cause starting and running issues. The S4 928 Temp II sensor works a little different than our S2 set up but have the same function during the warm up cycle.

To test the Temp Sensor II there are two separate temperature sensors housed in the one sensor body. Prong 1 is the sensor for the Electronic Ignition and prong 2 is the sensor for the LH fuel injection. The resistance reading from each prong to the sensor case should be in the range of -

0 C / 32 F: 4.4 to 6.0k Ohm
15 - 30 C / 59 - 86 F: 1.4 to 3.6k Ohm
40 C / 104 F: 0.9 to 1.3k Ohm
60 C / 140 F: 480 to 720 Ohm
80 C / 176 F: 250 to 390 Ohm.

You still can drive the car if the temp II sensor is defective - just disconnect the sensor. The S4 model brains notice that the connector is off and use a pre-programmed warm-up time to adjust the mixture upon start-up. Starting might be a bit harder but once warmed up, the mixture will be correct.

Good Luck, Michael

__________________
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
Old 10-20-2018, 06:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #213 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Itís like you are here with me. I just noticed the slight fuel smell from the exhaust. Thanks Iíll try that.
Honestly Iím loosing my patience.
I checked the timing, cold start valve connection , the fuel pump is running when the engine stalls. When the idle drops below 1000 it wonít stay running.


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-20-2018, 09:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #214 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
I disconnected the temp sensor and Hall sensor. Same condition. Now I notice the green diode flash on the clear relay. No doubt itís running pig rich


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-21-2018, 03:07 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #215 (permalink)
Registered User
 
JK McDonald's Avatar
 
Join Date: Oct 2003
Location: Texas
Posts: 890
Garage
O2 Sensor -

Hey Rufrob - You might try resetting the O2 sensor readings captured in the fuel computer memory. Disconnect the battery - disconnect the O2 sensor - reconnect the battery and start your engine. When the computer sees that the O2 sensor input is missing it will select it's own generic setting. Once the engine is warm - if it now idles and runs OK, suspect the O2 sensor is defective.

There is also a possibility that your "Idle Control Valve" is not adjusting the idle bypass air flow properly. This computer controlled stepper motor type valve is known to fail (no longer open) from contamination. Many times they can be cleaned/flushed out using a spray lubricant.

Good Luck - Michael
__________________
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
Old 10-21-2018, 03:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #216 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
This car is a German spec thus no O2.
While checking the FPR I found the coil to distributor wires had different ends thus not seated properly. So with MAF off it starts and didnít stall. Rough and still rich. Plugged in a spare MAF is much smoother albeit rich. I guess the plugs need cleaning.

Looks like I found the culprit.
Thanks all so much for your guidance and encouragement. Honestly I was about to give up and dump it. I have time limit of 3 more Saturdays before Iím gone on assignment for 4 months.


Sent from my iPad using Tapatalk
__________________
Never give up
Old 10-21-2018, 04:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #217 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Oddly the same MAF worked fine-ish on the bad engine...or was it bad...


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-21-2018, 05:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #218 (permalink)
Registered User
 
JK McDonald's Avatar
 
Join Date: Oct 2003
Location: Texas
Posts: 890
Garage
MAF Sensor -

Hey Rufrob - I've seen the Mass Air flow Sensor cause some strange (Lean-Rich-Poor Idle-No Power-etc....) symptoms. So they can be difficult to troubleshoot without a known good spare. You were right to try and see what happens with the MAF disconnected. One of the MAF troubleshooting steps is to disconnect it to see if it runs better-worse-no change. The LH computer has a learning curve it goes through when the MAF sensor is reconnected and/or replaced.

Since your S4 doesn't use the feedback signal from an O2 sensor - the Air/Fuel ratio is calculated as a default open loop system. You might try to calibrate your MAF using it's potenimeter adjusting screw on the computer near the electric panel. You'll need an exhaust gas analyzer to try and set the potentiometer for a 1% CO at idle.

All the S4 models I've worked on had catalytic converters and O2 sensors so I appoligize that some of my trouble shooting suggestions are "By Guess and By Golly....

Good Luck, Michael
__________________
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
Old 10-22-2018, 03:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #219 (permalink)
Registered User
 
rufrob's Avatar
 
Join Date: Feb 2006
Location: Tokyo
Posts: 687
Garage
Thanks Saint Micheal, patron saint of 928 causes.
Your CE looks different from mine but I know of the CO adjuster there.
What I donít understand is with the bad engine I didnít have the problem and all the components are for the most part the same.
I pulled the plugs this morning, which didnít look too bad. I cleaned and reinstalled them. It no longer stalls but runs only marginally better. Still very rich and or a terrible miss.
I know the wires are weak but again, it ran before.
Now Iím hearing a rattle from the torque tube, which I rebuilt, at low idle.


Sent from my iPhone using Tapatalk
__________________
Never give up
Old 10-22-2018, 04:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #220 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 11:13 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.