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Optic sensor

matuva

matuva

Tropical 6.5er
Messages
1,996
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Location
New Caledonia. An island in south west pacific, cl
Just to let you know, if that happens to one of you.

Last friday evening, a guy came home asking if I can help. His K1500 just quit few steps from my home.
I tried to help him fixing it, and thought it was PMD first, though she just quit and never restart.
As it was coming late, we pushed the truck and parked her at home.
Saturday we were too busy.
We started again sunday, trying to guess what was going wrong. My laptop is out for the moment so I wasn't able to read any code...

New PMD : cranking and no start
found ECM-B fuse was blown. replaced the fuse : no start
Fuel shut off solenoid look weak. Put a good one : no start
we crank an injector and see that it was receiving a very little fuel only, though the LP was pushing strong.

Then, I realised this is late 1995 and thought about the RF filter at the optic sensor.
I disconnected it, and bingo, she fired right away, limp mode.
reconnect the plug, and she never restart.

In fact the optic sensor was shot!

Luckely for him, I got a spare one. we opened the IP, changed the optic sensor, reconnect the all thing and she start at first key on and purred like a kitten.

Just to let you know, in case one of you meet such kind of stall ;)
 
JiFaire said:
Good work, Al... if mine ever breaks, I hope it's in front of your house :D
Click to expand...

Same here... though Austrialia. Jim don't you think its a bit "far" for your truck to conviently break down in front of Matuva's house?

Unless your truck can do this:
floatingtruck.jpg
 
matuva said:
Just to let you know, if that happens to one of you.

Last friday evening, a guy came home asking if I can help. His K1500 just quit few steps from my home.
I tried to help him fixing it, and thought it was PMD first, though she just quit and never restart.
As it was coming late, we pushed the truck and parked her at home.
Saturday we were too busy.
We started again sunday, trying to guess what was going wrong. My laptop is out for the moment so I wasn't able to read any code...

New PMD : cranking and no start
found ECM-B fuse was blown. replaced the fuse : no start
Fuel shut off solenoid look weak. Put a good one : no start
we crank an injector and see that it was receiving a very little fuel only, though the LP was pushing strong.

Then, I realised this is late 1995 and thought about the RF filter at the optic sensor.
I disconnected it, and bingo, she fired right away, limp mode.
reconnect the plug, and she never restart.

In fact the optic sensor was shot!

Luckely for him, I got a spare one. we opened the IP, changed the optic sensor, reconnect the all thing and she start at first key on and purred like a kitten.

Just to let you know, in case one of you meet such kind of stall ;)
Click to expand...

I think there are quite a few IP's replaced when actually the optic sensor is the problem. JMHO.
 
It would be nice to have a thread that someone disassembled a ds4 and labeled and explained all the parts and functions.
 
How on earth are there so many 6.5's on that little island you live on? It never seases to amaze me Mutava... Good job on the fix, as always!

If you weren't so busy fixing other peeps 6.5, you could toss your Walbro back in!
 
I was looking where he marked it. I couldn't see it. I have an old IP that I'll have to practice w/. I have already started using it to get ready for the FTB mod.
 
Veg_Out said:
Here is one I found...

http://www.mamut.net/royh/newsdet9.htm
Click to expand...


Good find Pat, but Al you still aren't off the hook, your pennance is to take some good pics of something we don't have yet. :D

I've never been a fan of optic bumps, as if moved too far you mess up the ability of the timer stepper motor to operate correctly, the "window" of operability can be mechanically offset too wide either direction advance/retard PCM has no indication of this offset, and TSM electrically goes to where a +/- 2.02 electrically if you were there with factory optic position would code you.

MPG & driveability can suffer if optic is mechanically bumped too wide, it requires some finesse to set "just right" IMO far easier to let the PCM do it's thing with optic where it is supposed to be set at.

I've been involved with un-bumping more rigs to get rig driveability restored that others have bumped than seeing where bumping them has given performance gains without hurting driveability.

Most of the bumped rigs were done before quality reflashes were available, or folks knew how to do TDCO correctly, IMO good reflash and TDCO advance to -1.5 to -1.94 is way to go.
 
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