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O rest pressure

hello to all. my problem. Rest pressure. First test, 0 pressure within two minutes. Went through both fuel pumps and accum. Improvement, but not there yet. Second, test .8 bar @ ten minutes and going south. My question, how do I remove the cold start injector, can't even get close, what do I need to move. Grateful for all and any help. Thanks in advance.

"87-930 stock

Old 06-29-2011, 10:54 AM
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TTS or CSV

cold start injector is allen bolts... it is behind and below the fuel distributor. Here is a picture. I think you can get to it if you go around and behind the duel dist from the right side after you remove the air filter box and possibly a few other things but it is difficult.

That only works for about 10 seconds on start up... after that if you are still having this issue than it could be the Thermal Time Switch (TTS) located on the chain cover, drivers side and will have a yellow and red wire connected to it. That switch is what tells your CSV to activate or not... and I had a problem with poor running when cold and hot... that definitely helped. Once it is out, it is pretty easy to test with a multi-meter. Call Chris at TurboKraft to see what the multimeter should be reading if good or bad.. I have forgot.

Best of luck,
Bryan

Thermal Time Switch:



Cold Start Valve: It is in the middle of the photo with the greenish/blue plug on top. You are seeing the end of it. The allen bolts are closer to the throttle body and are like a 5 or 6mm.

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Old 06-29-2011, 11:56 AM
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Fuel accumulator?
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Old 06-29-2011, 12:00 PM
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Kirk, he mentioned above that he already went through the accumulator
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Old 06-29-2011, 12:14 PM
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Oops...missed that!
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Old 06-29-2011, 12:32 PM
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First off, welcome to the forum!

Now why are you removing the CS injector?

What is the problem, system pressure bleeding down too quickly? If so the 2 most common culprits are the accumulator and the fuel pump check valve. If both of these are OK you would have to have one hellofa leak to lose that much pressure very quickly.
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Old 06-29-2011, 01:56 PM
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Thanks to all for your replies. I want to remove it ( CSV) to test for pressure loss at rest. CSV (injector) show no ovious signs of malfunction car starts quickly when cold (less than 95F ) car idles steady and smoothly. No, hisses, blurps or hunting. X98boardwell, thanks for the photo. I was trying to find fasteners on the other side of the fuel dist. Photo helped. Thanks
Old 06-29-2011, 02:02 PM
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Brian, Thank you for the welcome. I am not absolutely NEW. Posted two questions about a year ago, different prob, different name. Couldn't use that name because I can't remember the password (had used 4 tries). Not having driveability prob. other than warm start (2 occasions) cranking for 4 to 6 seconds. I have replaced ck valve in front pump, replaced rear pump, accum. was bone dry at bottom hose. Still rest pressure rush. My try is to watch CSV as pressure falls. Now I have been reading this forum over a year. Your Avitar is not new to me. I would take any suggestions you might have, and I'll take the welcome.

Thank U
Old 06-29-2011, 03:12 PM
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could it be check valve?
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Old 06-29-2011, 03:14 PM
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X98Boardwell, I've changed check valve front pump and changed out the rear pump for new. Little improvement. Thanks
Old 06-29-2011, 03:41 PM
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I'll share a secret with you on how I check for CSV malfunction; remove the fuel line where it exits the fuel head and replace the hollow bolt with a regular bolt. Tighten back up and see how she starts/runs with no fuel getting to the injector.

The other thing that can cause pressure loss are leaky injectors. Does your engine diesel on shut down or hard start on occasion? Leaky injectors.
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Old 06-29-2011, 06:38 PM
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Brian I will shop for bolt that thread size, I don't have one lying around. Yes my engine diesels sometimes, IIRC. sounds like 1/2 maybe one revolution. I consoled myself it was the mysterious yellow relay at work. The injectors look like a 2 stage disconnect. First the union nut, then the injector and rejoin for leak test. Is this right? Hard start warm, twice this spring. Brief but unusual. I'll be on it this wk/end. Thanks again. Thanks all.
Old 06-29-2011, 10:19 PM
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The injectors unscrew at the fuel line union, then unscrew from the manifold. Correct.
The CSV is a pain to get at. If you could get the terminal plug off - not easy - it has a spring clip - same as on your WUR, you maybe could put a multi meter across the terminal to see if it has a circuit (on resistance). This will just tell you if it is capable of functioning, but wont tell you if it is leaking. About all you can do is pull it out. It has two allen screws - top and bottom.
Good luck. Ask me how I know.
The fuel pumps ahve non return valves (balls) - pretty sure. Are you sure it is not bleeding back?
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Old 06-29-2011, 11:55 PM
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I think the allen screws may be side by side. May be easiest to pull the fuel /throttle body unit to test - not too hard.
But another thought - shut engine off, pull IC off and open butterfly and peer down with a torch. if it is leaking, there must be fuel dribbling down the throat below the injector orifice.
Worth a look?
Alan
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Old 06-30-2011, 12:08 AM
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I see a couple other things that need to be changed there.
The line coming from the fuel head just to the right of the main fuel supply inlet is not high pressure fuel injection line, it is German vacuum line or old German carburator fuel line and it's fastened to the banjo fitting with a cheap hose clamp.
It will not tolerate the 95-100 psi fuel system pressure that is inside it for long, it will pop or split inside under the fabric and leak gas.. and some of the fabric covering over the rubber line looks to be frayed just below the hose clamp.

That line goes to the lambda frequency valve that bleeds fuel off the lower differential valves (orificed system pressure in the fuel head) and returns it to the fuel tank.

Also there is a loop of similar line laying on top of the throttle linkage going to the throttle body. That line looks a little newer or recently installed and every time you move the gas peddle that linkage rod is rubbing on that hose and will rub through it eventually.
Old 06-30-2011, 06:41 AM
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Alan L

Not sure where the pressure leak is accuring. Peering under the butterfly seems worth a look. I can start there, then to removing the CSV

Thanks



J Fairman

That photo is posted by X98boardwell, I hope he reads your post. I will check my tubing as well.

Thanks
Old 06-30-2011, 09:03 AM
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i just realized that too... oh well.
Old 06-30-2011, 09:30 AM
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Fairman, this was when I first bought my car and is was partially disassembled... not the final product and now it is sold. Thanks for the keen eye.
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Old 06-30-2011, 04:53 PM
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Quote:
Originally Posted by RarlyL8 View Post
I'll share a secret with you on how I check for CSV malfunction; remove the fuel line where it exits the fuel head and replace the hollow bolt with a regular bolt. Tighten back up and see how she starts/runs with no fuel getting to the injector.

.
That is a fantastic tip, I have always removed the valve to verify leakage, but it is ALWAYS a pain in the arse. I think it may be a little easier on a 930 than a reg cis car, but no fun either way.
I learn something new here every day!

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Old 06-30-2011, 07:21 PM
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