Wur

[long board]

Is installing the WUR a simple R&R, or does it require some expertise in adjusting it? Can you bypass the WUR to get the engine started? I was hoping on avoiding a tow truck.

[dougcl]

Installing the WUR is simple R&R. No adjustment is necessary.

[fireant911]

dougcl,
Am I understanding that when installing a new Warm Up Regulator it is not required to be adjusted? I purchased a new Bosch unit for my car at what I found to be a very good price and I was under the assumption the the pressure would have to be adjusted once I finally install the unit.

[long board]

What's in that thing? Can it be rebuilt?

[sushinav]

Bruce A, talks about making a mod to them to make them adjustable, but a stock, new one should have no adjustments.

They can not really be rebuilt, but they can be disassembled and cleaned carefully. I did this and it cured my problem, but it may not fix yours.

[long board]

So I could remove mine, clean it, and put it back on and all will be right?

[Paulporsche]

Not necessarilly. The best way to see if the WUR is working correctly is to check your control pressures. Your WUR could be out of adjustment, and require the plug on the top to be knocked in further to increase your mixture richness. Or your electrical connection could be bad. Or the bimetal strip inside could have too much resistance.

I am not saying you have these problems. I am just pointing out that, while the unit is not ridiculously complex, more than a simple cleaning would be required to fix the usual problems.

If you search you will see a lot of valuable info on this.

[long board]

Ah ha! Another reason a philosophy major doesn't help me with my chosen hobby. I do conclude that my muscle cars are a whole lot easier!

[RarlyL8]

WURs can be rebuilt.
Getting Bosch to sell you a kit is the hard part.
A stock unit is not adjustable. They can be made to be adjustable. If you purchase a new or rebuilt unit it should not need any adjustment. Your fuel head mixture may need adjusting if it was fiddled with to compensate for the previous WUR that was faulty.
You cannot bypass the WUR and have the engine run. System pressure from your fuel pump(s) is ~6 bar. Pressure regulated by the WUR is from ~1.5 to ~3.5 bar. It can probably be made to run by gross adjustment of the mixture but that would not be a good thing.
If you have purchased a new or rebuilt unit just install it and see how it goes. The stock WUR is simply bolted to the engine. There are 2 fuel lines and a couple of vacuum lines to R&R. That's it. If in doubt purchase a CIS pressure tester. We can talk you through it.

[anp abrams]

took mine apart,cleaned ,works good now

[Paulporsche]

What was dirty/ what did you clean?

[sushinav]

I agree 100% with Paulporsche. You do need to properly diagnose your CIS system via the pressures before you disassemble or try anything. In my case, after diagnosing, I was going to buy a new one and figured I would take my old one apart to understand how it worked. It's been awhile, but I remember cleaning a small plate that had some fuel accumulation and the rest of the internals. I then firgured I'd see if that worked before I bought another. It worked for me, so I was lucky. I did not mean to give the impression that a cleaning is a sure fix, nor that these should be disassembled prior to proper diagnoses.

That said, once you understand how to use the dual pressure guages and how to diagnose, I found the CIS system fairly easy to deal with and reliable. Not too scary.

[anp abrams]

found spring and cap gunked up with what looked like anti-corrosive grease,also electric connector both inside and outside the valve body.simple to take apart,simple back together.Worth a shot and it seems to work and cheaper than $400 big ones.

[Paulporsche]

Anp,
I have seen that grease in the cup that holds the pin. I guessed that was there to keep the pin upright during reassembly. Did you remove all that grease? Was it easy to reassemble afterwards?

[anp abrams]

no problems at all putting it back together,you can eyeball the guts as you reassemble with a slight twist of the head.so far so good

[Paulporsche]

Anp,
So you removed all the grease?

[anp abrams]

yes,sprayed the whole thing down with safety solvent,had second thoughts but cleaned anyhow.wrong thing to do?

[Paulporsche]

I don't know. Is some grease supposed to be in there to keep the pin lubed or is the grease really some sort of sludge that has built up? Gas isn't supposed to pass through that area, so I am thinking a small amount of grease should be there for lube, or as I mentioned before, to hold the pin upright for reassembly. If anyone else has taken theirs apart, did they find this grease?

[echrisconnor]

I've been thinking about doing this rebuild myself and had another post going yesterday looking for advice of this sort.

If you open up the WUR, do you need any re-sealing kits, or does it jsut bolt back together?

[sushinav]

I had the grease and used it to hold the pin too. Tried it without the grease and couldn't do it.