hailwood

car is hard to start, once started will not idle until it is warm. car coughs and sputters and billows smoke (whiteish and dark brown/black)

once warm it seems to run fine but will sometimes cut out under hard acceleration

are these symptoms common with a WUR failure.

I changed the plugs and fuel filter last night but it did not make much of a difference. the car did start a little easier, but not easily.

125shifter

Sounds like a WUR, but without checking the cold and warm pressures with CIS gauges, it's hard to tell for sure. If you buy a stock WUR, be sure and buy a new one not rebuild. Somebody's making an adjustable one if you're into tinkering.

hailwood

i looked on pelican and it was around $800. is there a better deal out there someplace?

sand_man

What year is your car? Also, a faulty cold start valve could cause probelms. You really need the CIS pressure gauges to determine the WUR health. Here's a thread that I started about my issues with the WUR. I've also documented where I got my gauge set. So far, I have used the gauges on numerous occaisions...so it was money well spent.
https://rennlist.com/forums/911-turbo-930-forum/297546-a-crazy-little-thing-called-a-wur-warm-up-regulator.html

sand_man

Don't buy a new WUR...there are places that can offer a rebuild. The Brian Leaske (FLYN930) WUR would be the best option and it would be completely adjustable!

nathanUK '81 930 G50

Put a meter across the electrical terminals, if you get a resistance then your WUR can be rebuilt. If there is no resistance then it is junk, a new or secondhand one will have to be replace it.

hailwood

sandman

the car is a 1986.

i also have one other question. the car has been desmogged by a previous owner and it apperars that the o2 sensor is unplugged. this is a wire that leaves the left rear of the car and goes directly to the exhaust. should this be unplugged if the car has been desmogged?

thanks,

Leslie

sand_man

It is pretty normal to find the O2 sensor disconnected. I believe it's part of the original Lambda system that helped maintane a constant CO level. Most disconnect this and just set the CO to a certain level and call it a day. A real pro like Stephen from Imagine Auto could explain much better than me.

125shifter

If you buy a rebuild and have the same problem, don't assume it's not still the WUR.

hailwood

can someone give me a source for purchasing a WUR at a reasonable price. i would prefer to get a new one and get mine rebuilt as a spare.

sand_man

http://specialtauto.com/porsche-parts/index.html
but I'd send a PM to Flyn930 (Brian Leask) first.

sand_man

I still you think you ought to do some more digging. There are lot's of things that go wrong with CIS. It could be the WUR - it might be something else...I'd have it checked before sinking some bucks into it.

hailwood

hey just a FYI. i did some searching on the bosch site and found the part number for the WUR. i also found out the napa, vip and robbins(local) auto sell them. as well as a lot of other fuel injection parts for our cars. napas price is.......a heck of a deal. they also sell the cold start valve, injectors, oil filters, rotors, pads and a lot more.

Product Name NAPA Part # Non NAPA Part# Price Select
Warm-Up Regulator - Remfd CRB
217823 0438140153 $244.00
Core $27.75

here are some more bosch numbers i thought you might be interested in. napa sell all of them.

Part Number Description Where To Buy
0 280 140 204 Auxiliary Air Valve Locate Retailer
0 438 120 205 Air Flow Sensor Locate Retailer
0 280 170 400 Cold Start Valve Locate Retailer
0 438 170 031 Fuel Accumulator Locate Retailer
0 438 100 145 Fuel Distributor - New Locate Retailer
0 986 438 145 Fuel Distributor - Exchange Locate Retailer
0 280 160 302 Vacuum Limiter Locate Retailer
0 437 502 017 Injection Valve Locate Retailer
0 280 161 019 Pressure Damper Locate Retailer
0 280 120 107 Throttle Switch Locate Retailer
0 438 140 153 Warm-Up Regulator - New Locate Retailer

sand_man

PM sent.