CIS mixture tool
 

What is the metric size of this CIS allen wrench used to adjust the fuel mixture?

How long of a straight shaft will i need?

3mm I got this one at local car parts store it has a ball type tip which is ideal for getting into the CIS mix screw, it is about 4" long.http://forums.pelicanparts.com/uploa...1224757473.jpg

Davy
That photo just cleared up the hundreds of questions as to where do I place the tool.

Great job.

the long one out of a craftsman set works great.

so how do you get that one pictured into the hole with the engine in the car?

CIS length
 

How far down in that hole does it go?

Clockwise or CCW to make it rich?

right to richen (CW). always turn it from lean to rich for final adjustment. if you do not have a way to check CO, here is how i set mine. turn it CW until it surges at idle then back off a tad. blip the throttle and if the RPM's dip down then come back up to idle, it is too rich. turn it CCW about half a turn then back CW a little less than how far you turned it CCW. blip the throttle again. repeat until it no longer dips down when the RPM's come back down. mine is set so it has just a hint of wanting to dip down when i let off the gas. drive it and check again. i later had mine checked and it was dead on 3%.

lean or rich
 

Thank you for the advice. I can always have it done professionaly later . Just need to get it running.

If i blip the throttle now it just stumbles and backfires

i was sorting out a few little issues too. so i set mine myself and then had it checked after things were right. now i have the confidence to mess with it if i need to and i know i can get it right. now is the time to play around with it and get a feel for setting yourself.

make sure your timing is corrrect and the advance is working along with the vacuum enrichment to the WUR.

I bought a set of allens from Harbor Fright and cut it down some to fit between the sound shield. The end for the rachet is a nice handle to turn the allen.

81 White 911,

If it backfires through the intake it is too lean; through the exhaust usually means too rich.

As T77911S mentioned, this can be due simply to the setting, or to other factors, like vac leaks or a poorly performing WUR.

more backfire
 

Its definately not the wur that has been cleaned and tested on the car.

Could be vacuum leaks but im running out of possiblities.

I have a Hobbo Freight near here , time to make the trip.

Im curious about the frequency valve not working

You would know if the FV is not working. The description from other board members that got me to understand it was "feels like you are dragging an anchor" and it certainly is true! It runs, but when you step on the gas it doesn't run much faster.

You can feel the FV 'buzzing' when at idle if it is working.

to check the FV function, remove the interior light fuse when the engine is warm and at idle and see if the idle drops off and gets chuggy.

Get buzzed on the FV
 

Ok, i got up early 4am and finished work early. Time to find this FV and get buzzed. Where is this thing?

If its not working for some reason. Would it cause the backfire and rough idle?

see my last post.

if your WUR has the vacuum enrichment, which i think it does, it could be that it is not working properly. it acts like an accelerator pump on a carb.
also check timing and make sure the advance is working.

do you have a pop off valve?

what led up to the car running bad? all of a sudden, recent work?

NO buzz
 

i have a pop off valve, and it pops, so lean condition.

removed the relay under the passenger seat, no change.

reached back to the FV no Buzz.

Replaced the WUR vacuum line, maybe alittle better but still backfires.

replaced the blue vacuum line to the distributor, again maybe alittle better but still backfires.

Im am almost positive the cold start valve does not work. but i let it warm up for at least 20 minutes.

If the engine is running and you remove the Lambda relay under the passenger seat. The engine should starting running VERY rough, mine just about died.
If you remove it and NO change at all? The I would guess the lambda stuff is not working, so the relay could be bad, does the dome light work? If not check that fuse.

Jay

Can you use that one with everything in it's normal place?

read the last few of posts again. often as simple as a blown interior light fuse. the relay is the next likely suspect. when the FV isn't working, you go very lean. seems like that's what you have.

no.

Thanks... I thought it looked a little fat on top.

dome light
 

Hey the clock is running , does that count? As for the dome lights, maybe their just burned out.

Theres two small boxes down by the big box under the passenger seat.

One is 1" cube and is the relay i think. Can i check the voltage their?

The other is the size of a pack of cigarettes.

Can you adjust the mixture with that big rubber intake header in place>?

1" cube. if the interior light fuse is good you will have voltage in but maybe not out. check the 87 and 87b for voltage. if you don't get voltage there, you can make a jumper lead and simply give voltage to the 87 and 87b terminals in the relay plug. for test purposes.

WUR with vacuum.......
 

T77,

I believe that CIS (SC) engines with lambda sensor have WUR with no vacuum enrichment line. WUR's (-072 & -090) do not have vacuum enrichment which are OEM for these engines unless replaced by another type WUR.

Could someone say otherwise? Thanks.

Tony

A bit of jiggery pokery and it goes just need to wiggle it in between the boot and the injector lines but it does go I have done it.

Shane yes it is a bit tricky getting it in the hole but it is possible

Here it is again pictured with the CIS back in the carhttp://forums.pelicanparts.com/uploa...1224834815.jpg

Todays plan
 

Relay is available about an hour south, so Im making the trip to buy it and hopefully fix the FV. And if that doesnt work ill start tracing the voltage.

The wur has a vacuum line on my 81 sc. The wur was removed, cleaned, i check the resistance 9.9 ohms, did the fuel pressure tests, all good, and replaced the wur vacuum line which i think had minor leaks, but didnt seem to make a big difference.

If they can find the enrichment tool I'll try that too.

Tony, 81 White and T77911S,

The WURs for 80 and 81-83 don't have the vac enrichment. There is an atmosphere line @ the top.

Someone could still have one w/ vac as I do on my car, but you wouldn't use the lambda control then.