Startup procedure for a CIS 3.0L
 

Hi all. Just hoping someone can post a video and or their step by step startup procedure for a CIS 3.0L or similar. Cold start but warm weather. I want to see how it compares to our C3 to see if ours is running ok or the WUR needs work.
I will try to post a video of the C3 starting up tomorrow.

Cheers, W.

I just turn the key on my 78... It always starts.

Me too!

Are you referencing a start up from a fresh rebuild or?

C3?

you should not need to give it any gas, just turn the key.

WUR should be checked with gauges. starting issues could be many things.
WUR
air leaks
ignition
mixture setting
cold start system
(hot starting)
fuel accumulator
check valve

Thanks,
I will try to post a video but in the mean time this is my procedure.
1. Select Neutral
2. Pull up the little black lever about 4/5ths of the way up.
3. Turn the key.
-Engine turns over and splutters to life after about 5-10 seconds.
-Oil pressure needle madly and dramatically rises and falls for a good 60 seconds.
-Revs rise and fall rather than staying constant
-revs eventually drop down.

4. Reduce the amount of the little black lever.
5. reduce little black lever to nothing after about 10 minutes of idle/driving.


N.B. This is from a cold start on a hot day when the car hasn't been started for a few days.
Engine has not been tuned or re-built for a long time.


Cheers.

C3= Carrera 3.0L 1976 CIS

am i the only one that did not get that???

Stick the car in neutral, push in the clutch pedal and turn the key. Leave the hand throttle (black lever) off, all the way down. Do not press the throttle pedal.

Once it is started, if you want to raise the idle speed, do so with the throttle pedal and then pull the black hand throttle lever up until it holds the engine speed where you want it and you can release the throttle pedal.

JR

Thanks. Any reason for not touching the black lever until after engine has started?

The WUR is enrichening the fuel during cold start and if adjusted correctly the car should run at a slightly high idle until the WUR is heated and starts to lean out. The black lever raises the idle speed for really cold days.

The earliest CIS systems used in 1973 had a microswitch that was activated when the hand throttle was pulled all the way up to start. It was part of the cold start system.

The Carrera 3.0 doesn't have this, so the lever only serves to open the throttle, which leans out the starting fuel mixture. Not what you want...

JR

Fair enough.

I just made a short video of it starting up.

Not applying the hand throttle (lever) is a no go. It will not stay running without it, or the right foot applied.

Thanks, that all makes sense & that seems to be how it plays out.
The only thing is it is definitely not a cold day. 92deg in the garage.

The car should definitely start right up without the throttle lever at that temperature!
I'm thinking you should test your fuel pressures and go from there. Do you have a Bosch CIS gauge kit for testing? I don't know the specs for your car, but others will chime in.

Yeah as mentioned, simply jump in, turn the key and she fires right up. Comes clean after maybe 5 seconds or so. This happens always from about 2c to 45c ambient over here in Oz.

Sorry, haven't been able to upload video yet. It took 2hrs to upload into YT even though it only runs for 2 minutes. Won't be able to do it now for a few days.
From what everyone is Saying though it sounds like there is some kind of issue, which is what i had thought.

Did it start quicker without the hand throttle? Maybe 1 to 2 seconds of cranking until it fired? That would suggest that your cold start valve is working properly.

Fuel pressures are important but I'd probably start by checking the operation of the auxiliary air valve and auxiliary air regulator.

JR

Yes it did start quicker without the throttle.

Okay, so check the operation of the auxiliary air valve first, then.

JR

well, if I give u my secret, U'll at least consider viewing the new, but not officially released, 'Carrera 3.0 registry'> Check out PCA 911 Carrera 3.0 US Registry
Now, first put a key in the slot, since I know Ur's has a manual choke or idle adjustment lever,
pull that black handle, right next to the pink/orange heat control lever, up a tick. Not too much so U'r 'pop-off valve' doesn't have to react, mine fires off on the 1st or 2nd second!
Enjoy>>>

Video.... Finally
 

Hope the link works.

CIS cold start - YouTube

Cranks way too slowly. Battery bad?

Needs a valve adjustment.

When's the last time it had plugs, points, filters?

When's the last time the CO was set?

Running very poorly, for sure...

JR

Agreed.
The battery is old(ish) I think the main problem is that it sits around not getting used and runs flat from time to time.
As for plugs, points, filters & CO I really can't say. definitely not for a while.
The car only comes out for a 10mile or so drive once a week so very little servicing has occurred in recent years.

Lots to do to get it back up and running properly.

N.B. When the engine is warm, after say 10 minutes of driving everything seems fine. Plenty of power and smooth idle.
I think a dyno would tell a different story though. I doubt all 200hp is available atm.


W.

Start with a full service. Do a valve adjustment, service the distributor, change the oil, change all the filters. Check all of the main CIS components to make sure that they are the correct ones. Check the fuel pressures, check for vacuum leaks, set the CO.

Obviously, fix any problems you find along the way. If the gas isn't fresh, drain it and add fresh gas. Charge the battery, or replace it, and clean all the cables, including the grounds.

JR

Agree with everything javadog said, plus drive it more! :)

I think it is odd that your speedometer needle jumps slightly when you turn the ignition key.
It might not be related to your poor running but it looks like there is some kind of spike there.

However javadog has given you plenty to get on with already.

Please keep us updated as I will follow this one with interest as I have a idle issue with my C3 though mine idles high and I have an occasional hot start issue that I work around by using a little gas pedal when starting.

The above comment about checking that all of your CIS components are present and correct is a valid one as my car seems to have parts from other models and my throttle handle is not connected at all.
Cheers
Bill

Thanks everyone. Will get to work on it. One other thing to mention but not sure if it makes a difference is that the starter motor is out if a Toyota Dyna light truck. The local porsche shop couldn't source a OEM one at the time but said the Toyota one would work. It does and has been in there for about 10 years.

Interesting, was it a direct fit?

More or less a direct fit.