Lancia Motor Club

Could really do with some advice please.
Just at the end of a 4 year restoration on my 66 fulvia coupe s1 1200. Everything is done apart from a problem with kangarooing going forward. Its fine at rest or in reverse. Had new distributor  coil and refurbed  carbs together with an electrIc fuel pump.It doesn't seem to be a fuel problem as we have bypassed the fuel tank.
We're thinking it maybe a dodgy wire as the engine tilts differently on forward and reverse . Any ideas ?
Dave

Did you replaced all the engine and gearbox mountings? sounds a bit like drive line shunt which was fairly common in that era of cars,
Something worth considering, even if it isn't your problem.
Brian
8227  8)

Kangarooing would normally be caused by some fuel/air issue e.g. a semi blocked fuel filter where at light loads (idle / reverse) things seem okay but at heavier loads not enough fuel can get through. Definitely worth double checking the fuelling and any compromised gaskets.

How severe is the kangarooing? It might be worth me recounting a problem I had many years ago after a service at a well known Lancia specialist. Leaving their premises and everything was fine but not long after there was this bad kangarooing which seemed to rectify itself before happening again. It turned out that one of the threads to a screw for the points had been damaged slightly. Because the points were then not seated properly it was causing some, um, interesting timing issues and the kangarooing.

Original size slow running jets are too small for modern fuels so that may be part of the problem???  Easy enough to increase the size experimentally.

Fulvia815 asked me, via Facebook, to thank those who replied to his question. He has a problem accessing the LMC website due to a problem with the IPhone that he uses for access. I am waiting to hear whether the problem he had has been solved.

I saw his Facebook post....but is his problem resolved I wonder?
My only experience of such an issue was caused by the rear subframe not being attached to the body due to corrosion!
Chris

Thanks guys. I'm back on the forum. No the problems are not yet sorted. My mechanic is coming tomorrow and I'll show him the messages. Any other ideas ?

Should have said '..... rear subframe MOUNTS not being attached......'

Just taken it out for a short drive. kangarood up to 40 mph and eased off the throttle it runs very sweet. If I put the pedal down it kangaroos again.

Thinking of taking it to tank Barrett next week. Apparantly he is very good.

any odd noises while "kangarooing"?

Does the throttle feel sticky with or without the engine running?

Does this happen in a particular rev range? Fueling problem? Jets?

I agree with Richard.

Many thanks for all the replies. The throttle is not sticky.  No strange noises. Had the carbs rebuilt completely. It is at all rev ranges only when going forward. Sounds great at rest or in reverse. Have bypassed the fuel filter and there is no change.

Yes, but try increasing the "slow" running jets - there are many posts on this already.  Mine are now 60 with great improvement.

Thanks Dave. Have a local lmc member who is popping over this week who refurbished the carbs for me. I shall mention this to him. We had exactly the same problem before they were refurbished but definitely worth consideration because we are still using the same size jets.

Ok Dave.  Thanks very much. When it's finally sorted I'll put a post up about the fix.

I had the same issue on my Berlina.  I tried all manner of tuning issues, engine mounts etc and a new throttle cable and then noticed a slight tendency for the engine to idle high at traffic lights.  Problem was therefore diagnosed as a sticky throttle pedal bush - not apparent when just pushing the pedal by hand.  I replaced the bush and problem solved. Now very smooth.

Thanks David. I'm away for a few months but will check that when we return.  So many helpful comments.
What I've just remembered is that there was a brake servo fitted which shouldn't have been to my my 1.2. The brakes were seizing so we removed it.  The kangarooing started then.
Could that make sense?

Air leak via the servo pipe intake on the manifold? Andrea

Yes Andrea that's what we thought it might be. When it is finally sorted I will post the fix.

I had the same issue with my Berlina.  Finally traced to a worn throttle pedal bush! Seemed Ok when operated by hand but it's deceptive. Worth changing the cable too. 

Thanks David. But it revs fine at rest and reverse. Did your berlina do that ?

Hi. Sorry to bring this up again. I have just read a thread about the 123 distributer which I have fitted. It says you must have an electric tachograph cable rather than my manual one. Which actually stopped working when we fitted the new distributer. Is this a possibility for the severe  kangarooing just when going forward ?

Hi. Sorry to bring this up again. I have just read a thread about the 123 distributer which I have fitted. It says you must have an electric tachograph cable rather than my manual one. Which actually stopped working when we fitted the new distributer. Is this a possibility for the severe  kangarooing just when going forward ?

I thought the Rev counters were electronic anyway, driven from the negative side of the coil. If your Kangarooing happens under load when accelerating it`s usually on the high tension side of the ignition eg. plug leads or coil king lead.

Deleting a cable drive to the rev counter wouldn't affect the motor but I think I might be tempted to reinstate the original distributor to see if it improves your symptoms?

Guy

Thanks Guy. I would do that but the new distributer was installed to stop the kangarooing together with quite a few other parts. None of which have changed a thing. Not sure about that Jay. Way over my head. I just read that a 123 distributer needs electronic rather than manual cable. Away till end of march. Just sitting , thinking and worrying. Lots of ideas on this post to address when I get back to uk. Very frustrating as the car looks glorious but doesn't move forward.

Just a quick update. We have now had new gearbox and engine mounts fitted. New throttle cable and new rubber wheels under the accelerator pedal. A full refurb on the carbs have been carried out. Still kangaroos. Shall be looking at the slow running jets in a couple of weeks. We have also made sure there is no air leak into the manifold where an after market servo had been fitted. Hoping it's either going to be a problem with the new points or slow running jets. Shall report back.

It's fixed !!! Had it trailered to omicron. They went through everything and turned out to be a mixture of fuel pump that wasn't powerful enough and a brand new faulty distributor.  The bill made my eyes water a little but to be honest I wish I'd have done it 2 years ago. Thanks for all your responses.