AO Gold Member
Join Date: Sep 2011
Location: United Kingdom
County: Greater Manchester
None running Ph 1 1997 2.0 TS 105k miles
Our 916 2.0 TS had a loss of power on the motorway after a long weekend around Wales.
We have done about 700 miles since the head gasket and cambelt was changed. Most of that this weekend (550). That work was done June last year approx. Two weeks ago I had the oil changed and replaced and the brake fluid (no relevance for the latter).
On Friday before the weekend I changed the plugs and air filter. The car seemed as good as it ever was.
So driving at around 4k rpm and the power drops. Not electrical, just as if the ignition was turned off. My first thoughts were the belt. I coast onto the hard shoulder and by this time the battery and oil pressure light are on which you'd expect with the engine not running.
I turned the starter and it was as if the starter motor was not engaging the flywheel. I assumed for certain the belt had gone. I pushed my finger under the belt cover but the belt was there and under what I considered good tension. At this point I called the RAC. 20 minutes later he arrives. I explain to him it's as if the motor is not engaging the flywheel etc.. Whilst I turn the key he checked under the bonnet. Auxiliary belt turning, hard to tell if the cam belt was at that point. His description was loss of compression which actually seems to be the case. The starter spins the engine too quickly IMHO. I can't be too sure because this car has always started on the first turn.
We get towed home. Yesterday evening I checked the plugs had not come loose, far fetched I know but an idea. They weren't. I had someone turn the engine over and the cam belt is turning as are the two cam sprockets. Is the balance shaft at the top? There is something turning there I'm sure.
I know little about injection systems as my engine building hours were all with carburetors. There seems to be two pipes on the injection 'distribution bar', one with an arrow in and the other an arrow out. The arrow in clip seems a bit loose as I can move the pipe up and down the metal nozzle connector which I can't do on the out arrow pipe. If I hold it in a certain way the pressure built up (starter off) causes fuel to squirt out. So I can assume there is fuel coming through? I am not sure the connection is tight enough. I will clip it properly when I am next working on the car.
I have checked on cylinder 1 that there is a spark, not checked any others. So I seem to be getting a spark and reasonably sure there is fuel though is that connection causing a starvation of fuel?
My next move is to remove the cam cover and check there is no large valve gap as I've read that can be a sign of the valves meeting and greeting the pistons. I assume they are stuck/bent open and therefore do not return. I have no experience of a belt failure or belt slip.
I will also get hold of a compression tester and test each cylinder. As the belt is most certainly in place and the tension feels good if it is the belts then they have slipped a tooth or so. There is no banging knocking now or when the engine lost power.
The starter does seem to turn the engine over too quickly. Any ideas? Crank sensor? I think the phase one pre-dates OBDII. I'm sure there is an ODB connection (I) on the car? Is that the case?
Eventually it will most likely go into a garage for repairs. I do not have the time or space to repair it at home. I'm just trying to get an idea of the fault.
I'll keep the thread updated as I do or learn more. I'll also post this thread in the Engines section of the forum.
Priorities I find, are usually someone else's.
Statements above are all my own opinion and not fact.