"Two stroking"

[jgbff7]

I sorted out the timing on the red one and took her for a run. She ran beautifully and we stopped for a cup of tea. When I restarted her she was very lumpy, what I knew as two stroking years ago. Certainly not firing on all cylinders. And the oil pressure dropped alarmingly.

I nursed her home.

I disliked all the go-faster kit, dumpvalve etc and so I took it all off and returned her to stock, including putting her original air filter back on.

I also changed the fuel filter and replaced the plugs. I found the neg terminal on the battery was done up tight but it was not gripping the battery lug, so I fettled that.

Took her out today and she was fabulous. No hissing or burping from the dump valve, boost coming in at higher revs in 2nd and third, absolutely spot on.

Parked her at home for an hour and went to take her out again. Back to her old trick of two stroking, not firing on all cylinders and oil pressure down.

Any ideas please?

I must say that whilst she is low miles, 58000, she has not been looked after well. Where trim has been removed it has never been refitted with screws and fir tree fittings. And today I took the driver's seat out to make the seat belt more accessible and found the spacers were not fitted correctly nor the shouldered washers .

Rant over

John

[esprit888]

Sounds a lot like a coil breaking down once hot (as one coil services two cylinders) I have a spare OEM set in the garage, but I’m a long long way away!

[Saltire]

That sounds very much like a coil to me. I don’t know what you’ve done to the car since you became its custodian, but if it’s not been looked after that well, I’d be attending to all the usual service issues, including plugs, coil packs and, importantly, a change of cambelt, tensioner and water pump unless you know for sure what’s been done. Things deteriorate over time as well as mileage, and it would be as well to be sure. Rebuilding an engine with a snapped cambelt is not fun

[jgbff7]

May I set out how these issues were resolved?

Changed coils. No improvement.
Changed fuel filter. No improvement.
Changed plugs. No improvement.
Changed temp sensor to ECU. No improvement.
Changed injectors. Huge improvement but still not right.

At this point I needed help so I took the car to Cos at Sportivo. He retimed the ignition, found the fuel pressure regulator had a broken spring (overfueling), and freed off the wastegate (overboost.)

The car runs so well now. Cos was surprised at how well it runs. It still farts a bit but that is probably an air leak in the sports exhaust.

A steep learning curve, but always good fun.

John