Following on from my previous post about this new problem with my Zed.

My Zed engine stops after driving for about a mile, it restarts and runs for about another mile and then does it again.

I had thought that the old Meta alarm/immobiliser was at fault (it had been giving problems),so  I bought and installed(eventually) a plug & play replacement (HPA EVO) alarm/immobiliser.....

No change, the engine stops after about a mile of driving, no warning, no stuttering, just engine stop and all lights on dash.

Shift into Park position (auto) and it starts right away, no hesitation - a mile down the road it does it again.

ECU Talk throws up error 34, knock sensor, that's all. If it was the PTU, surely the EML or a code would flag up?

The car will idle away for as long as you want, no problems - but when you start driving, then the problem arises...

 As it only happens when driving, would a faulty inhibitor switch cause the problem?

Any help or thoughts are much appreciated.

Andy

 

I had exactly the same, my car was running a series 1 PTU, swapped to another series 1 PTU known to be good and the problem resolved, ultimatley moved to series 2 PTU and relocated the postion to help with cooling. 

Series 1 PTU's are known to display failure with heat and load.

My advice , borrow a known good one and try your car again. should be plenty of peaople on here willing to help you out, it may also help if you identify your location.

If yours is a series 2 PTU and you are near enough to me, you are welcome to try mine to see if it resolves your issue.

Cheers 

Sayers

Edited May 2, 20214 yr by sayers

Thanks Sayers, I have a series 2 PTU fitted and relocated to under the nose cone and also have a spare series 1 PTU.

I'll try and swap them over, see if that helps but surely the EML would flag up a faulty PTU?

Probably not near you, I'm in Dunfermline ?

32 minutes ago, CrashCourse said:

Thanks Sayers, I have a series 2 PTU fitted and relocated to under the nose cone and also have a spare series 1 PTU.

I'll try and swap them over, see if that helps but surely the EML would flag up a faulty PTU?

Probably not near you, I'm in Dunfermline ?

You’re over estimating the capabilities of the ECU to provide that level of accuracy with diagnostic codes..... you gotta remember it’s pre OBD and 1989 computing technology. It’s extremely common for such things like PTU, CAS, MAF, CTS all to fail without the ecu throwing a singls code

I had a similar problem some years back with a MX5 which turned out to be a faulty ptu.

Yeah, I have a replacement PTU ordered, here's hoping that that sorts it out.

Okay, replacement PTU fitted and I still have the same problem......

The car will still idle away for any given length of time, but drive it for a mile and the engine stops and the dash lights come on!

It restarts instantly, then not much further down the road, it stops again.

I've replaced the old Meta alarm control unit (plug and play kit using the existing wiring) and the PTU.

It's surely electrical, would any wayward relays cause this?

Again, ideas and suggestions welcome.

Andy

 

 

 

Forgot to say, the engine has recently been overhauled.