Another limp mode problem

[Pedro]

Running on 3 cylinders would cause limp mode as unburnt fuel would enter the exhaust & be picked by on the Upstream Lambda sensor which would alert the ECU the combustion cycle is out of sync ?
You need all four cylinders firing for the ECU to correctly calculate the exact Fuel /Air ratio for combustion if one plug is misfiring or dead then its into limp mode to try & stop serious damage happening as in it disables the Turbo etc

 

[MXV]

Running on 3 cylinders would cause limp mode as unburnt fuel would enter the exhaust & be picked by on the Upstream Lambda sensor which would alert the ECU the combustion cycle is out of sync ?
You need all four cylinders firing for the ECU to correctly calculate the exact Fuel /Air ratio for combustion if one plug is misfiring or dead then its into limp mode to try & stop serious damage happening as in it disables the Turbo etc

Thanks for the reply. I really hope you are right. Fingers crossed. I will update.

 

[Chillipip]

Interested to hear how you’re getting on with your issue.

 

[MXV]

New plugs in today and still the same fault code p1030.
starts and ticks over fine but really doesn’t want to Rev up past tickover so is un drivable.
I’m totally lost with this now.

 

[Chillipip]

Have you tried to wind the VVT lift screw all the way in either direction? I think it’s a 4mm Allen key on the back.

 

[MXV]

I did this. Found it on a mini forum

 

[MXV]

I took a video of the vvt motor cycling the vvt gear and cam back and forth whilst cycling the ignition on and off. All seemed to work fine and always returns to the centre position. Makes me think it is working as it should but I’m no expert. Unfortunately I don’t know how to load videos on this forum.

 

[Pedro]

Any probs with the ECU ?

 

[MXV]

Any probs with the ECU ?

I don’t know. Any tips on how to check?

 

[MXV]

I am now starting to think faulty wiring or ecu now. May need as auto electrician.
Isn’t there an ecu reset procedure??

 

[MXV]

I am now starting to think faulty wiring or ecu now. May need as auto electrician.
Isn’t there a ecu reset procedure

 

[Pedro]

I have not done this on a Z but did do it to a 207cc but that cars ECU was badly repaired & bodged by previous owner so to get the lady up & running I sent it away for reprogramming to get the car back on the road
Follow these instructions
Open the fuse box
Find the ECM fuse on the diagram
Very carefully remove the ECM fuse
Wait for 10-15 minutes
Reinsert the fuse this will clear the memory & return it to default factory settings
This procedure can sometimes clear any fault issues with engine fuel efficiency & emission problems

 

[MXV]

I have not done this on a Z but did do it to a 207cc but that cars ECU was badly repaired & bodged by previous owner so to get the lady up & running I sent it away for reprogramming to get the car back on the road
Follow these instructions
Open the fuse box
Find the ECM fuse on the diagram
Very carefully remove the ECM fuse
Wait for 10-15 minutes
Reinsert the fuse this will clear the memory & return it to default factory settings
This procedure can sometimes clear any fault issues with engine fuel efficiency & emission problems

Thank you, this has got to be worth a try. I will need to find out which fuse it is.
Wouldn’t disconnecting the battery do the same thing?

 

[Pedro]

Would it ?

 

[MXV]

Would it ?

I don’t know.

 

[Pedro]

I have explained the procedure to you so if you don't understand you should seek qualified help?
If you keep disconnecting the battery you are disabling all the electrical functions on the car so basically your opening a can of worms on these variants

 

[MXV]

I have explained the procedure to you so if you don't understand you should seek qualified help?
If you keep disconnecting the battery you are disabling all the electrical functions on the car so basically your opening a can of worms on these variants

Ok thanks for the explanation. I will try it today.

 

[MXV]

So I removed fuse 1 for 15 minutes, refitted and started the engine. Everything is still the same unfortunately.

 

[Pedro]

Possibly might be electrical problem ruling out the ECU-BSI ?
Any fuel pressure checks done to rule out the pump?
One of your plugs being damaged should cause a misfire on start up & lumpy idle but you have no codes from ignition faults

 

[Chillipip]

Is there any difference in the way it runs if you unplug the VVT lift motor?