Problems after car laid up for 5 months

[mr2mk2]

So after not using my rev1 Turbo for five months due to other commitments, I charged up the battery and it started first time and sounded healthy. Unfortunately after approx 10 mins it bogged down and eventually died. I checked plugs and they were black so I put in a spare set of plugs and checked for blue spark OK. No fault codes.I've checked the Coolant sensor, cold start injector switch against the bgb and OK. The AFM wasn't showing the correct resistance figures but after moving the flap quite a few times, the readings were OK.I've swapped the circuit open relay end efi relay with known good ones and tried bridging the terminals in the diagnostics connector to make the fuel pump run continuously and still the problem is the same.It happens at about the time it reaches a third on the temp gauge. Next thoughts are Lambda Sensor but any advice would be much appreciated. Car was running fine before being sat for five months.

[mr2magic]

The question is, is it bogging down due to overfueling or due to air,spark or fuel missing in the mixture....

Have you pulled the plugs straight after it stalls? Can you maybe even smell petrol fumes from the exhaust?

[mr2mk2]

Mr2 magic.
I would say over fuelling as the plugs were black and a smell of fuel out of the cylinders.

[mr2magic]

Then it may be good to check the coolant temperature sensor for the ecu.

[mr2mk2]

Checked that at various temperatures and is OK

[mr2magic]

Did you check the second one too? (Cold start injector time switch)

[mr2mk2]

Yes and that's OK too.

[mr2magic]

Hmm if it really is overfueling then a bad fpr or a hanging injector(s) are all that i can think of tbh.

[mr2mk2]

Thanks for your help. Do you know how to test the FPR and check if the injectors are leaking. It crossed my mind that the Cold Start Injector may be leaking. The bogging down and cutting out happens fairly suddenly when the temp gauge reaches about a 1/3rd and will not rev at this point. I have re tested the CSS and the resistance is correct across the terminals but not between the terminal and earth as per bgb. Does anyone know if the CSS is fitted to any other models as they are quite pricey new.

[mr2magic]

I would test the regulator as per bgb but i don't know how well stocked your toolbox is considering you need some long banjo bolts.....

Injectors are somewhat easier - remove the complete fuel tail from the head while leaving all fuel lines and wiring connected. Then short +b and Fp in the diagnostic connector to get the fuel pump running.

[mr2mk2]

There is a fault code now 35, turbo pressure sensor. I can't see that this would cause the problem. After about 10 minutes, it sounds like it is not running on all cylinders before it dies. Has anyone had similar problems, I've heard that splicing into one of the ecu wires and earthing it can be a short term solution.

[Peter Gidden]

Hmm if it really is overfueling then a bad fpr or a hanging injector(s) are all that i can think of tbh.

Both almost unheard of as faults.

[Peter Gidden]

I've heard that splicing into one of the ecu wires and earthing it can be a short term solution.

And what does that achieve?

[mr2mk2]

Something I once remember reading, may have been a reply from you but I can't find the post or remember the exact details. Something to do with the COR?

[Peter Gidden]

Something I once remember reading, may have been a reply from you but I can't find the post or remember the exact details. Something to do with the COR?

There's a lot of guessing going on in this thread.

COR earth is only required when the COR ouptut in ECU has failed. Has only happened to me twice in 10 years. If it had failed, engine would run for only 2 seconds.

[mr2mk2]

Yes Peter, there is a lot of guessing going on and clutching at straws. Would you be kind enough to give me some pointers please?

[Peter Gidden]

I'd be trying a different AFM.

[mr2mk2]

Thanks. The resistance readings were wrong when I first tested it but after moving the flat about a lot and spraying wd40 inside the electrical connectors it agreed with the bgb, however that's not to say there isn't a problem somewhere along the resistance track. I will try and source another unit. Thanks again.

[mr2mk2]

Found a secondhand afm for £50, Peter, is it worth trying to clean my existing one first before buying an unknown?

[Peter Gidden]

Found a secondhand afm for £50, Peter, is it worth trying to clean my existing one first before buying an unknown?

You can try cleaning (again).

I wouldn't be buying an uknown. Buy or borrow one from a trusted source.