Problems going back to stock

[Hartsock]

Hi everyone.

A friend of mine bought an EK4 (96-98) with Skunk2 Tuner Stage3 cams, Skunk2 valve springs, adjustable cam gears, complete exhaust and a mapped P28 ECU.

The plan was to put the car stock again and sell all these mods, so that's what i did. I changed the cams, cam gears, and putted the Stock P2T ECU.

There's where the problems started. On the first start the car was running good but the Check Engine Light was on. I checked all the plugs that I had to take off while replacing cams and they were fine too.

Next the troubleshooting:
The Error codes are 3 (intake manifold pressure), 7(TPS) and 41(oxygen sensor), and now the car can't idle at all, is running very very rich, (spark plugs turn completely black and full of carbon after 5 min of idle) - basically undrivable.


So I plugged again the old mapped P28 and the car runs spot on, with no engine lights!

Is the stock P2T ECU not working properly ? What else can be?



Thanks in advance.

 

[Puggie]

IIRC Map and TPS sensors use the same plug so could be that they have got swapped, O2 sensor might be fine, just coked up from being so rich. strange that the P28 still run fine though, any idea who mapped it and with what. What injectors are fitted?

 

[Hartsock]

ok I will see that plug today, but I didn't touch nothing near the intake manifold while changing the cams... and why is it working good with the P28?

The injectors are stock B16A2
The map was made on dyno on a famous tuner here in Portugal -CeDoisRacing.

Is it possible that some sensor readings are disabled on the P28 so that no engine light come on? but at the same time the engine runs good with that ecu?

 

[Puggie]

Check you get the right voltage at the TPS with the throttle closed, and possibly the MAP if you can. You can force it to run open loop with the P28 and ignore the O2 sensor.

 

[Hartsock]

I've cleaned the O2 sensor and the car is better. The Cel only appears from time to time. I will try another o2 sensor.

Thanks

 

[Hartsock]

Problem solved. It was only a bad ECU

Bought a new one, removed the immobiliser and the car is now fine.


Thanks