After 2 months of attempting to get my car back on the road after a tiny coolant leak somewhere at the back of the engine, she is finally running. put the plenum back on last night - all went smoothly, except for one electrical plug - i can't find where it is meant to go. the car seems to be running fine - although idling a little high - about 1100rpm when warm. Just wondering if anyone recognises this plug: thanks, peter
I think that would be the detonation sensor The only ones at the back are the O2s (2 of) and det as far as I can remember. The sensor is located in the middle of the valley towards the back of the motor.
High idle could be your TPS You need to run a conZult to check your TPS is adjusted correctly (should be .45v at closed throttle) then you might need to use your air idle adjusting screw to fine tune rpm to 800-850 (can't remember what the actual figure is for a manual - no doubt someone will know) Glad to see it's back on the road Peter:thumbsup::thumbsup: Cliff
Yep!- Also would check the ECU codes ... just becuase you plug the det sensor plug in, there may be a fault in the circuit and result is safety boost. Check for code 34 -det sensor circuit open.
I got code 34 Im wondering whether this could be the result of driving the car for 150km or so without the DET sensor plugged in, and the ecu hasn't reset itself??? I only did the ecu diagnostic after i had plugged it in. I am attempting to reset the ECU now, just curious. will check all the resistances tomorrow, just unsure as to whether the ecu 'logs' errors (ie recorded that my sensor wasn't plugged in, and even tho now it may be functioning properly, it is still giving me the code 34 from the fault i fixed) probably makes no sense, peter
Try disconnecting your battery for a couple hours or overnite that should allow the ECU to reset itself. Of course if the code 34 cause is still there, it will automatically be logged again. That's the great thing about getting a conzult on it. Conzult can tell you how many starts since the problem occured and it can clear the codes on the spot and see if they appear again... If not already discussed, your high idle is prob caused by the safety boost mode, your aux fan should be on all the time too...(if it's working)
I reset the ECU - battery disconnected for about an hour and a half. Then i got a code 55...Yay i thought... took it for a drive to see if i could feel the difference - i tried to convince myself that i could, but i dont think it went any harder - and the stock boost guage was still only boosting to 3/4. Did diagnostic when i got home - code 34 again Checked resistance on all 4 associated terminals: Both going to ECU were almost 0 - about 45 ohms as far as i understand - i should have one wire at 0, the other at about 500K ohms - I tested these with the ignition off - is this the way to do it?? One going to det sensor (black wire) was open circuit (as expected) the other was about 580Kohms - should be 1M ohm i thought. What can be concluded from this? (if anything!) thanks heaps, i would love to experience proper boost!!! pete
I disconnected the battery over night - still get the code 34. Im guessing that because of the short i have on the wire running to the ECU, the resistor option will not fix my problems. How do i find where this wire runs to on the ECU - i could attempt to run a new wire to replace the dodgy one. Anyone had similar problems in the past? cheers pete
Try bypassing the det sensor as a test... There is a way to override the ECU's control over safety boost but you gotta eliminate all the usual suspects first.
I have a tiny coolant leak at the back of the engine... Was it one of your water pipes underneath the plenum? John
i didn't find 1 overly obvious leak, although most of the under plenum hoses showed signs of having been leaking. One of my turbo return hoses ended up having a small crack, so that is the most likely cause of my problem - back of engine was steaming up real bad. I just replaced every coolant hose there was, and bypassed all the under plenum hoses then pressure tested the cooling system before i stuck the plenum back on, just to make sure i had no leaks. use a bit of blue silicon on all the hose ends - helps to prevent corrosion and provides extra sealing. eamil or call me if u need anything. cheers, peter
