488 replies to this topic

[Andrew aka Stuwy]

[fezzasus]

Some updates.

 

it passed the MOT second time round, with the addition of a front numberplate (ran out of time before the first MOT).

 

put 50 miles onto it and an initial fuel learn to dial it in at low revs. Needs a lot more work as it's pretty nasty at low revs. For now i'm chasing faults; I have an intermittent P1512 (throttle position fault) and issues with the secondary lambda sensor.

 

going to put a few more miles on it to allow run in, hopefully eliminating these codes too.

 

Boot release is also ruined, want to keep the same release mechanism so have ordered 1.5 mm diameter bowden cable (same as original diameter) and outer sleeving. Really don't want to have to drop the fuel tank

[ArticMonkey]

What throttle body are you using? 68lsj or LS4?

[fezzasus]

LSJ. Same one I had fitted with the old engine, other than a short trip in the post it's been sat around indoors. My biggest fear is corroded connectors at the moment but none of the ones I've inspected seem to have an issue.

Edited by fezzasus, 17 July 2016 - 07:47 PM.

[ArticMonkey]

I've not driven my car for near on 2months and today I stretched it's legs since then. After a drive to get fuel I forgot to put my power pack on the bat (was flat) and the car had a meltdown and wouldn't run. Was getting the same codes as you and after putting my old LSJ on. The ecu learned it's throttle position on idle again and it run fine. Put the LS4 straight back on and it was fine again. The bat being so low caused all my issues and the ecu logged them all before hand and kept popping up codes. Maybe try another TB or re set the ecu so there's no more fault logs.

Edited by ArticMonkey, 17 July 2016 - 07:54 PM.

[CHILL Gone DUTCH]

Tom Is your cool pack springs stretched enough Also make sure it's firm on the spark plugs

[fezzasus]

I've not driven my car for near on 2months and today I stretched it's legs since then. After a drive to get fuel I forgot to put my power pack on the bat (was flat) and the car had a meltdown and wouldn't run. Was getting the same codes as you and after putting my old LSJ on. The ecu learned it's throttle position on idle again and it run fine. Put the LS4 straight back on and it was fine again. The bat being so low caused all my issues and the ecu logged them all before hand and kept popping up codes. Maybe try another TB or re set the ecu so there's no more fault logs.

 

Thanks, i suspect i'll need to run it a bit more before I eliminate all the hibernation codes. Also have a friend with a spare LSJ to test so will try at the weekend.

 

 

Tom Is your cool pack springs stretched enough Also make sure it's firm on the spark plugs

 

I've goat foam between the coil pack and cover, however have taken it off to add bolts. Springs are 50 mm despite being convinced I stretched them more. Will stretch them to 65 mm and put them back in.

[fezzasus]

Looks like the P1512 fault has gone, but i'm still getting seconday lambda faults at full temperature. Full detail of the P0141 fault as follows:

 

[color=rgb(0,0,0);font-family:verdana, sans-serif;background-color:rgb(221,221,221);]As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0141. See also: P0135 (Bank 1, Sensor 1).[/color]
 

Certainly sounds like i've got a dodgy secondary lambda sensor. Any idea if I can still map with this? I know OBD Tuner doesn't work with some faults, however this fault appears somewhat cosmetic

[fezzasus]

Tom Is your cool pack springs stretched enough Also make sure it's firm on the spark plugs

 

Thanks Chris, car's running much better now i've bolted the cover to the coil pack and extended the springs again.

 

Not sure if the vibration compressed the springs, if I didn't stretch them enough to start with or if stretching reduces the compression strength and means this will happen regularly. Might look out for longer springs.

[Mangham54]

Check the cable on the post cat sensor as mine had failed part way along. They don't like being repeatedly bent/twisted and you may feel a broken core part way along. You can cut out the break and solder / crimp it back together fine. Saves arsing around trying to remove the sensor as my wouldn't budge.

[CHILL Gone DUTCH]

You need both lambda working Tom I can't remember what happened with you original engine but if it failed change both lambda anyway as they could of been damaged by bits of engine If these are not 100% working OEM lambda you could end up with a issue when fuel learning Chris

[fezzasus]

You need both lambda working Tom I can't remember what happened with you original engine but if it failed change both lambda anyway as they could of been damaged by bits of engine If these are not 100% working OEM lambda you could end up with a issue when fuel learning Chris

 

Old secondary lambda was left on the old cat section as I couldn't remove it, odd as it's the only one i've had to replace before.

 

So I now I have a generic. Will aim to replace with a branded one ASAP.

[oakmere]

Get the NTK sensors as they appear to be identical to oem and are a reasonable price 👍

[fezzasus]

Put about 30 miles on it yesterday doing a fuel learn along the B4494, only to discover it hasn't recorded any measurements. In total have completed around 100 miles. Going to continue to put miles on it and conduct fuel learn sessions until I hit 500 miles, perform an oil change, then treat it as a normal car.

 

The car really pulls well as it comes on cam, overall very happy with it. Just need to replace the secondary lambda with a NTK one to stop it throwing up an error (likely the reason it didn't record any measurements).

[CHILL Gone DUTCH]

After starting the fuel learn Tap the throttle If the eml flashes your successfully in learn mode Once you done that drive for 1 min Then read the Ecu to PC Should bring a learn tab up which will have the previous 1 mins data on Continue to drive and regularly read the Ecu to PC and the table should start to fill more Good idea to save each time then if somthing goes wrong you can still get the data back to put on Ecu

[fezzasus]

After starting the fuel learn Tap the throttle If the eml flashes your successfully in learn mode Once you done that drive for 1 min Then read the Ecu to PC Should bring a learn tab up which will have the previous 1 mins data on Continue to drive and regularly read the Ecu to PC and the table should start to fill more Good idea to save each time then if somthing goes wrong you can still get the data back to put on Ecu

 

Yup, know how it works . Was in fuel learn but didn't check for data until the end of the drive. I suspect the intermittent lambda fault stopped it from saving the data (despite Peter saying I could fuel learn with the fault). Now a priority for me to change the sensor. will switch to periodic reading from ECU but now much point until I sort the lambda fault.

[CHILL Gone DUTCH]

If it dosent work after the 1 min drive Then there is a issue so don't bother going any further

[fezzasus]

Update: Fuel learn up to around 5000 rpm is complete. Car has done around 250 miles and i'm starting to stretch it legs a bit. Negative fuel trim at low loads but positive at high loads. Need to check if the fuel pump is delivering constant pressure across the load/speed range as I suspect this is the weak point now.

 

[smiley]

My experience is that injectors give a high % duty cycles over 6.5k rpm on basemap.

As the software cannot correct over 3.5k isch without a wideband, you will be stuck with rich fueling higher up the band.

(my peak went from 100% to 84% after 1 wideband correction run)

 

How are the duty cycles on high rpm atm?

 

 

[fezzasus]

My experience is that injectors give a high % duty cycles over 6.5k rpm on basemap.

As the software cannot correct over 3.5k isch without a wideband, you will be stuck with rich fueling higher up the band.

(my peak went from 100% to 84% after 1 wideband correction run)

 

How are the duty cycles on high rpm atm?

 

 

 

What makes you say the software can't correct above 3.5 k?

 

My understanding is that it can correct, however as you have to run in open loop so risk damaging the engine if the fuel trim is significantly different to target. Obviously the potential for deviation from target increases with power output making people with high power more at risk.

 

I'm measuring duty cycles this week, priority so far has been getting the car running properly.