[patonjames]

A big thank you to Imran at Evolve on Friday who had the patience to look back over my 335i E91 after a Stage 1 originally done back in December.

The car had a strange pulsing in 4th gear on part throttle acceleration from around 60mph. I had changed the Vanos solenoids, spark plugs and had the inlets Walnut Blasted but the car still had the same symptoms. The car never threw any fault codes.

After driving back up to Luton, the guys checked back over the map and reloaded then dynoed only to find the car making just below stock power with lots of peaks in the power and a huge drop off at higher revs.

I thanked the guys and continued my journey to Leicester. Later that evening my drive home was 'spirited' and half way down the M40 every service message I could think of came up. Transmission failure, DSC failure, ABS failure and service overdue by -60000miles. I pulled in around Oxford, shut the car down after cooling and waited 5 minutes. When I got back in, all faults cleared and the car is now a missile!

No more pulsing and a very strong surge for the redline.

I have no idea what the issue was but now have the car I thought I'd originally bought.

Thanks guys!

[SO8]

Service overdue by 60K ... cool

[old grey steve]

Originally Posted by patonjames

A big thank you to Imran at Evolve on Friday who had the patience to look back over my 335i E91 after a Stage 1 originally done back in December.

The car had a strange pulsing in 4th gear on part throttle acceleration from around 60mph. I had changed the Vanos solenoids, spark plugs and had the inlets Walnut Blasted but the car still had the same symptoms. The car never threw any fault codes.

After driving back up to Luton, the guys checked back over the map and reloaded then dynoed only to find the car making just below stock power with lots of peaks in the power and a huge drop off at higher revs.

I thanked the guys and continued my journey to Leicester. Later that evening my drive home was 'spirited' and half way down the M40 every service message I could think of came up. Transmission failure, DSC failure, ABS failure and service overdue by -60000miles. I pulled in around Oxford, shut the car down after cooling and waited 5 minutes. When I got back in, all faults cleared and the car is now a missile!

No more pulsing and a very strong surge for the redline.

I have no idea what the issue was but now have the car I thought I'd originally bought.

Thanks guys!

Interesting... Am I guessing the car was re mapped second time around to stage 1 again?

[patonjames]

Yes, it was to reload a Stage 1 remap.

I'm wondering if there was some residual oil/carbon clogging O2 sensors or Cat after the walnut blasting and that has now been blown out.

Driving it again today, it's clear that something has now freed up. It pulls hard all the way to redline with no pulsing or hesitation.

I'm going to run it down to TWG this week to check fault codes just to be sure nothing threw up recently.

[old grey steve]

Originally Posted by patonjames

Yes, it was to reload a Stage 1 remap.

I'm wondering if there was some residual oil/carbon clogging O2 sensors or Cat after the walnut blasting and that has now been blown out.

Driving it again today, it's clear that something has now freed up. It pulls hard all the way to redline with no pulsing or hesitation.

I'm going to run it down to TWG this week to check fault codes just to be sure nothing threw up recently.

I was interested in your surging sensation at a guess I was thinking you might well see a recorded monitoring engine torque limiting fault either current / stored or present code wise 2D5A as you may get this sensation on a re map'd car where the obvious is detected. Seen this a couple of times on re map'd 335's. Just a theory mind but your visit if you go through with it to TWG will enlighten you as whst ever the issue you had per switching off/on will I'd expect be stored.

You've also got various sensors on board that could be playing a part, again you might have stumbled upon a "miracle cure " by switching off/on. If so a record of this hopefully will be stored but not current/present.

The other thing that interested me was all your lights on along with the various faults. Again and this is only a guess based on how you've described the event on your OP but I'd say there's some CAN communication issue(s) could be ECU centred I've seen cars with unknown ECU faults which cause communication errors when flashed with latest BMW software these issues disappear or could be again CAN re instrument cluster communication.

So so difficult but once "diagnosed usually all is revealed" switching off/on would indicate several different conclusions IMO none of which I'd be certain of, but I'd be very interested in what you discover.

One thing though I'd dismiss is walnut blasting effects if something had gone wrong here you'd pick up on it the moment the engine as back together and fired up.

But I do look forward to your updating us. Love these sort of issues and it's quite educational

[patonjames]

The car is booked in for Wednesday. Will report back when i know more.

[old grey steve]

I was trying to think of the DSC errors seen when engine's have been known to surge, the one I'm aware of is 5E19, which is engine management interface while on the engine from apart from torque monitoring you may see as I've done on a couple of occassions 2D59 which displays DME actual torque monitoring which is a DME internal fault.

Hope all goes well Wednesday.

[jwilliams]

I found the Evolve map to be very placid and have a N/A feel to it. Had to rev it so hard for it to move it felt almost stock. I assume now you have had a reflash the new Stage 1 may have been tweaked which may be why it pulls so much harder.

[patonjames]

The car was taken into TWG today (by the missus as Im up in Leicester on business) and spoke to Will after plugging into the OBD and checking diagnostics.

There were Comms Failure fault codes and all wheel sensors threw a fault code. But apart from that, nothing else. Fuel Pressure slightly lower than normal, but not at a level of concern (e.g. HPFP fail)

He drove the car and said it felt 9/10 of the performance he would expect at stage 1.

It would be great to get back on a dyno just to see if anything has changed since my drive home last Friday.

[old grey steve]

Originally Posted by patonjames

The car was taken into TWG today (by the missus as Im up in Leicester on business) and spoke to Will after plugging into the OBD and checking diagnostics.

There were Comms Failure fault codes and all wheel sensors threw a fault code. But apart from that, nothing else. Fuel Pressure slightly lower than normal, but not at a level of concern (e.g. HPFP fail)

He drove the car and said it felt 9/10 of the performance he would expect at stage 1.

It would be great to get back on a dyno just to see if anything has changed since my drive home last Friday.

do you know what the comma codes were? If you had several be interested to see what they were. Reason for interest is the fact thst seen various codes issues with these cars before..

Pleased you're cars back to rude healthby TWG

[patonjames]

I can ask and report back.