yep, clear all big brakes. It was cool getting the axle length just right so the 9.5" rims sit perfectly under the trailer.

sigh :(

After a week and a bit of running great including a big run last weekend up to Leyburn, it started the same surging fault again on Saturday.

I pulled the plugs this time and swapped out for another set, changed fuel filter and put some injector cleaner in but it still felt a bit laggy - not in its sweet spot like it had been.

But...took it for another run and it threw up P1228 on hard acceleration. Looked that up- 'wasgate failed open (under pressure)'. So, looks like we're back chasing a boost related issue. I'm hoping, it's a crook boost control solenoid. Worst case, I've got that spare housing now so we can swap that over.

Was gutted when it came back on Saturday but the fault code now gives us some direction I think.

P1288 in your case is likely to be tune related. That code is telling you the boost level is lower than desired. It doesn't necessarily mean a mechanical fault

Any advice would be much appreciated also guys.

Thanks for that Ralph. Just so disappointing when the car was running so well after swapping the coils. I've got a track day for Father's Day so hoping we can get it sorted this week. Ratter tells me the plugs are gapped too low at .06 so I'm just about to attack them again for the second time today, lol.

yep that code is in the tune - had mine do it once and clint had to tweak it up a little. Or down. Or whatever tuners do.

I praying all of the issues are tune related old_mate. Car feels great again this morning. I can tell within like 200m if I'm getting either the laggy version, or the good one.

Dropped the other housing off to HTP this morning just in case. Was going to get a new boost control solenoid for them also but I'm going around in circles. Need to stick with what we actually swapped out for this tune and work back from there - including data logging of course. Being an intermittent fault it's just so damn frustrating.

Sometimes you get lucky swapping something out (thought I had with the coils) but not this time around unfortunately.

So far I've replaced coils, plugs, fuel filter. Hardware changes for this tune consisted of ID1000's, Herrod intank, turbo/housing/actuator, dump & cat.

Given the PR smashing MTA have taken of late, I really hope it's not the housing to be honest even though it would make life easier given I have a replacement ready to go. I've already had someone bet me that it will be another bent/tight shaft sticky dud so I'd love to prove him wrong, lol.

Car goes in tomorrow so fingers crossed we finally get a happy ending.

My internet based assumption (baring an mechanical issues) is that your tuner is trying to commanded high levels of boost low in the rpm range. The turbo is unable to produce the desired boost so it logs a fault.

The fix can be as simple of increasing the Wastegate duty cycle to allow the turbo's capability to match the desired boost level, OR if the turbo is already performing as well as it can the desired boost level and duty cycle may need to be reduced.

Or the quick and dirty fix is to adjust the P1288 threshold to a larger value (stock is around -5ingh or around 2.5psi) increasing the value (or actually decreasing at as it's a negative values)means the fault won't trigger.

The biggest benefit and flaw of the factory boost control system is that it is very intelligent and hence it takes alot of time to setup correctly, and it's very difficult for a tuner to simulate all conditions the car will be used in, in the real world.

I've learnt that on some aftermarket ecus, tuners will dial In the desired boost across the entire rev range rather than incrementally and it won't have any problems.

Just food for thought

Edit just saw what ralphy said. something about great minds?

Edited September 1, 201412 yr by MattyP

The issue with a relatively flat desired boost line with the ford system is the PCM with try to command that boost at low rpm levels and as a result will flag underboost errors.

IMHO you are far better off determining an appropriate boost level based on the hardware, then carry out some base line runs whilst loggin desired boost, wastegate DC and DC Error. Then use that info to properly setup the wastegate DC table.