Pro Boost FSI remap

Hi,
Interesting, the miss fire issue is probably not related to the mapping changes that the ProBoost map makes we'll see though.
Do you mean "Shell Premium" (which is 95 octane), or "Shell Super Unleaded" (aka V Power, which is 99 octane). An FSI, on the OEM map, should be run on a minimum of 98 octane.
I'd be looking at No 1 coil pack, swop with one of the others, and see if the miss fire follows the swop.
Mac.
 
Hi Mac, no I meant V Power.

I've always filled it with that or the Tesco equivalent since I bought it last March.

Number one coil pack? How many coil packs does this car have?

And isn't this something my garage should have addressed when they last serviced it?
 
There are 4 coil packs, one for each plug/cylinder. Check what the garage did, were the plugs changed? If you asked for service,.that's likely all they did. Unless you have full history, I'd want oil (OEM Spec), filters, plugs etc replaced first service after you taking ownership.
Unless you asked the garage to investigate the miss fire, the garage wouldn't do a (VCDS) scan.
Mac.
 
Hi Mac, I've had new filters, plugs and two oil changes since last March. However, never have asked for coil pack replacements, and having just read Haynes, it sounds like something they won't replace unless issues like this arise. Would that be correct?

They normally do a VCDS scan, so I'll check with them.
 
Hi Mac, I've had new filters, plugs and two oil changes since last March. However, never have asked for coil pack replacements, and having just read Haynes, it sounds like something they won't replace unless issues like this arise. Would that be correct?

They normally do a VCDS scan, so I'll check with them.
My indie does a scan at each service, as well as a good look round/under etc, and would then ask if I want him to investigate. If they did a scan, I'd be surprised if they didn't tell you, if these miss fire issues were present, so, yes, first move talk to them, share your scan results, and see what they think. If your coil packs are original, then they are suspect, as failure of early versions are common across the VAG spectrum. My FSI has had new Bosch coil packs fitted, as has my Mk1 TT (NGK).
Easy DIY job, but buy a coil pack puller on ebay.
Mac.
 
For those reading this who have converted your cars to ProBoost, please do keep a running commentary of miles & type of driving covered, your fuel economy figures, plus of course your impressions (and any issues that arise!).

Genuinely interesting if this does indeed tame the FSI’s foibles and I for one would love to know.
 
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Things have gone a bit quiet with Adrian at Pro Boost at the moment. Understandable of course. Hopefully I’ll get a delivery soon.
 
Hi very impressive site & thread. Im interested in converting to a pro boost ECU but am at least one stage off this. Briefly in Feb I bought a 1.6FSI with issues (Not uncommon). 107K serviced every 20K last one 84k cambelt 55k in 2013. It drove cold ok & 4 new tyres pursuaded me the just above scrap price was worth it. The 310 mile journey home revealed leaking clutch slave & water pump, a missfire or 2 & a big lump of torque missing with an eratic idle. brakes...just, and a gear change like a bowl of cold porridge.

With the interior through the washing m/c & moss m/c polished off it came good but drove like a dog & ticking time bomb. OBD revealed all bad.

So replaced the following now good but almost.

Craked egr pipe, snapped inlet flap arm, 4 iridium plugs, slave cyl, brake bleed, Cambelt (Britttle) Aux belt (Brittle) water pump, stat. The 3 strand earth strap (Coroded). Gearbox oil, gear shift rods re-set. Full tank of Shell vmax through it with wynns gold injector cleaner.

Now goes like stink, drives and looks like a new car...but for the tickover eratic idle. Compression test reveales 1-150 2-190 3-190 4-190. OBD has missfire on 1, no other faults. New coil pack tried on 1 to no avail. Slight eratic idle.

Would I be right in surmising that carbon build up on an inlet valve stopping it closing would be the main culprit? & if so has any one tried seafoam or CRC or GDI sprayed down the air inlet post Maf to clear it with success. Other options to consider would be taking the inlet manifold off and walnut blatsting the carbon off or the expensive option of taking the head off!

Or could ther be another cause to consider?

Any thoughts or comment would gratefully recieved.
 
Have you tried a compression test after tipping oil down the bore?

Just to expand this a little
A couple of squirts of engine oil down the plug hole then do the compression test
If the reading comes up significantly from the same test without the oil then you have piston ring or bore wear. If the reading is the same with and without oil then valves are the culprit
I’ve never come across carbon stopping a valve closing properly
Carbon will restrict the air flow into the engine and this will loose performance

Paul


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Other likely problem would be injector fault


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Thanks for the feedback, if the compression stays the same & carbon build up is ruled out, How could the injector be allowing compression loss? Would an air leak occur & what clues to it failing be detectable? When warm on restart or during tickover a rattle like a diesel occurs. Could this be linked to affecting compression or a separate issue to look at after resolving compression? Cheers.
 
"When warm on restart or during tick over a rattle like a diesel occurs" sounds like a valve operation problem to me, loss of compression would be another symptom. Maybe the hydraulic lifters are not self adjusting as they should? Lack of oil changes or poor quality oil perhaps? Could consider an oil flush. Spanner time methinks.
Mac.
 
Hi,

Good thread, well done!.

Could I order one of these please?.

Thanks
 
"When warm on restart or during tick over a rattle like a diesel occurs" sounds like a valve operation problem to me, loss of compression would be another symptom. Maybe the hydraulic lifters are not self adjusting as they should? Lack of oil changes or poor quality oil perhaps? Could consider an oil flush. Spanner time methinks.
Mac.

Hi the lupo gti engine does exactly the same last about 1-2 seconds


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