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Actuator issue or mapping required?
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Old 27 Apr 2011, 12:36 PM   #1 (permalink)
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Actuator issue or mapping required?

Hi all,

I have searched high and low for clarity relating to boost issues and from experience, the simplest things are often overlooked!

I have a year 2000 UK turbo (wagon if makes any difference) which has a full decatted exhaust and was remapped by Power Engineering a couple of years ago by the previous owner. All seemed hunky dory when I bought it and after servicing and new clutch a few weeks ago it was great. Boosting to 1.1 bar on the guage and peaking a tiny bit over that if floored in 5th.

Bit of an issue with boost developed in the last couple of weeks - there seems to be a bit of a cough/splutter when booting it and the boost seems to have dropped off slightly to 1 bar (not much but I can feel the difference). Do these things need mapping every so often or could there be an issue with lamda/plugs/plug leads etc?

Before my recent spluttering, the boost seemed to tail off from around 5500rpm and reduce as the revs increase...would a sparkley new boost actuator fix this or has this got something to do with the way the car was mapped?

Sorry if this has been covered and I missed it but you help as ever would be appreciated
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Old 27 Apr 2011, 01:47 PM   #2 (permalink)
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Re: Actuator issue or mapping required?

are you using the same fuel and is it down on boost during the hot weather or is it the same at night when its cooler ?
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Old 27 Apr 2011, 02:36 PM   #3 (permalink)
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Re: Actuator issue or mapping required?

Same Tesco Momentum, same stuttering day and night. Must admit, I thought it was down to the missus putting normal 95 ron petrol in but that was a number of tanks ago.

Started doing it after the clutch was changed weirdly!
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Old 27 Apr 2011, 02:41 PM   #4 (permalink)
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Re: Actuator issue or mapping required?

have a look around make sure all the earth straps have been reconnected after the clutch swap,
could also be worth checking the TMIC hose clips are tight if the TMIC has been off maybe,
also what Dump Valve do you have, maybe that's getting a little weak and ur loosing a bit of boost,
all guess work if honest.
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Old 27 Apr 2011, 02:54 PM   #5 (permalink)
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Re: Actuator issue or mapping required?

Thanks for the advise - will check this out.

No dump valve, just standard turbo set up - can you confirm what the TMIC hoses are?

Cheers
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Old 27 Apr 2011, 04:25 PM   #6 (permalink)
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Re: Actuator issue or mapping required?

might need an ecu reset after the bad petrol the missus put it is used up
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Old 28 Apr 2011, 10:58 AM   #7 (permalink)
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Re: Actuator issue or mapping required?

Hi Shambles,

The low octane petrol was used a while ago and I have since filled up about 5 times with the good stuff - I thought the car would sort itself out after a minor issue such as low quality fuel?

Perhaps I'll try some decent fuel cleaner...

Any other thoughts regarding the boost tailing off as the revs rise or is this normal?
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Old 14 May 2011, 07:49 PM   #8 (permalink)
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Re: Actuator issue or mapping required?

Hello gents,

Apologies for the delayed response - I have been busy in the run up to our wedding next week!

Anyway, I managed to get some boy time today so I treated the Scoob to a new set of Vreddies (sourced via clickontyres.com, cheap and mega fast delivery), got all the tracking done and managed to reset the ECU.

Result - one quick, full boosting Scooby with much improved handling

Cheers Shambles for the ECU advice!
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Old 14 May 2011, 08:32 PM   #9 (permalink)
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Re: Actuator issue or mapping required?

Glad you got it sorted
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Old 09 Jun 2011, 01:06 PM   #10 (permalink)
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Re: Actuator issue or mapping required?

Alright all,

Just a bit of an update - the reset worked, but not for long! Worked a couple more times and then the boost was cut to about 0.4 and 0.5 bar

Drove it a couple of times and after struggling against a diesel mondeo, I took it into Paul at Extreme Scoobies who diagnosed the issue as the MAF. All sorted and picked it up this morning and christ is it quick!

Very happy scoob, looking forward to blasting down to Newquay next weekend!
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