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| Technical / Tuning In need of advice? Or to ask something technical? This is the place |
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27th October 2008, 07:57 AM
| #1 |
| Skyline Enthusiast Registered User  Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| Help needed .Strange engine?/fuel?/boost? cutout Hello Guys recently i got problems with my boost controller and i managed to fix them but now i have the following problem...when on 4th and 5th gear boost level reach around 1.06-1.07 engine or fuel i can not define what is it exactly cut out for a second and after that it continues gaining boost...and this happens sometimes...sometimes it does not happen....car was bought and tuned in UK and it is driven in Bulgaria...could it be bad fuel...cos here fuel is not as good as in UK...please give me some clue because no body else can help me |
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27th October 2008, 04:29 PM
| #2 |
| Conceptua Tuning Authorized Trader  Join Date: May 2008
Posts: 39
| Is the misfire ocurring at about 4500 rpm? |
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__________________  Conceptua Tuning 0800 0 23 44 23 Intl. 0044 1803 85 00 50 http://stores.ebay.co.uk/conceptua-tuning | |
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27th October 2008, 06:13 PM
| #3 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| something like this yes 4000-4500....but there is times that it does not occur....and it happens only above 1.07 bars.....at lower than this boost level it does not happen...i lowered the boost to 1 bar and it is ok ...strange |
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27th October 2008, 06:16 PM
| #4 |
| Has stopped squeaking Administrator Membership No. 395  Join Date: Jan 2006 Location: South East County: Essex Drives: A slow red thing
Posts: 8,746
 | Have you checked the spark plugs and coil packs? |
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27th October 2008, 06:21 PM
| #5 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| no still have not checked them...cos i thought i could not be from them it seemed strange to me ...the problem occurs only at particular boost level....lower than which does not  ...what should i look for ....dirty plugs...i guess...but what about coil packs i am not familiar with them...i had a honda and it has not got coil packs  Last edited by miHo_R33; 27th October 2008 at 06:30 PM.. |
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28th October 2008, 10:35 AM
| #6 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| any guesses....i spoke with all of my country major tuning companies and they have no clue what could cause this strange cut?...please i need help badly |
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4th November 2008, 06:28 PM
| #7 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| Hello Guys today I did some work ...i took off all of the spark plugs to check then ....they are fine ....the coil pack are split fires...and also look very good ...took off the Idle valve ...cleaned it ...i also have some bouncing idle sometimes..after hard driving there is no problem......like 600-700-800-850-750....what could cause this when i have cleaned the ACC..is it possible that the spark plugs at low Idle can not handle with the rich fuel mixture and od this ?.....is it possible to be the AFM...i think i has been changed...cos there was something done to the pins and i had to resolder them back |
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4th November 2008, 06:30 PM
| #8 |
| Half Man Half Partridge Club Member Membership No. 067  Join Date: Dec 2005 Location: In th'ouse County: Cheshire Drives: A 350 without the zee
Posts: 5,074
| What RON is your fuel? I would be careful about turning up the boost if your fuel is any less than 99ron. If it is lower then you should get the car re-mapped to suit your fuel before you melt a piston. |
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4th November 2008, 07:06 PM
| #9 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| Sorry man i don't know what RON stands for....I am driving with OMV 100 octane ....but is it 100octane only they know...I'm thinking of using octane booster and to check the Air/Fuel Ratio....about the remaping....i highly doubt that that there is anyone who could re-map skyline ecu in my country  ....and boost have not been turned up.It is the way it was set |
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4th November 2008, 07:12 PM
| #10 |
| Lambo Door Kits Ltd. Authorized Trader  Join Date: Jan 2008 Location: St. Andrews County: Fife Drives: R33 GTST
Posts: 1,776
| is your fuel pump kicking out enough fuel? what flow rate is it? |
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__________________  http://www.lambodoorkits.co.uk http://www.carbon-designs.co.uk Authorized dealers for Ibherdesign, Blitz, cusco, HKS, Jun, C-West, The list goes on. Supplier of Carbon Goodness! | |
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4th November 2008, 08:31 PM
| #11 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| rated 600hp ...fitted a month ago ...and car way dynoed |
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5th November 2008, 11:08 AM
| #12 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| did some more testing this morning....after cleaning the Idle valve ..the car began to jump the rpm in greater limits.....like 500-600-700-800 damn....today i took off the idle valve again cleaned it also again...my question is what is the thingy with the purple socket and connector....does it play any role in idle....also checked the AFM when a disconnect it car shuts off...so it must be working....also there was ground wire disconnected ....attached to the exaust manifold cover...what is it for ....ooh and when i disconnect the Idle valve connectors nothing happens....rpm stay the same they do not drop....please give me a clue what else i should look...car still cuts at 1.10 bars on 4th and 5rd and sometimes on 3rd when not reached optimal working temperature...after that it's Ok...why doing it randomly?...please help...reading tech threads for 2 weeks now and still have not found answer to my problem ooh and car mods are as follows 1.HKS Front mount Intercooler kit 2.Split Fires 3.Apexi Turbocharger 4.HKS 4" full stainless steel exaust system 5.ECU re-maping 6.Bosch 600hp External Fuel Pump 7.HKS Induction Kit 8.Greddy E01 thats the mods i have found out that are made ...but not sure if this is all Last edited by miHo_R33; 5th November 2008 at 11:13 AM.. |
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6th November 2008, 03:08 PM
| #13 |
| Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Plovdiv County: Outside UK Drives: R33 GTST
Posts: 30
| Cleaned the AFM with carb cleaner today...and replaced the air filter ....still nothing should i try with fuel filter replacing....and my spark plugs were fine but they are Denso...and as i read somewhere here they are total crap |
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