MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: krisbutler02 on March 14, 2013, 01:59:28 pm
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My GTI had the AXX engine in that used to idle like it had lairy cams ,
This engine dropped its thrust bearings so now have a Audi S3 BHZ engine fitted with all the AXX sensors and ancillaries.
This engine does the same, it has a different map now (stage 3 revo K04 file)
Its so lumpy its not right
I have the forge catch can so no PCV issues, i have checked for air leaks and the vacuum in 0.8 bar at idle.
New iridium plugs , new MAF , APR fuel pump ,New in tank fuel pump. cam lobe and follower are fine, N80 purge valve works fine. cant find any air leaks , all boost pipework is new / silicone.
Dump valve is sealing and perfect
What else could cause this im kinda stuck now
The idle is around 700-750 RPM
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Any ideas how to raise idle in vagcom?
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Have you changed the coilpacks too?
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Yes just tried another set of coil packs.
starting to annoy me now haha
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Any ideas how to raise idle in vagcom?
You can't.
Clogged up intake valves causing low idle?
How many miles has the new engine done in its previous life?? Emmisions test to check for hydrocarbons would indicate coked up cyl.head.?
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Cleaned manifold and intake valves just before engine went in.
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Throttle body?
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also cleaned and reset via vag com along with the manifold flaps.
also run super unleaded shell v power always and did put some injector cleaner in too
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also cleaned and reset via vag com along with the manifold flaps.
also run super unleaded shell v power always and did put some injector cleaner in too
Have you tried running it on the stock map to rule out the remap?
Then I'd look at the bits that don't normally fit the BHZ engine if you've mixed from AXX perhaps?
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I have switched the sps to stock and its the same.
the only thing left on the BHZ engine that isnt what i swapped over on the axx is the camshaft sensor. and the injectors
im going to get a new inlet manifold with new thrust sensor.
Thats all i can think of to do next.
Only thing i do wonder is if the single mass flywheel (sachs) would make it idle funny due to the weight difference.
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Have you checked/replaced the primary o2 sensor ??
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I have the same problem on my axx engine and can't find why
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Is tha pre cat or post? Funny you should say that as my liquid gauge always reads rich even at wot doesnt go below 14 afr
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14 is lean for wot. Should be 12. 14.7 when cruising.
Have you read the missfire counters and whats your idle fuel trim like?
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It says missfire dissabled.?
The Liquid gauge is lying vag com logs .77 Lambda
How do i read fuel trims ?
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says requested 1 lambda at idle and its 1 specified.
Damb cars
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Here is a 4th gear run log from today
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fn19%2Fkrisbutler02%2FUntitled.jpg&hash=eb6e170d7f90c5eb19f77c92a281d70a4512be12)
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logs on idle
Marker TIME Group 1 - Field 0 TIME Group 2 - Field 2 TIME Group 2 - Field 3 TIME Group 14 - Field 2 TIME Group 31 - Field 0 TIME Group 31 - Field 1 TIME Group 32 - Field 0 TIME Group 32 - Field 1
STAMP Engine Speed STAMP Injection - Timing STAMP Intake Air Mass STAMP Misfire - Sum Counter STAMP Lambda Sensor - Current Value STAMP Lambda Sensor - Specified Value STAMP Lambda (Idle) - Self-Adaptation STAMP Lambda (Partial) - Self-Adaptation
/min ms g/s % %
0.64 760 0.78 1.02 0.78 3.64 0.91 0 0 0.98 0 1 0.13 -0.7 0.13 -0.4
1.63 800 1.76 1.02 1.76 3.17 1.89 0 1.02 1.1 1.02 1 1.14 -0.7 1.14 -0.4
2.66 760 2.79 1.28 2.79 3.25 2.93 0 2.02 0.95 2.02 1 2.15 -0.7 2.15 -0.4
3.69 760 3.82 1.02 3.82 3.28 3.96 0 3.05 1.04 3.05 1 3.18 -0.7 3.18 -0.4
4.72 760 4.85 1.02 4.85 3.61 4.99 0 4.08 0.96 4.08 1 4.21 -0.7 4.21 -0.4
5.75 720 5.88 1.53 5.88 6.03 6.02 0 5.11 1.02 5.11 1 5.24 -0.7 5.24 -0.4
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Car needs to be running for a while before the missfire detection becomes enabled.
Trims on 032 look fine.
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Is tha pre cat or post? Funny you should say that as my liquid gauge always reads rich even at wot doesnt go below 14 afr
Its pre-cat mate, £135 from TPS, if this is the problem of course
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Need somone to have a look ill get a video tomorrow sounds like a rally car idleing .
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Was that log taken in 4th gear at WOT?
At 4.2k your making about 191HP, less than a Stage 1 K03 - however you then go on to make a full 307HP at max revs (estimated). :confused:
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Yes thats at WOT it does seem low but i havent a clue why.
Any ideas ?
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Could be due to the fluttering boost
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Here is a log from today with a bit more info
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fn19%2Fkrisbutler02%2FMk5saturday16thmrch.png&hash=020f0ace2d242f6a38eb24f197657a2be8f8b32b)
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The boost seems to be requesting low values and also fluctuating along with the maf reading fluctuating.
What could cause all these problems.
I need to take it to someone with the know how as im stumped.
This is stage 3 with all the mods you can get bar WMI so surely should be making alot more power than the calculated 307 bhp!