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 Old 03-12-2019, 10:12 AM   #1
 
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Default Big headache, help.

About 1 month ago my cel came on with the code p0171 system too lean and within the same week my car started, what I felt was, overboosting (my rev and boost would climb up quickly while barely pressing the throttle). I assume this was because the system lean so a leak existed. Checked everything and found nothing loose or cracked. I bought the car used and the previous owner had a blow off valve and cobb intake with turbo inlet hose. I put the stock bypass valve on and the code went away, but my ltft remained at about +12. And the overboosting remained. I took it to the dealer and they said since no cel they have no diagnostics they can do. But a mechanic drove my car and he said the overboosting I felt might actually be the clutch slipping. And they said the car running lean could be due to the cobb intake and inlet hose. So today I bought an accessport and did some logs. One at idle and driving on the street and the other at 4th gear wot that I've attached. After I did the wot log I was driving home and I noticed my car would shake a bit if I revved high. I got scared and I haven't moved it since I got home. My car has also been emitting a burning smell for the past few days. Did I mess up the engine, or is that due to the clutch been almost done? Also anything abnormal in my logs that can explain my lean code or any other issue? Kind of inexperienced so bare with me if I'm stating obvious fixes.

Here's a video of the my revs jumping: https://youtu.be/7cpcUt_qEpU
Attached Files
File Type: csv idle and street driving.csv (81.7 KB, 0 views)
File Type: csv WOT 4th.csv (42.2 KB, 5 views)
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 Old 03-12-2019, 03:27 PM   #2
 
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didn't look at logs but that looks like clutch slip to me, especially with the burnt smell.
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 Old 03-12-2019, 04:28 PM   #3
 
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Curious what phenomenon gave you the inclination that it was overboosting?
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'06 MS6 GT-167k Miles(Forged@157,116)
Manley Pistons & Rods, King Bearings
Stock Head/Cams, Stock Int/Exh Manifolds
Versatuner, 3-bar MAP, ITV22, CP-e TMIC
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2008 GSX-R 1000 - Stolen (With several runs past 180, I'd probably be dead by now if it wasn't stolen. So in a way, I'm thankful.)
1988 RX-7 TII - Sold (Megasquirt, streetport, filter-on-turbo SRI, custom TBE, 20psi boost creep on OE turbo, OE TMIC on ice, 13.467 @ 105.44)
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 Old 03-12-2019, 07:05 PM   #4
 
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Originally Posted by Fstrnyou View Post
Curious what phenomenon gave you the inclination that it was overboosting?
First and foremost, I'm relatively inexperienced. I've only been been driving for 4 years and this is my second car, my first being a complete bucket. I assumed it was overboosting because of the lean coming in within a day or two of the boost climbing too fast. So I thought because of the lean code that too much air was getting in which was causing the overboosting.
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 Old 03-13-2019, 11:24 AM   #5
 
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What was the boost going up to?
__________________
'06 MS6 GT-167k Miles(Forged@157,116)
Manley Pistons & Rods, King Bearings
Stock Head/Cams, Stock Int/Exh Manifolds
Versatuner, 3-bar MAP, ITV22, CP-e TMIC
CS Turbo/DP/RP/HPFP/BPV/R-DiffMount
White Widow F-DiffMount, Whiteline RSB
Rear Russian Bushings, Poly FSB Bushings
Magnaflow CBE, ACT 6-puck/Streetlite
JBR Tru-3.5/3-port EBCS/EGR-D
Damond RMM/PMM/OCC/PCV Plate
Other rides:
2002 Tacoma ExtCab 2.4L 5spd 2WD - 355k mile Speed support vehicle.
2004 Olds Alero ECOtec 2.2 - Broken (since Christmas 2015 and I really need to get rid of it)
History:
2008 GSX-R 1000 - Stolen (With several runs past 180, I'd probably be dead by now if it wasn't stolen. So in a way, I'm thankful.)
1988 RX-7 TII - Sold (Megasquirt, streetport, filter-on-turbo SRI, custom TBE, 20psi boost creep on OE turbo, OE TMIC on ice, 13.467 @ 105.44)
1985 Camaro - Sold (est. 265bhp 5.7 swap, Edelbrock intake & Hooker headers)
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 Old 03-13-2019, 11:42 AM   #6
 
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12psi in the log isn't overboosting.....if RPM and boost raise faster than it should especially in higher gears....Either someone installed nitrous during your sleep and forgot to tell you or...your clutch is slipping...
Don' forget we have a dual mass FW that isn't easy to be machined...The selected clutch kit must include a solution for this....

and your cel is another different thing related to a leak or a larger intake bringing the maf reading too low for what the ecm is programmed for (Maf cal) and O2 report a system too lean after trying to raise fuel amount....
On the log, we can see your AFR being close to 13 under boost and this usually mean the maf reading is too low. this bring knock condition that is also seen in the log...and all that can end up by the need of a new engine.
this need to be solved asap.
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 Old 03-14-2019, 06:18 AM   #7
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the clutch is slipping so bad that it prolly can't even hit enough load to boost past 12psi

and like he said, you have a legitimate air/fuel issue that is bad enough to ruin your pistons/valves.
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 Old 03-14-2019, 07:38 PM   #8
 
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Originally Posted by Jeff23spl View Post
12psi in the log isn't overboosting.....if RPM and boost raise faster than it should especially in higher gears....Either someone installed nitrous during your sleep and forgot to tell you or...your clutch is slipping...
Don' forget we have a dual mass FW that isn't easy to be machined...The selected clutch kit must include a solution for this....

and your cel is another different thing related to a leak or a larger intake bringing the maf reading too low for what the ecm is programmed for (Maf cal) and O2 report a system too lean after trying to raise fuel amount....
On the log, we can see your AFR being close to 13 under boost and this usually mean the maf reading is too low. this bring knock condition that is also seen in the log...and all that can end up by the need of a new engine.
this need to be solved asap.
So it's likely that the lean part is the maf and not a leak? How do I fix that issue?
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 Old 03-15-2019, 09:00 AM   #9
 
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Originally Posted by Sergiospeed3 View Post
So it's likely that the lean part is the maf and not a leak? How do I fix that issue?
No it isn'T what i said.
A leak is possible but it would need to be between MAF and turbo entry side, like a disconnected TIH or anything that can let the turbo suck air that isn't measured with the maf.

And the lean condition under boost may not be the same lean condition that triggered your cel.....Being lean in vaccuum isn't a big issue but being lean under boost is catastrophic. The only way to solve this after making sure it is not a leak, is to have an accurate maf calibration in the tune that match the intake you have on the car.
But prior to have it tuned for this, you need to fix the car because if you update the tune with a leak, it will need to start again and again and again
+ you need a clutch that hold torque to make wot datalogs to validate the maf cal. ...

So basically, you shouldn't use your speed or at least avoid to boost with it until you replace the clutch and you correct the lean condition. The other option is to beat the shit out of it until you vent the bloc and either say speed is garbage or fix everything at once while replacing the engine...
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1993 Ford Probe KLZE 143dB
2012 Mazda3 Gs-sky 6.5l/100 when transporting speed parts
1989 GM 6.2 diesel pickup
Wife drive 2010 CX7

2007 speed3 burned (i'm proud to ran 12.7s with it)

...Because French Canadian...
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