Help 2008 G37 camshaft failure?
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Joined: Sep 2021
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2008 G37 camshaft failure?
Good day from a brand new member.
my local tuner shop said there’s a mechanical failure in my 2008 manual trans g37 cam system and next step would be to pull the engine apart to locate the issue. Thought I’d give it a try and get a second opinion before pulling her apart.
Engine runs fine when cold. Rpm around 650. As it warms up, the rpm goes to between 850 and sometimes 1000 and fluctuates (needle wanders).
When pulling to a stop, rpm sometimes drops, engine almost stalls and rpm jumps to 2-3k whichafter drops back to 850. Also jumpy when taking off (feels like super sensitive gas pedal).
No lights on dash. Only code P0300 Random/Multiple misfire Detected. Brand new sparkplugs and they changed one of the battery terminals.
Can cam/crankshaft sensors go bad even without throwing codes? How often have you heard camshaft itself failing in the VQ37vhr?
thanks for any help!
my local tuner shop said there’s a mechanical failure in my 2008 manual trans g37 cam system and next step would be to pull the engine apart to locate the issue. Thought I’d give it a try and get a second opinion before pulling her apart.
Engine runs fine when cold. Rpm around 650. As it warms up, the rpm goes to between 850 and sometimes 1000 and fluctuates (needle wanders).
When pulling to a stop, rpm sometimes drops, engine almost stalls and rpm jumps to 2-3k whichafter drops back to 850. Also jumpy when taking off (feels like super sensitive gas pedal).
No lights on dash. Only code P0300 Random/Multiple misfire Detected. Brand new sparkplugs and they changed one of the battery terminals.
Can cam/crankshaft sensors go bad even without throwing codes? How often have you heard camshaft itself failing in the VQ37vhr?
thanks for any help!
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Joined: Jun 2019
Posts: 2,626
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From: South Florida
Good day from a brand new member.
my local tuner shop said there’s a mechanical failure in my 2008 manual trans g37 cam system and next step would be to pull the engine apart to locate the issue. Thought I’d give it a try and get a second opinion before pulling her apart.
Engine runs fine when cold. Rpm around 650. As it warms up, the rpm goes to between 850 and sometimes 1000 and fluctuates (needle wanders).
When pulling to a stop, rpm sometimes drops, engine almost stalls and rpm jumps to 2-3k whichafter drops back to 850. Also jumpy when taking off (feels like super sensitive gas pedal).
No lights on dash. Only code P0300 Random/Multiple misfire Detected. Brand new sparkplugs and they changed one of the battery terminals.
Can cam/crankshaft sensors go bad even without throwing codes? How often have you heard camshaft itself failing in the VQ37vhr?
thanks for any help!
my local tuner shop said there’s a mechanical failure in my 2008 manual trans g37 cam system and next step would be to pull the engine apart to locate the issue. Thought I’d give it a try and get a second opinion before pulling her apart.
Engine runs fine when cold. Rpm around 650. As it warms up, the rpm goes to between 850 and sometimes 1000 and fluctuates (needle wanders).
When pulling to a stop, rpm sometimes drops, engine almost stalls and rpm jumps to 2-3k whichafter drops back to 850. Also jumpy when taking off (feels like super sensitive gas pedal).
No lights on dash. Only code P0300 Random/Multiple misfire Detected. Brand new sparkplugs and they changed one of the battery terminals.
Can cam/crankshaft sensors go bad even without throwing codes? How often have you heard camshaft itself failing in the VQ37vhr?
thanks for any help!
It's possible that mechanic utilized a common vehicle specific failure as a blanket to cover EVERYTHING.
It is possible that this misfire could be a Cam phaser/VVEL issue that's out of spec and is not throwing a code but it's manifesting itself as a misfire which is not common.
A quick look at your fuel trims can point you in the right direction of it is a fuel/spark misfire. Proper scan tool can let you know your cam/vvel angles to determine if it's cam related.
You'll need to physically take your car somewhere else to get a physical second opinion, without the data there's only so much we can advice on.
Thread Starter
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Joined: Sep 2021
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A P0300 misfire codes will have your RPMs fluctuating based on if it's a Fuel/Spark/Air leak issue. Usually cam faults leave remnant codes behind.
It's possible that mechanic utilized a common vehicle specific failure as a blanket to cover EVERYTHING.
It is possible that this misfire could be a Cam phaser/VVEL issue that's out of spec and is not throwing a code but it's manifesting itself as a misfire which is not common.
A quick look at your fuel trims can point you in the right direction of it is a fuel/spark misfire. Proper scan tool can let you know your cam/vvel angles to determine if it's cam related.
You'll need to physically take your car somewhere else to get a physical second opinion, without the data there's only so much we can advice on.
It's possible that mechanic utilized a common vehicle specific failure as a blanket to cover EVERYTHING.
It is possible that this misfire could be a Cam phaser/VVEL issue that's out of spec and is not throwing a code but it's manifesting itself as a misfire which is not common.
A quick look at your fuel trims can point you in the right direction of it is a fuel/spark misfire. Proper scan tool can let you know your cam/vvel angles to determine if it's cam related.
You'll need to physically take your car somewhere else to get a physical second opinion, without the data there's only so much we can advice on.
I have an obd reader with live data option. I don’t know if any of the data is cam related but I’ll post it here (cold engine):
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 23.5
ETC (*C) 60
SHRTFT1(%) -4.7
LONGFT1 (%) 0.0
SHRTFT2 (%) -1.6
LONGFT2 (%) 0.0
RPM 838
SPARKADV (deg) 10
MAF 67.4
TP (%) 5.1
O2B1S2 (V) 0.290
O2B2S2 (V) 0.3
EQ_RATB1S1 0.996
O2B1S1 (V) 2.2
FLI(%) 12.2
Baro (kPa) 102
TP_R 1.2
TP_B (%) 4.7
TAC_PCT 4.7
VPWR (V) 14.24
EQ_RAT 0.993
APP_D 0.0
APP_E 0.0
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