Can a cam "slip" out of position
08-19-2007, 12:50 AM
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Can a cam "slip" out of position Story is picked up car with H&C mods (476RWHP/438 RWT 
) last sunday, ran fine. Drove it hard in the canyons the next day for 1.5 hours. Ran fine throughout.
Next ran car thursday night, engine had trouble idling, running like it had a big cam in there (the actual cam in there is a 224/228 114). When you pushed on the gas, it bogged. About 1 mile down the road, CEL came on.
Checked for leaks, there seem to be none. Manifold is a FAST and all the bolts are troqued down and the seals are good. Took the car to a shop today, there is only 1 code:
P0106 Manifold Absolute Pressure (MAP) Sensor Performance ECM DTC P0106 in Engine Controls - 6.0L
The guy running the code builds hotrods. He says manifold vacuum is weak and agreed with me there were no leaks. He thinks the cam may have slipped out of alignment and could cause serious engine damage if I continue to drive it.
Is this possible and if so how can it happen?
The MAP sensor visually looks OK and seems to be functional. I am pretty sure the tuner did not use an adjustable cam sprocket.
If not, what might the problem be? Any ideas?
) last sunday, ran fine. Drove it hard in the canyons the next day for 1.5 hours. Ran fine throughout.Next ran car thursday night, engine had trouble idling, running like it had a big cam in there (the actual cam in there is a 224/228 114). When you pushed on the gas, it bogged. About 1 mile down the road, CEL came on.
Checked for leaks, there seem to be none. Manifold is a FAST and all the bolts are troqued down and the seals are good. Took the car to a shop today, there is only 1 code:
P0106 Manifold Absolute Pressure (MAP) Sensor Performance ECM DTC P0106 in Engine Controls - 6.0L
The guy running the code builds hotrods. He says manifold vacuum is weak and agreed with me there were no leaks. He thinks the cam may have slipped out of alignment and could cause serious engine damage if I continue to drive it.
Is this possible and if so how can it happen?
The MAP sensor visually looks OK and seems to be functional. I am pretty sure the tuner did not use an adjustable cam sprocket.
If not, what might the problem be? Any ideas?
08-21-2007, 10:50 AM
#5
Moved from Advanced Tech section. More eyes in here.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
08-21-2007, 11:14 AM
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The only way for a cam to 'slip' like you're describing is for the timing chain to jump a tooth, and I don't know how common that is on these cars.
Do you have cranking compression data from when you got the car? If so you could check the old data vs. now and get an idea if the valve events have changed.
Do you have cranking compression data from when you got the car? If so you could check the old data vs. now and get an idea if the valve events have changed.
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08-21-2007, 07:00 PM
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MAP sensor..........change it. THere is no way to "visually" inspect a sensor. The symptoms you are describing are MAP sensor. Change it and all your problems will be solved.
08-22-2007, 07:14 AM
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Also make sure the MAP sensor is seated in the FAST well. I know many folks have had issues with the MAP sensor gasket and the FAST not sealing. A little sensor safe RTV will do the trick.
