Wonder if somebody can help me to see what’s wrong with my engine. I have dtc p0101. The problem may be that I have 70-80 kpa in the intake when the engine idles. It should be around 30-45? There are no leaks on the intake. It is a 90mm fast intake. I have pressure tested the intake for leaks. And yes it is correct mounted to the heads. No leaks there. I do know there can be some problems with the valley pan from LS6 and the Fast 90mm intake and the bolts. I have changed different maf sensors and map sensors. The voltage is correct. I have measured all the wires and checked all connectors. All valves are checked and all eight cyl is tested to 9:5 in comp. Engine made for Blower. Yes all the vacuum nipples are checked. All sensors tested on another truck to be sure that they work correct. I have not changed the coil packages yet. Dip stick and oil filler cap is tighten correct. Would it make any different? If there was/ is a leak in the bottom of the engine? Everything is brand new in this engine. Please help me to think clear, there must be something I don’t se. Cam is Comp Cam XR281HR-12 INT 571 EX 573 110 CL LS112,0.
Reg Chris.

 

Some pics in and around the intake may help. Also, how exactly does it act when it cranks and dies? What size cam?

 

1 or 2 bar MAP sensor? and is the tune setup for a 1 or 2 bar?

 

Hi and thanx for answering. It is the original from the 5,3 Engine. The new engine is 5,7.
How can i check that?

 

That cam you have has a lot of overlap, might be normal for it to not build a lot of vacuum. If the relationship between the MAP sensor reading (vacuum) and expected airflow through the MAF sensor are off, it could throw that code. Time to have your tune looked at and changed to compensate for this.


http://www.obd-codes.com/p0101
http://forum.efilive.com/showthread....ight=p0101+cam

 

have the heads been milled at all?

 

No the heads are orignal. No work done.

 

some of the fast manifolds required trimming on the bottom to clear the coolant tubes I think... maybe I am wrong... that could definatly cause a problem such as this.

 

No clerance is good. i have check't that to. Today i have changed both coilpacks. No luck.. Changing ECU later today. It's nothing there, i know.

 

I'm pretty sure your problem is what I listed above. Check it out.