525 suddenly runs rough. Help.
07-24-2012, 03:05 PM
#11
Charter Member # 545
Gold Member
Had a similiar problem but on a 700. Had SmartCraft and it said IAC output failure. I changed the IAC and the motor ran the same. Turnes out that something took out the IAC driver in the ECU. Had Dustin remap the driver and it ran fine. Just something to check..
07-26-2012, 12:55 PM
#12
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Did a code read out. Nothing conclusive. Leak down is next, and since there is a "noise", whistling, houwling sound that goes away with valve cover plug removed, seems like valve issues. F'ing CMI's again. GGGRRRRrrr
07-26-2012, 04:05 PM
#13
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fixx
........you just use the gas from it with a hose attached to the tip,,with the engine running the gas is heavier then air and it will seep into the vacume leak..or you could use carb or brake cleaner and phuck up the color of the blue paint..this is why i use the gas from a propane torch,,,it dont phuck anything up..when it seeps into the leak the engine will smooth out and thats how you can tell if its a vacume leak..the whistle from the valve cover could just be coming from the pcv hose whistleing and when you take the oil cover off it goes away..
