Ford Mustang Forums : Mustang Forum - View Single Post - Please help no power after pi intake swap!!
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post #1 of Old 04-18-2019, 08:47 PM Thread Starter
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Please help no power after pi intake swap!!

Okay so I have a couple different threads on another forum that I needed to replace my daughter's 98 mustang GT intake manifold because it was leaking. The car is 67,000 miles on it and is in pretty much tip top mechanical shape. Without going into too much detail I initially replaced it with a non pi aftermarket intake which leaked vacuum horribly so I decided to go ahead and do the pi intake swap. I purchased a genuine Ford racing performance intake manifold, the associated tube for the heat return a new water pump a new water pump nipple yada yada yada. Well it has been 24 hours now and the RTV has sealed. I took it out for a drive for about an hour today to make sure everything was on the up-and-up. The car feels like it has full power but only over like three and a half thousand RPMs. The car however feels like it is missing or even maybe running on 4 cylinders when under low throttle. I have check for vacuum leaks and there appear to be none. I have quadruple checked every single connector and they all seem to be plugged in. But to give you an idea, this car used to be able to burn rubber when I stomped on it in first gear and now I cannot make the tires even chirp unless I have the wheel all the way turn to the side and Hammer the hell out of the gas. I know I must be missing something but I cannot for the life of me figure out what it is. The car is throwing no codes and I even went so far as to verify that the check engine light does indeed work. I have a bluedriver obd scanner and nothing is coming up amiss. I have checked the oil and it is still clean so no sign of coolant in it. The only thing I can possibly think of is that when I very first started this project I forgot to disconnect the negative on the battery and one time sparked the positive from the alternator on a portion of the block. This just seems too much like I have a connector or a vacuum line not installed properly but I can't find one. The only thing I can see is that the vacuum line going from the back of the throttle body seems to be a bit corroded and cracking and with the use of a stethoscope I feel like maybe I'm hearing some hissing through it. However even if I disconnect it it runs the exact same so I don't really think it's that. I'm certain someone else's ran into this issue but I cannot for the life of me find anyone other than one guy with a crown Vic who seems to have had the same issue the car finally seems to have the appropriate amount of horsepower and torque and go but only after about 4,000 RPMs please please please help I have been working on this for 7 days straight due to ordering a crap NPI aftermarket intake that sucked. It's my 16 year old daughter's car which has recently got a new ball joints, struts, alignment, tires, convertible top, tie rods, brakes, brake bleed coolant flush and everything else that could possibly be wrong. Any help is most appreciated ..

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