Unique problem..need assistance.

[DABEAN212]

I installed a new 308 longblock with Twisted wedge heads, TF Stage 1 cam, etc. etc. I also have BBK long tube headers. The problem I am having is when I start the car, within a min or so, the header tube coming off my #4 cylinder becomes extremely hot (to the point that it was turning red) before the motor even starts to register temperature. I have been told it could be a vacuum leak and its leaning out that one cylinder so I removed/replaced the lower and upper intake gaskets, moved injectors around, adjusted fuel press, timing, and still have the problem. I also have a 1/2" phenolic spacer on my upper intake. The upper and lower are a TF track heat setup with BBK 75mm TB and MAF with 24# injectors. Ive only put about 3 mi. on the motor and roughly 2 hours worth of run time. I've even had the headers ceramic coated to help with some of the heating problem. But its still getting so hot that the spark plug wires and air intake tube are VERY hot to the touch after idling for about ten minutes. The driver side of the car is fine, (normal temp). I am unable to think of anything else it could possibly be and need some advice. I have run a cylinder balance test and everything was fine there. I didnt recieve a error code during that at all. I have spoke with the company I purchased the motor from and now they are suggesting I go through and re-adjust the roller rockers. Does anyone have any new suggestions?

Thanks....

 

[90mustangGT]

Very very hot cylinder can be cause by a bad head gasket as well. Usually what causes a cylinder to get really hot is the lack of fuel. Check resistance between the terminals on the injectors and compare to the other injectors, if all is good try switching injectors. Kind of a long shot but try swapping injectors from one cylinder to the other and see if you get the same result in that cylinder or the other. If the other cylinder starts doing this, replace the injector. If the same issue is on the same injector be sure the injector has good ground and is getting proper signal, if not check the wiring connections by doing a voltage drop test from the injector to the terminal on the computer. You may also try to do a leakdown and compression test and test for HC's in the coolant if you have the equipment.

 

[vikingpower]

yup, gotta be a fuel problem, check the wiring harness for the injector to start