| Re: new vette owner, NEED HELP |
Subject: Re: new vette owner, NEED HELP by bogus on 2008/5/24 17:48:26 coils don't fail from sitting, but they could cause a car to sit.  the HEI coil is pretty reliable... I would expect it to take more heat to fail than 4 or 5 minutes of run time. If you suspect the coil, check how warm it is when the engine starts to run poorly, then spray it with some cool spray. If everything gets better, fast, then you have found the problem. I would think that the pressure drop off could easily be caused by a bad check valve, but the black smoke tells me otherwise. I am with the group that the injectors are bunged up. Besides, a bad checkvalve won't compromise performance in this manner. Think about it, the car has sat for 6 years. Whatever fuel was in the lines has now totally laquered up. I would say that is the problem. If you want to try a cleaner, B&G makes this stuff called 44K. I have seen it do wonders for bad injectors. Pour some into the tank, I would actually add about 2 cans to one tank... a little extra won't hurt in this case. Here is the overall reasoning: GM does not recommend cleaners for injectors. They say it damages the exposed to fuel electronics inside the injector (the fuel provides cooling). If the fuel cleaner works, it might also damage the injector, but you will now know. The other side of this coin is that no one (that I know of) will touch the Multec injectors! A real easy test, but it requires disassembly, is to remove the injector rails and then turn on the key! It will take some help, but you remove the fuel rails and then put paper cups under each injector. Have someone cycle the crank and watch what the injectors are doing. If you see fuel spewing, there is your problem. I recommend Ford Motorsports (FMS) injectors. They are a Bosch style and work very well. I would think the Pink Tops would be best for your vintage L98. Avoid Accel like the plague. |
