Has to be more power in the car if the A/F ratio was right. And now that I know it is running this rich that has to be fixed. The Turbo Tweak chips are known to be among the best for these cars. It went from running great to what it currently is with the old injectors and old chip. It used to idle smooth as glass with an old technology chip - so I know there is something wrong with it. The idle is not horrible I am just weird like that I guess. Yes, the chip runs in open loop by design.
#Scanmaster for buick grand national install#
If anyone wants to install the app I have log files. But the Power Logger application needs to be installed on a computer. I added a turbo buick specific scan tool called Power Logger which adds much more information including time lapse logging. I have both and will likely change them this weekend. Crank sensor is original and fuel pump was changed in 98'. The only parts I have not changed on this car are the crank sensor and fuel pump. I took out all 6 and they all look the same.
#Scanmaster for buick grand national code#
Never throws a code other than when I unplug the cam sensor.Īttached pics of one spark plug. Have an aftermarket ignition system designed just for these cars that has built in diagnostics to tell you if you are having crank or cam sensor issues. I was reading that you can tell something about what the engine is doing by the smell of the exhaust but can't remember what it was? Maybe if it is burned or unburned gas? Wife has been complaining when I go back in the house after working on it because I smell like gas. So the car is running rich and the computer is pulling fuel out. At idle INT stays on 128 and BLM for the most part stays on 121. When you unplug the cam sensor the car is supposed to throw a code but run in batch fire mode and have no visible change in idle.ĭid the screwdriver check for the injectors - never heard one drop out.Ĭhip is designed to run in open loop at idle. With the car running if I unplug the cam sensor the car runs rougher and obviously throws a code. Ran a shop vac in blow mode into the tailpipe and verified no pre O2 exhaust leaks. Replaced fuel injectors as well with new ones with the correct matching chip. Confident there is no change in idle quality with the cam and head swap - no worse no better. Car has more power but still has the exact same miss issue. Cam is a Comp Cam 206 206 which is mostly stock except for a bump in the upper mid range. The hydraulic cam was beginning to wear out so I hired a shop that specializes in these cars to replace the cam with a roller cam and put in aluminum ported heads as well, hoping it was a valve train issue. Have swapped every single bolt on part, except the crank sensor, from the TTA one at a time with no improvement in the GN or degradation in the TTA. Also have an 1989 Turbo Trans Am that has the exact same engine that runs %100 perfect. Engine speeds up and down randomly 800 - 875 rpm and coincides with the miss.
Does not appear to have it when cold or off idle. 1987 GN that has had a persistent random idle miss when warm.
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