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dkahler · dkahler's Garage

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<div style="font-style:italic">Hello Everyone, 
 
I have posted before but not for a while. I have a 86’ 951. I love the car and have it almost exactly the way I want it. It is almost set up stock. The purpose of the car is to be a track car. The car is experiencing two issues. 
 
The first issue is that the car seems to be running very rich. I park the car in the same place and it has left a very prominent black spray of exhaust on the floor about 2 feet long. This is what is leading me to believe that the car is running rich. 
 
The second issue is when WOT in 3rd gear around 5000rpm or 4th at around 5000rpm the car will seem like it retards the timing, resulting in a drastic loss of power. Stepping on the accelerator results in bucking and stuttering. If given minimal gas to maintain speed, after about 8 - 10 seconds power is restored. A few times after this experience, the car will die at a stop. It will instantly start back up and drive normally. I have tested with boost limited between 5 psi - 15psi and the issue happens regardless of the boost level. 
 
Both of these issues have been occurring for over 6 months now. I have read every thread I could find on how to resolve these issues. Here is a list of what I have replaced and tested in the vehicle. 
 
New Universal O2 sensor (Car does NOT have a catalytic converter) 
DME Temp sensor (Tested against Clarks garage specs) tested OK. 
AFM (Tested against Clarks garage specs) tested OK. 
New TPS sensor 
New Spark Plugs changed in “July 12” 
New Spark plug wires 
New Distributor 
New Rotor 
New Coil 
New Knock Sensor 
New Engine Mounts 
New Fuel Pressure Regulator 2.5 
New Speed sensor 
New Reference sensor 
New (Remanufactured) DME with a stock chip 
New (Remanufactured) KLR with a stock chip 
New Timing belts 
New (Remanufactured) Idle stability valve 
New Fuel filter 
New vacuum hoses 
I have bypassed Cycle Valve 
Added Manual Boost Controller 
Stock wastegate (Tested against Clarks garage specs) OK 
Added aftermarket boost gauge 
 
I have installed the LED blink code tester and there are never any codes. 
 
I feel that I have tried everything listed on the Internet to resolve the issues. Any help or insight that you might have would be greatly appreciated. I am literally out of ideas and very frustrated. 
 
Thanks</div>
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Ok if you have no cat the soot is normal. Now the power loss it could be two things overboost or car running lean and klr retards time. It shouldn't shut off. I see you have an aftermarket boost gauge which is good but you should add a Wide band o2 sensor to see if the car goes lean at that rpm. GLuck

Thanks for the post. If I am running lean what would I do to correct that?

Thanks DK