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52 Posts
I purchased a 10th ae 280zx about 6 months ago. Body was perfect, interior was major rough (nevada car), engine was obviously not cared for the way it should have been, but ran good none the less. Since then I have painted & lowered the car, along with redoing about 70% of the interior. Now I am starting to dive into the engine. Here is the problem, I believe the car is running way too rich. Here is a list of the symptoms:
1. Bad mileage
2. Dry carbon flakes on the spark plugs. Lots of carbon. Carbon, carbon
3. Dirty smoke when I step on it over 3000RPM
4. Hard to start no matter when (about 5 cranks)
5. Dieseling
6. Very pungent exhaust. Makes your eyes water.
Once started the car idles relatively smooth. It seems to have decent power, but not like my 81 z I had. There is no hesitation and power keeps climbing.
Now, here is what I have done so far.
1. Cleaned all fi connections
2. Clamped off cold start injector to see if it still ran rich......Yep.
3. New Distributer
4. New coil
5. Compression Test 135 ft/lbs +- 10
6. Tested Fuel Pressure
7. New Fuel Pressure Regulator
8. New injectors
9. Tested plug wires
10. Tested temperature sensors (within range) OK
11. Tested AFM (within range) OK appears to be functioning properly
12. New Battery
13. Changed oil and filter
I know that something is wrong, I am just having trouble finding it. Any help would be appreciated. It seems like it is something major wrong which should be easy to find right?
1. Bad mileage
2. Dry carbon flakes on the spark plugs. Lots of carbon. Carbon, carbon
3. Dirty smoke when I step on it over 3000RPM
4. Hard to start no matter when (about 5 cranks)
5. Dieseling
6. Very pungent exhaust. Makes your eyes water.
Once started the car idles relatively smooth. It seems to have decent power, but not like my 81 z I had. There is no hesitation and power keeps climbing.
Now, here is what I have done so far.
1. Cleaned all fi connections
2. Clamped off cold start injector to see if it still ran rich......Yep.
3. New Distributer
4. New coil
5. Compression Test 135 ft/lbs +- 10
6. Tested Fuel Pressure
7. New Fuel Pressure Regulator
8. New injectors
9. Tested plug wires
10. Tested temperature sensors (within range) OK
11. Tested AFM (within range) OK appears to be functioning properly
12. New Battery
13. Changed oil and filter
I know that something is wrong, I am just having trouble finding it. Any help would be appreciated. It seems like it is something major wrong which should be easy to find right?