I have a freshly rebuilt 1986 22RE and I'm having problems with it running smoothly. It only has about 140 miles on it, so it is still breaking in. There are no air, coolant, or oil leaks.

The main problem is it is misfiring across the RPM range. I can't get it timed spot on. It seems like a fuel and air mixture issue. I bought a new Beck Arnley TPS and adjusted it based off of 4Crawler and Hane's Manual. It is running better, but when timing it the white mark is still jumping between 5-6 and after every a few rotations the white mark won't pop up at all and then go back to jumping between 5-6.

I initially broke the engine in with valves at .007 & .011 cold and then readjusted the valves are set to .008 & .012 hot like the FSM and Hane's says to. It seemed to run better at .007 & .011 cold. I have a bigger camshaft and I have heard rumors about setting the valves tighter when running a bigger camshaft. Can anyone confirm?

Also, does anyone have a guide on how to adjust the IAC? Mine is out of adjustment. I'm sure mine is good because it used to work before I took it apart to clean it, but if it came to it where could I find a new one?

What gap should I set my spark plugs to? I know what the FSM says, but I wonder if anyone has had better luck running a different spec.

Any other tuning suggestions would be appreciated.

Rebuild Specs (All New)
- Bored .020 Over
- DNJ Master Rebuild Kit
- DNJ Head
- Oversized Valves
- EPN (EngnBldr) 268 Camshaft
- Rebuilt Stock 1986 Toyota Injectors
- EGR Block Off
- Aisin Water Pump
- Aisin Oil Pump
- Maxx Red Spark Plug Wires
- DNJ Timing Cover
- Steel Timing Chain Set
- Fel-Pro Oil Pan Gasket
- Airtex Wells Cap & Rotor
- Denso Spark Plugs
- Denso Oxygen Sensor
- 4 Seasons Fan Clutch
- Dorman Harmonic Balancer
- FRAM Fuel Filter
- NAPA Gold Oil Filter
- Beck Arnley PCV & Gasket
- Stant 195 Thermostat
- Anchor Engine Mounts
- Proform GM 1 Wire Alternator
- Beck Arnley Throttle Position Sensor
- LCE Vacuum Hoses
- Goodyear/Continental Coolant and Air Lines
- Macs 3 Core Brass Copper Radiator
- Optima Yellow Top Battery
- Heavy Gauge Battery Wires and Grounds
- LCE Fuel Pressure Gauge

Things I have not replaced that might be an issue:
- Fuel Lines
- Exhaust Manifold (I have a long tube header waiting to go on)
- Coolant Sensor
- Cold Start Sensor
- Fuel Pressure Regulator (fuel pressure looks in spec though)
- Fuel Pressure Dampener
- AFM
- IAC

 

Misfire across all rpm range indicates bad spark or fuel. Depends on how random and if its on one cylinder or multiple.

Did you gap your distributor? Set timing with jumper/ground in the terminal?