73 2.0 djet idle problem Options

[jasons]

Car is a 73 2.0, new TPS, new FI Points, new TS1, existing TS2 (its the 017), all intake runners, hoses, gaskets, and PCV are new, injectors were cleaned and serviced by witchhunter. Also all parts are correct for the 73 2.0. I put a 270ohm resistor in too. Car seems to run lean at idle (I have an air fuel meter).

I had the wrong TS2, because I replaced it with what I thought was the correct replacement. Upon further review, I put the used 017 piece back in.

The car had been sitting when I bought it, so I dropped the motor to take care of a few problems, and I refurbed the FI while I was at it.

Car seems to have good power and pull hard, but it doesn't seem to idle quite right. It oscillates between, 1000 and less than 500, while the air meter reads lean. Air bleed and the knob both effect idle, but I can't get it to stabilize or richen up on the meter.

Also, I have a euro-race header and MSD. Should I play with the resistor or the FPR to richen the car for these parts?

[pbanders]

We've been through this drill about a million times, but we gotta do it again...

Many of the problems associated with the FI system are often the result of some other underlying condition. Before you do anything on the FI system, you have to make sure that:

1. The engine is in good mechanical condition - proper compression, proper valve adjustment, good intake manifold vacuum, no vacuum leaks, hoses plumbed properly, no vacuum leaks, all systems in place (e.g. PCV valve system in place and valve working properly)
2. The electrical system is in good condition - battery at proper voltage (at least 12.75V for a fully-charged battery with the engine off), charging system in good condition (13.6V to 14.0 V when idling). All grounds in good condition, and full charging system in proper order - voltage regulator, alternator, battery, and cables. EXAMPLE - I'm fighting an idle stability problem with my car right now that I have traced to a bad alternator, that produces an oscillating idle when I have the lights on - looks just like a lean condition instability.
3. Fuel supply and pressure are good - must provide the proper output and be dead-on the factory pressure of 2.0 bar
4. Ignition system in proper working order - plugs, wires, coil, cap, rotor all new or flawless, plugs properly gapped, timing and dwell spot-on, dizzy mechanical advance in proper working order, points plate moving smoothly, vacuum retard cell operating (essential for proper idle operation), vacuum advance cell operating (if on a '73 TB, otherwise, plug it). If you have Crane/MSD/Pertronix, set up according to the manual.
5. FI system bits all the right part numbers and working properly - check my web page for info. TPS properly adjusted so that the idle switch is actuated when you close the throttle, throttle stop set so that you get a full 20 clicks when you open the throttle, MPS in good shape - either properly calibrated by someone on the list with the tools and know-how, or an OEM unit that hasn't been tampered with (or a rebuilt that's been checked out). Pull the ECU plug and check all the parameters at the plug with a DMM (procedure described on my web page).
6. FI idle mixture set to spec - on most D-Jet 1.7 or 2.0 L motors, this means setting it to 3.0 %. To do this properly requires a shop-quality air/fuel gauge, an IR-dispersive one at a minimum, or a 5-gas analyzer. You should be able to get a local shop to do this for you for cheap, it takes a few minutes - make certain the car is FULLY WARMED UP when you do this (i.e. run for at least 30 minutes prior to the measurement). Once the mixture is set, set the idle to 950 rpm with the bleed screw.

If you still have a problem at this point, then the troubleshooting can begin.