Cliffnotes:

- Used to have problem running lean when car was hot, thought it was injectors at the time.
- Switched injectors
- Was running on the track, car backfired, electronics restarted, car continued to run like nothing happened.
- On my drive home I got into the throttle and the car fell on its face.
- Ran car for another month or so, car falling on its face happened intermittently but usually on hotter days.
- Over time problem happened quicker and more frequently when it did. Now I can't even drive around the block.


I have replaced the fuel pump, fuel filter, inspected fuelpressure, everything seems good.

A friend of mine pointed me to a thread about overheating injector drivers and now I am suspecting that that was my 'lean injectors' problem and something with it blew up on the track.

Sooooooo

I took apart the haltech and noticed that there seems to be one blown solder joint. 'LINK2' The DMM shows that there is no connection across it but I want someone to check their PS1000 and verify that there should be a connection across it.

The link is on the back side of the PCB where the two wiring loom connections are soldered on the board. There are two LINK spots, 1 and 2. There is a connection across LINK1.

Sorry for the blurry pics. Cell phone. I can take some higher quality ones if someone needs them for reference.

 

Have you contacted Haltech about this?

 

Nope.

 

this is very common.
Have seen a lot of ps1000's do this. They are initially very resistant to take ecu and fix it under warranty.
Haltech australia, very poor customer service.

 

Could you please post more details about your setup, specifically the number of injectors, their impedance and how you have them wired?

After a discussion with Eric at Haltech in regard to my mixed set of injectors (20B Cosmo Primaries & S4T2 Tan Top Secondaries), here is my understanding about the injector drivers:
You can use two Low Impedance injectors (GSL-SE or Early S4 such as Tan Top ones minus their resistor box) on a single output and the Haltech will behave just fine. Give it two High Impedance injectors (Late S4 Purple Tops or above) and it pulls too much current through the injector driver. This has to do with Ohm's Law and Watt's Law in electronics. It's been awhile since I looked, but I believe that ECU Manager divides them into 3 groups; 4-8 ohms (Low Impedance), 9-12 ohms (Medium Impedance) and 13-16 ohms (High Impedance).

At the same time, a mixed set such as High Impedance primaries and Low Impedance secondaries will behave just fine if you tell the ECU they're all High Impedance. This is with no resistors wired in either. Best way I can describe it would be that you have someone that is used to lifting 150lbs all day (aka the Primaries) and when the secondaries kick on, he's only lifting 75lbs. Less load in this case is a good thing.

First thing I would do is measure the impedance of each injector across its terminals and note the number of injectors per signal wire from the ECU. If your harness and build was done by someone else, this is extremely important. as incompetence can often be glossed over by a purring engine. Logging your findings would be a smart move too.

Next, check your wiring between injectors and ECU by doing a continuity test. You want to make certain that there is no funkiness that is introducing additional impedance/resistance. Good wiring should show up as ~0.06 ohms. Anything considerably higher is suspect. Write down which ones show up as bad.

If you have found two High Impedance injectors on one channel, it is a build error and would not be covered under warranty. Same thing goes with poorly done wiring. However, Haltech's service has been quite good from the calls and emails I've exchanged with them over the past few years in regard to my PS 2000. If it was a build error, sincerely not your fault and the responsibly party has bailed on you, I believe Haltech would try to work with you to get you going again as inexpensively as reasonably possible.

 

i think this is backwards?

12v/15 ohms resistance = .8 amps

12v/3 ohms resistance = 4 amps

 

I'm not so sure about that. The greater the resistance, the greater the current draw to overcome said resistance as illustrated by Aaron Cake in the Grounds FAQ here:

Let's assume that the injectors have a normal voltage drop of 2v (they'll trigger on 10v) and require 0.5 amps to operate.
V= IR
4 ohms x 0.5 amps = 2v dissipated (10v left to make the circuit work)
8 ohms x 0.5 amps = 4v dissipated (8v left to make the circuit work)

Double the resistance and the voltage drop doubles as well. In this case, the extra juice was dissipated as heat at the weakest link: inside the ECU at the aforementioned solder joint

Another manner of approaching it would be as R= V / I since we know the resistance figures and voltage.
8 ohms = 12v / 1.5 amps available for injectors
16 ohm = 12v / 0.75 amps available for injectors

As the current draw of the injectors is reasonably known, one of two things will happen: insufficient current available will means that the injectors would 'jitter' (open, then close quickly because the voltage dropped off due to lack of current). Jitter would translate into running lean as the injectors can't put enough fuel into the engine.

Another example of such jittering behavior is from when I was making a boot harness for my PS2K. As the power supply I was using couldn't deliver enough current to power the relays in the Flying Lead harness, it wouldn't connect to the laptop as it should. All it did was make the relays click on, then off, then on and so on. Reduced the load (removed all but one relay) and it finally would connect, reading 7 volts.

When circuits heat up, resistance increases as well, exacerbating the problem.

The other case that would happen is that they would draw their normal current, and operate untill the weakest link in the circuit failed. For this matter, it would be inside the ECU at the injector driver again. Using my previous example again, had I continued to use an insufficient power supply, it would have burnt out as well due to being overworked in the same manner.

 

**** just went off the tracks. J9 is correct. Math doesn't lie.

 

Twinkle twinkle little star V is equal to I R.


As it turns out my 1-bar map sensor blew up and that was causing the problem. In interest of details my setup is 2x1000cc, EV-14s run as high impedance.

 

Are you running in VE mode since you're only running two injectors?

 

No, its running Injection Time. I have never played with VE tuning...not to say I am all that great at tuning in general.