ECU / INJECTOR ISSUE!!! Any ECU experrts out there?

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Tue, 17 Sep 2013 08:35:45 GMT

If your car is running fine I wouldn't bother about having it fitted back in.
For mine I will have it put back as its not costing any extra at the exhaust shop when they make up that section of pipe.
I'm not in rush to get the exhaust done because I wont be running an event till after November. Just good to have that overfuelling sorted now so the car is all perfect again.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (Blue2)

Mon, 16 Sep 2013 23:30:12 GMT

I also am running no cat or dog in mine. So not sure if tapping the temp sensor would do anything. Tuner never complained about it not being plugged in.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Mon, 16 Sep 2013 15:58:55 GMT

Yeah there is an O2 sensor before the CAT and a Temp sensor after the CAT.
I'm just having the CAT removed as it would be clogged. The exhaust Temp sensor is right, the system is running too hot because of the clogged CAT. I could remove the sensor but no point, as it's doing the right job.
Should mention it's currently a dedicated track car so no need for the CAT.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (Blue2)

Mon, 16 Sep 2013 14:42:48 GMT

Doesn't the exhaust have two sensors? O2 and O2 temp. Currently I am running powerfc and the O2 temp is not connected. Still runs fine but I am not sure about with stock ecu?

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Sun, 08 Sep 2013 11:34:37 GMT

Alright so update on this.
Pulled out the fuel injector. The bottom o ring on injector 1 was completely eaten away so swapped it over.
Changed ignitor modules to the matching number of my original and the rev limit at 6500rpm has been removed so back to being able to rev to 8000 - 9000rpm if I let it.
So the two things that caused all my problems were the ignitor module going bad which causes the car to fuel up massively. The second was a leaky injector from the rubber o ring wearing out. So that's all solved now.

The only issue now though is that the CAT temp light is still coming on after driving for maybe 1minute.
I assume the that maybe the CAT is clogged or ruined because of all the excess fuel? any ideas? I seem to get a few small pops from the exhaust when I lift off the gas if I rev it out. This didn't really happen before. Could it all be related to a blocked CAT or something else?

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Mon, 26 Aug 2013 10:49:27 GMT

Need to pressurise the sensor with the engine not running as I don't want to splice into the wire. I read the voltages from the connector to the ECU. There is a hand pump with a boost gauage attached which makes life easier. Anyway pretty close to all sorted so will swap out the other parts then check fueling. If its still lean after the swap in ignitor modules then will change it out. The ignitor module was causing the rich condition on its way out.....even when I plug that old one back in it makes the car go super rich. So possibly this new is making it go lean. Anyway will find out soon enough, well 4 weeks time when it arrives from the states.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (artymr2)

Mon, 26 Aug 2013 10:05:43 GMT

The gen3 ecu uses the map sensor to work out fuelling etc, if it is broken it won't run correctly.

You don't need a special tool, just tee in a vac/boost gauge and compare output to specs. Correct you would expect the map sensor output to change if sucking/blowing into it.

Cheers

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Mon, 26 Aug 2013 08:15:19 GMT

The leaking injector is a definate and the igniter module is another definate issue. Once I swap those over I'll see how everythings running. If its lean I'll know I need a new map sensor. Just a bit odd that everythings happening all at once. When I plugged the old ignitor module in the car runs very rich before it shuts down. Basically the circuits in it are screwed. The problem with using a syringe or even blowing in the tube is I can't tell how much pressure I'm putting in the tube.....really need a special tool as listed int he BGB for it but regardless I'd expect to see a change in voltage just by blowing in it, so I reckon its faulty too. The igniter module really threw me though as soooo many people have listed it as compatible which it totally isn't. Will just see once I swap in a few of the new parts when they arrive. Not far off being back on the track which is a relief.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (artymr2)

Sun, 25 Aug 2013 21:14:39 GMT

If your map sensor does not change output according to specs with vac/pressure (you can use a syringe to simulate both ) then it is definitely faulty. I would sort that out first as its an obvious issue.

Cheers

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Sun, 25 Aug 2013 14:16:05 GMT

Alright update on all these issues. First off worked out why the car is rev limiting to 6,500rpm or there abouts. Basically there are a lot of people posting rubbish about which igniters are compatible with which cars. Turns out the one I got that a lot of people have listed on forums as being compatible with GEN 3 MR2's isn't right. It will rev limit the car to 6,500rpm. Ordered in a new igniter module, when that comes in hopefully it will solve that issue. The other issue was injector 1 is leaking, so still waiting on a new set of injectors to arrive.
the last possible cause is that the MAP sensor is faulty. It's reading a constant 0.20v even if I blow in the tube as hard as I can. Will see how it all pans out once I fit another new igniter and change the injector. Not far off from being sorted now... " />

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Wed, 21 Aug 2013 08:09:49 GMT

Logicar

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (dasic1)

Tue, 20 Aug 2013 22:18:26 GMT

who is this ecu company?

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Tue, 20 Aug 2013 20:39:51 GMT

Yeah will be the correct MAP sensor, its a factory GEN 3 GTS. Was running perfect till just after the last track event.
I've already checked the TPS and that sensors perfect, so now I have to check fuel pressure and MAP sensor.

The ECU was bench tested, so they run it through all the parameters and its 100% fine. On the bench they can check everything, feed it whatever sensor inputs so its definitely not the ECU. Cost me $132 to have it tested, took them 2hours. They do most of the ECU repairs in the country. They heat it up, cool it down, all fine.

I know injector 1 is dodgy so waiting for another set to arrive so I can start playing again with that sorted.

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (Mrskylighter)

Tue, 20 Aug 2013 17:00:39 GMT

Yep just for closed loop.
Do you have the correct map sensor fitted? Should have a purple coloured sticker if gen3 turbo Mr2.
You still not tried a stock ecu which is known to be good?

Re: ECU / INJECTOR ISSUE!!! Any ECU experrts out there? (track_mr2)

Tue, 20 Aug 2013 08:45:36 GMT

Okay update on this. Gave my ECU off to be tested by one of the biggest ECU places in Melbourne. They just called up saying it is 100% fine. They can not fault it on the test bench its perfect.......
I've checked the TPS they is reading perfect. The only thing left is the MAP sensor to test I think....
The O2 sensor does not control anything at 2000-4000revs or under high load right, its only used for closed loop?