2G The real MFI relay IDENTIFY please!

[95Eclipse]

I'm having some issues with my injectors not firing in random cylinders in different occasions and want to replace my MFI Relay to see if that's the problem...

Can Someone clear up which is really the MFI relay in a 95 TSI AWD Talon? I'm sure someone else can be having this problem as well and will find this as helpful as me.

I 've been reading up on this and one guy said it was the shinny metal box behind the center console right by where the passenger's left foot would be and it's bolted down with 2 10mm bolts.(PIC. #1) and some other guy said it's a black relay located also behind the center console in the space between the stereo and ECU, the one with the Blue plastic end on the connector end. (PIC. #2)

My problem is that my 95 TSI AWD has both of the metioned relays and it would help to know which is which and clear things up. I don't want to replace the wrong one either.

Any info would be great...

PIC #1 can be found here:
http://www.dsmtuners.com/forums/problem-diagnosis/263224-mfi-mpi-relay.html

PIC #2 can be found here:
http://www.dsmtuners.com/forums/problem-diagnosis/160607-identify-mfi-relay-pic.html

 

[luv2rallye]

The 95 has both the MPI and FP relays in the same unit and it has 8 wires on it (may have 8 or 10 pins). The 96-99 has a separate MPI relay with 4 wires on it (and only 4 pins). I don't have a 95 but judging from your pics I'd say it's pic #1. Pic #2 looks like the MPI relay in my 99.

 

[95Eclipse]

Thanks Luv2rallye,
I have oppened mine (the one in pic #1) and it has the two coils in it,but some one mentioned that the black one(PIC#2) was the MFI relay on a 95AWD Talon and it got me confused because my car has both of them
Also,
One guy posted the supposed part numbers for the MFI, but can someone verify these?

MR161519 - Engine Control Relay (If your car was manufactured before July of 05)
MR224160 - Engine Control Relay (If your car was manufactured after July of 05)

Any Help would be much appreciated.
Thanks!

 

[luv2rallye]

The 95 is different than 96-99 in that area. My 99 has the starter and door lock relays also near that area so your black 4 pin one may be one of these. Note the starter relay only activates (clicks) if the clutch pedal is not pressed when starting.

 

[95Eclipse]

I'm going to try to find out if the relays on PIC#2 are for the Starter and Door locks as well If they are than that means that the one on PIC#2 is the MFI on the 95 TSIAWD.
I'll post back with what I find.

 

[95Eclipse]

I did some checking around and I found out that also on my 95 AWD Talon those relays (Pic2) are for the door locks and starter like in the 96-99 so now I'm sure that the MFI and MP relay are the ones on pic2.

I already tested them (MFI-MP) to see if they were activating when power is applied to them and it does open and close, can they still be faulty?

Let me post my problem maybe someone knows what the hell could be wrong with my car.

Before I did my 6 bolt swap the car was hesitating a bit while cruising, I couldn't figure out why, after the swap the car was running "fine" hesitating like before, but it drove ok. Then it just started to misfire really bad and gave me the P0300 code, so I did some checking around and after a while I found out that one of the injectors wasn't "shooting" fuel. I tested it and it didn't have any power to it. I turned the car off and cleared the code and it worked again, later that week the misfiring and the same code, I checked again and this time it was a different injector that had no power and a different injector the next time, but only one at a time.

It happens a lot now, maybe once or twice a day.
When it does the misfire I turn the car off and back on and it works "fine" (hesitating, not misfiring) until it later falls into the same misfire mode. I thought it was the injector resistor pack, but I found out how to test it and it tested ok. Although it might still be bad and only be failing at the time it's causing it to misfire, but I can't test it while engine is running, it has to be unplugged. That led me to believe it could be the MFI-MP relays.

Can anybody think of what might be causing this hesitating and misfiring? I'm pretty sure they're both related to the same problem.
Can the injector resistor pack be causing this every once in a while?

Any help would be much appreciated.
Thanks!

 

[luv2rallye]

Your problem sounds more likely to be a bad CAS.

 

[95Eclipse]

I thought if it was bad it would mess with the coils but not the injectors. I will try to find more info about it. Thanks.

 

[luv2rallye]

The CAS is what tells the ECU when to fire the injectors (as well as the coils). So flakey CAS signals results in flakey injector firing. Of course the ECU may also be the problem but since it's on multiple injectors it sounds more like the CAS.

 

[95Eclipse]

I was looking at a CAS on a 95 Hyundai Sonata's G4CP engine I have and they look Identical, Do you know if they are interchangeable with the 1G CAS. I will try to post a pic.

Here are the pics: it was dark though

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[95Eclipse]

I know it's been a while since I last posted and this here happened, but I thought I should post that I got this hesitation problem fixed doing the POT (Potentiometer) MOD. I never thought this would be the problem because no one else had seen that the P0300 code and the injectors not "firing" (each time it happened it was a diff. injector) were related to the same strange problem. (random misfire)

Anyways I hope that if you are reading this because you are having the same problem as I did and no one told you that when you do a 6 bolt swap and your car starts hesitating and you get the P0300 code (multiple cyl. misfire) maybe one of your injectors isn't "firing" and you need to do the POT MOD.