Methanol Injection = Misfire. Please help me!!!

[GetBoosted84]

I need some help from you guys on my Stage 2 Snow Performance MAF Methanol injection kit. Background... I am running it on a 2001 A4 1.8TQM.

I installed the kit tonight and everything was functioning properly during my tests. I revved the car up and once the RPMs got up to about 3,400 RPM it would start spraying and hit full spray at 4,000 RPM. Then I installed the sprayer into the intake hose and filled it up with 50/50 M1 methanol & distilled water and took it out for a spin.

First run I ran it without spraying just to make sure all was well (I put a switch in for this reason). To my surprise I bogged in first then then it felt fine throughout the gears. Then starting again (still w/out meth) my check engine started flashing and I looked in my logger to see I got a misfire on Cyl 2 & 4.

After that, I brought the car back to the house and checked it out but nothing looks wrong (still gotta check the plugs though). I flipped on the meth just to check and to my surprise while revving the car it will not engage now.

Here is how I set up the wiring to the brain box:

+12v switched ign (Red wire) = 75x pole under dash (leftmost pole)

MAF signal (Yellow wire) = Green shielded wire coming off the MAF sensor. I was told this should be the yellow one but I get absolutely NO signal from that wire at all.

Ground (Black wire) = Chassis bolt

Pump (Green wire) = Red wire coming off the pump (and the pump's black ground wire is grounded to a chassis bolt)

Please help. I don't want to break down on the way to work tomorrow.

[Poopie]

check your wiring again and make sure the connections are solid. Then check your fuses and maf. I have a feeling you blew the maf.

[GetBoosted84]

check your wiring again and make sure the connections are solid. Then check your fuses and maf. I have a feeling you blew the maf.

I am going to wake up early tomorrow before work so I can check my connections & plugs. What do you mean by blew my MAF? You mean toasted like I need to buy a new one?

[AudiRacerS4]

almost positive it's because youre spraying too much meth too early. dont set it by RPM set it to trigger at a certain boost level. if youre spraying at 4000 at 1/4 throttle you will run extremely rich and misfire

[Poopie]

I am going to wake up early tomorrow before work so I can check my connections & plugs. What do you mean by blew my MAF? You mean toasted like I need to buy a new one?

perhaps. Mafs are usually the culprits of misfires. I'll check into the wiring diagram tomorrow. Kevin has my manual

[Poopie]

almost positive it's because youre spraying too much meth too early. dont set it by RPM set it to trigger at a certain boost level. if youre spraying at 4000 at 1/4 throttle you will run extremely rich and misfire

His is set by maf readings. If you are at a high rpm but very little throttle angle you are pulling very few g's from the maf so it won't spray meth.

[AudiRacerS4]

perhaps. Mafs are usually the culprits of misfires. I'll check into the wiring diagram tomorrow. Kevin has my manual

thats true too but i had the exact same problem as him when i was spraying too early

[GetBoosted84]

Ok, I just got in from looking at the car and here are my findings:

All the plugs look ok. There is a slign black spot on 3 of them towards the side though but overall they look to be in good working order.

I think my LED burnt out (wires are all good running to it from the brief look I took) so I cannot tell exactly when the pump is turning on. I am going to replace that today to see if that's what the issue is.

The brain box is getting power from both the MAF (yellow) wire and the +12v Switched Ign (Red) wire. What I did also do was re-set the knobs on the brain box. Before they were a little lower than what I changed them to. Here is what they are set at currently:

Start of Spray (left knob): ~ 2.5v
Full Spray (right knob): ~ 3.0v

For now I have dis-engaged the system just to be safe until I can get this worked out.

What else should I be looking at? Maybe it's something stupid like the spray voltages I set being incorrect.

[Seerlah]

If you need a MAF, I have an extra one from my 01. I replaced mine 2 weeks ago along with my 02 sesnors because I was not liking my gas mileage. It is not shot, but I do not know the full condition of it. I just replaced it because my gas mileage was ~19 mpg. No CEL but I never logged it. I replaced all 3 (both 02 sensors and MAF) to make sure I would get better gas mileage (yes, it worked). But yeah, if you want it it is yours. Just pay for shipping. PM me if you want it.

[GetBoosted84]

If you need a MAF, I have an extra one from my 01. I replaced mine 2 weeks ago along with my 02 sesnors because I was not liking my gas mileage. It is not shot, but I do not know the full condition of it. I just replaced it because my gas mileage was ~19 mpg. No CEL but I never logged it. I replaced all 3 (both 02 sensors and MAF) to make sure I would get better gas mileage (yes, it worked). But yeah, if you want it it is yours. Just pay for shipping. PM me if you want it.

Thank you very much for the offer. Unfortunately I need to run a 3" 225 TT MAF for my k04 application.

[Seerlah]

No problem

[Nebone]

Thank you very much for the offer. Unfortunately I need to run a 3" 225 TT MAF for my k04 application.

Does you MAF use just a TT housing or TT housiong and sensor? You can probably use the sensor and swap in into your larger housing. I have one too if you want, just pay shipping (it didn't get best readings but no misfiring).

[GetBoosted84]

Does you MAF use just a TT housing or TT housiong and sensor? You can probably use the sensor and swap in into your larger housing. I have one too if you want, just pay shipping (it didn't get best readings but no misfiring).

I'm running the 225TT sensor and 3" 225TT housing currently since the Hammer file requires that.

[mtbrider]

I'm running the same system as you and your start and full on voltages are too low. Try a start voltage of 3.0 and full-on at 4.8/5. Also be sure that your aiming the correct thing. I was confused at first but after talking to Snow I figured it out. On my controller there is a little red dot next to one of the "cross-hairs/philips". Originally I was aiming the red dot, however I found out that your supposed to aim the cross-hair that the red-dot is up against (I hope this makes sense).

[GetBoosted84]

I'm running the same system as you and your start and full on voltages are too low. Try a start voltage of 3.0 and full-on at 4.8/5. Also be sure that your aiming the correct thing. I was confused at first but after talking to Snow I figured it out. On my controller there is a little red dot next to one of the "cross-hairs/philips". Originally I was aiming the red dot, however I found out that your supposed to aim the cross-hair that the red-dot is up against (I hope this makes sense).

Oh, that might be my issue. I'll check it at lunch time. I was having the same issue trying to tune this thing. I didn't see the little red dot.

[GetBoosted84]

Ok, I think I jumped to conclusions. After replacing the bulb (which did burn out btw) and changing the start voltage to ~3.0 volts and my full spray voltage to ~4.9 volts I re-ran the car and let it idle and I am seeing zero misfires. In addition, I VAG'd the car and I am seeing no codes and no timing is getting pulled.

I will post up my before and after timing logs once I pull the data in from my laptop.

Thanks again guys for all your help!

[B5Burn]

So she's good now??

B.

[GetBoosted84]

Yeah everything is looking solid now. Actually the car feels stronger when doing a pull in 2nd and 3rd. I'm not sure if it's just me or if it is really pulling harder. It should pull harder yet once I play with the timing a little bit.

[B5Burn]

Fantastic, I had an epic troubleshoot this week also, good stuff! Congrats.

B.

[AudiRacerS4]

Yeah everything is looking solid now. Actually the car feels stronger when doing a pull in 2nd and 3rd. I'm not sure if it's just me or if it is really pulling harder. It should pull harder yet once I play with the timing a little bit.

do you have the stage 2 meth kit? if so why dont you run it off the MAP instead of MAF signal its much easier to tune and tweak that way

[GetBoosted84]

do you have the stage 2 meth kit? if so why dont you run it off the MAP instead of MAF signal its much easier to tune and tweak that way

The MAF setup allows for you to fine tune the meth setup regardless of boost which is what I am looking for. Basically the MAP setup is less precise than the MAF setup.