M20 will not rev past 3,000rpm

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Re: M20 will not rev past 3,000rpm

Postby Yoshi » Sat Apr 12, 2014 10:23 pm

Can you try with the stock ECU? seems like your car was made to run on a shit FPR so it just flooded.
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Re: M20 will not rev past 3,000rpm

Postby M20_fever » Sun Apr 13, 2014 3:21 am

Can you post your spark and fuel settings? Whats your trigger wheel setting? 60-2?
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Re: M20 will not rev past 3,000rpm

Postby ivprodigy » Tue Apr 15, 2014 12:33 am

Sorry Yoshi, I don't have a stock ecu (never got one from the po).
I didn't really adjust the afpr. Based on whodwho's post my 19lbs mustang injectors require 39psi so I'll have to do that next.
It started snowing again so its too cold to work in the garage...
Tony, I'm attaching screen grabs of my settings. Does anything stand out as being out of whack?

https://www.dropbox.com/s/ueb3ynp3rvk8owt/2014-03-31_18.14.29.msq

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Re: M20 will not rev past 3,000rpm

Postby M20_fever » Tue Apr 15, 2014 3:06 am

Your tooth #1 angle should be 84. Other than that your settings look fine to me.
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Re: M20 will not rev past 3,000rpm

Postby ivprodigy » Tue Apr 15, 2014 4:19 am

Fair point.

The DIYAutotune site has it at 88 but then again I saw a post from Yoshi on e30tech that says its 84...

I'll give it a shot, how bad could it be...

Hopefully tomorrow is warmer, at least enough that I try it out.
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Re: M20 will not rev past 3,000rpm

Postby M20_fever » Tue Apr 15, 2014 1:49 pm

30's today....supposed to be 50's tomorrow and 60's by the weekend. I remember a couple years ago it was snowing during the spring drivers school, lol.
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Re: M20 will not rev past 3,000rpm

Postby Yoshi » Wed Apr 16, 2014 10:28 pm

yep def 84.
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Re: M20 will not rev past 3,000rpm

Postby ivprodigy » Fri Apr 18, 2014 3:12 am

So I was able to get to the car and nothing's changed.
The new fr is in and it's acting much the same as before.
It's running super rich and rough at first. When I apply the gas (even slowly) she just floods and dies and then won't start at all...
I'm at a loss. Am I forgetting something? I've been known to forget to do simple things before.
Would there be something obvious or minute that I could have (unwittingly) changed that could result in this engine just getting bogged down with fuel?

My next thought is to take it to my mechanic but the poor guy is not crazy about working with things that have a standalone (he's not a performance shop).

Thanks
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Re: M20 will not rev past 3,000rpm

Postby Yoshi » Fri Apr 18, 2014 11:06 am

I'd have to see it in person. I think your tune is wrong. or the installation of the ecu is wrong. Try emailing DIY?
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Re: M20 will not rev past 3,000rpm

Postby M20_fever » Fri Apr 18, 2014 1:43 pm

I wouldn't take it to a mechanic. Have you tested the usual sensors like your tps, cts, map? Where are you pulling map from on the manifold? Are you running wasted spark or single coil?
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Re: M20 will not rev past 3,000rpm

Postby ivprodigy » Fri Apr 18, 2014 11:21 pm

Well, this drunk post seems pretty coherent even though I only have a vague recollection of actually typing it...
I was working on getting the turning signals to work and its the one small success I've had in a while.
I checked the TPS (its from and M50) but it functions as it should. The map is fed from the intake manifold and its also connected to the afpr via T fitting. I've tried disconnecting the afpr and capping the tube and there was no change.
The CPS is in place (I had taken it off and re-tightened it a few days back.
I'm not running wasted spark (maybe some day down the line) so the coil seems to be ok. My RPM gauge is directly hooked up to it and its registering just fine.
I'll talk to Matt at DIY. The way the box for the MS unit is setup, it leaves little room for the jumper wires to tuck in nicely under it when the two boards slide in together. The jumper wires are scrunched up together so I'm thinking maybe something is shorting out there (though i feel it may be a stretch).
In any case I'll look for an OEM fpr to replace the ebay one though I can't imagine it making a difference...
Could it be an injector that's leaking?
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Re: M20 will not rev past 3,000rpm

Postby ivprodigy » Thu Apr 24, 2014 9:43 pm

So I checked the oil last weekend and discovered that it was mixed with fuel.
This may be related to the floodings but it also enforced my growing suspicion that the injectors are leaking.
I've drained the oil and am trying to get the fuel rail off but I can't reach the four bolts keeping the rail in place. I've taken the valve cover off for better access but no success.
I'm thinking of taking out the whole intake manifold.
Do you guys have any suggestions on a easier way to do this??
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Re: M20 will not rev past 3,000rpm

Postby 87e30 » Thu Apr 24, 2014 10:13 pm

I wish I could remember how I changed my fuel rail. I've had people tell me you can't take it out without removing the intake, but I definitely never removed the intake. I know that's not a big help, but I do know you can do it without removing the intake.
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Re: M20 will not rev past 3,000rpm

Postby M20_fever » Fri Apr 25, 2014 3:24 am

I've always removed the intake.
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Re: M20 will not rev past 3,000rpm

Postby Ryki » Fri Apr 25, 2014 7:10 am

Removing the intake is by far the easiest way to do it. I've tried wiggling around and avoiding it and certainly have found ways to get around most stuff but this I just went straight to removing the manifold.

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