hrspwrjunkie

Member
Dec 15, 2004
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www.classicsandperformance.com
Sorry for the late response,
I recently put in 30 lb injectors in and sent my MAFback to PRO M to be recalibrated as it was previously calibrated for 42#, but the troubling part is it still runs like sh*t. Weirdly enough I am able to keep the car running (blowing plumes of white smoke) when I disconnected the MAF and take off the filter (I'm running a MAF where it is mounted on the filter), and when my air filter and MAF are installed the car won't even fire when turned over, I'm thinking that it's running so rich that the little amount of air restriction the filter provides is the choking the engine off totally.

I am now looking into to see if I have ECM damage because I get the code 511 (Read-only Memory) from when I put my diagnostic scanner on it.

Running down the code first is the right call. Sounds like your ECM may be toast. If that isn't it, you'll need to trace the system to find something causing the code such as an issue in the wiring. Once you get that sorted, you can move forward with any other needed repairs.

"Plumes of white smoke" is a little disconcerting. Based on the fact that you mentioned running poorly, you could have a blown head gasket or a leak between a coolant crossover passage and an intake port. I'm not saying that's the problem, the white smoke could just be condensation in the system, but it is also an indicator of an internal coolant leak. You'll have a better clue if you can resolve the code and get it to run with proper engine management.
 
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jozsefsz

Mustang Master
Aug 11, 2013
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Sorry but the reply above is not correct in any respect. A 511 is a standard error code when you have a piggy-back chip installed. Your computer is not toast.
If you've had your MAF calibrated to your injectors, you need to remove your piggy-back chip with the questionable tune on it. Otherwise, the tune needs to be corrected to the new MAF curve. If you have a 511 after removing the chip, then you may have a problem.

The plumes of white smoke are most likely an extremely rich condition, likely nothing to do with the head gasket. That's a common failure, but as you mention it's running pig-rich, that's just raw fuel coming out of the tail-pipe. Especially if it smells like raw fuel and makes your eyes water.

Step 1 - remove piggy-back chip if you haven't already and give things a try.

Step 2 - you may have a stuck-open fuel injector. your tuner may have been oblivious to this (they often aren't good with mechanical problems). check your fuel pressure. if it goes to zero quickly after shutting off the car, you may have one that is stuck and is dumping all of the fuel into a single piston (leaving other cylinders lean and barely running). Your symptoms are identical to mine when I had that happen. This type of mechanical failure cannot be corrected with a tune. If you are running 'Bosch Green Giants' especially if sourced from eBay, be very very skeptical and assume this is your problem.

- If you suspect this is true based on fuel injector brand and / or fuel pressure readings, replace injectors with a good set.
- Change your oil because it's now filled with fuel and will wreck your engine.

Step 3 - if you have verifiably corrected the fuel injector situation in step 2 (don't try and skip that step), installing an adjustable fuel pressure regulator gives you some level of control over fueling. My calibrated Pro-M was calibrated too rich by the factory. Turning down fuel pressure a pound or two allowed the computer to get into the range where it could comfortably adjust fueling.
 
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elio3848

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Jan 5, 2020
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Sorry but the reply above is not correct in any respect. A 511 is a standard error code when you have a piggy-back chip installed. Your computer is not toast.
If you've had your MAF calibrated to your injectors, you need to remove your piggy-back chip with the questionable tune on it. Otherwise, the tune needs to be corrected to the new MAF curve. If you have a 511 after removing the chip, then you may have a problem.

The plumes of white smoke are most likely an extremely rich condition, likely nothing to do with the head gasket. That's a common failure, but as you mention it's running pig-rich, that's just raw fuel coming out of the tail-pipe. Especially if it smells like raw fuel and makes your eyes water.

Step 1 - remove piggy-back chip if you haven't already and give things a try.

Step 2 - you may have a stuck-open fuel injector. your tuner may have been oblivious to this (they often aren't good with mechanical problems). check your fuel pressure. if it goes to zero quickly after shutting off the car, you may have one that is stuck and is dumping all of the fuel into a single piston (leaving other cylinders lean and barely running). Your symptoms are identical to mine when I had that happen. This type of mechanical failure cannot be corrected with a tune. If you are running 'Bosch Green Giants' especially if sourced from eBay, be very very skeptical and assume this is your problem.

- If you suspect this is true based on fuel injector brand and / or fuel pressure readings, replace injectors with a good set.
- Change your oil because it's now filled with fuel and will wreck your engine.

Step 3 - if you have verifiably corrected the fuel injector situation in step 2 (don't try and skip that step), installing an adjustable fuel pressure regulator gives you some level of control over fueling. My calibrated Pro-M was calibrated too rich by the factory. Turning down fuel pressure a pound or two allowed the computer to get into the range where it could comfortably adjust fueling.

When I remove the chip I just get the codes stating the car is running rich lol. The ecm isn’t damaged the car is running exactly how it should be with a stock ecm and big cam.

I have recently replaced the injectors (upgraded from 19# to 30#) and the car runs a little better but still super rich. Plus the car holds fuel pressure.

The car already came with a adjuster fuel pressure regulated and I set it to 37-40 psi.
 

jozsefsz

Mustang Master
Aug 11, 2013
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Cleveland OH Area
"Turning down fuel pressure a pound or two allowed the computer to get into the range where it could comfortably adjust fueling." That's what I'd do next.