computer problems
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Senior User
Joined: Apr 2004
Posts: 368
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From: NH
computer problems
I have a 1986 mercury capri with a pretty well decked out 347 stroker. the kid i bought it from sank about 10g's into the motor and couldn't get it to run right. right now i know the injectors are 24lb/ah injectors and the maf sensor is calibrated for them( yeah by the way it's ben converted to maf and is running on a 93 gt computer.) but it seams like it's still getting to much fuel. we have ben running the fuel pressure at 30 psi.it also has a full msd ignition and the battery has been moved to the trunk. am i going to need a programable computer and ifso who makes a good one? every thing in the car now is top notch parts and i don't want to skimp out now or i'll end up paying for it later. 
Post Fiend
Joined: Jan 1997
Posts: 23,165
Likes: 18
From: Enjoying the real world.
The MAF isn't calibrated! 
If it was, the A/F ratio would be correct.
The first thing to do is take it to a dyno shop for a wide band O2 sensor graph. Custom tuning would need to be based on that. With the graph, the fuel maps can be corrected with a custom tuned chip.
Or, you can buy a wide band O2 sensor and use a Tweecer to tune yourself, but look at spending some time doing that!
If it was, the A/F ratio would be correct. The first thing to do is take it to a dyno shop for a wide band O2 sensor graph. Custom tuning would need to be based on that. With the graph, the fuel maps can be corrected with a custom tuned chip.
Or, you can buy a wide band O2 sensor and use a Tweecer to tune yourself, but look at spending some time doing that!
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Senior User
Joined: Apr 2004
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From: NH
maf sensor
the kid i got the car from ordered the maf sensor from pro-M.i contacted pro-M and they actualy told me that the injectors were one size to small and that the maf sensor was also to small.they also said that because the air filter is mounted to the end of the maf sensor it may not be getting the proper readings.is that true or is that some thing they're telling me so i buy more parts?the reason i asked if it should should have a programable computer is because i wouldn't think that the factory one would be able to run this motor.the motor has a .588 lift cam in it and with the pistons in it the comp. is up around 12 to 1.
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Senior User
Joined: Apr 2004
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From: NH
plenty of time
just to let you know i have plenty of time to figure this out.i can see(from reading another thread)how bussy you are ken.also tell your employee that all of us from my comany send our condolences and hopes of a brighter future.i myself am in full swing and won't have time to get to the car very soon.i don't think the computer and the maf sensor are the only problems i have.if you could call me our i could call you i could better explain this problem then you could tell me if you can help me or direct me to some one who can.(when you have a minute to breath)what would be the best way? like i said i have plenty of time and in no rush.i'll probably pick up all the parts i need this summer and put it together this winter.
Post Fiend
Joined: Jan 1997
Posts: 23,165
Likes: 18
From: Enjoying the real world.
Thanks, I'll relay the message.
The honest truth is the majority of the younger guys with Mustangs I come in contact with know very little about their vehicles and slap things on, throwing money at them, because their buddy told them it would work, without really investigating them. Its not unusual for me to get 1 or 2 calls each day where every 4th sentence is "uh, would that help the power?"
I'll be happy to discuss the vehicle with you, but I've officially dropped EEC-4 custom tuning. I'm spending 10x more time on 1 EEC-4 custom than I do with 1 EEC-5 custom and its getting to the point where my time is stretched beyond the point for me to manage everything.
The thing to do is get a larger MAF, but you'll need to do dyno time with a wide band O2 sensor because the vast majority of larger aftermarket MAFs are calibrated for stock tuning. Once you get that done, post the chart here.
The honest truth is the majority of the younger guys with Mustangs I come in contact with know very little about their vehicles and slap things on, throwing money at them, because their buddy told them it would work, without really investigating them. Its not unusual for me to get 1 or 2 calls each day where every 4th sentence is "uh, would that help the power?"
I'll be happy to discuss the vehicle with you, but I've officially dropped EEC-4 custom tuning. I'm spending 10x more time on 1 EEC-4 custom than I do with 1 EEC-5 custom and its getting to the point where my time is stretched beyond the point for me to manage everything.
The thing to do is get a larger MAF, but you'll need to do dyno time with a wide band O2 sensor because the vast majority of larger aftermarket MAFs are calibrated for stock tuning. Once you get that done, post the chart here.
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Senior User
Joined: Apr 2004
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From: NH
computer problems
thanks alot ken. one last question are the pro-m maf sensors any good or do you recomend some one else. thanks for all the info it's giving me a direction to start heading. it seams like every one i talk to doesn't know where i should start or can't give me a possible direction to go but you guys have been awsome. thank you again ken and good luck.
