Mass Airflow? Update! June 29, 2012, 07:49:45 AM OK, I have done the HO swap. Now have a Ford Senior Master Tech working on it to get the trans right. TV adjustment not doing much to help odd shifting. Anyhow, its got a lopey idle and black smoke. I kind of feel like this thing has been cammed up. Is a Mass airflow conversion in order? It runs great. Just would like the smoke to go away and I know something is causing it to run rich. Map sensor may be faulty, but could it be lack of MAF? I have not tried to check for codes yet. I want to get the trans and exhaust right first. Quote Selected
Mass Airflow? Update! Reply #1 – June 29, 2012, 10:02:44 AM You can put a dial indicator on the top of one of the intake and exhaust rockers. The lift numbers should tell you if the cam has been changed.Darren Quote Selected
Mass Airflow? Update! Reply #2 – June 29, 2012, 11:20:51 AM If you've got a very hairy cam, and/or bigger injectors, you could very well get the results you have. Give us a little background on the HO swap? What injectors are in the engine? What eec? Any visible mods? Short of measuring the lift as Darren suggested there's really no sure way to tell what cam is in the car without pulling it out. I'm not even sure a Mass Air eec would let the engine run without there being an M/A meter in place... Quote Selected
Mass Airflow? Update! Reply #3 – June 29, 2012, 02:19:54 PM Quote from: ThunderbirdSport302;393443If you've got a very hairy cam, and/or bigger injectors, you could very well get the results you have. Give us a little background on the HO swap? What injectors are in the engine? What eec? Any visible mods? Short of measuring the lift as Darren suggested there's really no sure way to tell what cam is in the car without pulling it out. I'm not even sure a Mass Air eec would let the engine run without there being an M/A meter in place...The HO is a re-man out of a 89 Mustang. I was told there were very few miles on it since install. All appears to be factory including the injectors. Did not pull the numbers off of EEC. I believe it to be factory 89 Mustang. The rest of the Mustang was nothing but a rolling modification. A lot of the modifications were just not thought out well. I would not put it past them to up the cam with no regard at to what else it would need. I just thought, if it had much of a cam at all MAF may be required. MAF is more adaptable to modifications. I just wondered if it has much cam at all, would I need MAF. I plan on replacing most all of the sensors. They could be factory 89 parts. After this, and if there are no strange codes, I can pretty much assume the cam is bigger. Other than the smoke, it runs way to good for there to be any major problems. Quote Selected
Mass Airflow? Update! Reply #4 – June 29, 2012, 02:31:12 PM Well in 1989 mustang got MAF put in them. Before that was speed density. So if you have a computer from 1989 without a MAF meter, that may be your problem. Quote Selected
Mass Airflow? Update! Reply #5 – June 29, 2012, 02:33:11 PM And if you are running a speed density computer, any mods past a cold air intake and some exhaust work, your car will actually start getting slower and will not run as good. Quote Selected
Mass Airflow? Update! Reply #6 – June 29, 2012, 05:15:47 PM A mass air car will run without the MAF plugged in. Check over by the passenger strut tower and see if there is a connector for an MAF.Darren Quote Selected
Mass Airflow? Update! Reply #7 – June 30, 2012, 12:58:22 PM Looks like I have some investigation to do. I will look for an unused connector. This could possibly be a Mustang that is not an 89. Plates were ran and it is not stolen. VIN on dash is missing. Driver door has been replaced. I have no paperwork on the car whatsoever. No title and no registration. Thanks everyone for your help. I should have a driveable car soon! Quote Selected
Mass Airflow? Update! Reply #8 – June 30, 2012, 03:12:17 PM A sd car doesn't get slower with engine upgrades...The maf is a redundant check of air that requires several extra calculations before any a/f ratio is changed or o2 sensors are compared. The only thing that will make a sd car not run as well is not enough fuel, or a very lopy cam or different lope speration that an ad computer won't. Be able to compensate for.Sd is more efficient as well as having less restriction into your intake. The only reason to go maf is if the cam is unhappy and too big. Most stang alone computer systems are sd because they are so much easier to tune. Quote Selected
Mass Airflow? Update! Reply #10 – June 30, 2012, 04:13:30 PM Quote from: Haystack;393537A sd car doesn't get slower with engine upgrades...The maf is a redundant check of air that requires several extra calculations before any a/f ratio is changed or o2 sensors are compared. The only thing that will make a sd car not run as well is not enough fuel, or a very lopy cam or different lope speration that an ad computer won't. Be able to compensate for.Sd is more efficient as well as having less restriction into your intake. The only reason to go maf is if the cam is unhappy and too big. Most stang alone computer systems are sd because they are so much easier to tune. What he said. Plenty of guys run gigantic heads and even blowers on SD systems including the stock style Ford ones. Quote Selected
Mass Airflow? Update! Reply #11 – July 01, 2012, 12:08:05 PM I must get trans shifting correctly and exhaust right first. I plan on replacing all sensors. Possibly not nessesary, but I don't want that "old car sendrome" where something goes wrong weekly. I feel it will perform it's best with new sensors. Smoking problem may or may not be solved with that. Then, I will run and troubleshoot codes. Everybody seems to think a large cam will make it need MAF. I have not tested lift, but from the way it runs, I believe the cam is large. If the Mustang was a factory MAF car I will put on MAF regardless. If not, I will only put on MAF if needed by the cam. Quote Selected
Mass Airflow? Update! Reply #12 – July 01, 2012, 12:23:14 PM huh, I was told differently on this form 3 years ago.... Quote Selected
Mass Airflow? Update! Reply #13 – July 01, 2012, 01:24:19 PM If your map sensor fails, it will shoot out black smoke. If you have a vacuum leak, the car will constantly idle up and down and even die. Same goes if your throttle bodyidle adjustment has been raised above what the iac can handle. Then the computer starts cutting timing to try to keep the idle down low enough.I would start out with codes. There's only about 6 wires that need to work to run a sd computer, plus fuel ijjectors. As long as about 2 sensors work, your car will run, and should get you home. Quote Selected
Mass Airflow? Update! Reply #14 – July 01, 2012, 01:31:04 PM Quote from: SR71blackbird;393587huh, I was told differently on this form 3 years ago....Which is something I may have even told you.Tom (not renzo, turbocoupe5.0or something like that. He doesn't hang out much anymore) Used to brag about getting into the 13's with a stock 1986 stang with just gears and tires. He then swapped to maf because of "how much more efficient it was" and lost over 3/10ths in the quarter mile. For the longest time, some cams would work fine on sd systems, some wouldn't, and it wasn't understood too well. Basically, if your vaccuum suffers at idle, it will run pig rich and the computer will try to speed up your idle untill it has enough vacuum as well as keep the idle low. Suposedly lobe seperation is a big enough differance for the computer to have a hard time compensating, but since hearing that, I've seen a lot of guys with large cams, and differant lobe seperation run fine as long as vacuum is above about 14 at idle. Quote Selected
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