Long story short my mass air was unpluged on my car and i didnt no it, so i started it or should i say tried to. Ran a little but ran like ----. When i realized i was unpluged i pluged it back in. Today its running and i drove it but the throttle doesnt seem krisp and it kinda sound like its got a little miss. Do you all think i may have fouled the pluges????????????
do you have a scaner, or know how to pull throuble codes? do you have any idea on how long it was unpluged?
I'm afraid I know very little about EFI. However, doesn't the computer have to "re-learn" some of the programming characteristics? In other words, would you simply have to do some driving under varying conditions to retrain it? Just shooting in the dark here, but I've heard some mention of that technique.
it is treating it as a new sensor, did a check engine light come on? If it did your car is running in emergency mode and you should reset it.
ford computers do learn but its really fast. it depends on the mass air meter to be accuratly calibrated to match the calibration of the computer. it does not learn the mass air meter. it learns the air fuel ratios when idleing and cruising to make corrections accross the board for the air ratio. my guess here is that some spark plugs got fowled out from not runnig right with the mass air disconnected.
I have no way to check codes, this is the motor out of the mustang i put in my comet. I did go out and pull a plug, it looked ok, so i unpluged the conputer to reset it and took it for a ride seems to be the same, deffinitlly got a miss maybe ill replace all the plugs anyways just to check.............
Pulled all plug wires off of ditributor left them on lose, started the motor and took off each wire to see if there was a change. The second cyl on the drivers side didnt make a change after i removed it. First i pulled plug and put a new one in no change still no difference. So i checked for fire on that wire i have fire. So im asumming no fuel from that injector. I drove the car then pulled the plug it looked still brand new...........
double check your wiring make sure everything is plugged in before you start spending money on new parts you might not need.
if it is clean as a whistle then no fuel......Tap on the injector.....sometimes just the pintle gets stuck..... Past that the injector is shorted out , or you have no signal to fire that injector.....which would be wiring or a bad ECM....having the Mass air flow sensor unplugged did not hurt anything. It went it to LIMP mode but as soon as you plugged it back in it knew to reset back to the learned settings..... You could pick up a set of fuel injector test noid lights for less than 20.00 bucks. You plug it in to the injector harness at the lead you feel is bad (#@ in this case) and it will flash on/off if it has a pulse.....
also to be sure you could always pull the injector rail and have somebody crank the engine over and watch the injectors fire!!!! You maybe surprised at how bad older injectors "inject" you should have a nice fine mist in a fan shaped pattern.... If the injector passes and you have spark at that cylinder it is low compression.....or valves are not actuating.....pull a valve cover and look and do a compression check!!!! but you would likely see unburned fuel on the plug!!! so......
thanks everyone for the help................talked to lance he said to check oms on injectors so i checked a good cyl and it was 17 checked the bad cyl and nothing........he found my problem. thanks a million
